[457] | 1 | /**
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| 2 | * @file
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| 3 | * DHCP protocol definitions
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (c) 2001-2004 Leon Woestenberg <leon.woestenberg@gmx.net>
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| 8 | * Copyright (c) 2001-2004 Axon Digital Design B.V., The Netherlands.
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| 9 | * All rights reserved.
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| 10 | *
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| 11 | * Redistribution and use in source and binary forms, with or without modification,
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| 12 | * are permitted provided that the following conditions are met:
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| 13 | *
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| 14 | * 1. Redistributions of source code must retain the above copyright notice,
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| 15 | * this list of conditions and the following disclaimer.
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| 16 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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| 17 | * this list of conditions and the following disclaimer in the documentation
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| 18 | * and/or other materials provided with the distribution.
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| 19 | * 3. The name of the author may not be used to endorse or promote products
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| 20 | * derived from this software without specific prior written permission.
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| 21 | *
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| 22 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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| 23 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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| 24 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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| 25 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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| 26 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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| 27 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 28 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 29 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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| 30 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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| 31 | * OF SUCH DAMAGE.
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| 32 | *
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| 33 | * This file is part of the lwIP TCP/IP stack.
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| 34 | *
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| 35 | * Author: Leon Woestenberg <leon.woestenberg@gmx.net>
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| 36 | *
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| 37 | */
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| 38 | #ifndef LWIP_HDR_PROT_DHCP_H
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| 39 | #define LWIP_HDR_PROT_DHCP_H
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| 40 |
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| 41 | #include "lwip/opt.h"
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| 42 | #include "lwip/arch.h"
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| 43 | #include "lwip/prot/ip4.h"
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| 44 |
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| 45 | #ifdef __cplusplus
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| 46 | extern "C" {
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| 47 | #endif
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| 48 |
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| 49 | /* DHCP message item offsets and length */
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| 50 | #define DHCP_CHADDR_LEN 16U
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| 51 | #define DHCP_SNAME_OFS 44U
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| 52 | #define DHCP_SNAME_LEN 64U
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| 53 | #define DHCP_FILE_OFS 108U
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| 54 | #define DHCP_FILE_LEN 128U
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| 55 | #define DHCP_MSG_LEN 236U
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| 56 | #define DHCP_OPTIONS_OFS (DHCP_MSG_LEN + 4U) /* 4 byte: cookie */
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| 57 |
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| 58 | #ifdef PACK_STRUCT_USE_INCLUDES
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| 59 | # include "arch/bpstruct.h"
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| 60 | #endif
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| 61 | PACK_STRUCT_BEGIN
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| 62 | /** minimum set of fields of any DHCP message */
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| 63 | struct dhcp_msg
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| 64 | {
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| 65 | PACK_STRUCT_FLD_8(u8_t op);
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| 66 | PACK_STRUCT_FLD_8(u8_t htype);
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| 67 | PACK_STRUCT_FLD_8(u8_t hlen);
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| 68 | PACK_STRUCT_FLD_8(u8_t hops);
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| 69 | PACK_STRUCT_FIELD(u32_t xid);
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| 70 | PACK_STRUCT_FIELD(u16_t secs);
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| 71 | PACK_STRUCT_FIELD(u16_t flags);
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| 72 | PACK_STRUCT_FLD_S(ip4_addr_p_t ciaddr);
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| 73 | PACK_STRUCT_FLD_S(ip4_addr_p_t yiaddr);
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| 74 | PACK_STRUCT_FLD_S(ip4_addr_p_t siaddr);
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| 75 | PACK_STRUCT_FLD_S(ip4_addr_p_t giaddr);
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| 76 | PACK_STRUCT_FLD_8(u8_t chaddr[DHCP_CHADDR_LEN]);
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| 77 | PACK_STRUCT_FLD_8(u8_t sname[DHCP_SNAME_LEN]);
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| 78 | PACK_STRUCT_FLD_8(u8_t file[DHCP_FILE_LEN]);
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| 79 | PACK_STRUCT_FIELD(u32_t cookie);
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| 80 | #define DHCP_MIN_OPTIONS_LEN 68U
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| 81 | /** make sure user does not configure this too small */
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| 82 | #if ((defined(DHCP_OPTIONS_LEN)) && (DHCP_OPTIONS_LEN < DHCP_MIN_OPTIONS_LEN))
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| 83 | # undef DHCP_OPTIONS_LEN
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| 84 | #endif
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| 85 | /** allow this to be configured in lwipopts.h, but not too small */
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| 86 | #if (!defined(DHCP_OPTIONS_LEN))
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| 87 | /** set this to be sufficient for your options in outgoing DHCP msgs */
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| 88 | # define DHCP_OPTIONS_LEN DHCP_MIN_OPTIONS_LEN
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| 89 | #endif
