Commit | Line | Data |
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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 KB |
5 | * Redistribution and use in source and binary forms are permitted |
6 | * provided that this notice is preserved and that due credit is given | |
7 | * to the University of California at Berkeley. The name of the University | |
8 | * may not be used to endorse or promote products derived from this | |
9 | * software without specific prior written permission. This software | |
10 | * is provided ``as is'' without express or implied warranty. | |
11 | * | |
233ed7a5 | 12 | * @(#)ip.h 7.6.1.1 (Berkeley) %G% |
8ae0e4b4 | 13 | */ |
233ed7a5 MK |
14 | #ifndef BYTE_ORDER |
15 | /* | |
16 | * Definitions for byte order, | |
17 | * according to byte significance from low address to high. | |
18 | */ | |
19 | #define LITTLE_ENDIAN 1234 /* least-significant byte first (vax) */ | |
20 | #define BIG_ENDIAN 4321 /* most-significant byte first (IBM, net) */ | |
21 | #define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long (pdp) */ | |
22 | ||
23 | #ifdef vax | |
24 | #define BYTE_ORDER LITTLE_ENDIAN | |
25 | #else | |
26 | #define BYTE_ORDER BIG_ENDIAN /* mc68000, tahoe, most others */ | |
27 | #endif | |
28 | #endif BYTE_ORDER | |
6e8b2eca | 29 | |
dad64fdf BJ |
30 | /* |
31 | * Definitions for internet protocol version 4. | |
32 | * Per RFC 791, September 1981. | |
33 | */ | |
34 | #define IPVERSION 4 | |
35 | ||
36 | /* | |
37 | * Structure of an internet header, naked of options. | |
38 | * | |
53a5409e BJ |
39 | * We declare ip_len and ip_off to be short, rather than u_short |
40 | * pragmatically since otherwise unsigned comparisons can result | |
41 | * against negative integers quite easily, and fail in subtle ways. | |
dad64fdf | 42 | */ |
6e8b2eca | 43 | struct ip { |
f8b9a4f5 | 44 | #if BYTE_ORDER == LITTLE_ENDIAN |
6e8b2eca BJ |
45 | u_char ip_hl:4, /* header length */ |
46 | ip_v:4; /* version */ | |
f112c673 | 47 | #endif |
f8b9a4f5 | 48 | #if BYTE_ORDER == BIG_ENDIAN |
f112c673 MK |
49 | u_char ip_v:4, /* version */ |
50 | ip_hl:4; /* header length */ | |
498aff44 | 51 | #endif |
6e8b2eca | 52 | u_char ip_tos; /* type of service */ |
82422b42 | 53 | short ip_len; /* total length */ |
6e8b2eca | 54 | u_short ip_id; /* identification */ |
82422b42 | 55 | short ip_off; /* fragment offset field */ |
dad64fdf BJ |
56 | #define IP_DF 0x4000 /* dont fragment flag */ |
57 | #define IP_MF 0x2000 /* more fragments flag */ | |
6e8b2eca BJ |
58 | u_char ip_ttl; /* time to live */ |
59 | u_char ip_p; /* protocol */ | |
60 | u_short ip_sum; /* checksum */ | |
2b4b57cd | 61 | struct in_addr ip_src,ip_dst; /* source and dest address */ |
0fcb2ae6 BJ |
62 | }; |
63 | ||
9d059868 MK |
64 | #define IP_MAXPACKET 65535 /* maximum packet size */ |
65 | ||
6e8b2eca | 66 | /* |
dad64fdf BJ |
67 | * Definitions for options. |
68 | */ | |
69 | #define IPOPT_COPIED(o) ((o)&0x80) | |
579b0a35 MK |
