ISC DHCP 4.4.3-P1
A reference DHCPv4 and DHCPv6 implementation
 
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ip.h
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1/* $NetBSD: ip.h,v 1.9 1995/05/15 01:22:44 cgd Exp $ */
2
3/*
4 * Copyright (c) 1982, 1986, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)ip.h 8.1 (Berkeley) 6/10/93
32 */
33
34/*
35 * Definitions for internet protocol version 4.
36 * Per RFC 791, September 1981.
37 */
38#define IPVERSION 4
39
40/*
41 * Structure of an internet header, naked of options.
42 *
43 * We declare ip_len and ip_off to be short, rather than u_short
44 * pragmatically since otherwise unsigned comparisons can result
45 * against negative integers quite easily, and fail in subtle ways.
46 */
47struct ip {
48 u_int8_t ip_fvhl; /* header length, version */
49 u_int8_t ip_tos; /* type of service */
50 int16_t ip_len; /* total length */
51 u_int16_t ip_id; /* identification */
52 int16_t ip_off; /* fragment offset field */
53#define IP_DF 0x4000 /* dont fragment flag */
54#define IP_MF 0x2000 /* more fragments flag */
55#define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
56 u_int8_t ip_ttl; /* time to live */
57 u_int8_t ip_p; /* protocol */
58 u_int16_t ip_sum; /* checksum */
59 struct in_addr ip_src, ip_dst; /* source and dest address */
60};
61
62#define IP_V(iph) ((iph)->ip_fvhl >> 4)
63#define IP_HL(iph) (((iph)->ip_fvhl & 0x0F) << 2)
64#define IP_V_SET(iph,x) ((iph)->ip_fvhl = ((iph)->ip_fvhl & 0x0F) | ((x) << 4))
65#define IP_HL_SET(iph,x) ((iph)->ip_fvhl = \
66 ((iph)->ip_fvhl & 0xF0) | (((x) >> 2) & 0x0F))
67
68#define IP_MAXPACKET 65535 /* maximum packet size */
69
70/*
71 * Definitions for IP type of service (ip_tos)
72 */
73#define IPTOS_LOWDELAY 0x10
74#define IPTOS_THROUGHPUT 0x08
75#define IPTOS_RELIABILITY 0x04
76/* IPTOS_LOWCOST 0x02 XXX */
77
78/*
79 * Definitions for IP precedence (also in ip_tos) (hopefully unused)
80 */
81#define IPTOS_PREC_NETCONTROL 0xe0
82#define IPTOS_PREC_INTERNETCONTROL 0xc0
83#define IPTOS_PREC_CRITIC_ECP 0xa0
84#define IPTOS_PREC_FLASHOVERRIDE 0x80
85#define IPTOS_PREC_FLASH 0x60
86#define IPTOS_PREC_IMMEDIATE 0x40
87#define IPTOS_PREC_PRIORITY 0x20
88#define IPTOS_PREC_ROUTINE 0x00
89
90/*
91 * Definitions for options.
92 */
93#define IPOPT_COPIED(o) ((o)&0x80)
94#define IPOPT_CLASS(o) ((o)&0x60)
95#define IPOPT_NUMBER(o) ((o)&0x1f)
96
97#define IPOPT_CONTROL 0x00
98#define IPOPT_RESERVED1 0x20
99#define IPOPT_DEBMEAS 0x40
100#define IPOPT_RESERVED2 0x60
101
102#define IPOPT_EOL 0 /* end of option list */
103#define IPOPT_NOP 1 /* no operation */
104
105#define IPOPT_RR 7 /* record packet route */
106#define IPOPT_TS 68 /* timestamp */
107#define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
108#define IPOPT_LSRR 131 /* loose source route */
109#define IPOPT_SATID 136 /* satnet id */
110#define IPOPT_SSRR 137 /* strict source route */
111
112/*
113 * Offsets to fields in options other than EOL and NOP.
114 */
115#define IPOPT_OPTVAL 0 /* option ID */
116#define IPOPT_OLEN 1 /* option length */
117#define IPOPT_OFFSET 2 /* offset within option */
118#define IPOPT_MINOFF 4 /* min value of above */
119
120/*
121 * Time stamp option structure.
122 */
124 u_int8_t ipt_code; /* IPOPT_TS */
125 u_int8_t ipt_len; /* size of structure (variable) */
126 u_int8_t ipt_ptr; /* index of current entry */
127 u_int8_t ipt_flg_oflw; /* flags, see below, overflow counter */
129 u_int32_t ipt_time[1];
130 struct ipt_ta {
131 struct in_addr ipt_addr;
132 u_int32_t ipt_time;
133 } ipt_ta[1];
135};
136
137/* flag bits for ipt_flg */
138#define IPOPT_TS_TSONLY 0 /* timestamps only */
139#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
140#define IPOPT_TS_PRESPEC 3 /* specified modules only */
141
142/* bits for security (not byte swapped) */
143#define IPOPT_SECUR_UNCLASS 0x0000
144#define IPOPT_SECUR_CONFID 0xf135
145#define IPOPT_SECUR_EFTO 0x789a
146#define IPOPT_SECUR_MMMM 0xbc4d
147#define IPOPT_SECUR_RESTR 0xaf13
148#define IPOPT_SECUR_SECRET 0xd788
149#define IPOPT_SECUR_TOPSECRET 0x6bc5
150
151/*
152 * Internet implementation parameters.
153 */
154#define MAXTTL 255 /* maximum time to live (seconds) */
155#define IPDEFTTL 64 /* default ttl, from RFC 1340 */
156#define IPFRAGTTL 60 /* time to live for frags, slowhz */
157#define IPTTLDEC 1 /* subtracted when forwarding */
158
159#define IP_MSS 576 /* default maximum segment size */
union ip_timestamp::ipt_timestamp ipt_timestamp
u_int8_t ipt_code
Definition ip.h:124
u_int8_t ipt_ptr
Definition ip.h:126
u_int8_t ipt_flg_oflw
Definition ip.h:127
u_int8_t ipt_len
Definition ip.h:125
Definition ip.h:47
u_int8_t ip_tos
Definition ip.h:49
int16_t ip_off
Definition ip.h:52
u_int8_t ip_p
Definition ip.h:57
struct in_addr ip_src ip_dst
Definition ip.h:59
u_int16_t ip_id
Definition ip.h:51
u_int16_t ip_sum
Definition ip.h:58
int16_t ip_len
Definition ip.h:50
u_int8_t ip_ttl
Definition ip.h:56
u_int8_t ip_fvhl
Definition ip.h:48
u_int32_t ipt_time[1]
Definition ip.h:129
struct ip_timestamp::ipt_timestamp::ipt_ta ipt_ta[1]