2 * Copyright (c) 1982, 1986 Regents of the University of California.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
33 * @(#)ip.h 7.10 (Berkeley) 6/28/90
39 #include <netinet/in_systm.h>
40 #include <netinet/in.h>
43 #error BYTE_ORDER undefined
46 * Definitions for internet protocol version 4.
47 * Per RFC 791, September 1981.
52 * Structure of an internet header, naked of options.
54 * We declare ip_len and ip_off to be short, rather than u_short
55 * pragmatically since otherwise unsigned comparisons can result
56 * against negative integers quite easily, and fail in subtle ways.
59 #if BYTE_ORDER == LITTLE_ENDIAN
60 u_char ip_hl
:4; /* header length */
61 u_char ip_v
:4; /* version */
63 #if BYTE_ORDER == BIG_ENDIAN
64 u_char ip_v
:4; /* version */
65 u_char ip_hl
:4; /* header length */
67 u_char ip_tos
; /* type of service */
68 short ip_len
; /* total length */
69 u_short ip_id
; /* identification */
70 short ip_off
; /* fragment offset field */
71 #define IP_DF 0x4000 /* dont fragment flag */
72 #define IP_MF 0x2000 /* more fragments flag */
73 u_char ip_ttl
; /* time to live */
74 u_char ip_p
; /* protocol */
75 u_short ip_sum
; /* checksum */
76 struct in_addr ip_src
,ip_dst
; /* source and dest address */
79 #define IP_MAXPACKET 65535 /* maximum packet size */
82 * Definitions for IP type of service (ip_tos)
84 #define IPTOS_LOWDELAY 0x10
85 #define IPTOS_THROUGHPUT 0x08
86 #define IPTOS_RELIABILITY 0x04
89 * Definitions for IP precedence (also in ip_tos) (hopefully unused)
91 #define IPTOS_PREC_NETCONTROL 0xe0
92 #define IPTOS_PREC_INTERNETCONTROL 0xc0
93 #define IPTOS_PREC_CRITIC_ECP 0xa0
94 #define IPTOS_PREC_FLASHOVERRIDE 0x80
95 #define IPTOS_PREC_FLASH 0x60
96 #define IPTOS_PREC_IMMEDIATE 0x40
97 #define IPTOS_PREC_PRIORITY 0x20
98 #define IPTOS_PREC_ROUTINE 0x10
101 * Definitions for options.
103 #define IPOPT_COPIED(o) ((o)&0x80)
104 #define IPOPT_CLASS(o) ((o)&0x60)
105 #define IPOPT_NUMBER(o) ((o)&0x1f)
107 #define IPOPT_CONTROL 0x00
108 #define IPOPT_RESERVED1 0x20
109 #define IPOPT_DEBMEAS 0x40
110 #define IPOPT_RESERVED2 0x60
112 #define IPOPT_EOL 0 /* end of option list */
113 #define IPOPT_NOP 1 /* no operation */
115 #define IPOPT_RR 7 /* record packet route */
116 #define IPOPT_TS 68 /* timestamp */
117 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
118 #define IPOPT_LSRR 131 /* loose source route */
119 #define IPOPT_SATID 136 /* satnet id */
120 #define IPOPT_SSRR 137 /* strict source route */
123 * Offsets to fields in options other than EOL and NOP.
125 #define IPOPT_OPTVAL 0 /* option ID */
126 #define IPOPT_OLEN 1 /* option length */
127 #define IPOPT_OFFSET 2 /* offset within option */
128 #define IPOPT_MINOFF 4 /* min value of above */
131 * Time stamp option structure.
133 struct ip_timestamp
{
134 u_char ipt_code
; /* IPOPT_TS */
135 u_char ipt_len
; /* size of structure (variable) */
136 u_char ipt_ptr
; /* index of current entry */
137 #if BYTE_ORDER == LITTLE_ENDIAN
138 u_char ipt_flg
:4; /* flags, see below */
139 u_char ipt_oflw
:4; /* overflow counter */
141 #if BYTE_ORDER == BIG_ENDIAN
142 u_char ipt_oflw
:4; /* overflow counter */
143 u_char ipt_flg
:4; /* flags, see below */
145 union ipt_timestamp
{
148 struct in_addr ipt_addr
;
154 /* flag bits for ipt_flg */
155 #define IPOPT_TS_TSONLY 0 /* timestamps only */
156 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
157 #define IPOPT_TS_PRESPEC 3 /* specified modules only */
159 /* bits for security (not byte swapped) */
160 #define IPOPT_SECUR_UNCLASS 0x0000
161 #define IPOPT_SECUR_CONFID 0xf135
162 #define IPOPT_SECUR_EFTO 0x789a
163 #define IPOPT_SECUR_MMMM 0xbc4d
164 #define IPOPT_SECUR_RESTR 0xaf13
165 #define IPOPT_SECUR_SECRET 0xd788
166 #define IPOPT_SECUR_TOPSECRET 0x6bc5
169 * Internet implementation parameters.
171 #define MAXTTL 255 /* maximum time to live (seconds) */
172 #define IPFRAGTTL 60 /* time to live for frags, slowhz */
173 #define IPTTLDEC 1 /* subtracted when forwarding */
175 #define IP_MSS 576 /* default maximum segment size */