1/* $OpenBSD: dhcp.h,v 1.5 2004/05/04 15:49:49 deraadt Exp $ */ 2/* $FreeBSD$ */ 3 4/* Protocol structures... */ 5 6/*- 7 * SPDX-License-Identifier: BSD-3-Clause 8 * 9 * Copyright (c) 1995, 1996 The Internet Software Consortium. 10 * All rights reserved. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 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. 24 * 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 37 * SUCH DAMAGE. 38 * 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''. 44 */ 45 46#define DHCP_UDP_OVERHEAD (14 + /* Ethernet header */ \ 47 20 + /* IP header */ \ 48 8) /* UDP 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) 56 57#define BOOTP_MIN_LEN 300 58#define DHCP_MIN_LEN 548 59 60struct dhcp_packet { 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). */ 78}; 79 80/* BOOTP (rfc951) message types */ 81#define BOOTREQUEST 1 82#define BOOTREPLY 2 83 84/* Possible values for flags field... */ 85#define BOOTP_BROADCAST 32768L 86 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... */ 91 92/* Magic cookie validating dhcp options field (and bootp vendor 93 extensions field). */ 94#define DHCP_OPTIONS_COOKIE "\143\202\123\143" 95 96/* DHCP Option codes: */ 97 98#define DHO_PAD 0 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 77 174#define DHO_URL 114 175#define DHO_DOMAIN_SEARCH 119 176#define DHO_CLASSLESS_ROUTES 121 177#define DHO_END 255 178 179/* DHCP message types. */ 180#define DHCPDISCOVER 1 181#define DHCPOFFER 2 182#define DHCPREQUEST 3 183#define DHCPDECLINE 4 184#define DHCPACK 5 185#define DHCPNAK 6 186#define DHCPRELEASE 7 187#define DHCPINFORM 8 188