dhcp.h revision 147073
1/* $OpenBSD: dhcp.h,v 1.5 2004/05/04 15:49:49 deraadt 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 (14 + /* Ethernet header */ \ 44 20 + /* IP header */ \ 45 8) /* UDP header */ 46#define DHCP_SNAME_LEN 64 47#define DHCP_FILE_LEN 128 48#define DHCP_FIXED_NON_UDP 236 49#define DHCP_FIXED_LEN (DHCP_FIXED_NON_UDP + DHCP_UDP_OVERHEAD) 50 /* Everything but options. */ 51#define DHCP_MTU_MAX 1500 52#define DHCP_OPTION_LEN (DHCP_MTU_MAX - DHCP_FIXED_LEN) 53 54#define BOOTP_MIN_LEN 300 55#define DHCP_MIN_LEN 548 56 57struct dhcp_packet { 58 u_int8_t op; /* Message opcode/type */ 59 u_int8_t htype; /* Hardware addr type (see net/if_types.h) */ 60 u_int8_t hlen; /* Hardware addr length */ 61 u_int8_t hops; /* Number of relay agent hops from client */ 62 u_int32_t xid; /* Transaction ID */ 63 u_int16_t secs; /* Seconds since client started looking */ 64 u_int16_t flags; /* Flag bits */ 65 struct in_addr ciaddr; /* Client IP address (if already in use) */ 66 struct in_addr yiaddr; /* Client IP address */ 67 struct in_addr siaddr; /* IP address of next server to talk to */ 68 struct in_addr giaddr; /* DHCP relay agent IP address */ 69 unsigned char chaddr[16]; /* Client hardware address */ 70 char sname[DHCP_SNAME_LEN]; /* Server name */ 71 char file[DHCP_FILE_LEN]; /* Boot filename */ 72 unsigned char options[DHCP_OPTION_LEN]; 73 /* Optional parameters 74 (actual length dependent on MTU). */ 75}; 76 77/* BOOTP (rfc951) message types */ 78#define BOOTREQUEST 1 79#define BOOTREPLY 2 80 81/* Possible values for flags field... */ 82#define BOOTP_BROADCAST 32768L 83 84/* Possible values for hardware type (htype) field... */ 85#define HTYPE_ETHER 1 /* Ethernet */ 86#define HTYPE_IEEE802 6 /* IEEE 802.2 Token Ring... */ 87#define HTYPE_FDDI 8 /* FDDI... */ 88 89/* Magic cookie validating dhcp options field (and bootp vendor 90 extensions field). */ 91#define DHCP_OPTIONS_COOKIE "\143\202\123\143" 92 93/* DHCP Option codes: */ 94 95#define DHO_PAD 0 96#define DHO_SUBNET_MASK 1 97#define DHO_TIME_OFFSET 2 98#define DHO_ROUTERS 3 99#define DHO_TIME_SERVERS 4 100#define DHO_NAME_SERVERS 5 101#define DHO_DOMAIN_NAME_SERVERS 6 102#define DHO_LOG_SERVERS 7 103#define DHO_COOKIE_SERVERS 8 104#define DHO_LPR_SERVERS 9 105#define DHO_IMPRESS_SERVERS 10 106#define DHO_RESOURCE_LOCATION_SERVERS 11 107#define DHO_HOST_NAME 12 108#define DHO_BOOT_SIZE 13 109#define DHO_MERIT_DUMP 14 110#define DHO_DOMAIN_NAME 15 111#define DHO_SWAP_SERVER 16 112#define DHO_ROOT_PATH 17 113#define DHO_EXTENSIONS_PATH 18 114#define DHO_IP_FORWARDING 19 115#define DHO_NON_LOCAL_SOURCE_ROUTING 20 116#define DHO_POLICY_FILTER 21 117#define DHO_MAX_DGRAM_REASSEMBLY 22 118#define DHO_DEFAULT_IP_TTL 23 119#define DHO_PATH_MTU_AGING_TIMEOUT 24 120#define DHO_PATH_MTU_PLATEAU_TABLE 25 121#define DHO_INTERFACE_MTU 26 122#define DHO_ALL_SUBNETS_LOCAL 27 123#define DHO_BROADCAST_ADDRESS 28 124#define DHO_PERFORM_MASK_DISCOVERY 29 125#define DHO_MASK_SUPPLIER 30 126#define DHO_ROUTER_DISCOVERY 31 127#define DHO_ROUTER_SOLICITATION_ADDRESS 32 128#define DHO_STATIC_ROUTES 33 129#define DHO_TRAILER_ENCAPSULATION 34 130#define DHO_ARP_CACHE_TIMEOUT 35 131#define DHO_IEEE802_3_ENCAPSULATION 36 132#define DHO_DEFAULT_TCP_TTL 37 133#define DHO_TCP_KEEPALIVE_INTERVAL 38 134#define DHO_TCP_KEEPALIVE_GARBAGE 39 135#define DHO_NIS_DOMAIN 40 136#define DHO_NIS_SERVERS 41 137#define DHO_NTP_SERVERS 42 138#define DHO_VENDOR_ENCAPSULATED_OPTIONS 43 139#define DHO_NETBIOS_NAME_SERVERS 44 140#define DHO_NETBIOS_DD_SERVER 45 141#define DHO_NETBIOS_NODE_TYPE 46 142#define DHO_NETBIOS_SCOPE 47 143#define DHO_FONT_SERVERS 48 144#define DHO_X_DISPLAY_MANAGER 49 145#define DHO_DHCP_REQUESTED_ADDRESS 50 146#define DHO_DHCP_LEASE_TIME 51 147#define DHO_DHCP_OPTION_OVERLOAD 52 148#define DHO_DHCP_MESSAGE_TYPE 53 149#define DHO_DHCP_SERVER_IDENTIFIER 54 150#define DHO_DHCP_PARAMETER_REQUEST_LIST 55 151#define DHO_DHCP_MESSAGE 56 152#define DHO_DHCP_MAX_MESSAGE_SIZE 57 153#define DHO_DHCP_RENEWAL_TIME 58 154#define DHO_DHCP_REBINDING_TIME 59 155#define DHO_DHCP_CLASS_IDENTIFIER 60 156#define DHO_DHCP_CLIENT_IDENTIFIER 61 157#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