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