1 /* $OpenBSD: dhcp.h,v 1.5 2004/05/04 15:49:49 deraadt Exp $ */ 2 /* $FreeBSD$ */ 3 4 /* Protocol structures... */ 5 6 /* 7 * Copyright (c) 1995, 1996 The Internet Software Consortium. 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of The Internet Software Consortium nor the names 20 * of its contributors may be used to endorse or promote products derived 21 * from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND 24 * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 25 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 27 * DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR 28 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 29 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 30 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 31 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 32 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 33 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 34 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * This software has been written for the Internet Software Consortium 38 * by Ted Lemon <mellon@fugue.com> in cooperation with Vixie 39 * Enterprises. To learn more about the Internet Software Consortium, 40 * see ``http://www.vix.com/isc''. To learn more about Vixie 41 * Enterprises, see ``http://www.vix.com''. 42 */ 43 44 #define DHCP_UDP_OVERHEAD (14 + /* Ethernet header */ \ 45 20 + /* IP header */ \ 46 8) /* UDP header */ 47 #define DHCP_SNAME_LEN 64 48 #define DHCP_FILE_LEN 128 49 #define DHCP_FIXED_NON_UDP 236 50 #define DHCP_FIXED_LEN (DHCP_FIXED_NON_UDP + DHCP_UDP_OVERHEAD) 51 /* Everything but options. */ 52 #define DHCP_MTU_MAX 1500 53 #define DHCP_OPTION_LEN (DHCP_MTU_MAX - DHCP_FIXED_LEN) 54 55 #define BOOTP_MIN_LEN 300 56 #define DHCP_MIN_LEN 548 57 58 struct dhcp_packet { 59 u_int8_t op; /* Message opcode/type */ 60 u_int8_t htype; /* Hardware addr type (see net/if_types.h) */ 61 u_int8_t hlen; /* Hardware addr length */ 62 u_int8_t hops; /* Number of relay agent hops from client */ 63 u_int32_t xid; /* Transaction ID */ 64 u_int16_t secs; /* Seconds since client started looking */ 65 u_int16_t flags; /* Flag bits */ 66 struct in_addr ciaddr; /* Client IP address (if already in use) */ 67 struct in_addr yiaddr; /* Client IP address */ 68 struct in_addr siaddr; /* IP address of next server to talk to */ 69 struct in_addr giaddr; /* DHCP relay agent IP address */ 70 unsigned char chaddr[16]; /* Client hardware address */ 71 char sname[DHCP_SNAME_LEN]; /* Server name */ 72 char file[DHCP_FILE_LEN]; /* Boot filename */ 73 unsigned char options[DHCP_OPTION_LEN]; 74 /* Optional parameters 75 (actual length dependent on MTU). */ 76 }; 77 78 /* BOOTP (rfc951) message types */ 79 #define BOOTREQUEST 1 80 #define BOOTREPLY 2 81 82 /* Possible values for flags field... */ 83 #define BOOTP_BROADCAST 32768L 84 85 /* Possible values for hardware type (htype) field... */ 86 #define HTYPE_ETHER 1 /* Ethernet */ 87 #define HTYPE_IEEE802 6 /* IEEE 