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