minix/lib/liblwip/dist/src/include/lwip/prot/dhcp.h

   1 /**
   2  * @file
   3  * DHCP protocol definitions
   4  */
   5
   6 /*
   7  * Copyright (c) 2001-2004 Leon Woestenberg <leon.woestenberg@gmx.net>
   8  * Copyright (c) 2001-2004 Axon Digital Design B.V., The Netherlands.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without modification,
  12  * are permitted provided that the following conditions are met:
  13  *
  14  * 1. Redistributions of source code must retain the above copyright notice,
  15  *    this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright notice,
  17  *    this list of conditions and the following disclaimer in the documentation
  18  *    and/or other materials provided with the distribution.
  19  * 3. The name of the author may not be used to endorse or promote products
  20  *    derived from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
  23  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  24  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
  25  * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  26  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
  27  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  28  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  29  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  30  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
  31  * OF SUCH DAMAGE.
  32  *
  33  * This file is part of the lwIP TCP/IP stack.
  34  *
  35  * Author: Leon Woestenberg <leon.woestenberg@gmx.net>
  36  *
  37  */
  38 #ifndef LWIP_HDR_PROT_DHCP_H
  39 #define LWIP_HDR_PROT_DHCP_H
  40
  41 #include "lwip/opt.h"
  42
  43 #ifdef __cplusplus
  44 extern "C" {
  45 #endif
  46
  47 #define DHCP_CLIENT_PORT  68
  48 #define DHCP_SERVER_PORT  67
  49
  50
  51  /* DHCP message item offsets and length */
  52 #define DHCP_CHADDR_LEN   16U
  53 #define DHCP_SNAME_OFS    44U
  54 #define DHCP_SNAME_LEN    64U
  55 #define DHCP_FILE_OFS     108U
  56 #define DHCP_FILE_LEN     128U
  57 #define DHCP_MSG_LEN      236U
  58 #define DHCP_OPTIONS_OFS  (DHCP_MSG_LEN + 4U) /* 4 byte: cookie */
  59
  60 #ifdef PACK_STRUCT_USE_INCLUDES
  61 #  include "arch/bpstruct.h"
  62 #endif
  63 PACK_STRUCT_BEGIN
  64 /** minimum set of fields of any DHCP message */
  65 struct dhcp_msg
  66 {
  67   PACK_STRUCT_FLD_8(u8_t op);
  68   PACK_STRUCT_FLD_8(u8_t htype);
  69   PACK_STRUCT_FLD_8(u8_t hlen);
  70   PACK_STRUCT_FLD_8(u8_t hops);
  71   PACK_STRUCT_FIELD(u32_t xid);
  72   PACK_STRUCT_FIELD(u16_t secs);
  73   PACK_STRUCT_FIELD(u16_t flags);
  74   PACK_STRUCT_FLD_S(ip4_addr_p_t ciaddr);
  75   PACK_STRUCT_FLD_S(ip4_addr_p_t yiaddr);
  76   PACK_STRUCT_FLD_S(ip4_addr_p_t siaddr);
  77   PACK_STRUCT_FLD_S(ip4_addr_p_t giaddr);
  78   PACK_STRUCT_FLD_8(u8_t chaddr[DHCP_CHADDR_LEN]);
  79   PACK_STRUCT_FLD_8(u8_t sname[DHCP_SNAME_LEN]);
  80   PACK_STRUCT_FLD_8(u8_t file[DHCP_FILE_LEN]);
  81   PACK_STRUCT_FIELD(u32_t cookie);
  82 #define DHCP_MIN_OPTIONS_LEN 68U
  83 /** make sure user does not configure this too small */
  84 #if ((defined(DHCP_OPTIONS_LEN)) && (DHCP_OPTIONS_LEN < DHCP_MIN_OPTIONS_LEN))
  85 #  undef DHCP_OPTIONS_LEN
  86 #endif
  87 /** allow this to be configured in lwipopts.h, but not too small */
  88 #if (!defined(DHCP_OPTIONS_LEN))
  89 /** set this to be sufficient for your options in outgoing DHCP msgs */
  90 #  define DHCP_OPTIONS_LEN DHCP_MIN_OPTIONS_LEN
  91 #endif
  92   PACK_STRUCT_FLD_8(u8_t options[DHCP_OPTIONS_LEN]);