802.2 Token Ring... */ 88 #define HTYPE_FDDI 8 /* FDDI... */ 89 90 /* Magic cookie validating dhcp options field (and bootp vendor 91 extensions field). */ 92 #define DHCP_OPTIONS_COOKIE "\143\202\123\143" 93 94 /* DHCP Option codes: */ 95 96 #define DHO_PAD 0 97 #define DHO_SUBNET_MASK 1 98 #define DHO_TIME_OFFSET 2 99 #define DHO_ROUTERS 3 100 #define DHO_TIME_SERVERS 4 101 #define DHO_NAME_SERVERS 5 102 #define DHO_DOMAIN_NAME_SERVERS 6 103 #define DHO_LOG_SERVERS 7 104 #define DHO_COOKIE_SERVERS 8 105 #define DHO_LPR_SERVERS 9 106 #define DHO_IMPRESS_SERVERS 10 107 #define DHO_RESOURCE_LOCATION_SERVERS 11 108 #define DHO_HOST_NAME 12 109 #define DHO_BOOT_SIZE 13 110 #define DHO_MERIT_DUMP 14 111 #define DHO_DOMAIN_NAME 15 112 #define DHO_SWAP_SERVER 16 113 #define DHO_ROOT_PATH 17 114 #define DHO_EXTENSIONS_PATH 18 115 #define DHO_IP_FORWARDING 19 116 #define DHO_NON_LOCAL_SOURCE_ROUTING 20 117 #define DHO_POLICY_FILTER 21 118 #define DHO_MAX_DGRAM_REASSEMBLY 22 119 #define DHO_DEFAULT_IP_TTL 23 120 #define DHO_PATH_MTU_AGING_TIMEOUT 24 121 #define DHO_PATH_MTU_PLATEAU_TABLE 25 122 #define DHO_INTERFACE_MTU 26 123 #define DHO_ALL_SUBNETS_LOCAL 27 124 #define DHO_BROADCAST_ADDRESS 28 125 #define DHO_PERFORM_MASK_DISCOVERY 29 126 #define DHO_MASK_SUPPLIER 30 127 #define DHO_ROUTER_DISCOVERY 31 128 #define DHO_ROUTER_SOLICITATION_ADDRESS 32 129 #define DHO_STATIC_ROUTES 33 130 #define DHO_TRAILER_ENCAPSULATION 34 131 #define DHO_ARP_CACHE_TIMEOUT 35 132 #define DHO_IEEE802_3_ENCAPSULATION 36 133 #define DHO_DEFAULT_TCP_TTL 37 134 #define DHO_TCP_KEEPALIVE_INTERVAL 38 135 #define DHO_TCP_KEEPALIVE_GARBAGE 39 136 #define DHO_NIS_DOMAIN 40 137 #define DHO_NIS_SERVERS 41 138 #define DHO_NTP_SERVERS 42 139 #define DHO_VENDOR_ENCAPSULATED_OPTIONS 43 140 #define DHO_NETBIOS_NAME_SERVERS 44 141 #define DHO_NETBIOS_DD_SERVER 45 142 #define DHO_NETBIOS_NODE_TYPE 46 143 #define DHO_NETBIOS_SCOPE 47 144 #define DHO_FONT_SERVERS 48 145 #define DHO_X_DISPLAY_MANAGER 49 146 #define DHO_DHCP_REQUESTED_ADDRESS 50 147 #define DHO_DHCP_LEASE_TIME 51 148 #define DHO_DHCP_OPTION_OVERLOAD 52 149 #define DHO_DHCP_MESSAGE_TYPE 53 150 #define DHO_DHCP_SERVER_IDENTIFIER 54 151 #define DHO_DHCP_PARAMETER_REQUEST_LIST 55 152 #define DHO_DHCP_MESSAGE 56 153 #define DHO_DHCP_MAX_MESSAGE_SIZE 57 154 #define DHO_DHCP_RENEWAL_TIME 58 155 #define DHO_DHCP_REBINDING_TIME 59 156 #define DHO_DHCP_CLASS_IDENTIFIER 60 157 #define DHO_DHCP_CLIENT_IDENTIFIER 61 158 #define DHO_SMTP_SERVER 69 159 #define DHO_POP_SERVER 70 160 #define DHO_NNTP_SERVER 71 161 #define DHO_WWW_SERVER 72 162 #define DHO_FINGER_SERVER 73 163 #define DHO_IRC_SERVER 74 164 #define DHO_DHCP_USER_CLASS_ID 77 165 #define DHO_CLASSLESS_ROUTES 121 166 #define DHO_END 255 167 168 /* DHCP message types. */ 169 #define DHCPDISCOVER 1 170 #define DHCPOFFER 2 171 #define DHCPREQUEST 3 172 #define DHCPDECLINE 4 173 #define DHCPACK 5 174 #define DHCPNAK 6 175 #define DHCPRELEASE 7 176 #define DHCPINFORM 8 177