sbin/dhclient/dhcp.h

   1 /*      $OpenBSD: src/sbin/dhclient/dhcp.h,v 1.9 2011/05/11 14:38:36 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
  55 struct 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_IEEE802   6               /* IEEE 802.2 Token Ring...     */
  85 #define HTYPE_FDDI      8               /* FDDI...                      */
  86
  87 /* Magic cookie validating dhcp options field (and bootp vendor
  88    extensions field). */
  89 #define DHCP_OPTIONS_COOKIE             "\143\202\123\143"
  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_TFTP_SERVER                 66
 157 #define DHO_DHCP_USER_CLASS_ID          77
 158 #define DHO_END                         255
 159
 160 /* DHCP message types. */
 161 #define DHCPDISCOVER    1
 162 #define DHCPOFFER       2
 163 #define DHCPREQUEST     3
 164 #define DHCPDECLINE     4
 165 #define DHCPACK         5
 166 #define DHCPNAK         6
 167 #define DHCPRELEASE     7
 168 #define DHCPINFORM      8