1 /* $OpenBSD: dhcp.h,v 1.6 2016/12/12 15:41:05 rzalamena 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 /* The option/sub-option maximum length. */ 53 #define DHCP_OPTION_MAXLEN 255 54 /* The option/sub-option header length. */ 55 #define DHCP_OPTION_HDR_LEN 2 56 57 #define BOOTP_MIN_LEN 300 58 59 struct 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 #define HTYPE_IPSEC_TUNNEL 31 /* IPsec Tunnel (RFC3456) */ 91 92 /* Magic cookie validating dhcp options field (and bootp vendor 93 extensions field). */ 94 #define DHCP_OPTIONS_COOKIE "\143\202\123\143" 95 #define DHCP_OPTIONS_COOKIE_LEN 4 96 97 /* DHCP Option codes: */ 98 99 #define DHO_PAD 0 100 #define DHO_SUBNET_MASK 1 101 #define DHO_TIME_OFFSET 2 102 #define DHO_ROUTERS 3 103 #define DHO_TIME_SERVERS 4 104 #define DHO_NAME_SERVERS 5 105 #define DHO_DOMAIN_NAME_SERVERS 6 106 #define DHO_LOG_SERVERS 7 107 #define DHO_COOKIE_SERVERS 8 108 #define DHO_LPR_SERVERS 9 109 #define DHO_IMPRESS_SERVERS 10 110 #define DHO_RESOURCE_LOCATION_SERVERS 11 111 #define DHO_HOST_NAME 12 112 #define DHO_BOOT_SIZE 13 113 #define DHO_MERIT_DUMP 14 114 #define DHO_DOMAIN_NAME 15 115 #define DHO_SWAP_SERVER 16 116 #define DHO_ROOT_PATH 17 117 #define DHO_EXTENSIONS_PATH 18 118 #define DHO_IP_FORWARDING 19 119 #define DHO_NON_LOCAL_SOURCE_ROUTING 20 120 #define DHO_POLICY_FILTER 21 121 #define DHO_MAX_DGRAM_REASSEMBLY 22 122 #define DHO_DEFAULT_IP_TTL 23 123 #define DHO_PATH_MTU_AGING_TIMEOUT 24 124 #define DHO_PATH_MTU_PLATEAU_TABLE 25 125 #define DHO_INTERFACE_MTU 26 126 #define DHO_ALL_SUBNETS_LOCAL 27 127 #define DHO_BROADCAST_ADDRESS 28 128 #define DHO_PERFORM_MASK_DISCOVERY 29 129 #define DHO_MASK_SUPPLIER 30 130 #define DHO_ROUTER_DISCOVERY 31 131 #define DHO_ROUTER_SOLICITATION_ADDRESS 32 132 #define DHO_STATIC_ROUTES 33 133 #define DHO_TRAILER_ENCAPSULATION 34 134 #define DHO_ARP_CACHE_TIMEOUT 35 135 #define DHO_IEEE802_3_ENCAPSULATION 36 136 #define DHO_DEFAULT_TCP_TTL 37 137 #define DHO_TCP_KEEPALIVE_INTERVAL 38 138 #define DHO_TCP_KEEPALIVE_GARBAGE 39 139 #define DHO_NIS_DOMAIN 40 140 #define DHO_NIS_SERVERS 41 141 #define DHO_NTP_SERVERS 42 142 #define DHO_VENDOR_ENCAPSULATED_OPTIONS 43 143 #define DHO_NETBIOS_NAME_SERVERS 44 144 #define DHO_NETBIOS_DD_SERVER 45 145 #define DHO_NETBIOS_NODE_TYPE 46 146 #define DHO_NETBIOS_SCOPE 47 147 #define DHO_FONT_SERVERS 48 148 #define DHO_X_DISPLAY_MANAGER 49 149 #define DHO_DHCP_REQUESTED_ADDRESS 50 150 #define DHO_DHCP_LEASE_TIME 51 151 #define DHO_DHCP_OPTION_OVERLOAD 52 152 #define DHO_DHCP_MESSAGE_TYPE 53 153 #define DHO_DHCP_SERVER_IDENTIFIER 54 154 #define DHO_DHCP_PARAMETER_REQUEST_LIST 55 155 #define DHO_DHCP_MESSAGE 56 156 #define DHO_DHCP_MAX_MESSAGE_SIZE 57 157 #define DHO_DHCP_RENEWAL_TIME 58 158 #define DHO_DHCP_REBINDING_TIME 59 159 #define DHO_DHCP_CLASS_IDENTIFIER 60 160 #define DHO_DHCP_CLIENT_IDENTIFIER 61 161 #define DHO_DHCP_USER_CLASS_ID 77 162 #define DHO_RELAY_AGENT_INFORMATION 82 163 #define DHO_END 255 164 165 /* DHCP message types. */ 166 #define DHCPDISCOVER 1 167 #define DHCPOFFER 2 168 #define DHCPREQUEST 3 169 #define DHCPDECLINE 4 170 #define DHCPACK 5 171 #define DHCPNAK 6 172 #define DHCPRELEASE 7 173 #define DHCPINFORM 8 174 175 /* Relay Agent Information sub-options */ 176 #define RAI_CIRCUIT_ID 1 177 #define RAI_REMOTE_ID 2 178 #define RAI_AGENT_ID 3 179