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83cbd279 | 1 | /** @file\r |
3e8c18da | 2 | To validate, parse and process the DHCP options.\r |
d1102dba LG |
3 | \r |
4 | Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r | |
9d510e61 | 5 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
83cbd279 | 6 | \r |
83cbd279 | 7 | **/\r |
8 | \r | |
9 | #ifndef __EFI_DHCP4_OPTION_H__\r | |
10 | #define __EFI_DHCP4_OPTION_H__\r | |
11 | \r | |
f9204641 | 12 | ///\r |
13 | /// DHCP option tags (types)\r | |
14 | ///\r | |
f6b7393c | 15 | \r |
f6b7393c | 16 | #define DHCP_OPTION_MAGIC 0x63538263 // Network byte order\r |
17 | #define DHCP_MAX_OPTIONS 256\r | |
18 | \r | |
d1102dba | 19 | \r |
f6b7393c | 20 | //\r |
21 | // DHCP option types, this is used to validate the DHCP options.\r | |
22 | //\r | |
23 | #define DHCP_OPTION_SWITCH 1\r | |
24 | #define DHCP_OPTION_INT8 2\r | |
25 | #define DHCP_OPTION_INT16 3\r | |
26 | #define DHCP_OPTION_INT32 4\r | |
27 | #define DHCP_OPTION_IP 5\r | |
28 | #define DHCP_OPTION_IPPAIR 6\r | |
29 | \r | |
30 | //\r | |
31 | // Value of DHCP overload option\r | |
32 | //\r | |
33 | #define DHCP_OVERLOAD_FILENAME 1\r | |
34 | #define DHCP_OVERLOAD_SVRNAME 2\r | |
35 | #define DHCP_OVERLOAD_BOTH 3\r | |
83cbd279 | 36 | \r |
f9204641 | 37 | ///\r |
38 | /// The DHCP option structure. This structure extends the EFI_DHCP_OPTION\r | |
39 | /// structure to support options longer than 255 bytes, such as classless route.\r | |
40 | ///\r | |
83cbd279 | 41 | typedef struct {\r |
42 | UINT8 Tag;\r | |
43 | UINT16 Len;\r | |
44 | UINT8 *Data;\r | |
45 | } DHCP_OPTION;\r | |
46 | \r | |
f9204641 | 47 | ///\r |
48 | /// Structures used to parse the DHCP options with RFC3396 support.\r | |
49 | ///\r | |
83cbd279 | 50 | typedef struct {\r |
51 | UINT8 Index;\r | |
52 | UINT16 Offset;\r | |
53 | } DHCP_OPTION_COUNT;\r | |
54 | \r | |
55 | typedef struct {\r | |
56 | DHCP_OPTION_COUNT *OpCount;\r | |
57 | DHCP_OPTION *Options;\r | |
58 | UINT8 *Buf;\r | |
59 | } DHCP_OPTION_CONTEXT;\r | |
60 | \r | |
f9204641 | 61 | ///\r |
62 | /// The options that matters to DHCP driver itself. The user of\r | |
63 | /// DHCP clients may be interested in other options, such as\r | |
64 | /// classless route, who can parse the DHCP offer to get them.\r | |
65 | ///\r | |
83cbd279 | 66 | typedef struct {\r |
ac6c3d90 ZL |
67 | IP4_ADDR NetMask; // DHCP4_TAG_NETMASK\r |
68 | IP4_ADDR Router; // DHCP4_TAG_ROUTER, only the first router is used\r | |
83cbd279 | 69 | \r |
70 | //\r | |
71 | // DHCP specific options\r | |
72 | //\r | |
ac6c3d90 ZL |
73 | UINT8 DhcpType; // DHCP4_TAG_MSG_TYPE\r |
74 | UINT8 Overload; // DHCP4_TAG_OVERLOAD\r | |
75 | IP4_ADDR ServerId; // DHCP4_TAG_SERVER_ID\r | |
76 | UINT32 Lease; // DHCP4_TAG_LEASE\r | |
77 | UINT32 T1; // DHCP4_TAG_T1\r | |
78 | UINT32 T2; // DHCP4_TAG_T2\r | |
83cbd279 | 79 | } DHCP_PARAMETER;\r |
80 | \r | |
f9204641 | 81 | ///\r |
82 | /// Structure used to describe and validate the format of DHCP options.\r | |
83 | /// Type is the options' data type, such as DHCP_OPTION_INT8. MinOccur\r | |
84 | /// is the minium occurance of this data type. MaxOccur is defined\r | |
85 | /// similarly. If MaxOccur is -1, it means that there is no limit on the\r | |
86 | /// maximum occurance. Alert tells whether DHCP client should further\r | |
87 | /// inspect the option to parse DHCP_PARAMETER.\r | |
88 | ///\r | |
83cbd279 | 89 | typedef struct {\r |
90 | UINT8 Tag;\r | |
91 | INTN Type;\r | |
92 | INTN MinOccur;\r | |
93 | INTN MaxOccur;\r | |
94 | BOOLEAN Alert;\r | |
95 | } DHCP_OPTION_FORMAT;\r | |
96 | \r | |
97 | typedef\r | |
98 | EFI_STATUS\r | |
99 | (*DHCP_CHECK_OPTION) (\r | |
100 | IN UINT8 Tag,\r | |
101 | IN UINT8 Len,\r | |
102 | IN UINT8 *Data,\r | |
103 | IN VOID *Context\r | |
104 | );\r | |
105 | \r | |
7bce0c5a | 106 | /**\r |
107 | Iterate through a DHCP message to visit each option. First inspect\r | |
108 | all the options in the OPTION field. Then if overloaded, inspect\r | |
109 | the options in FILENAME and SERVERNAME fields. One option may be\r | |
