1 /* $OpenBSD: dhcp.h,v 1.5 2004/05/04 15:49:49 deraadt Exp $ */
4 /* Protocol structures... */
7 * SPDX-License-Identifier: BSD-3-Clause
9 * Copyright (c) 1995, 1996 The Internet Software Consortium.
10 * All rights reserved.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of The Internet Software Consortium nor the names
22 * of its contributors may be used to endorse or promote products derived
23 * from this software without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
26 * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
27 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
28 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
29 * DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
30 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
31 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
32 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
33 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
34 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
35 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
36 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 * This software has been written for the Internet Software Consortium
40 * by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
41 * Enterprises. To learn more about the Internet Software Consortium,
42 * see ``http://www.vix.com/isc''. To learn more about Vixie
43 * Enterprises, see ``http://www.vix.com''.
46 #define DHCP_UDP_OVERHEAD (14 + /* Ethernet header */ \
47 20 + /* IP header */ \
49 #define DHCP_SNAME_LEN 64
50 #define DHCP_FILE_LEN 128
51 #define DHCP_FIXED_NON_UDP 236
52 #define DHCP_FIXED_LEN (DHCP_FIXED_NON_UDP + DHCP_UDP_OVERHEAD)
53 /* Everything but options. */
54 #define DHCP_MTU_MAX 1500
55 #define DHCP_OPTION_LEN (DHCP_MTU_MAX - DHCP_FIXED_LEN)
57 #define BOOTP_MIN_LEN 300
58 #define DHCP_MIN_LEN 548
61 u_int8_t op; /* Message opcode/type */
62 u_int8_t htype; /* Hardware addr type (see net/if_types.h) */
63 u_int8_t hlen; /* Hardware addr length */
64 u_int8_t hops; /* Number of relay agent hops from client */
65 u_int32_t xid; /* Transaction ID */
66 u_int16_t secs; /* Seconds since client started looking */
67 u_int16_t flags; /* Flag bits */
68 struct in_addr ciaddr; /* Client IP address (if already in use) */
69 struct in_addr yiaddr; /* Client IP address */
70 struct in_addr siaddr; /* IP address of next server to talk to */
71 struct in_addr giaddr; /* DHCP relay agent IP address */
72 unsigned char chaddr[16]; /* Client hardware address */
73 char sname[DHCP_SNAME_LEN]; /* Server name */
74 char file[DHCP_FILE_LEN]; /* Boot filename */
75 unsigned char options[DHCP_OPTION_LEN];
76 /* Optional parameters
77 (actual length dependent on MTU). */
80 /* BOOTP (rfc951) message types */
84 /* Possible values for flags field... */
85 #define BOOTP_BROADCAST 32768L
87 /* Possible values for hardware type (htype) field... */
88 #define HTYPE_ETHER 1 /* Ethernet */
89 #define HTYPE_IEEE802 6 /* IEEE 802.2 Token Ring... */
90 #define HTYPE_FDDI 8 /* FDDI... */
