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8ae0e4b4 KM |
1 | /* |
2 | * Copyright (c) 1982 Regents of the University of California. | |
3 | * All rights reserved. The Berkeley software License Agreement | |
4 | * specifies the terms and conditions for redistribution. | |
5 | * | |
6 | * @(#)ip.h 6.5 (Berkeley) %G% | |
7 | */ | |
6e8b2eca | 8 | |
dad64fdf BJ |
9 | /* |
10 | * Definitions for internet protocol version 4. | |
11 | * Per RFC 791, September 1981. | |
12 | */ | |
13 | #define IPVERSION 4 | |
14 | ||
15 | /* | |
16 | * Structure of an internet header, naked of options. | |
17 | * | |
53a5409e BJ |
18 | * We declare ip_len and ip_off to be short, rather than u_short |
19 | * pragmatically since otherwise unsigned comparisons can result | |
20 | * against negative integers quite easily, and fail in subtle ways. | |
dad64fdf | 21 | */ |
6e8b2eca | 22 | struct ip { |
498aff44 | 23 | #ifdef vax |
6e8b2eca BJ |
24 | u_char ip_hl:4, /* header length */ |
25 | ip_v:4; /* version */ | |
498aff44 | 26 | #endif |
6e8b2eca | 27 | u_char ip_tos; /* type of service */ |
82422b42 | 28 | short ip_len; /* total length */ |
6e8b2eca | 29 | u_short ip_id; /* identification */ |
82422b42 | 30 | short ip_off; /* fragment offset field */ |
dad64fdf BJ |
31 | #define IP_DF 0x4000 /* dont fragment flag */ |
32 | #define IP_MF 0x2000 /* more fragments flag */ | |
6e8b2eca BJ |
33 | u_char ip_ttl; /* time to live */ |
34 | u_char ip_p; /* protocol */ | |
35 | u_short ip_sum; /* checksum */ | |
2b4b57cd | 36 | struct in_addr ip_src,ip_dst; /* source and dest address */ |
0fcb2ae6 BJ |
37 | }; |
38 | ||
6e8b2eca | 39 | /* |
dad64fdf BJ |
40 | * Definitions for options. |
41 | */ | |
42 | #define IPOPT_COPIED(o) ((o)&0x80) | |
579b0a35 MK |
43 | #define IPOPT_CLASS(o) ((o)&0x60) |
44 | #define IPOPT_NUMBER(o) ((o)&0x1f) | |
dad64fdf BJ |
45 | |
46 | #define IPOPT_CONTROL 0x00 | |
579b0a35 MK |
47 | #define IPOPT_RESERVED1 0x20 |
48 | #define IPOPT_DEBMEAS 0x40 | |
49 | #define IPOPT_RESERVED2 0x60 | |
dad64fdf BJ |
50 | |
51 | #define IPOPT_EOL 0 /* end of option list */ | |
52 | #define IPOPT_NOP 1 /* no operation */ | |
53 | ||
54 | #define IPOPT_RR 7 /* record packet route */ | |
55 | #define IPOPT_TS 68 /* timestamp */ | |
56 | #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ | |
57 | #define IPOPT_LSRR 131 /* loose source route */ | |
58 | #define IPOPT_SATID 136 /* satnet id */ | |
59 | #define IPOPT_SSRR 137 /* strict source route */ | |
60 | ||
61 | /* | |
62 | * Time stamp option structure. | |
63 | */ | |
64 | struct ip_timestamp { | |
65 | u_char ipt_code; /* IPOPT_TS */ | |
66 | u_char ipt_len; /* size of structure (variable) */ | |
67 | u_char ipt_ptr; /* index of current entry */ | |
68 | u_char ipt_flg:4, /* flags, see below */ | |
69 | ipt_oflw:4; /* overflow counter */ | |
70 | union { | |
71 | n_long ipt_time[1]; | |
72 | struct ipt_ta { | |
2b4b57cd | 73 | struct in_addr ipt_addr; |
dad64fdf BJ |
74 | n_long ipt_time; |
75 | } ipt_ta[1]; | |
76 | } | |
77 | }; | |
78 | ||
79 | /* flag bits for ipt_flg */ | |
80 | #define IPOPT_TS_TSONLY 0 /* timestamps only */ | |
81 | #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ | |
82 | #define IPOPT_TS_PRESPEC 2 /* specified modules only */ | |
83 | ||
84 | /* bits for security (not byte swapped) */ | |
85 | #define IPOPT_SECUR_UNCLASS 0x0000 | |
86 | #define IPOPT_SECUR_CONFID 0xf135 | |
87 | #define IPOPT_SECUR_EFTO 0x789a | |
88 | #define IPOPT_SECUR_MMMM 0xbc4d | |
89 | #define IPOPT_SECUR_RESTR 0xaf13 | |
90 | #define IPOPT_SECUR_SECRET 0xd788 | |
91 | #define IPOPT_SECUR_TOPSECRET 0x6bc5 | |
92 | ||
dad64fdf BJ |
93 | /* |
94 | * Internet implementation parameters. | |
95 | */ | |
6e8b2eca | 96 | #define MAXTTL 255 /* maximum time to live (seconds) */ |
dad64fdf | 97 | #define IPFRAGTTL 15 /* time to live for frag chains */ |
b3caeaac | 98 | #define IPTTLDEC 1 /* subtracted when forwarding */ |
99578149 MK |
99 | |
100 | #define IP_MSS 576 /* default maximum segment size */ |