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1.1 root 1: /* ip.h 6.1 83/07/29 */
2:
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: *
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.
15: */
16: struct ip {
17: #ifdef vax
18: u_char ip_hl:4, /* header length */
19: ip_v:4; /* version */
20: #endif
21: #ifdef mc68000
22: u_char ip_v:4, /* version */
23: ip_hl:4; /* header length */
24: #endif
25: u_char ip_tos; /* type of service */
26: short ip_len; /* total length */
27: u_short ip_id; /* identification */
28: short ip_off; /* fragment offset field */
29: #define IP_DF 0x4000 /* dont fragment flag */
30: #define IP_MF 0x2000 /* more fragments flag */
31: u_char ip_ttl; /* time to live */
32: u_char ip_p; /* protocol */
33: u_short ip_sum; /* checksum */
34: u_long ip_src,ip_dst; /* source and dest address */
35: };
36:
37: /*
38: * Definitions for options.
39: */
40: #define IPOPT_COPIED(o) ((o)&0x80)
41: #define IPOPT_CLASS(o) ((o)&0x40)
42: #define IPOPT_NUMBER(o) ((o)&0x3f)
43:
44: #define IPOPT_CONTROL 0x00
45: #define IPOPT_RESERVED1 0x10
46: #define IPOPT_DEBMEAS 0x20
47: #define IPOPT_RESERVED2 0x30
48:
49: #define IPOPT_EOL 0 /* end of option list */
50: #define IPOPT_NOP 1 /* no operation */
51:
52: #define IPOPT_RR 7 /* record packet route */
53: #define IPOPT_TS 68 /* timestamp */
54: #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
55: #define IPOPT_LSRR 131 /* loose source route */
56: #define IPOPT_SATID 136 /* satnet id */
57: #define IPOPT_SSRR 137 /* strict source route */
58:
59: /*
60: * Time stamp option structure.
61: */
62: struct ip_timestamp {
63: u_char ipt_code; /* IPOPT_TS */
64: u_char ipt_len; /* size of structure (variable) */
65: u_char ipt_ptr; /* index of current entry */
66: u_char ipt_flg:4, /* flags, see below */
67: ipt_oflw:4; /* overflow counter */
68: union {
69: u_long ipt_time[1];
70: struct ipt_ta {
71: u_long ipt_addr;
72: u_long ipt_time;
73: } ipt_ta[1];
74: }
75: };
76:
77: /* flag bits for ipt_flg */
78: #define IPOPT_TS_TSONLY 0 /* timestamps only */
79: #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
80: #define IPOPT_TS_PRESPEC 2 /* specified modules only */
81:
82: /* bits for security (not byte swapped) */
83: #define IPOPT_SECUR_UNCLASS 0x0000
84: #define IPOPT_SECUR_CONFID 0xf135
85: #define IPOPT_SECUR_EFTO 0x789a
86: #define IPOPT_SECUR_MMMM 0xbc4d
87: #define IPOPT_SECUR_RESTR 0xaf13
88: #define IPOPT_SECUR_SECRET 0xd788
89: #define IPOPT_SECUR_TOPSECRET 0x6bc5
90:
91: /*
92: * Internet implementation parameters.
93: */
94: #define MAXTTL 255 /* maximum time to live (seconds) */
95: #define IPFRAGTTL 15 /* time to live for frag chains */
96: #define IPTTLDEC 5 /* subtracted when forwarding */
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