92 /* Magic cookie validating dhcp options field (and bootp vendor
94 #define DHCP_OPTIONS_COOKIE "\143\202\123\143"
96 /* DHCP Option codes: */
99 #define DHO_SUBNET_MASK 1
100 #define DHO_TIME_OFFSET 2
101 #define DHO_ROUTERS 3
102 #define DHO_TIME_SERVERS 4
103 #define DHO_NAME_SERVERS 5
104 #define DHO_DOMAIN_NAME_SERVERS 6
105 #define DHO_LOG_SERVERS 7
106 #define DHO_COOKIE_SERVERS 8
107 #define DHO_LPR_SERVERS 9
108 #define DHO_IMPRESS_SERVERS 10
109 #define DHO_RESOURCE_LOCATION_SERVERS 11
110 #define DHO_HOST_NAME 12
111 #define DHO_BOOT_SIZE 13
112 #define DHO_MERIT_DUMP 14
113 #define DHO_DOMAIN_NAME 15
114 #define DHO_SWAP_SERVER 16
115 #define DHO_ROOT_PATH 17
116 #define DHO_EXTENSIONS_PATH 18
117 #define DHO_IP_FORWARDING 19
118 #define DHO_NON_LOCAL_SOURCE_ROUTING 20
119 #define DHO_POLICY_FILTER 21
120 #define DHO_MAX_DGRAM_REASSEMBLY 22
121 #define DHO_DEFAULT_IP_TTL 23
122 #define DHO_PATH_MTU_AGING_TIMEOUT 24
123 #define DHO_PATH_MTU_PLATEAU_TABLE 25
124 #define DHO_INTERFACE_MTU 26
125 #define DHO_ALL_SUBNETS_LOCAL 27
126 #define DHO_BROADCAST_ADDRESS 28
127 #define DHO_PERFORM_MASK_DISCOVERY 29
128 #define DHO_MASK_SUPPLIER 30
129 #define DHO_ROUTER_DISCOVERY 31
130 #define DHO_ROUTER_SOLICITATION_ADDRESS 32
131 #define DHO_STATIC_ROUTES 33
132 #define DHO_TRAILER_ENCAPSULATION 34
133 #define DHO_ARP_CACHE_TIMEOUT 35
134 #define DHO_IEEE802_3_ENCAPSULATION 36
135 #define DHO_DEFAULT_TCP_TTL 37
136 #define DHO_TCP_KEEPALIVE_INTERVAL 38
137 #define DHO_TCP_KEEPALIVE_GARBAGE 39
138 #define DHO_NIS_DOMAIN 40
139 #define DHO_NIS_SERVERS 41
140 #define DHO_NTP_SERVERS 42
141 #define DHO_VENDOR_ENCAPSULATED_OPTIONS 43
142 #define DHO_NETBIOS_NAME_SERVERS 44
143 #define DHO_NETBIOS_DD_SERVER 45
144 #define DHO_NETBIOS_NODE_TYPE 46
145 #define DHO_NETBIOS_SCOPE 47
146 #define DHO_FONT_SERVERS 48
147 #define DHO_X_DISPLAY_MANAGER 49
148 #define DHO_DHCP_REQUESTED_ADDRESS 50
149 #define DHO_DHCP_LEASE_TIME 51
150 #define DHO_DHCP_OPTION_OVERLOAD 52
151 #define DHO_DHCP_MESSAGE_TYPE 53
152 #define DHO_DHCP_SERVER_IDENTIFIER 54
153 #define DHO_DHCP_PARAMETER_REQUEST_LIST 55
154 #define DHO_DHCP_MESSAGE 56
155 #define DHO_DHCP_MAX_MESSAGE_SIZE 57
156 #define DHO_DHCP_RENEWAL_TIME 58
157 #define DHO_DHCP_REBINDING_TIME 59
158 #define DHO_DHCP_CLASS_IDENTIFIER 60
159 #define DHO_DHCP_CLIENT_IDENTIFIER 61
160 #define DHO_NISPLUS_DOMAIN 64
161 #define DHO_NISPLUS_SERVERS 65
162 #define DHO_TFTP_SERVER_NAME 66
163 #define DHO_BOOTFILE_NAME 67
164 #define DHO_MOBILE_IP_HOME_AGENT 68
165 #define DHO_SMTP_SERVER 69
166 #define DHO_POP_SERVER 70
167 #define DHO_NNTP_SERVER 71
168 #define DHO_WWW_SERVER 72
169 #define DHO_FINGER_SERVER 73
170 #define DHO_IRC_SERVER 74
171 #define DHO_STREETTALK_SERVER 75
172 #define DHO_STREETTALK_DA_SERVER 76
173 #define DHO_DHCP_USER_CLASS_ID 77
175 #define DHO_DOMAIN_SEARCH 119
176 #define DHO_CLASSLESS_ROUTES 121
179 /* DHCP message types. */
180 #define DHCPDISCOVER 1
182 #define DHCPREQUEST 3
183 #define DHCPDECLINE 4
186 #define DHCPRELEASE 7