1 /* $OpenBSD: src/sbin/dhclient/dhcp.h,v 1.9 2011/05/11 14:38:36 krw Exp $ */ 2 3 /* Protocol structures... */ 4 5 /* 6 * Copyright (c) 1995, 1996 The Internet Software Consortium. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of The Internet Software Consortium nor the names 19 * of its contributors may be used to endorse or promote products derived 20 * from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND 23 * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 24 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 26 * DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR 27 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 29 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 30 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 31 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 32 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 33 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * This software has been written for the Internet Software Consortium 37 * by Ted Lemon <mellon@fugue.com> in cooperation with Vixie 38 * Enterprises. To learn more about the Internet Software Consortium, 39 * see ``http://www.vix.com/isc''. To learn more about Vixie 40 * Enterprises, see ``http://www.vix.com''. 41 */ 42 43 #define DHCP_UDP_OVERHEAD (20 + /* IP header */ \ 44 8) /* UDP header */ 45 #define DHCP_SNAME_LEN 64 46 #define DHCP_FILE_LEN 128 47 #define DHCP_FIXED_NON_UDP 236 48 #define DHCP_FIXED_LEN (DHCP_FIXED_NON_UDP + DHCP_UDP_OVERHEAD) 49 /* Everything but options. */ 50 #define DHCP_MTU_MAX 1500 51 #define DHCP_OPTION_LEN (DHCP_MTU_MAX - DHCP_FIXED_LEN) 52 53 #define BOOTP_MIN_LEN 300 54 55 struct dhcp_packet { 56 u_int8_t op; /* Message opcode/type */ 57 u_int8_t htype; /* Hardware addr type (see net/if_types.h) */ 58 u_int8_t hlen; /* Hardware addr length */ 59 u_int8_t hops; /* Number of relay agent hops from client */ 60 u_int32_t xid; /* Transaction ID */ 61 u_int16_t secs; /* Seconds since client started looking */ 62 u_int16_t flags; /* Flag bits */ 63 struct in_addr ciaddr; /* Client IP address (if already in use) */ 64 struct in_addr yiaddr; /* Client IP address */ 65 struct in_addr siaddr; /* IP address of next server to talk to */ 66 struct in_addr giaddr; /* DHCP relay agent IP address */ 67 unsigned char chaddr[16]; /* Client hardware address */ 68 char sname[DHCP_SNAME_LEN]; /* Server name */ 69 char file[DHCP_FILE_LEN]; /* Boot filename */ 70 unsigned char options[DHCP_OPTION_LEN]; 71 /* Optional parameters 72 (actual length dependent on MTU). */ 73 }; 74 75 /* BOOTP (rfc951) message types */ 76 #define BOOTREQUEST 1 77 #define BOOTREPLY 2 78 79 /* Possible values for flags field... */ 80 #define BOOTP_BROADCAST 32768L 81 82 /* Possible values for hardware type (htype) field... */ 83 #define HTYPE_ETHER 1 /* Ethernet */ 84 #define HTYPE_IEEE802 6 /* IEEE 802.2 Token Ring... */ 85 #define HTYPE_FDDI 8 /* FDDI... */ 86 87 /* Magic cookie validating dhcp options field (and bootp vendor 88 extensions field). */ 89 #define DHCP_OPTIONS_COOKIE "\143\202\123\143" 90 #define DHCP_OPTIONS_MESSAGE_TYPE "\065\001\000" 91 92 /* DHCP Option codes: */ 93 94 #define DHO_PAD 0 95 #define DHO_SUBNET_MASK 1 96 #define DHO_TIME_OFFSET 2 97 #define DHO_ROUTERS 3 98 #define DHO_TIME_SERVERS 4 99 #define DHO_NAME_SERVERS 5 100 #define DHO_DOMAIN_NAME_SERVERS 6 101 #define DHO_LOG_SERVERS 7 102 #define DHO_COOKIE_SERVERS 8 103 #define DHO_LPR_SERVERS 9 104 #define DHO_IMPRESS_SERVERS 10 105 #define DHO_RESOURCE_LOCATION_SERVERS 11 106 #define DHO_HOST_NAME 12 107 #define DHO_BOOT_SIZE 13 108 #define DHO_MERIT_DUMP 14 109 #define DHO_DOMAIN_NAME 15 110 #define DHO_SWAP_SERVER 16 111 #define DHO_ROOT_PATH 17 112 #define DHO_EXTENSIONS_PATH 18 113 #define DHO_IP_FORWARDING 19 114 #define DHO_NON_LOCAL_SOURCE_ROUTING 20 115 #define DHO_POLICY_FILTER 21 116 #define DHO_MAX_DGRAM_REASSEMBLY 22 117 #define DHO_DEFAULT_IP_TTL 23 118 #define DHO_PATH_MTU_AGING_TIMEOUT 24 119 #define DHO_PATH_MTU_PLATEAU_TABLE 25 120 #define DHO_INTERFACE_MTU 26 121 #define DHO_ALL_SUBNETS_LOCAL 27 122 #define DHO_BROADCAST_ADDRESS 28 123 #define DHO_PERFORM_MASK_DISCOVERY 29 124 #define DHO_MASK_SUPPLIER 30 125 #define DHO_ROUTER_DISCOVERY 31 126 #define DHO_ROUTER_SOLICITATION_ADDRESS 32 127 #define DHO_STATIC_ROUTES 33 128 #define DHO_TRAILER_ENCAPSULATION 34 129 #define DHO_ARP_CACHE_TIMEOUT 35 130 #define DHO_IEEE802_3_ENCAPSULATION 36 131 #define DHO_DEFAULT_TCP_TTL 37 132 #define DHO_TCP_KEEPALIVE_INTERVAL 38 133 #define DHO_TCP_KEEPALIVE_GARBAGE 39 134 #define DHO_NIS_DOMAIN 40 135 #define DHO_NIS_SERVERS 41 136 #define DHO_NTP_SERVERS 42 137 #define DHO_VENDOR_ENCAPSULATED_OPTIONS 43 138 #define DHO_NETBIOS_NAME_SERVERS 44 139 #define DHO_NETBIOS_DD_SERVER 45 140 #define DHO_NETBIOS_NODE_TYPE 46 141 #define DHO_NETBIOS_SCOPE 47 142 #define DHO_FONT_SERVERS 48 143 #define DHO_X_DISPLAY_MANAGER 49 144 #define DHO_DHCP_REQUESTED_ADDRESS 50 145 #define DHO_DHCP_LEASE_TIME 51 146 #define DHO_DHCP_OPTION_OVERLOAD 52 147 #define DHO_DHCP_MESSAGE_TYPE 53 148 #define DHO_DHCP_SERVER_IDENTIFIER 54 149 #define DHO_DHCP_PARAMETER_REQUEST_LIST 55 150 #define DHO_DHCP_MESSAGE 56 151 #define DHO_DHCP_MAX_MESSAGE_SIZE 57 152 #define DHO_DHCP_RENEWAL_TIME 58 153 #define DHO_DHCP_REBINDING_TIME 59 154 #define DHO_DHCP_CLASS_IDENTIFIER 60 155 #define DHO_DHCP_CLIENT_IDENTIFIER 61 156 #define DHO_TFTP_SERVER 66 157 #define DHO_DHCP_USER_CLASS_ID 77 158 #define DHO_END 255 159 160 /* DHCP message types. */ 161 #define DHCPDISCOVER 1 162 #define DHCPOFFER 2 163 #define DHCPREQUEST 3 164 #define DHCPDECLINE 4 165 #define DHCPACK 5 166 #define DHCPNAK 6 167 #define DHCPRELEASE 7 168 #define DHCPINFORM 8 169