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| 90 | PACK_STRUCT_FLD_8(u8_t options[DHCP_OPTIONS_LEN]);
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| 91 | } PACK_STRUCT_STRUCT;
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| 92 | PACK_STRUCT_END
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| 93 | #ifdef PACK_STRUCT_USE_INCLUDES
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| 94 | # include "arch/epstruct.h"
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| 95 | #endif
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| 96 |
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| 97 |
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| 98 | /* DHCP client states */
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| 99 | typedef enum {
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| 100 | DHCP_STATE_OFF = 0,
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| 101 | DHCP_STATE_REQUESTING = 1,
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| 102 | DHCP_STATE_INIT = 2,
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| 103 | DHCP_STATE_REBOOTING = 3,
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| 104 | DHCP_STATE_REBINDING = 4,
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| 105 | DHCP_STATE_RENEWING = 5,
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| 106 | DHCP_STATE_SELECTING = 6,
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| 107 | DHCP_STATE_INFORMING = 7,
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| 108 | DHCP_STATE_CHECKING = 8,
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| 109 | DHCP_STATE_PERMANENT = 9, /* not yet implemented */
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| 110 | DHCP_STATE_BOUND = 10,
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| 111 | DHCP_STATE_RELEASING = 11, /* not yet implemented */
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| 112 | DHCP_STATE_BACKING_OFF = 12
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| 113 | } dhcp_state_enum_t;
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| 114 |
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| 115 | /* DHCP op codes */
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| 116 | #define DHCP_BOOTREQUEST 1
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| 117 | #define DHCP_BOOTREPLY 2
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| 118 |
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| 119 | /* DHCP message types */
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| 120 | #define DHCP_DISCOVER 1
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| 121 | #define DHCP_OFFER 2
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| 122 | #define DHCP_REQUEST 3
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| 123 | #define DHCP_DECLINE 4
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| 124 | #define DHCP_ACK 5
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| 125 | #define DHCP_NAK 6
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| 126 | #define DHCP_RELEASE 7
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| 127 | #define DHCP_INFORM 8
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| 128 |
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| 129 | #define DHCP_MAGIC_COOKIE 0x63825363UL
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| 130 |
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| 131 | /* This is a list of options for BOOTP and DHCP, see RFC 2132 for descriptions */
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| 132 |
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| 133 | /* BootP options */
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| 134 | #define DHCP_OPTION_PAD 0
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| 135 | #define DHCP_OPTION_SUBNET_MASK 1 /* RFC 2132 3.3 */
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| 136 | #define DHCP_OPTION_ROUTER 3
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| 137 | #define DHCP_OPTION_DNS_SERVER 6
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| 138 | #define DHCP_OPTION_HOSTNAME 12
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| 139 | #define DHCP_OPTION_IP_TTL 23
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| 140 | #define DHCP_OPTION_MTU 26
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| 141 | #define DHCP_OPTION_BROADCAST 28
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| 142 | #define DHCP_OPTION_TCP_TTL 37
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| 143 | #define DHCP_OPTION_NTP 42
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| 144 | #define DHCP_OPTION_END 255
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| 145 |
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| 146 | /* DHCP options */
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| 147 | #define DHCP_OPTION_REQUESTED_IP 50 /* RFC 2132 9.1, requested IP address */
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| 148 | #define DHCP_OPTION_LEASE_TIME 51 /* RFC 2132 9.2, time in seconds, in 4 bytes */
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| 149 | #define DHCP_OPTION_OVERLOAD 52 /* RFC2132 9.3, use file and/or sname field for options */
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| 150 |
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| 151 | #define DHCP_OPTION_MESSAGE_TYPE 53 /* RFC 2132 9.6, important for DHCP */
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| 152 | #define DHCP_OPTION_MESSAGE_TYPE_LEN 1
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| 153 |
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| 154 | #define DHCP_OPTION_SERVER_ID 54 /* RFC 2132 9.7, server IP address */
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| 155 | #define DHCP_OPTION_PARAMETER_REQUEST_LIST 55 /* RFC 2132 9.8, requested option types */
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| 156 |
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| 157 | #define DHCP_OPTION_MAX_MSG_SIZE 57 /* RFC 2132 9.10, message size accepted >= 576 */
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| 158 | #define DHCP_OPTION_MAX_MSG_SIZE_LEN 2
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| 159 |
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| 160 | #define DHCP_OPTION_T1 58 /* T1 renewal time */
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| 161 | #define DHCP_OPTION_T2 59 /* T2 rebinding time */
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| 162 | #define DHCP_OPTION_US 60
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| 163 | #define DHCP_OPTION_CLIENT_ID 61
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| 164 | #define DHCP_OPTION_TFTP_SERVERNAME 66
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| 165 | #define DHCP_OPTION_BOOTFILE 67
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| 166 |
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| 167 | /* possible combinations of overloading the file and sname fields with options */
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| 168 | #define DHCP_OVERLOAD_NONE 0
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| 169 | #define DHCP_OVERLOAD_FILE 1
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| 170 | #define DHCP_OVERLOAD_SNAME 2
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| 171 | #define DHCP_OVERLOAD_SNAME_FILE 3
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| 172 |
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| 173 |
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| 174 | #ifdef __cplusplus
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| 175 | }
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| 176 | #endif
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| 177 |
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| 178 | #endif /* LWIP_HDR_PROT_DHCP_H */
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