2 * IPv4 header and options.
6 * Copyright (c) 1982, 1986, 1993
7 * The Regents of the University of California. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by the University of
20 * California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * @(#)ip.h 8.2 (Berkeley) 6/1/94
38 * $Id: ip.h,v 1.10 1996/10/23 18:35:49 wollman Exp $
41 #ifndef __NETINET_IP_H
42 #define __NETINET_IP_H
44 #ifndef __NETINET_IN_SYSTM_H
45 #include <netinet/in_systm.h>
48 #if defined(__TURBOC__) || defined(__BORLANDC__)
49 #pragma warn -bbf- /* "Bitfields must be signed or unsigned int" warning */
53 * Definitions for internet protocol version 4.
54 * Per RFC 791, September 1981.
58 #include <sys/packon.h>
61 * Structure of an internet header, naked of options.
63 * We declare ip_len and ip_off to be short, rather than u_short
64 * pragmatically since otherwise unsigned comparisons can result
65 * against negative integers quite easily, and fail in subtle ways.
69 u_char ip_vhl; /* version << 4 | header length >> 2 */
71 u_char ip_hl:4; /* header length */
72 u_char ip_v:4; /* version */
74 u_char ip_tos; /* type of service */
75 u_short ip_len; /* total length */
76 u_short ip_id; /* identification */
77 u_short ip_off; /* fragment offset field */
78 #define IP_DF 0x4000 /* dont fragment flag */
79 #define IP_MF 0x2000 /* more fragments flag */
80 #define IP_OFFMASK 0x1FFF /* mask for fragmenting bits */
81 u_char ip_ttl; /* time to live */
82 u_char ip_p; /* protocol */
83 u_short ip_sum; /* checksum */
84 struct in_addr ip_src,ip_dst; /* source and dest address */
88 #define IP_MAKE_VHL(v,hl) ((v) << 4 | (hl))
89 #define IP_VHL_HL(vhl) ((vhl) & 0x0f)
90 #define IP_VHL_V(vhl) ((vhl) >> 4)
91 #define IP_VHL_BORING 0x45
94 #define IP_MAXPACKET 65535 /* maximum packet size */
97 * Definitions for IP type of service (ip_tos)
99 #define IPTOS_LOWDELAY 0x10
100 #define IPTOS_THROUGHPUT 0x08
101 #define IPTOS_RELIABILITY 0x04
102 #define IPTOS_MINCOST 0x02
105 * Definitions for IP precedence (also in ip_tos) (hopefully unused)
107 #define IPTOS_PREC_NETCONTROL 0xe0
108 #define IPTOS_PREC_INTERNETCONTROL 0xc0
109 #define IPTOS_PREC_CRITIC_ECP 0xa0
110 #define IPTOS_PREC_FLASHOVERRIDE 0x80
111 #define IPTOS_PREC_FLASH 0x60
112 #define IPTOS_PREC_IMMEDIATE 0x40
113 #define IPTOS_PREC_PRIORITY 0x20
114 #define IPTOS_PREC_ROUTINE 0x00
117 * Definitions for options.
119 #define IPOPT_COPIED(o) ((o)&0x80)
120 #define IPOPT_CLASS(o) ((o)&0x60)
121 #define IPOPT_NUMBER(o) ((o)&0x1f)
123 #define IPOPT_CONTROL 0x00
124 #define IPOPT_RESERVED1 0x20
125 #define IPOPT_DEBMEAS 0x40
126 #define IPOPT_RESERVED2 0x60
128 #define IPOPT_EOL 0 /* end of option list */
129 #define IPOPT_NOP 1 /* no operation */
131 #define IPOPT_RR 7 /* record packet route */
132 #define IPOPT_TS 68 /* timestamp */
133 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
134 #define IPOPT_LSRR 131 /* loose source route */
135 #define IPOPT_SATID 136 /* satnet id */
136 #define IPOPT_SSRR 137 /* strict source route */
137 #define IPOPT_RA 148 /* router alert */
140 * Offsets to fields in options other than EOL and NOP.
142 #define IPOPT_OPTVAL 0 /* option ID */
143 #define IPOPT_OLEN 1 /* option length */
144 #define IPOPT_OFFSET 2 /* offset within option */
145 #define IPOPT_MINOFF 4 /* min value of above */
148 * Time stamp option structure.
150 struct ip_timestamp {
151 u_char ipt_code; /* IPOPT_TS */
152 u_char ipt_len; /* size of structure (variable) */
153 u_char ipt_ptr; /* index of current entry */
154 u_char ipt_flg:4; /* flags, see below */
155 u_char ipt_oflw:4; /* overflow counter */
156 union ipt_timestamp {
159 struct in_addr ipt_addr;
165 #include <sys/packoff.h>
167 /* flag bits for ipt_flg */
168 #define IPOPT_TS_TSONLY 0 /* timestamps only */
169 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
170 #define IPOPT_TS_PRESPEC 3 /* specified modules only */
172 /* bits for security (not byte swapped) */
173 #define IPOPT_SECUR_UNCLASS 0x0000
174 #define IPOPT_SECUR_CONFID 0xf135
175 #define IPOPT_SECUR_EFTO 0x789a
176 #define IPOPT_SECUR_MMMM 0xbc4d
177 #define IPOPT_SECUR_RESTR 0xaf13
178 #define IPOPT_SECUR_SECRET 0xd788
179 #define IPOPT_SECUR_TOPSECRET 0x6bc5
182 * Internet implementation parameters.
184 #define MAXTTL 255 /* maximum time to live (seconds) */
185 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */
186 #define IPFRAGTTL 60 /* time to live for frags, slowhz */
187 #define IPTTLDEC 1 /* subtracted when forwarding */
189 #define IP_MSS 576 /* default maximum segment size */
191 #if defined(__TURBOC__) || defined(__BORLANDC__)