1 /* $NetBSD: dhcp.h,v 1.3 2022/04/03 01:10:58 christos Exp $ */ 2 3 /* dhcp.h 4 5 Protocol structures... */ 6 7 /* 8 * Copyright (C) 2004-2022 Internet Systems Consortium, Inc. ("ISC") 9 * Copyright (c) 1995-2003 by Internet Software Consortium 10 * 11 * This Source Code Form is subject to the terms of the Mozilla Public 12 * License, v. 2.0. If a copy of the MPL was not distributed with this 13 * file, You can obtain one at http://mozilla.org/MPL/2.0/. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 16 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 17 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 18 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 19 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 20 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 21 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 22 * 23 * Internet Systems Consortium, Inc. 24 * PO Box 360 25 * Newmarket, NH 03857 USA 26 * <info@isc.org> 27 * https://www.isc.org/ 28 * 29 */ 30 31 #ifndef DHCP_H 32 #define DHCP_H 33 34 #define DHCP_UDP_OVERHEAD (20 + /* IP header */ \ 35 8) /* UDP header */ 36 #define DHCP_SNAME_LEN 64 37 #define DHCP_FILE_LEN 128 38 #define DHCP_FIXED_NON_UDP 236 39 #define DHCP_FIXED_LEN (DHCP_FIXED_NON_UDP + DHCP_UDP_OVERHEAD) 40 /* Everything but options. */ 41 #define BOOTP_MIN_LEN 300 42 43 #define DHCP_MTU_MAX 1500 44 #define DHCP_MTU_MIN 576 45 46 #define DHCP_MAX_OPTION_LEN (DHCP_MTU_MAX - DHCP_FIXED_LEN) 47 #define DHCP_MIN_OPTION_LEN (DHCP_MTU_MIN - DHCP_FIXED_LEN) 48 49 struct dhcp_packet { 50 u_int8_t op; /* 0: Message opcode/type */ 51 u_int8_t htype; /* 1: Hardware addr type (net/if_types.h) */ 52 u_int8_t hlen; /* 2: Hardware addr length */ 53 u_int8_t hops; /* 3: Number of relay agent hops from client */ 54 u_int32_t xid; /* 4: Transaction ID */ 55 u_int16_t secs; /* 8: Seconds since client started looking */ 56 u_int16_t flags; /* 10: Flag bits */ 57 struct in_addr ciaddr; /* 12: Client IP address (if already in use) */ 58 struct in_addr yiaddr; /* 16: Client IP address */ 59 struct in_addr siaddr; /* 18: IP address of next server to talk to */ 60 struct in_addr giaddr; /* 20: DHCP relay agent IP address */ 61 unsigned char chaddr [16]; /* 24: Client hardware address */ 62 char sname [DHCP_SNAME_LEN]; /* 40: Server name */ 63 char file [DHCP_FILE_LEN]; /* 104: Boot filename */ 64 unsigned char options [DHCP_MAX_OPTION_LEN]; 65 /* 212: Optional parameters 66 (actual length dependent on MTU). */ 67 }; 68 69 /* BOOTP (rfc951) message types */ 70 #define BOOTREQUEST 1 71 #define BOOTREPLY 2 72 73 /* Possible values for flags field... */ 74 #define BOOTP_BROADCAST 32768L 75 76 /* Possible values for hardware type (htype) field... */ 77 #define HTYPE_ETHER 1 /* Ethernet 10Mbps */ 78 #define HTYPE_IEEE802 6 /* IEEE 802.2 Token Ring... */ 79 #define HTYPE_FDDI 8 /* FDDI... */ 80 #define HTYPE_INFINIBAND 32 /* IP over Infiniband */ 81 #define HTYPE_IPMP 255 /* IPMP - random hw address - there 82 * is no standard for this so we 83 * just steal a type */ 84 85 /* Magic cookie validating dhcp options field (and bootp vendor 86 extensions field). */ 87 #define DHCP_OPTIONS_COOKIE "\143\202\123\143" 88 89 /* DHCP Option codes: */ 90 91 #define DHO_PAD 0 92 #define DHO_SUBNET_MASK 1 93 #define DHO_TIME_OFFSET 2 94 #define DHO_ROUTERS 3 95 #define DHO_TIME_SERVERS 4 96 #define DHO_NAME_SERVERS 5 97 #define DHO_DOMAIN_NAME_SERVERS 6 98 #define DHO_LOG_SERVERS 7 99 #define DHO_COOKIE_SERVERS 8 100 #define DHO_LPR_SERVERS 