1/* $OpenBSD: dhcp.h,v 1.5 2004/05/04 15:49:49 deraadt Exp $ */ 2 3/* Protocol structures... */ 4 5/*- 6 * SPDX-License-Identifier: BSD-3-Clause 7 * 8 * Copyright (c) 1995, 1996 The Internet Software Consortium. 9 * All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of The Internet Software Consortium nor the names 21 * of its contributors may be used to endorse or promote products derived 22 * from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND 25 * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 26 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 28 * DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR 29 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 32 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 33 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 34 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 35 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * This software has been written for the Internet Software Consortium 39 * by Ted Lemon <mellon@fugue.com> in cooperation with Vixie 40 * Enterprises. To learn more about the Internet Software Consortium, 41 * see ``http://www.vix.com/isc''. To learn more about Vixie 42 * Enterprises, see ``http://www.vix.com''. 43 */ 44 45#define DHCP_UDP_OVERHEAD (14 + /* Ethernet header */ \ 46 20 + /* IP header */ \ 47 8) /* UDP header */ 48#define DHCP_SNAME_LEN 64 49#define DHCP_FILE_LEN 128 50#define DHCP_FIXED_NON_UDP 236 51#define DHCP_FIXED_LEN (DHCP_FIXED_NON_UDP + DHCP_UDP_OVERHEAD) 52 /* Everything but options. */ 53#define DHCP_MTU_MAX 1500 54#define DHCP_OPTION_LEN (DHCP_MTU_MAX - DHCP_FIXED_LEN) 55 56#define BOOTP_MIN_LEN 300 57#define DHCP_MIN_LEN 548 58 59struct dhcp_packet { 60 u_int8_t op; /* Message opcode/type */ 61 u_int8_t htype; /* Hardware addr type (see net/if_types.h) */ 62 u_int8_t hlen; /* Hardware addr length */ 63 u_int8_t hops; /* Number of relay agent hops from client */ 64 u_int32_t xid; /* Transaction ID */ 65 u_int16_t secs; /* Seconds since client started looking */ 66 u_int16_t flags; /* Flag bits */ 67 struct in_addr ciaddr; /* Client IP address (if already in use) */ 68 struct in_addr yiaddr; /* Client IP address */ 69 struct in_addr siaddr; /* IP address of next server to talk to */ 70 struct in_addr giaddr; /* DHCP relay agent IP address */ 71 unsigned char chaddr[16]; /* Client hardware address */ 72 char sname[DHCP_SNAME_LEN]; /* Server name */ 73 char file[DHCP_FILE_LEN]; /* Boot filename */ 74 unsigned char options[DHCP_OPTION_LEN]; 75 /* Optional parameters 76 (actual length dependent on MTU). */ 77}; 78 79/* BOOTP (rfc951) message types */ 80#define BOOTREQUEST 1 81#define BOOTREPLY 2 82 83/* Possible values for flags field... */ 84#define BOOTP_BROADCAST 32768L 85 86/* Possible values for hardware type (htype) field... */ 87#define HTYPE_ETHER 1 /* Ethernet */ 88#define HTYPE_IEEE802 6 /* IEEE 802.2 Token Ring... */ 89#define HTYPE_FDDI 8 /* FDDI... */ 90 91/* Magic cookie validating dhcp options field (and bootp vendor 92 extensions field). */ 93#define