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Member "trafshow-3.1/linux/netinet/ip.h" of archive trafshow-3.1.tgz:
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1 /*
2 * Copyright (c) 1982, 1986, 1993
3 * The Regents of the University of California. 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 8.2 (Berkeley) 6/1/94
34 */
35
36 #include <endian.h>
37
38 /*
39 * Definitions for internet protocol version 4.
40 * Per RFC 791, September 1981.
41 */
42 #define IPVERSION 4
43
44 /*
45 * Structure of an internet header, naked of options.
46 *
47 * We declare ip_len and ip_off to be short, rather than u_short
48 * pragmatically since otherwise unsigned comparisons can result
49 * against negative integers quite easily, and fail in subtle ways.
50 */
51 struct ip {
52 #if BYTE_ORDER == LITTLE_ENDIAN
53 u_char ip_hl:4, /* header length */
54 ip_v:4; /* version */
55 #endif
56 #if BYTE_ORDER == BIG_ENDIAN
57 u_char ip_v:4, /* version */
58 ip_hl:4; /* header length */
59 #endif
60 u_char ip_tos; /* type of service */
61 short ip_len; /* total length */
62 u_short ip_id; /* identification */
63 short ip_off; /* fragment offset field */
64 #define IP_DF 0x4000 /* dont fragment flag */
65 #define IP_MF 0x2000 /* more fragments flag */
66 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
67 u_char ip_ttl; /* time to live */
68 u_char ip_p; /* protocol */
69 u_short ip_sum; /* checksum */
70 struct in_addr ip_src,ip_dst; /* source and dest address */
71 };
72
73 #define IP_MAXPACKET 65535 /* maximum packet size */
74
75 /*
76 * Definitions for IP type of service (ip_tos)
77 */
78 #define IPTOS_LOWDELAY 0x10
79 #define IPTOS_THROUGHPUT 0x08
80 #define IPTOS_RELIABILITY 0x04
81
82 /*
83 * Definitions for IP precedence (also in ip_tos) (hopefully unused)
84 */
85 #define IPTOS_PREC_NETCONTROL 0xe0
86 #define IPTOS_PREC_INTERNETCONTROL 0xc0
87 #define IPTOS_PREC_CRITIC_ECP 0xa0
88 #define IPTOS_PREC_FLASHOVERRIDE 0x80
89 #define IPTOS_PREC_FLASH 0x60
90 #define IPTOS_PREC_IMMEDIATE 0x40
91 #define IPTOS_PREC_PRIORITY 0x20
92 #define IPTOS_PREC_ROUTINE 0x00
93
94 /*
95 * Definitions for options.
96 */
97 #define IPOPT_COPIED(o) ((o)&0x80)
98 #define IPOPT_CLASS(o) ((o)&0x60)
99 #define IPOPT_NUMBER(o) ((o)&0x1f)
100
101 #define IPOPT_CONTROL 0x00
102 #define IPOPT_RESERVED1 0x20
103 #define IPOPT_DEBMEAS 0x40
104 #define IPOPT_RESERVED2 0x60
105
106 #define IPOPT_EOL 0 /* end of option list */
107 #define IPOPT_NOP 1 /* no operation */
108
109 #define IPOPT_RR 7 /* record packet route */
110 #define IPOPT_TS 68 /* timestamp */
111 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
112 #define IPOPT_LSRR 131 /* loose source route */
113 #define IPOPT_SATID 136 /* satnet id */
114 #define IPOPT_SSRR 137 /* strict source route */
115
116 /*
117 * Offsets to fields in options other than EOL and NOP.
118 */
119 #define IPOPT_OPTVAL 0 /* option ID */
120 #define IPOPT_OLEN 1 /* option length */
121 #define IPOPT_OFFSET 2 /* offset within option */
122 #define IPOPT_MINOFF 4 /* min value of above */
123
124 /*
125 * Time stamp option structure.
126 */
127 struct ip_timestamp {
128 u_char ipt_code; /* IPOPT_TS */
129 u_char ipt_len; /* size of structure (variable) */
130 u_char ipt_ptr; /* index of current entry */
131 #if BYTE_ORDER == LITTLE_ENDIAN
132 u_char ipt_flg:4, /* flags, see below */
133 ipt_oflw:4; /* overflow counter */
134 #endif
135 #if BYTE_ORDER == BIG_ENDIAN
136 u_char ipt_oflw:4, /* overflow counter */
137 ipt_flg:4; /* flags, see below */
138 #endif
139 union ipt_timestamp {
140 n_long ipt_time[1];
141 struct ipt_ta {
142 struct in_addr ipt_addr;
143 n_long ipt_time;
144 } ipt_ta[1];
145 } ipt_timestamp;
146 };
147
148 /* flag bits for ipt_flg */
149 #define IPOPT_TS_TSONLY 0 /* timestamps only */
150 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
151 #define IPOPT_TS_PRESPEC 3 /* specified modules only */
152
153 /* bits for security (not byte swapped) */
154 #define IPOPT_SECUR_UNCLASS 0x0000
155 #define IPOPT_SECUR_CONFID 0xf135
156 #define IPOPT_SECUR_EFTO 0x789a
157 #define IPOPT_SECUR_MMMM 0xbc4d
158 #define IPOPT_SECUR_RESTR 0xaf13
159 #define IPOPT_SECUR_SECRET 0xd788
160 #define IPOPT_SECUR_TOPSECRET 0x6bc5
161
162 /*
163 * Internet implementation parameters.
164 */
165 #define MAXTTL 255 /* maximum time to live (seconds) */
166 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */
167 #define IPFRAGTTL 60 /* time to live for frags, slowhz */
168 #define IPTTLDEC 1 /* subtracted when forwarding */
169
170 #define IP_MSS 576 /* default maximum segment size */