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8ae0e4b4 | 1 | /* |
0880b18e | 2 | * Copyright (c) 1982, 1986 Regents of the University of California. |
2b6b6284 | 3 | * All rights reserved. |
8ae0e4b4 | 4 | * |
2b6b6284 | 5 | * Redistribution and use in source and binary forms are permitted |
616d42db KB |
6 | * provided that the above copyright notice and this paragraph are |
7 | * duplicated in all such forms and that any documentation, | |
8 | * advertising materials, and other materials related to such | |
9 | * distribution and use acknowledge that the software was developed | |
10 | * by the University of California, Berkeley. The name of the | |
11 | * University may not be used to endorse or promote products derived | |
12 | * from this software without specific prior written permission. | |
13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
15 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
2b6b6284 | 16 | * |
616d42db | 17 | * @(#)ip_icmp.h 7.4 (Berkeley) %G% |
8ae0e4b4 | 18 | */ |
9fc9afc2 BJ |
19 | |
20 | /* | |
21 | * Interface Control Message Protocol Definitions. | |
22 | * Per RFC 792, September 1981. | |
23 | */ | |
24 | ||
25 | /* | |
26 | * Structure of an icmp header. | |
27 | */ | |
28 | struct icmp { | |
29 | u_char icmp_type; /* type of message, see below */ | |
30 | u_char icmp_code; /* type sub code */ | |
31 | u_short icmp_cksum; /* ones complement cksum of struct */ | |
32 | union { | |
33 | u_char ih_pptr; /* ICMP_PARAMPROB */ | |
2b4b57cd | 34 | struct in_addr ih_gwaddr; /* ICMP_REDIRECT */ |
9fc9afc2 BJ |
35 | struct ih_idseq { |
36 | n_short icd_id; | |
37 | n_short icd_seq; | |
38 | } ih_idseq; | |
72e4f44e | 39 | int ih_void; |
9fc9afc2 BJ |
40 | } icmp_hun; |
41 | #define icmp_pptr icmp_hun.ih_pptr | |
42 | #define icmp_gwaddr icmp_hun.ih_gwaddr | |
43 | #define icmp_id icmp_hun.ih_idseq.icd_id | |
44 | #define icmp_seq icmp_hun.ih_idseq.icd_seq | |
72e4f44e | 45 | #define icmp_void icmp_hun.ih_void |
9fc9afc2 BJ |
46 | union { |
47 | struct id_ts { | |
48 | n_time its_otime; | |
49 | n_time its_rtime; | |
50 | n_time its_ttime; | |
51 | } id_ts; | |
52 | struct id_ip { | |
53 | struct ip idi_ip; | |
54 | /* options and then 64 bits of data */ | |
55 | } id_ip; | |
27b1d9f5 | 56 | u_long id_mask; |
676c9f56 | 57 | char id_data[1]; |
9fc9afc2 BJ |
58 | } icmp_dun; |
59 | #define icmp_otime icmp_dun.id_ts.its_otime | |
60 | #define icmp_rtime icmp_dun.id_ts.its_rtime | |
61 | #define icmp_ttime icmp_dun.id_ts.its_ttime | |
62 | #define icmp_ip icmp_dun.id_ip.idi_ip | |
27b1d9f5 | 63 | #define icmp_mask icmp_dun.id_mask |
676c9f56 | 64 | #define icmp_data icmp_dun.id_data |
9fc9afc2 BJ |
65 | }; |
66 | ||
67 | /* | |
68 | * Lower bounds on packet lengths for various types. | |
69 | * For the error advice packets must first insure that the | |
70 | * packet is large enought to contain the returned ip header. | |
71 | * Only then can we do the check to see if 64 bits of packet | |
72 | * data have been returned, since we need to check the returned | |
73 | * ip header length. | |
74 | */ | |
75 | #define ICMP_MINLEN 8 /* abs minimum */ | |
76 | #define ICMP_TSLEN (8 + 3 * sizeof (n_time)) /* timestamp */ | |
27b1d9f5 | 77 | #define ICMP_MASKLEN 12 /* address mask */ |
9fc9afc2 | 78 | #define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */ |
39674d5f | 79 | #define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8) |
9fc9afc2 BJ |
80 | /* N.B.: must separately check that ip_hl >= 5 */ |
81 | ||
82 | /* | |
83 | * Definition of type and code field values. | |
84 | */ | |
85 | #define ICMP_ECHOREPLY 0 /* echo reply */ | |
86 | #define ICMP_UNREACH 3 /* dest unreachable, codes: */ | |
87 | #define ICMP_UNREACH_NET 0 /* bad net */ | |
88 | #define ICMP_UNREACH_HOST 1 /* bad host */ | |
89 | #define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */ | |
90 | #define ICMP_UNREACH_PORT 3 /* bad port */ | |
91 | #define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */ | |
92 | #define ICMP_UNREACH_SRCFAIL 5 /* src route failed */ | |
93 | #define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */ | |
94 | #define ICMP_REDIRECT 5 /* shorter route, codes: */ | |
95 | #define ICMP_REDIRECT_NET 0 /* for network */ | |
96 | #define ICMP_REDIRECT_HOST 1 /* for host */ | |
97 | #define ICMP_REDIRECT_TOSNET 2 /* for tos and net */ | |
98 | #define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */ | |
99 | #define ICMP_ECHO 8 /* echo service */ | |
100 | #define ICMP_TIMXCEED 11 /* time exceeded, code: */ | |
101 | #define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */ | |
102 | #define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */ | |
b454c3ea | 103 | #define ICMP_PARAMPROB 12 /* ip header bad */ |
9fc9afc2 BJ |
104 | #define ICMP_TSTAMP 13 /* timestamp request */ |
105 | #define ICMP_TSTAMPREPLY 14 /* timestamp reply */ | |
106 | #define ICMP_IREQ 15 /* information request */ | |
107 | #define ICMP_IREQREPLY 16 /* information reply */ | |
27b1d9f5 MK |
108 | #define ICMP_MASKREQ 17 /* address mask request */ |
109 | #define ICMP_MASKREPLY 18 /* address mask reply */ | |
110 | ||
111 | #define ICMP_MAXTYPE 18 | |
f78fc6cc MK |
112 | |
113 | #define ICMP_INFOTYPE(type) \ | |
114 | ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \ | |
115 | (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \ | |
116 | (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \ | |
117 | (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY) |