1/* $OpenBSD: dhcp.h,v 1.11 2019/05/08 22:00:55 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 55struct 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_IPSEC_TUNNEL 31 /* IPsec Tunnel (RFC3456) */ 85 86/* Magic cookie validating dhcp options field (and bootp vendor 87 extensions field). */ 88#define DHCP_OPTIONS_COOKIE "\143\202\123\143" 89#define DHCP_OPTIONS_COOKIE_LEN 4 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_NISPLUS_DOMAIN 64 157#define DHO_NISPLUS_SERVERS 65 158#define DHO_TFTP_SERVER 66 159#define DHO_BOOTFILE_NAME 67 160#define DHO_MOBILE_IP_HOME_AGENT 68 161#define DHO_SMTP_SERVER 69 162#define DHO_POP_SERVER 70 163#define DHO_NNTP_SERVER 71 164#define DHO_WWW_SERVER 72 165#define DHO_FINGER_SERVER 73 166#define DHO_IRC_SERVER 74 167#define DHO_STREETTALK_SERVER 75 168#define DHO_STREETTALK_DIRECTORY_ASSISTANCE_SERVER 76 169#define DHO_DHCP_USER_CLASS_ID 77 170#define DHO_RELAY_AGENT_INFORMATION 82 171#define DHO_NDS_SERVERS 85 172#define DHO_NDS_TREE_NAME 86 173#define DHO_NDS_CONTEXT 87 174#define DHO_DOMAIN_SEARCH 119 175#define DHO_CLASSLESS_STATIC_ROUTES 121 176#define DHO_TFTP_CONFIG_FILE 144 177#define DHO_VOIP_CONFIGURATION_SERVER 150 178#define DHO_CLASSLESS_MS_STATIC_ROUTES 249 179#define DHO_AUTOPROXY_SCRIPT 252 180#define DHO_END 255 181 182/* DHCP message types. */ 183#define DHCPDISCOVER 1 184#define DHCPOFFER 2 185#define DHCPREQUEST 3 186#define DHCPDECLINE 4 187#define DHCPACK 5 188#define DHCPNAK 6 189#define DHCPRELEASE 7 190#define DHCPINFORM 8 191 192/* Relay Agent Information sub-options */ 193#define RAI_CIRCUIT_ID 1 194#define RAI_REMOTE_ID 2 195#define RAI_AGENT_ID 3 196