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 58struct 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_NISPLUS_DOMAIN 64 159#define DHO_NISPLUS_SERVERS 65 160#define DHO_TFTP_SERVER_NAME 66 161#define DHO_BOOTFILE_NAME 67 162#define DHO_MOBILE_IP_HOME_AGENT 68 163#define DHO_SMTP_SERVER 69 164#define DHO_POP_SERVER 70 165#define DHO_NNTP_SERVER 71 166#define DHO_WWW_SERVER 72 167#define DHO_FINGER_SERVER 73 168#define DHO_IRC_SERVER 74 169#define DHO_STREETTALK_SERVER 75 170#define DHO_STREETTALK_DA_SERVER 76 171#define DHO_DHCP_USER_CLASS_ID 77 172#define DHO_DOMAIN_SEARCH 119 173#define DHO_CLASSLESS_ROUTES 121 174#define DHO_END 255 175 176/* DHCP message types. */ 177#define DHCPDISCOVER 1 178#define DHCPOFFER 2 179#define DHCPREQUEST 3 180#define DHCPDECLINE 4 181#define DHCPACK 5 182#define DHCPNAK 6 183#define DHCPRELEASE 7 184#define DHCPINFORM 8 185