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 #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		18
40 
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	6
50 #define ICMP_HOST_UNKNOWN	7
51 #define ICMP_HOST_ISOLATED	8
52 #define ICMP_NET_ANO		9
53 #define ICMP_HOST_ANO		10
54 #define ICMP_NET_UNR_TOS	11
55 #define ICMP_HOST_UNR_TOS	12
56 #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			42
73 #define ICMP_EXT_ECHOREPLY		43
74 #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	1
84 #define ICMP_EXT_ECHO_CTYPE_INDEX	2
85 #define ICMP_EXT_ECHO_CTYPE_ADDR	3
86 #define ICMP_AFI_IP			1	/* Address Family Identifier for ipv4 */
87 #define ICMP_AFI_IP6			2	/* Address Family Identifier for ipv6 */
88 
89 struct 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)sockopt
110  */
111 
112 #define ICMP_FILTER			1
113 
114 struct icmp_filter {
115 	__u32		data;
116 };
117 
118 /* RFC 4884 extension struct: one per message */
119 struct 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 #else
127 #error	"Please fix <asm/byteorder.h>"
128 #endif
129 	__u8		reserved2;
130 	__sum16		checksum;
131 };
132 
133 /* RFC 4884 extension object header: one for each object */
134 struct 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 */
141 struct icmp_ext_echo_ctype3_hdr {
142 	__be16		afi;
143 	__u8		addrlen;
144 	__u8		reserved;
145 };
146 
147 /* RFC 8335: 2.1 Interface Identification Object */
148 struct 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