1 /*
2  * INET		An implementation of the TCP/IP protocol suite for the LINUX
3  *		operating system.  INET is implemented using the  BSD Socket
4  *		interface as the means of communication with the user level.
5  *
6  *		Definitions for the ICMP protocol.
7  *
8  * Version:	@(#)icmp.h	1.0.3	04/28/93
9  *
10  * Author:	Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
11  *
12  *		This program is free software; you can redistribute it and/or
13  *		modify it under the terms of the GNU General Public License
14  *		as published by the Free Software Foundation; either version
15  *		2 of the License, or (at your option) any later version.
16  */
17 #ifndef _LINUX_ICMP_H
18 #define	_LINUX_ICMP_H
19 
20 #include <linux/types.h>
21 
22 #define ICMP_ECHOREPLY		0	/* Echo Reply			*/
23 #define ICMP_DEST_UNREACH	3	/* Destination Unreachable	*/
24 #define ICMP_SOURCE_QUENCH	4	/* Source Quench		*/
25 #define ICMP_REDIRECT		5	/* Redirect (change route)	*/
26 #define ICMP_ECHO		8	/* Echo Request			*/
27 #define ICMP_TIME_EXCEEDED	11	/* Time Exceeded		*/
28 #define ICMP_PARAMETERPROB	12	/* Parameter Problem		*/
29 #define ICMP_TIMESTAMP		13	/* Timestamp Request		*/
30 #define ICMP_TIMESTAMPREPLY	14	/* Timestamp Reply		*/
31 #define ICMP_INFO_REQUEST	15	/* Information Request		*/
32 #define ICMP_INFO_REPLY		16	/* Information Reply		*/
33 #define ICMP_ADDRESS		17	/* Address Mask Request		*/
34 #define ICMP_ADDRESSREPLY	18	/* Address Mask Reply		*/
35 #define NR_ICMP_TYPES		18
36 
37 
38 /* Codes for UNREACH. */
39 #define ICMP_NET_UNREACH	0	/* Network Unreachable		*/
40 #define ICMP_HOST_UNREACH	1	/* Host Unreachable		*/
41 #define ICMP_PROT_UNREACH	2	/* Protocol Unreachable		*/
42 #define ICMP_PORT_UNREACH	3	/* Port Unreachable		*/
43 #define ICMP_FRAG_NEEDED	4	/* Fragmentation Needed/DF set	*/
44 #define ICMP_SR_FAILED		5	/* Source Route failed		*/
45 #define ICMP_NET_UNKNOWN	6
46 #define ICMP_HOST_UNKNOWN	7
47 #define ICMP_HOST_ISOLATED	8
48 #define ICMP_NET_ANO		9
49 #define ICMP_HOST_ANO		10
50 #define ICMP_NET_UNR_TOS	11
51 #define ICMP_HOST_UNR_TOS	12
52 #define ICMP_PKT_FILTERED	13	/* Packet filtered */
53 #define ICMP_PREC_VIOLATION	14	/* Precedence violation */
54 #define ICMP_PREC_CUTOFF	15	/* Precedence cut off */
55 #define NR_ICMP_UNREACH		15	/* instead of hardcoding immediate value */
56 
57 /* Codes for REDIRECT. */
58 #define ICMP_REDIR_NET		0	/* Redirect Net			*/
59 #define ICMP_REDIR_HOST		1	/* Redirect Host		*/
60 #define ICMP_REDIR_NETTOS	2	/* Redirect Net for TOS		*/
61 #define ICMP_REDIR_HOSTTOS	3	/* Redirect Host for TOS	*/
62 
63 /* Codes for TIME_EXCEEDED. */
64 #define ICMP_EXC_TTL		0	/* TTL count exceeded		*/
65 #define ICMP_EXC_FRAGTIME	1	/* Fragment Reass time exceeded	*/
66 
67 
68 struct icmphdr {
69   __u8		type;
70   __u8		code;
71   __sum16	checksum;
72   union {
73 	struct {
74 		__be16	id;
75 		__be16	sequence;
76 	} echo;
77 	__be32	gateway;
78 	struct {
79 		__be16	__unused;
80 		__be16	mtu;
81 	} frag;
82   } un;
83 };
84 
85 #ifdef __KERNEL__
86 #include <linux/skbuff.h>
87 
icmp_hdr(const struct sk_buff * skb)88 static inline struct icmphdr *icmp_hdr(const struct sk_buff *skb)
89 {
90 	return (struct icmphdr *)skb_transport_header(skb);
91 }
92 #endif
93 
94 /*
95  *	constants for (set|get)sockopt
96  */
97 
98 #define ICMP_FILTER			1
99 
100 struct icmp_filter {
101 	__u32		data;
102 };
103 
104 
105 #endif	/* _LINUX_ICMP_H */
106