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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 and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 3. All advertising materials mentioning features or use of this software
14: * must display the following acknowledgement:
15: * This product includes software developed by the University of
16: * California, Berkeley and its contributors.
17: * 4. Neither the name of the University nor the names of its contributors
18: * may be used to endorse or promote products derived from this software
19: * without specific prior written permission.
20: *
21: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31: * SUCH DAMAGE.
32: *
33: * @(#)ip.h 7.10 (Berkeley) 6/28/90
34: */
35:
36: /*
37: * Definitions for internet protocol version 4.
38: * Per RFC 791, September 1981.
39: */
40: #define IPVERSION 4
41:
42: /*
43: * Structure of an internet header, naked of options.
44: *
45: * We declare ip_len and ip_off to be short, rather than u_short
46: * pragmatically since otherwise unsigned comparisons can result
47: * against negative integers quite easily, and fail in subtle ways.
48: */
49: struct ip {
50: #if BYTE_ORDER == LITTLE_ENDIAN
51: u_char ip_hl:4, /* header length */
52: ip_v:4; /* version */
53: #endif
54: #if BYTE_ORDER == BIG_ENDIAN
55: u_char ip_v:4, /* version */
56: ip_hl:4; /* header length */
57: #endif
58: u_char ip_tos; /* type of service */
59: short ip_len; /* total length */
60: u_short ip_id; /* identification */
61: short ip_off; /* fragment offset field */
62: #define IP_DF 0x4000 /* dont fragment flag */
63: #define IP_MF 0x2000 /* more fragments flag */
64: u_char ip_ttl; /* time to live */
65: u_char ip_p; /* protocol */
66: u_short ip_sum; /* checksum */
67: struct in_addr ip_src,ip_dst; /* source and dest address */
68: };
69:
70: #define IP_MAXPACKET 65535 /* maximum packet size */
71:
72: /*
73: * Definitions for IP type of service (ip_tos)
74: */
75: #define IPTOS_LOWDELAY 0x10
76: #define IPTOS_THROUGHPUT 0x08
77: #define IPTOS_RELIABILITY 0x04
78:
79: /*
80: * Definitions for IP precedence (also in ip_tos) (hopefully unused)
81: */
82: #define IPTOS_PREC_NETCONTROL 0xe0
83: #define IPTOS_PREC_INTERNETCONTROL 0xc0
84: #define IPTOS_PREC_CRITIC_ECP 0xa0
85: #define IPTOS_PREC_FLASHOVERRIDE 0x80
86: #define IPTOS_PREC_FLASH 0x60
87: #define IPTOS_PREC_IMMEDIATE 0x40
88: #define IPTOS_PREC_PRIORITY 0x20
89: #define IPTOS_PREC_ROUTINE 0x10
90:
91: /*
92: * Definitions for options.
93: */
94: #define IPOPT_COPIED(o) ((o)&0x80)
95: #define IPOPT_CLASS(o) ((o)&0x60)
96: #define IPOPT_NUMBER(o) ((o)&0x1f)
97:
98: #define IPOPT_CONTROL 0x00
99: #define IPOPT_RESERVED1 0x20
100: #define IPOPT_DEBMEAS 0x40
101: #define IPOPT_RESERVED2 0x60
102:
103: #define IPOPT_EOL 0 /* end of option list */
104: #define IPOPT_NOP 1 /* no operation */
105:
106: #define IPOPT_RR 7 /* record packet route */
107: #define IPOPT_TS 68 /* timestamp */
108: #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
109: #define IPOPT_LSRR 131 /* loose source route */
110: #define IPOPT_SATID 136 /* satnet id */
111: #define IPOPT_SSRR 137 /* strict source route */
112:
113: /*
114: * Offsets to fields in options other than EOL and NOP.
115: */
116: #define IPOPT_OPTVAL 0 /* option ID */
117: #define IPOPT_OLEN 1 /* option length */
118: #define IPOPT_OFFSET 2 /* offset within option */
119: #define IPOPT_MINOFF 4 /* min value of above */
120:
121: /*
122: * Time stamp option structure.
123: */
124: struct ip_timestamp {
125: u_char ipt_code; /* IPOPT_TS */
126: u_char ipt_len; /* size of structure (variable) */
127: u_char ipt_ptr; /* index of current entry */
128: #if BYTE_ORDER == LITTLE_ENDIAN
129: u_char ipt_flg:4, /* flags, see below */
130: ipt_oflw:4; /* overflow counter */
131: #endif
132: #if BYTE_ORDER == BIG_ENDIAN
133: u_char ipt_oflw:4, /* overflow counter */
134: ipt_flg:4; /* flags, see below */
135: #endif
136: union ipt_timestamp {
137: n_long ipt_time[1];
138: struct ipt_ta {
139: struct in_addr ipt_addr;
140: n_long ipt_time;
141: } ipt_ta[1];
142: } ipt_timestamp;
143: };
144:
145: /* flag bits for ipt_flg */
146: #define IPOPT_TS_TSONLY 0 /* timestamps only */
147: #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
148: #define IPOPT_TS_PRESPEC 3 /* specified modules only */
149:
150: /* bits for security (not byte swapped) */
151: #define IPOPT_SECUR_UNCLASS 0x0000
152: #define IPOPT_SECUR_CONFID 0xf135
153: #define IPOPT_SECUR_EFTO 0x789a
154: #define IPOPT_SECUR_MMMM 0xbc4d
155: #define IPOPT_SECUR_RESTR 0xaf13
156: #define IPOPT_SECUR_SECRET 0xd788
157: #define IPOPT_SECUR_TOPSECRET 0x6bc5
158:
159: /*
160: * Internet implementation parameters.
161: */
162: #define MAXTTL 255 /* maximum time to live (seconds) */
163: #define IPFRAGTTL 60 /* time to live for frags, slowhz */
164: #define IPTTLDEC 1 /* subtracted when forwarding */
165:
166: #define IP_MSS 576 /* default maximum segment size */
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