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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 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 
23 #define ICMP_ECHOREPLY		0	/* Echo Reply			*/
24 #define ICMP_DEST_UNREACH	3	/* Destination Unreachable	*/
25 #define ICMP_SOURCE_QUENCH	4	/* Source Quench		*/
26 #define ICMP_REDIRECT		5	/* Redirect (change route)	*/
27 #define ICMP_ECHO		8	/* Echo Request			*/
28 #define ICMP_TIME_EXCEEDED	11	/* Time Exceeded		*/
29 #define ICMP_PARAMETERPROB	12	/* Parameter Problem		*/
30 #define ICMP_TIMESTAMP		13	/* Timestamp Request		*/
31 #define ICMP_TIMESTAMPREPLY	14	/* Timestamp Reply		*/
32 #define ICMP_INFO_REQUEST	15	/* Information Request		*/
33 #define ICMP_INFO_REPLY		16	/* Information Reply		*/
34 #define ICMP_ADDRESS		17	/* Address Mask Request		*/
35 #define ICMP_ADDRESSREPLY	18	/* Address Mask Reply		*/
36 #define NR_ICMP_TYPES		18
37 
38 
39 /* Codes for UNREACH. */
40 #define ICMP_NET_UNREACH	0	/* Network Unreachable		*/
41 #define ICMP_HOST_UNREACH	1	/* Host Unreachable		*/
42 #define ICMP_PROT_UNREACH	2	/* Protocol Unreachable		*/
43 #define ICMP_PORT_UNREACH	3	/* Port Unreachable		*/
44 #define ICMP_FRAG_NEEDED	4	/* Fragmentation Needed/DF set	*/
45 #define ICMP_SR_FAILED		5	/* Source Route failed		*/
46 #define ICMP_NET_UNKNOWN	6
47 #define ICMP_HOST_UNKNOWN	7
48 #define ICMP_HOST_ISOLATED	8
49 #define ICMP_NET_ANO		9
50 #define ICMP_HOST_ANO		10
51 #define ICMP_NET_UNR_TOS	11
52 #define ICMP_HOST_UNR_TOS	12
53 #define ICMP_PKT_FILTERED	13	/* Packet filtered */
54 #define ICMP_PREC_VIOLATION	14	/* Precedence violation */
55 #define ICMP_PREC_CUTOFF	15	/* Precedence cut off */
56 #define NR_ICMP_UNREACH		15	/* instead of hardcoding immediate value */
57 
58 /* Codes for REDIRECT. */
59 #define ICMP_REDIR_NET		0	/* Redirect Net			*/
60 #define ICMP_REDIR_HOST		1	/* Redirect Host		*/
61 #define ICMP_REDIR_NETTOS	2	/* Redirect Net for TOS		*/
62 #define ICMP_REDIR_HOSTTOS	3	/* Redirect Host for TOS	*/
63 
64 /* Codes for TIME_EXCEEDED. */
65 #define ICMP_EXC_TTL		0	/* TTL count exceeded		*/
66 #define ICMP_EXC_FRAGTIME	1	/* Fragment Reass time exceeded	*/
67 
68 
69 struct icmphdr {
70   __u8		type;
71   __u8		code;
72   __sum16	checksum;
73   union {
74 	struct {
75 		__be16	id;
76 		__be16	sequence;
77 	} echo;
78 	__be32	gateway;
79 	struct {
80 		__be16	__unused;
81 		__be16	mtu;
82 	} frag;
83 	__u8	reserved[4];
84   } un;
85 };
86 
87 
88 /*
89  *	constants for (set|get)sockopt
90  */
91 
92 #define ICMP_FILTER			1
93 
94 struct icmp_filter {
95 	__u32		data;
96 };
97 
98 
99 #endif /* _UAPI_LINUX_ICMP_H */
100