DHCP_OPTIONS_COOKIE "\143\202\123\143" 94 95/* DHCP Option codes: */ 96 97#define DHO_PAD 0 98#define DHO_SUBNET_MASK 1 99#define DHO_TIME_OFFSET 2 100#define DHO_ROUTERS 3 101#define DHO_TIME_SERVERS 4 102#define DHO_NAME_SERVERS 5 103#define DHO_DOMAIN_NAME_SERVERS 6 104#define DHO_LOG_SERVERS 7 105#define DHO_COOKIE_SERVERS 8 106#define DHO_LPR_SERVERS 9 107#define DHO_IMPRESS_SERVERS 10 108#define DHO_RESOURCE_LOCATION_SERVERS 11 109#define DHO_HOST_NAME 12 110#define DHO_BOOT_SIZE 13 111#define DHO_MERIT_DUMP 14 112#define DHO_DOMAIN_NAME 15 113#define DHO_SWAP_SERVER 16 114#define DHO_ROOT_PATH 17 115#define DHO_EXTENSIONS_PATH 18 116#define DHO_IP_FORWARDING 19 117#define DHO_NON_LOCAL_SOURCE_ROUTING 20 118#define DHO_POLICY_FILTER 21 119#define DHO_MAX_DGRAM_REASSEMBLY 22 120#define DHO_DEFAULT_IP_TTL 23 121#define DHO_PATH_MTU_AGING_TIMEOUT 24 122#define DHO_PATH_MTU_PLATEAU_TABLE 25 123#define DHO_INTERFACE_MTU 26 124#define DHO_ALL_SUBNETS_LOCAL 27 125#define DHO_BROADCAST_ADDRESS 28 126#define DHO_PERFORM_MASK_DISCOVERY 29 127#define DHO_MASK_SUPPLIER 30 128#define DHO_ROUTER_DISCOVERY 31 129#define DHO_ROUTER_SOLICITATION_ADDRESS 32 130#define DHO_STATIC_ROUTES 33 131#define DHO_TRAILER_ENCAPSULATION 34 132#define DHO_ARP_CACHE_TIMEOUT 35 133#define DHO_IEEE802_3_ENCAPSULATION 36 134#define DHO_DEFAULT_TCP_TTL 37 135#define DHO_TCP_KEEPALIVE_INTERVAL 38 136#define DHO_TCP_KEEPALIVE_GARBAGE 39 137#define DHO_NIS_DOMAIN 40 138#define DHO_NIS_SERVERS 41 139#define DHO_NTP_SERVERS 42 140#define DHO_VENDOR_ENCAPSULATED_OPTIONS 43 141#define DHO_NETBIOS_NAME_SERVERS 44 142#define DHO_NETBIOS_DD_SERVER 45 143#define DHO_NETBIOS_NODE_TYPE 46 144#define DHO_NETBIOS_SCOPE 47 145#define DHO_FONT_SERVERS 48 146#define DHO_X_DISPLAY_MANAGER 49 147#define DHO_DHCP_REQUESTED_ADDRESS 50 148#define DHO_DHCP_LEASE_TIME 51 149#define DHO_DHCP_OPTION_OVERLOAD 52 150#define DHO_DHCP_MESSAGE_TYPE 53 151#define DHO_DHCP_SERVER_IDENTIFIER 54 152#define DHO_DHCP_PARAMETER_REQUEST_LIST 55 153#define DHO_DHCP_MESSAGE 56 154#define DHO_DHCP_MAX_MESSAGE_SIZE 57 155#define DHO_DHCP_RENEWAL_TIME 58 156#define DHO_DHCP_REBINDING_TIME 59 157#define DHO_DHCP_CLASS_IDENTIFIER 60 158#define DHO_DHCP_CLIENT_IDENTIFIER 61 159#define DHO_NISPLUS_DOMAIN 64 160#define DHO_NISPLUS_SERVERS 65 161#define DHO_TFTP_SERVER_NAME 66 162#define DHO_BOOTFILE_NAME 67 163#define DHO_MOBILE_IP_HOME_AGENT 68 164#define DHO_SMTP_SERVER 69 165#define DHO_POP_SERVER 70 166#define DHO_NNTP_SERVER 71 167#define DHO_WWW_SERVER 72 168#define DHO_FINGER_SERVER 73 169#define DHO_IRC_SERVER 74 170#define DHO_STREETTALK_SERVER 75 171#define DHO_STREETTALK_DA_SERVER 76 172#define DHO_DHCP_USER_CLASS_ID 77 173#define DHO_URL 114 174#define DHO_DOMAIN_SEARCH 119 175#define DHO_CLASSLESS_ROUTES 121 176#define DHO_END 255 177 178/* DHCP message types. */ 179#define DHCPDISCOVER 1 180#define DHCPOFFER 2 181#define DHCPREQUEST 3 182#define DHCPDECLINE 4 183#define DHCPACK 5 184#define DHCPNAK 6 185#define DHCPRELEASE 7 186#define DHCPINFORM 8 187