Commit | Line | Data |
---|---|---|
2b4b57cd | 1 | /* ip.h 1.9 81/11/18 */ |
6e8b2eca | 2 | |
dad64fdf BJ |
3 | /* |
4 | * Definitions for internet protocol version 4. | |
5 | * Per RFC 791, September 1981. | |
6 | */ | |
7 | #define IPVERSION 4 | |
8 | ||
9 | /* | |
10 | * Structure of an internet header, naked of options. | |
11 | * | |
53a5409e BJ |
12 | * We declare ip_len and ip_off to be short, rather than u_short |
13 | * pragmatically since otherwise unsigned comparisons can result | |
14 | * against negative integers quite easily, and fail in subtle ways. | |
dad64fdf | 15 | */ |
6e8b2eca BJ |
16 | struct ip { |
17 | u_char ip_hl:4, /* header length */ | |
18 | ip_v:4; /* version */ | |
19 | u_char ip_tos; /* type of service */ | |
82422b42 | 20 | short ip_len; /* total length */ |
6e8b2eca | 21 | u_short ip_id; /* identification */ |
82422b42 | 22 | short ip_off; /* fragment offset field */ |
dad64fdf BJ |
23 | #define IP_DF 0x4000 /* dont fragment flag */ |
24 | #define IP_MF 0x2000 /* more fragments flag */ | |
6e8b2eca BJ |
25 | u_char ip_ttl; /* time to live */ |
26 | u_char ip_p; /* protocol */ | |
27 | u_short ip_sum; /* checksum */ | |
2b4b57cd | 28 | struct in_addr ip_src,ip_dst; /* source and dest address */ |
0fcb2ae6 BJ |
29 | }; |
30 | ||
6e8b2eca | 31 | /* |
dad64fdf BJ |
32 | * Definitions for options. |
33 | */ | |
34 | #define IPOPT_COPIED(o) ((o)&0x80) | |
35 | #define IPOPT_CLASS(o) ((o)&0x40) | |
36 | #define IPOPT_NUMBER(o) ((o)&0x3f) | |
37 | ||
38 | #define IPOPT_CONTROL 0x00 | |
39 | #define IPOPT_RESERVED1 0x10 | |
40 | #define IPOPT_DEBMEAS 0x20 | |
41 | #define IPOPT_RESERVED2 0x30 | |
42 | ||
43 | #define IPOPT_EOL 0 /* end of option list */ | |
44 | #define IPOPT_NOP 1 /* no operation */ | |
45 | ||
46 | #define IPOPT_RR 7 /* record packet route */ | |
47 | #define IPOPT_TS 68 /* timestamp */ | |
48 | #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ | |
49 | #define IPOPT_LSRR 131 /* loose source route */ | |
50 | #define IPOPT_SATID 136 /* satnet id */ | |
51 | #define IPOPT_SSRR 137 /* strict source route */ | |
52 | ||
53 | /* | |
54 | * Time stamp option structure. | |
55 | */ | |
56 | struct ip_timestamp { | |
57 | u_char ipt_code; /* IPOPT_TS */ | |
58 | u_char ipt_len; /* size of structure (variable) */ | |
59 | u_char ipt_ptr; /* index of current entry */ | |
60 | u_char ipt_flg:4, /* flags, see below */ | |
61 | ipt_oflw:4; /* overflow counter */ | |
62 | union { | |
63 | n_long ipt_time[1]; | |
64 | struct ipt_ta { | |
2b4b57cd | 65 | struct in_addr ipt_addr; |
dad64fdf BJ |
66 | n_long ipt_time; |
67 | } ipt_ta[1]; | |
68 | } | |
69 | }; | |
70 | ||
71 | /* flag bits for ipt_flg */ | |
72 | #define IPOPT_TS_TSONLY 0 /* timestamps only */ | |
73 | #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ | |
74 | #define IPOPT_TS_PRESPEC 2 /* specified modules only */ | |
75 | ||
76 | /* bits for security (not byte swapped) */ | |
77 | #define IPOPT_SECUR_UNCLASS 0x0000 | |
78 | #define IPOPT_SECUR_CONFID 0xf135 | |
79 | #define IPOPT_SECUR_EFTO 0x789a | |
80 | #define IPOPT_SECUR_MMMM 0xbc4d | |
81 | #define IPOPT_SECUR_RESTR 0xaf13 | |
82 | #define IPOPT_SECUR_SECRET 0xd788 | |
83 | #define IPOPT_SECUR_TOPSECRET 0x6bc5 | |
84 | ||
dad64fdf BJ |
85 | /* |
86 | * Internet implementation parameters. | |
87 | */ | |
6e8b2eca | 88 | #define MAXTTL 255 /* maximum time to live (seconds) */ |
dad64fdf | 89 | #define IPFRAGTTL 15 /* time to live for frag chains */ |