9 101 #define DHO_IMPRESS_SERVERS 10 102 #define DHO_RESOURCE_LOCATION_SERVERS 11 103 #define DHO_HOST_NAME 12 104 #define DHO_BOOT_SIZE 13 105 #define DHO_MERIT_DUMP 14 106 #define DHO_DOMAIN_NAME 15 107 #define DHO_SWAP_SERVER 16 108 #define DHO_ROOT_PATH 17 109 #define DHO_EXTENSIONS_PATH 18 110 #define DHO_IP_FORWARDING 19 111 #define DHO_NON_LOCAL_SOURCE_ROUTING 20 112 #define DHO_POLICY_FILTER 21 113 #define DHO_MAX_DGRAM_REASSEMBLY 22 114 #define DHO_DEFAULT_IP_TTL 23 115 #define DHO_PATH_MTU_AGING_TIMEOUT 24 116 #define DHO_PATH_MTU_PLATEAU_TABLE 25 117 #define DHO_INTERFACE_MTU 26 118 #define DHO_ALL_SUBNETS_LOCAL 27 119 #define DHO_BROADCAST_ADDRESS 28 120 #define DHO_PERFORM_MASK_DISCOVERY 29 121 #define DHO_MASK_SUPPLIER 30 122 #define DHO_ROUTER_DISCOVERY 31 123 #define DHO_ROUTER_SOLICITATION_ADDRESS 32 124 #define DHO_STATIC_ROUTES 33 125 #define DHO_TRAILER_ENCAPSULATION 34 126 #define DHO_ARP_CACHE_TIMEOUT 35 127 #define DHO_IEEE802_3_ENCAPSULATION 36 128 #define DHO_DEFAULT_TCP_TTL 37 129 #define DHO_TCP_KEEPALIVE_INTERVAL 38 130 #define DHO_TCP_KEEPALIVE_GARBAGE 39 131 #define DHO_NIS_DOMAIN 40 132 #define DHO_NIS_SERVERS 41 133 #define DHO_NTP_SERVERS 42 134 #define DHO_VENDOR_ENCAPSULATED_OPTIONS 43 135 #define DHO_NETBIOS_NAME_SERVERS 44 136 #define DHO_NETBIOS_DD_SERVER 45 137 #define DHO_NETBIOS_NODE_TYPE 46 138 #define DHO_NETBIOS_SCOPE 47 139 #define DHO_FONT_SERVERS 48 140 #define DHO_X_DISPLAY_MANAGER 49 141 #define DHO_DHCP_REQUESTED_ADDRESS 50 142 #define DHO_DHCP_LEASE_TIME 51 143 #define DHO_DHCP_OPTION_OVERLOAD 52 144 #define DHO_DHCP_MESSAGE_TYPE 53 145 #define DHO_DHCP_SERVER_IDENTIFIER 54 146 #define DHO_DHCP_PARAMETER_REQUEST_LIST 55 147 #define DHO_DHCP_MESSAGE 56 148 #define DHO_DHCP_MAX_MESSAGE_SIZE 57 149 #define DHO_DHCP_RENEWAL_TIME 58 150 #define DHO_DHCP_REBINDING_TIME 59 151 #define DHO_VENDOR_CLASS_IDENTIFIER 60 152 #define DHO_DHCP_CLIENT_IDENTIFIER 61 153 #define DHO_NWIP_DOMAIN_NAME 62 154 #define DHO_NWIP_SUBOPTIONS 63 155 #define DHO_USER_CLASS 77 156 #define DHO_FQDN 81 157 #define DHO_DHCP_AGENT_OPTIONS 82 158 #define DHO_AUTHENTICATE 90 /* RFC3118, was 210 */ 159 #define DHO_CLIENT_LAST_TRANSACTION_TIME 91 160 #define DHO_ASSOCIATED_IP 92 161 #define DHO_V6_ONLY_PREFERRED 108 /* RFC8925 */ 162 #define DHO_SUBNET_SELECTION 118 /* RFC3011! */ 163 #define DHO_DOMAIN_SEARCH 119 /* RFC3397 */ 164 #define DHO_VIVCO_SUBOPTIONS 124 165 #define DHO_VIVSO_SUBOPTIONS 125 166 167 #define DHO_END 255 168 169 /* DHCP message types. */ 170 #define DHCPDISCOVER 1 171 #define DHCPOFFER 2 172 #define DHCPREQUEST 3 173 #define DHCPDECLINE 4 174 #define DHCPACK 5 175 #define DHCPNAK 6 176 #define DHCPRELEASE 7 177 #define DHCPINFORM 8 178 #define DHCPLEASEQUERY 10 179 #define DHCPLEASEUNASSIGNED 11 180 #define DHCPLEASEUNKNOWN 12 181 #define DHCPLEASEACTIVE 13 182 183 184 /* Relay Agent Information option subtypes: */ 185 #define RAI_CIRCUIT_ID 1 186 #define RAI_REMOTE_ID 2 187 #define RAI_AGENT_ID 3 188 #define RAI_LINK_SELECT 5 189 /* not yet assigned but next free value */ 190 #define RAI_RELAY_PORT 19 191 192 /* FQDN suboptions: */ 193 #define FQDN_NO_CLIENT_UPDATE 1 194 #define FQDN_SERVER_UPDATE 2 195 #define FQDN_ENCODED 3 196 #define FQDN_RCODE1 4 197 #define FQDN_RCODE2 5 198 #define FQDN_HOSTNAME 6 199 #define FQDN_DOMAINNAME 7 200 #define FQDN_FQDN 8 201 #define FQDN_SUBOPTION_COUNT 8 202 203 /* Enterprise Suboptions: */ 204 #define VENDOR_ISC_SUBOPTIONS 2495 205 206 #endif /* DHCP_H */ 207