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1.1 root 1: /*
2: * Copyright (c) 1982, 1986 Regents of the University of California.
3: * All rights reserved.
4: *
5: * Redistribution is only permitted until one year after the first shipment
6: * of 4.4BSD by the Regents. Otherwise, redistribution and use in source and
7: * binary forms are permitted provided that: (1) source distributions retain
8: * this entire copyright notice and comment, and (2) distributions including
9: * binaries display the following acknowledgement: This product includes
10: * software developed by the University of California, Berkeley and its
11: * contributors'' in the documentation or other materials provided with the
12: * distribution and in all advertising materials mentioning features or use
13: * of this software. Neither the name of the University nor the names of
14: * its contributors may be used to endorse or promote products derived from
15: * this software without specific prior written permission.
16: * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
17: * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
18: * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
19: *
20: * @(#)ip.h 7.10 (Berkeley) 6/28/90
21: */
22:
23: /*
24: * Definitions for internet protocol version 4.
25: * Per RFC 791, September 1981.
26: */
27: #define IPVERSION 4
28:
29: /*
30: * Structure of an internet header, naked of options.
31: *
32: * We declare ip_len and ip_off to be short, rather than u_short
33: * pragmatically since otherwise unsigned comparisons can result
34: * against negative integers quite easily, and fail in subtle ways.
35: */
36: struct ip {
37: #if BYTE_ORDER == LITTLE_ENDIAN
38: u_char ip_hl:4, /* header length */
39: ip_v:4; /* version */
40: #endif
41: #if BYTE_ORDER == BIG_ENDIAN
42: u_char ip_v:4, /* version */
43: ip_hl:4; /* header length */
44: #endif
45: u_char ip_tos; /* type of service */
46: short ip_len; /* total length */
47: u_short ip_id; /* identification */
48: short ip_off; /* fragment offset field */
49: #define IP_DF 0x4000 /* dont fragment flag */
50: #define IP_MF 0x2000 /* more fragments flag */
51: u_char ip_ttl; /* time to live */
52: u_char ip_p; /* protocol */
53: u_short ip_sum; /* checksum */
54: struct in_addr ip_src,ip_dst; /* source and dest address */
55: };
56:
57: #define IP_MAXPACKET 65535 /* maximum packet size */
58:
59: /*
60: * Definitions for IP type of service (ip_tos)
61: */
62: #define IPTOS_LOWDELAY 0x10
63: #define IPTOS_THROUGHPUT 0x08
64: #define IPTOS_RELIABILITY 0x04
65:
66: /*
67: * Definitions for IP precedence (also in ip_tos) (hopefully unused)
68: */
69: #define IPTOS_PREC_NETCONTROL 0xe0
70: #define IPTOS_PREC_INTERNETCONTROL 0xc0
71: #define IPTOS_PREC_CRITIC_ECP 0xa0
72: #define IPTOS_PREC_FLASHOVERRIDE 0x80
73: #define IPTOS_PREC_FLASH 0x60
74: #define IPTOS_PREC_IMMEDIATE 0x40
75: #define IPTOS_PREC_PRIORITY 0x20
76: #define IPTOS_PREC_ROUTINE 0x10
77:
78: /*
79: * Definitions for options.
80: */
81: #define IPOPT_COPIED(o) ((o)&0x80)
82: #define IPOPT_CLASS(o) ((o)&0x60)
83: #define IPOPT_NUMBER(o) ((o)&0x1f)
84:
85: #define IPOPT_CONTROL 0x00
86: #define IPOPT_RESERVED1 0x20
87: #define IPOPT_DEBMEAS 0x40
88: #define IPOPT_RESERVED2 0x60
89:
90: #define IPOPT_EOL 0 /* end of option list */
91: #define IPOPT_NOP 1 /* no operation */
92:
93: #define IPOPT_RR 7 /* record packet route */
94: #define IPOPT_TS 68 /* timestamp */
95: #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
96: #define IPOPT_LSRR 131 /* loose source route */
97: #define IPOPT_SATID 136 /* satnet id */
98: #define IPOPT_SSRR 137 /* strict source route */
99:
100: /*
101: * Offsets to fields in options other than EOL and NOP.
102: */
103: #define IPOPT_OPTVAL 0 /* option ID */
104: #define IPOPT_OLEN 1 /* option length */
105: #define IPOPT_OFFSET 2 /* offset within option */
106: #define IPOPT_MINOFF 4 /* min value of above */
107:
108: /*
109: * Time stamp option structure.
110: */
111: struct ip_timestamp {
112: u_char ipt_code; /* IPOPT_TS */
113: u_char ipt_len; /* size of structure (variable) */
114: u_char ipt_ptr; /* index of current entry */
115: #if BYTE_ORDER == LITTLE_ENDIAN
116: u_char ipt_flg:4, /* flags, see below */
117: ipt_oflw:4; /* overflow counter */
118: #endif
119: #if BYTE_ORDER == BIG_ENDIAN
120: u_char ipt_oflw:4, /* overflow counter */
121: ipt_flg:4; /* flags, see below */
122: #endif
123: union ipt_timestamp {
124: n_long ipt_time[1];
125: struct ipt_ta {
126: struct in_addr ipt_addr;
127: n_long ipt_time;
128: } ipt_ta[1];
129: } ipt_timestamp;
130: };
131:
132: /* flag bits for ipt_flg */
133: #define IPOPT_TS_TSONLY 0 /* timestamps only */
134: #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
135: #define IPOPT_TS_PRESPEC 3 /* specified modules only */
136:
137: /* bits for security (not byte swapped) */
138: #define IPOPT_SECUR_UNCLASS 0x0000
139: #define IPOPT_SECUR_CONFID 0xf135
140: #define IPOPT_SECUR_EFTO 0x789a
141: #define IPOPT_SECUR_MMMM 0xbc4d
142: #define IPOPT_SECUR_RESTR 0xaf13
143: #define IPOPT_SECUR_SECRET 0xd788
144: #define IPOPT_SECUR_TOPSECRET 0x6bc5
145:
146: /*
147: * Internet implementation parameters.
148: */
149: #define MAXTTL 255 /* maximum time to live (seconds) */
150: #define IPFRAGTTL 60 /* time to live for frags, slowhz */
151: #define IPTTLDEC 1 /* subtracted when forwarding */
152:
153: #define IP_MSS 576 /* default maximum segment size */
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