projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 8ae0e4b4 | 1 | /* |
| 0880b18e | 2 | * Copyright (c) 1982, 1986 Regents of the University of California. |
| 8ae0e4b4 KM |
3 | * All rights reserved. The Berkeley software License Agreement |
| 4 | * specifies the terms and conditions for redistribution. | |
| 5 | * | |
| 0880b18e | 6 | * @(#)ip.h 7.1 (Berkeley) %G% |
| 8ae0e4b4 | 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 | ||
| f52643db MK |
61 | /* |
| 62 | * Offsets to fields in options other than EOL and NOP. | |
| 63 | */ | |
| 64 | #define IPOPT_OPTVAL 0 /* option ID */ | |
| 65 | #define IPOPT_OLEN 1 /* option length */ | |
| 66 | #define IPOPT_OFFSET 2 /* offset within option */ | |
| 67 | #define IPOPT_MINOFF 4 /* min value of above */ | |
| 68 | ||
| dad64fdf BJ |
69 | /* |
| 70 | * Time stamp option structure. | |
| 71 | */ | |
| 72 | struct ip_timestamp { | |
| 73 | u_char ipt_code; /* IPOPT_TS */ | |
| 74 | u_char ipt_len; /* size of structure (variable) */ | |
| 75 | u_char ipt_ptr; /* index of current entry */ | |
| 76 | u_char ipt_flg:4, /* flags, see below */ | |
| 77 | ipt_oflw:4; /* overflow counter */ | |
| 78 | union { | |
| 79 | n_long ipt_time[1]; | |
| 80 | struct ipt_ta { | |
| 2b4b57cd | 81 | struct in_addr ipt_addr; |
| dad64fdf BJ |
82 | n_long ipt_time; |
| 83 | } ipt_ta[1]; | |
| 84 | } | |
| 85 | }; | |
| 86 | ||
| 87 | /* flag bits for ipt_flg */ | |
| 88 | #define IPOPT_TS_TSONLY 0 /* timestamps only */ | |
| 89 | #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ | |
| 90 | #define IPOPT_TS_PRESPEC 2 /* specified modules only */ | |
| 91 | ||
| 92 | /* bits for security (not byte swapped) */ | |
| 93 | #define IPOPT_SECUR_UNCLASS 0x0000 | |
| 94 | #define IPOPT_SECUR_CONFID 0xf135 | |
| 95 | #define IPOPT_SECUR_EFTO 0x789a | |
| 96 | #define IPOPT_SECUR_MMMM 0xbc4d | |
| 97 | #define IPOPT_SECUR_RESTR 0xaf13 | |
| 98 | #define IPOPT_SECUR_SECRET 0xd788 | |
| 99 | #define IPOPT_SECUR_TOPSECRET 0x6bc5 | |
| 100 | ||
| dad64fdf BJ |
101 | /* |
| 102 | * Internet implementation parameters. | |
| 103 | */ | |
| 6e8b2eca | 104 | #define MAXTTL 255 /* maximum time to live (seconds) */ |
| dad64fdf | 105 | #define IPFRAGTTL 15 /* time to live for frag chains */ |
| b3caeaac | 106 | #define IPTTLDEC 1 /* subtracted when forwarding */ |
| 99578149 MK |
107 | |
| 108 | #define IP_MSS 576 /* default maximum segment size */ |