70 | #define IPOPT_CLASS(o) ((o)&0x60) |
71 | #define IPOPT_NUMBER(o) ((o)&0x1f) | |
dad64fdf BJ |
72 | |
73 | #define IPOPT_CONTROL 0x00 | |
579b0a35 MK |
74 | #define IPOPT_RESERVED1 0x20 |
75 | #define IPOPT_DEBMEAS 0x40 | |
76 | #define IPOPT_RESERVED2 0x60 | |
dad64fdf BJ |
77 | |
78 | #define IPOPT_EOL 0 /* end of option list */ | |
79 | #define IPOPT_NOP 1 /* no operation */ | |
80 | ||
81 | #define IPOPT_RR 7 /* record packet route */ | |
82 | #define IPOPT_TS 68 /* timestamp */ | |
83 | #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ | |
84 | #define IPOPT_LSRR 131 /* loose source route */ | |
85 | #define IPOPT_SATID 136 /* satnet id */ | |
86 | #define IPOPT_SSRR 137 /* strict source route */ | |
87 | ||
f52643db MK |
88 | /* |
89 | * Offsets to fields in options other than EOL and NOP. | |
90 | */ | |
91 | #define IPOPT_OPTVAL 0 /* option ID */ | |
92 | #define IPOPT_OLEN 1 /* option length */ | |
93 | #define IPOPT_OFFSET 2 /* offset within option */ | |
94 | #define IPOPT_MINOFF 4 /* min value of above */ | |
95 | ||
dad64fdf BJ |
96 | /* |
97 | * Time stamp option structure. | |
98 | */ | |
99 | struct ip_timestamp { | |
100 | u_char ipt_code; /* IPOPT_TS */ | |
101 | u_char ipt_len; /* size of structure (variable) */ | |
102 | u_char ipt_ptr; /* index of current entry */ | |
f8b9a4f5 | 103 | #if BYTE_ORDER == LITTLE_ENDIAN |
dad64fdf BJ |
104 | u_char ipt_flg:4, /* flags, see below */ |
105 | ipt_oflw:4; /* overflow counter */ | |
f112c673 | 106 | #endif |
f8b9a4f5 | 107 | #if BYTE_ORDER == BIG_ENDIAN |
f112c673 MK |
108 | u_char ipt_oflw:4, /* overflow counter */ |
109 | ipt_flg:4; /* flags, see below */ | |
110 | #endif | |
f8b9a4f5 | 111 | union ipt_timestamp { |
dad64fdf BJ |
112 | n_long ipt_time[1]; |
113 | struct ipt_ta { | |
2b4b57cd | 114 | struct in_addr ipt_addr; |
dad64fdf BJ |
115 | n_long ipt_time; |
116 | } ipt_ta[1]; | |
f8b9a4f5 | 117 | } ipt_timestamp; |
dad64fdf BJ |
118 | }; |
119 | ||
120 | /* flag bits for ipt_flg */ | |
121 | #define IPOPT_TS_TSONLY 0 /* timestamps only */ | |
122 | #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ | |
123 | #define IPOPT_TS_PRESPEC 2 /* specified modules only */ | |
124 | ||
125 | /* bits for security (not byte swapped) */ | |
126 | #define IPOPT_SECUR_UNCLASS 0x0000 | |
127 | #define IPOPT_SECUR_CONFID 0xf135 | |
128 | #define IPOPT_SECUR_EFTO 0x789a | |
129 | #define IPOPT_SECUR_MMMM 0xbc4d | |
130 | #define IPOPT_SECUR_RESTR 0xaf13 | |
131 | #define IPOPT_SECUR_SECRET 0xd788 | |
132 | #define IPOPT_SECUR_TOPSECRET 0x6bc5 | |
133 | ||
dad64fdf BJ |
134 | /* |
135 | * Internet implementation parameters. | |
136 | */ | |
6e8b2eca | 137 | #define MAXTTL 255 /* maximum time to live (seconds) */ |
e3138fb8 | 138 | #define IPFRAGTTL 60 /* time to live for frags, slowhz */ |
b3caeaac | 139 | #define IPTTLDEC 1 /* subtracted when forwarding */ |
99578149 MK |
140 | |
141 | #define IP_MSS 576 /* default maximum segment size */ |