dhcp.h

   1 /* dhcp.h
   2
   3    Protocol structures... */
   4
   5 /*
   6  * Copyright (c) 1995 The Internet Software Consortium.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of The Internet Software Consortium nor the names
  18  *    of its contributors may be used to endorse or promote products derived
  19  *    from this software without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
  22  * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
  23  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  24  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  25  * DISCLAIMED.  IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
  26  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  27  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  28  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  29  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  30  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  31  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  32  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  *
  35  * This software has been written for the Internet Software Consortium
  36  * by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
  37  * Enterprises.  To learn more about the Internet Software Consortium,
  38  * see ``http://www.vix.com/isc''.  To learn more about Vixie
  39  * Enterprises, see ``http://www.vix.com''.
  40  */
  41
  42 #define DHCP_UDP_OVERHEAD       (14 + /* Ethernet header */             \
  43                                  20 + /* IP header */                   \
  44                                  8)   /* UDP header */
  45 #define DHCP_SNAME_LEN          64
  46 #define DHCP_FILE_LEN           128
  47 #define DHCP_FIXED_LEN          (236 + DHCP_UDP_OVERHEAD) /* Everything but
  48                                                              options. */
  49 #define DHCP_MTU_MAX            1500
  50 #define DHCP_OPTION_LEN         (DHCP_MTU_MAX - DHCP_FIXED_LEN)
  51
  52 struct dhcp_packet {
  53         u_int8_t  op;           /* Message opcode/type */
  54         u_int8_t  htype;        /* Hardware addr type (see net/if_types.h) */
  55         u_int8_t  hlen;         /* Hardware addr length */
  56         u_int8_t  hops;         /* Number of relay agent hops from client */
  57         u_int32_t xid;          /* Transaction ID */
  58         u_int16_t secs;         /* Seconds since client started looking */
  59         u_int16_t flags;        /* Flag bits */
  60         struct in_addr ciaddr;  /* Client IP address (if already in use) */
  61         struct in_addr yiaddr;  /* Client IP address */
  62         struct in_addr siaddr;  /* IP address of next server to talk to */
  63         struct in_addr giaddr;  /* DHCP relay agent IP address */
  64         char chaddr [16];       /* Client hardware address */
  65         char sname [64];        /* Server name */
  66         char file [128];        /* Boot filename */
  67         char options [DHCP_OPTION_LEN]; /* Optional parameters
  68                                            (actual length dependent on MTU). */
  69 };
  70
  71 /* BOOTP (rfc951) message types */
  72 #define BOOTREQUEST     1
  73 #define BOOTREPLY       2
  74
  75 /* Possible values for flags field... */
  76 #define BOOTP_BROADCAST 32768L
  77
  78 /* Magic cookie validating dhcp options field (and bootp vendor
  79    extensions field). */
  80 #define DHCP_OPTIONS_COOKIE     "\143\202\123\143"
  81
  82 /* DHCP Option codes: */
  83
  84 #define DHO_PAD                         0
  85 #define DHO_SUBNET_MASK                 1
  86 #define DHO_TIME_OFFSET                 2
  87 #define DHO_ROUTERS                     3
  88 #define DHO_TIME_SERVERS                4
  89 #define DHO_NAME_SERVERS                5
  90 #define DHO_DOMAIN_NAME_SERVERS         6
  91 #define DHO_LOG_SERVERS                 7
  92 #define DHO_COOKIE_SERVERS              8
  93 #define DHO_LPR_SERVERS                 9
  94 #define DHO_IMPRESS_SERVERS             10
  95 #define DHO_RESOURCE_LOCATION_SERVERS   11
  96 #define DHO_HOST_NAME                   12
  97 #define DHO_BOOT_SIZE                   13
  98 #define DHO_MERIT_DUMP                  14
  99 #define DHO_DOMAIN_NAME                 15
 100 #define DHO_SWAP_SERVER                 16
 101 #define DHO_ROOT_PATH                   17
 102 #define DHO_EXTENSIONS_PATH             18
 103 #define DHO_IP_FORWARDING               19
 104 #define DHO_NON_LOCAL_SOURCE_ROUTING    20
 105 #define DHO_POLICY_FILTER               21
 106 #define DHO_MAX_DGRAM_REASSEMBLY        22
 107 #define DHO_DEFAULT_IP_TTL              23
 108 #define DHO_PATH_MTU_AGING_TIMEOUT      24
 109 #define DHO_PATH_MTU_PLATEAU_TABLE      25
 110 #define DHO_INTERFACE_MTU               26
 111 #define DHO_ALL_SUBNETS_LOCAL           27
 112 #define DHO_BROADCAST_ADDRESS           28
 113 #define DHO_PERFORM_MASK_DISCOVERY      29
 114 #define DHO_MASK_SUPPLIER               30
 115 #define DHO_ROUTER_DISCOVERY            31
 116 #define DHO_ROUTER_SOLICITATION_ADDRESS 32
 117 #define DHO_STATIC_ROUTES               33
 118 #define DHO_TRAILER_ENCAPSULATION       34
 119 #define DHO_ARP_CACHE_TIMEOUT           35
 120 #define DHO_IEEE802_3_ENCAPSULATION     36
 121 #define DHO_DEFAULT_TCP_TTL             37
 122 #define DHO_TCP_KEEPALIVE_INTERVAL      38
 123 #define DHO_TCP_KEEPALIVE_GARBAGE       39
 124 #define DHO_NIS_DOMAIN                  40
 125 #define DHO_NIS_SERVERS                 41
 126 #define DHO_NTP_SERVERS                 42
 127 #define DHO_VENDOR_ENCAPSULATED_OPTIONS 43
 128 #define DHO_NETBIOS_NAME_SERVERS        44
 129 #define DHO_NETBIOS_DD_SERVER           45
 130 #define DHO_NETBIOS_NODE_TYPE           46
 131 #define DHO_NETBIOS_SCOPE               47
 132 #define DHO_FONT_SERVERS                48
 133 #define DHO_X_DISPLAY_MANAGER           49
 134 #define DHO_DHCP_REQUESTED_ADDRESS      50
 135 #define DHO_DHCP_LEASE_TIME             51
 136 #define DHO_DHCP_OPTION_OVERLOAD        52
 137 #define DHO_DHCP_MESSAGE_TYPE           53
 138 #define DHO_DHCP_SERVER_IDENTIFIER      54
 139 #define DHO_DHCP_PARAMETER_REQUEST_LIST 55
 140 #define DHO_DHCP_MESSAGE                56
 141 #define DHO_DHCP_MAX_MESSAGE_SIZE       57
 142 #define DHO_DHCP_RENEWAL_TIME           58
 143 #define DHO_DHCP_REBINDING_TIME         59
 144 #define DHO_DHCP_CLASS_IDENTIFIER       60
 145 #define DHO_DHCP_CLIENT_IDENTIFIER      61
 146 #define DHO_END                         255
 147
 148 /* DHCP message types. */
 149 #define DHCPDISCOVER    1
 150 #define DHCPOFFER       2
 151 #define DHCPREQUEST     3
 152 #define DHCPDECLINE     4
 153 #define DHCPACK         5
 154 #define DHCPNAK         6
 155 #define DHCPRELEASE     7