3 * Portions Copyright (c) 1997-1999 Nokia Corporation and/or its subsidiary(-ies).
13 * Copyright (c) 1982, 1986 Regents of the University of California.
14 * All rights reserved.
16 * Redistribution and use in source and binary forms are permitted
17 * provided that this notice is preserved and that due credit is given
18 * to the University of California at Berkeley. The name of the University
19 * may not be used to endorse or promote products derived from this
20 * software without specific prior written permission. This software
21 * is provided ``as is'' without express or implied warranty.
25 * Interface Control Message Protocol Definitions.
26 * Per RFC 792, September 1981.
29 #ifndef _NETINET_IP_ICMP_H
30 #define _NETINET_IP_ICMP_H
37 Structure of an icmp header.
40 u_char icmp_type; /* type of message, see below */
41 u_char icmp_code; /* type sub code */
42 u_short icmp_cksum; /* ones complement cksum of struct */
44 u_char ih_pptr; /* ICMP_PARAMPROB */
45 struct in_addr ih_gwaddr; /* ICMP_REDIRECT */
52 #define icmp_pptr icmp_hun.ih_pptr
53 #define icmp_gwaddr icmp_hun.ih_gwaddr
54 #define icmp_id icmp_hun.ih_idseq.icd_id
55 #define icmp_seq icmp_hun.ih_idseq.icd_seq
56 #define icmp_void icmp_hun.ih_void
65 /* options and then 64 bits of data */
70 #define icmp_otime icmp_dun.id_ts.its_otime
71 #define icmp_rtime icmp_dun.id_ts.its_rtime
72 #define icmp_ttime icmp_dun.id_ts.its_ttime
73 #define icmp_ip icmp_dun.id_ip.idi_ip
74 #define icmp_mask icmp_dun.id_mask
75 #define icmp_data icmp_dun.id_data
79 Lower bounds on packet lengths for various types.
80 For the error advice packets must first insure that the
81 packet is large enought to contain the returned ip header.
82 Only then can we do the check to see if 64 bits of packet
83 data have been returned, since we need to check the returned
86 #define ICMP_MINLEN 8 /* abs minimum */
87 #define ICMP_TSLEN (8 + 3 * sizeof (n_time)) /* timestamp */
88 #define ICMP_MASKLEN 12 /* address mask */
89 #define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */
90 #define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8)
91 /* N.B.: must separately check that ip_hl >= 5 */
94 Definition of type and code field values.
96 #define ICMP_ECHOREPLY 0 /* echo reply */
97 #define ICMP_UNREACH 3 /* dest unreachable, codes: */
98 #define ICMP_UNREACH_NET 0 /* bad net */
99 #define ICMP_UNREACH_HOST 1 /* bad host */
100 #define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */
101 #define ICMP_UNREACH_PORT 3 /* bad port */
102 #define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */
103 #define ICMP_UNREACH_SRCFAIL 5 /* src route failed */
104 #define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */
105 #define ICMP_REDIRECT 5 /* shorter route, codes: */
106 #define ICMP_REDIRECT_NET 0 /* for network */
107 #define ICMP_REDIRECT_HOST 1 /* for host */
108 #define ICMP_REDIRECT_TOSNET 2 /* for tos and net */
109 #define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */
110 #define ICMP_ECHO 8 /* echo service */
111 #define ICMP_TIMXCEED 11 /* time exceeded, code: */
112 #define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */
113 #define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */
114 #define ICMP_PARAMPROB 12 /* ip header bad */
115 #define ICMP_TSTAMP 13 /* timestamp request */
116 #define ICMP_TSTAMPREPLY 14 /* timestamp reply */
117 #define ICMP_IREQ 15 /* information request */
118 #define ICMP_IREQREPLY 16 /* information reply */
119 #define ICMP_MASKREQ 17 /* address mask request */
120 #define ICMP_MASKREPLY 18 /* address mask reply */
121 #define ICMP_MAXTYPE 18
123 #define ICMP_INFOTYPE(type) \
124 ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
125 (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
126 (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
127 (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
133 #endif /* _NETINET_IP_ICMP_H */