  93 } PACK_STRUCT_STRUCT;
  94 PACK_STRUCT_END
  95 #ifdef PACK_STRUCT_USE_INCLUDES
  96 #  include "arch/epstruct.h"
  97 #endif
  98
  99
 100 /* DHCP client states */
 101 typedef enum {
 102   DHCP_STATE_OFF             = 0,
 103   DHCP_STATE_REQUESTING      = 1,
 104   DHCP_STATE_INIT            = 2,
 105   DHCP_STATE_REBOOTING       = 3,
 106   DHCP_STATE_REBINDING       = 4,
 107   DHCP_STATE_RENEWING        = 5,
 108   DHCP_STATE_SELECTING       = 6,
 109   DHCP_STATE_INFORMING       = 7,
 110   DHCP_STATE_CHECKING        = 8,
 111   DHCP_STATE_PERMANENT       = 9,  /* not yet implemented */
 112   DHCP_STATE_BOUND           = 10,
 113   DHCP_STATE_RELEASING       = 11, /* not yet implemented */
 114   DHCP_STATE_BACKING_OFF     = 12
 115 } dhcp_state_enum_t;
 116
 117 /* DHCP op codes */
 118 #define DHCP_BOOTREQUEST            1
 119 #define DHCP_BOOTREPLY              2
 120
 121 /* DHCP message types */
 122 #define DHCP_DISCOVER               1
 123 #define DHCP_OFFER                  2
 124 #define DHCP_REQUEST                3
 125 #define DHCP_DECLINE                4
 126 #define DHCP_ACK                    5
 127 #define DHCP_NAK                    6
 128 #define DHCP_RELEASE                7
 129 #define DHCP_INFORM                 8
 130
 131 /** DHCP hardware type, currently only ethernet is supported */
 132 #define DHCP_HTYPE_ETH              1
 133
 134 #define DHCP_MAGIC_COOKIE           0x63825363UL
 135
 136 /* This is a list of options for BOOTP and DHCP, see RFC 2132 for descriptions */
 137
 138 /* BootP options */
 139 #define DHCP_OPTION_PAD             0
 140 #define DHCP_OPTION_SUBNET_MASK     1 /* RFC 2132 3.3 */
 141 #define DHCP_OPTION_ROUTER          3
 142 #define DHCP_OPTION_DNS_SERVER      6
 143 #define DHCP_OPTION_HOSTNAME        12
 144 #define DHCP_OPTION_IP_TTL          23
 145 #define DHCP_OPTION_MTU             26
 146 #define DHCP_OPTION_BROADCAST       28
 147 #define DHCP_OPTION_TCP_TTL         37
 148 #define DHCP_OPTION_NTP             42
 149 #define DHCP_OPTION_END             255
 150
 151 /* DHCP options */
 152 #define DHCP_OPTION_REQUESTED_IP    50 /* RFC 2132 9.1, requested IP address */
 153 #define DHCP_OPTION_LEASE_TIME      51 /* RFC 2132 9.2, time in seconds, in 4 bytes */
 154 #define DHCP_OPTION_OVERLOAD        52 /* RFC2132 9.3, use file and/or sname field for options */
 155
 156 #define DHCP_OPTION_MESSAGE_TYPE    53 /* RFC 2132 9.6, important for DHCP */
 157 #define DHCP_OPTION_MESSAGE_TYPE_LEN 1
 158
 159 #define DHCP_OPTION_SERVER_ID       54 /* RFC 2132 9.7, server IP address */
 160 #define DHCP_OPTION_PARAMETER_REQUEST_LIST  55 /* RFC 2132 9.8, requested option types */
 161
 162 #define DHCP_OPTION_MAX_MSG_SIZE    57 /* RFC 2132 9.10, message size accepted >= 576 */
 163 #define DHCP_OPTION_MAX_MSG_SIZE_LEN 2
 164
 165 #define DHCP_OPTION_T1              58 /* T1 renewal time */
 166 #define DHCP_OPTION_T2              59 /* T2 rebinding time */
 167 #define DHCP_OPTION_US              60
 168 #define DHCP_OPTION_CLIENT_ID       61
 169 #define DHCP_OPTION_TFTP_SERVERNAME 66
 170 #define DHCP_OPTION_BOOTFILE        67
 171
 172 /* possible combinations of overloading the file and sname fields with options */
 173 #define DHCP_OVERLOAD_NONE          0
 174 #define DHCP_OVERLOAD_FILE          1
 175 #define DHCP_OVERLOAD_SNAME         2
 176 #define DHCP_OVERLOAD_SNAME_FILE    3
 177
 178
 179 #ifdef __cplusplus
 180 }
 181 #endif
 182
 183 #endif /*LWIP_HDR_PROT_DHCP_H*/