Commit | Line | Data |
---|---|---|
39674d5f | 1 | /* ip_icmp.h 4.5 82/04/25 */ |
9fc9afc2 BJ |
2 | |
3 | /* | |
4 | * Interface Control Message Protocol Definitions. | |
5 | * Per RFC 792, September 1981. | |
6 | */ | |
7 | ||
8 | /* | |
9 | * Structure of an icmp header. | |
10 | */ | |
11 | struct icmp { | |
12 | u_char icmp_type; /* type of message, see below */ | |
13 | u_char icmp_code; /* type sub code */ | |
14 | u_short icmp_cksum; /* ones complement cksum of struct */ | |
15 | union { | |
16 | u_char ih_pptr; /* ICMP_PARAMPROB */ | |
2b4b57cd | 17 | struct in_addr ih_gwaddr; /* ICMP_REDIRECT */ |
9fc9afc2 BJ |
18 | struct ih_idseq { |
19 | n_short icd_id; | |
20 | n_short icd_seq; | |
21 | } ih_idseq; | |
72e4f44e | 22 | int ih_void; |
9fc9afc2 BJ |
23 | } icmp_hun; |
24 | #define icmp_pptr icmp_hun.ih_pptr | |
25 | #define icmp_gwaddr icmp_hun.ih_gwaddr | |
26 | #define icmp_id icmp_hun.ih_idseq.icd_id | |
27 | #define icmp_seq icmp_hun.ih_idseq.icd_seq | |
72e4f44e | 28 | #define icmp_void icmp_hun.ih_void |
9fc9afc2 BJ |
29 | union { |
30 | struct id_ts { | |
31 | n_time its_otime; | |
32 | n_time its_rtime; | |
33 | n_time its_ttime; | |
34 | } id_ts; | |
35 | struct id_ip { | |
36 | struct ip idi_ip; | |
37 | /* options and then 64 bits of data */ | |
38 | } id_ip; | |
39 | } icmp_dun; | |
40 | #define icmp_otime icmp_dun.id_ts.its_otime | |
41 | #define icmp_rtime icmp_dun.id_ts.its_rtime | |
42 | #define icmp_ttime icmp_dun.id_ts.its_ttime | |
43 | #define icmp_ip icmp_dun.id_ip.idi_ip | |
44 | }; | |
45 | ||
46 | /* | |
47 | * Lower bounds on packet lengths for various types. | |
48 | * For the error advice packets must first insure that the | |
49 | * packet is large enought to contain the returned ip header. | |
50 | * Only then can we do the check to see if 64 bits of packet | |
51 | * data have been returned, since we need to check the returned | |
52 | * ip header length. | |
53 | */ | |
54 | #define ICMP_MINLEN 8 /* abs minimum */ | |
55 | #define ICMP_TSLEN (8 + 3 * sizeof (n_time)) /* timestamp */ | |
56 | #define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */ | |
39674d5f | 57 | #define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8) |
9fc9afc2 BJ |
58 | /* N.B.: must separately check that ip_hl >= 5 */ |
59 | ||
60 | /* | |
61 | * Definition of type and code field values. | |
62 | */ | |
63 | #define ICMP_ECHOREPLY 0 /* echo reply */ | |
64 | #define ICMP_UNREACH 3 /* dest unreachable, codes: */ | |
65 | #define ICMP_UNREACH_NET 0 /* bad net */ | |
66 | #define ICMP_UNREACH_HOST 1 /* bad host */ | |
67 | #define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */ | |
68 | #define ICMP_UNREACH_PORT 3 /* bad port */ | |
69 | #define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */ | |
70 | #define ICMP_UNREACH_SRCFAIL 5 /* src route failed */ | |
71 | #define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */ | |
72 | #define ICMP_REDIRECT 5 /* shorter route, codes: */ | |
73 | #define ICMP_REDIRECT_NET 0 /* for network */ | |
74 | #define ICMP_REDIRECT_HOST 1 /* for host */ | |
75 | #define ICMP_REDIRECT_TOSNET 2 /* for tos and net */ | |
76 | #define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */ | |
77 | #define ICMP_ECHO 8 /* echo service */ | |
78 | #define ICMP_TIMXCEED 11 /* time exceeded, code: */ | |
79 | #define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */ | |
80 | #define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */ | |
b454c3ea | 81 | #define ICMP_PARAMPROB 12 /* ip header bad */ |
9fc9afc2 BJ |
82 | #define ICMP_TSTAMP 13 /* timestamp request */ |
83 | #define ICMP_TSTAMPREPLY 14 /* timestamp reply */ | |
84 | #define ICMP_IREQ 15 /* information request */ | |
85 | #define ICMP_IREQREPLY 16 /* information reply */ |