110 | encoded in several places. See RFC 3396 Encoding Long Options in DHCP\r | |
111 | \r | |
3e8c18da | 112 | @param[in] Packet The DHCP packet to check the options for\r |
113 | @param[in] Check The callback function to be called for each option\r | |
114 | found\r | |
115 | @param[in] Context The opaque parameter for Check\r | |
7bce0c5a | 116 | \r |
117 | @retval EFI_SUCCESS The DHCP packet's options are well formated\r | |
ed729a0c | 118 | @retval EFI_INVALID_PARAMETER The DHCP packet's options are not well formated\r |
7bce0c5a | 119 | \r |
120 | **/\r | |
83cbd279 | 121 | EFI_STATUS\r |
122 | DhcpIterateOptions (\r | |
123 | IN EFI_DHCP4_PACKET *Packet,\r | |
24af132f | 124 | IN DHCP_CHECK_OPTION Check OPTIONAL,\r |
83cbd279 | 125 | IN VOID *Context\r |
126 | );\r | |
127 | \r | |
7bce0c5a | 128 | /**\r |
129 | Validate the packet's options. If necessary, allocate\r | |
130 | and fill in the interested parameters.\r | |
131 | \r | |
3e8c18da | 132 | @param[in] Packet The packet to validate the options\r |
133 | @param[out] Para The variable to save the DHCP parameters.\r | |
7bce0c5a | 134 | \r |
135 | @retval EFI_OUT_OF_RESOURCES Failed to allocate memory to validate the packet.\r | |
136 | @retval EFI_INVALID_PARAMETER The options are mal-formated\r | |
137 | @retval EFI_SUCCESS The options are parsed into OptionPoint\r | |
138 | \r | |
139 | **/\r | |
83cbd279 | 140 | EFI_STATUS\r |
141 | DhcpValidateOptions (\r | |
142 | IN EFI_DHCP4_PACKET *Packet,\r | |
ed729a0c | 143 | OUT DHCP_PARAMETER **Para OPTIONAL\r |
83cbd279 | 144 | );\r |
145 | \r | |
7bce0c5a | 146 | /**\r |
147 | Parse the options of a DHCP packet. It supports RFC 3396: Encoding\r | |
148 | Long Options in DHCP. That is, it will combine all the option value\r | |
149 | of all the occurances of each option.\r | |
150 | A little bit of implemenation:\r | |
151 | It adopts the "Key indexed counting" algorithm. First, it allocates\r | |
152 | an array of 256 DHCP_OPTION_COUNTs because DHCP option tag is encoded\r | |
153 | as a UINT8. It then iterates the DHCP packet to get data length of\r | |
154 | each option by calling DhcpIterOptions with DhcpGetOptionLen. Now, it\r | |
155 | knows the number of present options and their length. It allocates a\r | |
ed729a0c | 156 | array of DHCP_OPTION and a continuous buffer after the array to put\r |
7bce0c5a | 157 | all the options' data. Each option's data is pointed to by the Data\r |
158 | field in DHCP_OPTION structure. At last, it call DhcpIterateOptions\r | |
159 | with DhcpFillOption to fill each option's data to its position in the\r | |
160 | buffer.\r | |
161 | \r | |
3e8c18da | 162 | @param[in] Packet The DHCP packet to parse the options\r |
163 | @param[out] Count The number of valid dhcp options present in the\r | |
164 | packet\r | |
165 | @param[out] OptionPoint The array that contains the DHCP options. Caller\r | |
166 | should free it.\r | |
7bce0c5a | 167 | \r |
7b0ae7e8 | 168 | @retval EFI_NOT_FOUND Cannot find any option.\r |
7bce0c5a | 169 | @retval EFI_OUT_OF_RESOURCES Failed to allocate memory to parse the packet.\r |
170 | @retval EFI_INVALID_PARAMETER The options are mal-formated\r | |
171 | @retval EFI_SUCCESS The options are parsed into OptionPoint\r | |
172 | \r | |
173 | **/\r | |
83cbd279 | 174 | EFI_STATUS\r |
175 | DhcpParseOption (\r | |
176 | IN EFI_DHCP4_PACKET *Packet,\r | |
177 | OUT INTN *Count,\r | |
178 | OUT DHCP_OPTION **OptionPoint\r | |
179 | );\r | |
180 | \r | |
7bce0c5a | 181 | /**\r |
182 | Append an option to the memory, if the option is longer than\r | |
183 | 255 bytes, splits it into several options.\r | |
184 | \r | |
3e8c18da | 185 | @param[out] Buf The buffer to append the option to\r |
186 | @param[in] Tag The option's tag\r | |
187 | @param[in] DataLen The length of the option's data\r | |
188 | @param[in] Data The option's data\r | |
7bce0c5a | 189 | \r |
190 | @return The position to append the next option\r | |
191 | \r | |
192 | **/\r | |
83cbd279 | 193 | UINT8 *\r |
194 | DhcpAppendOption (\r | |
ed729a0c | 195 | OUT UINT8 *Buf,\r |
196 | IN UINT8 Tag,\r | |
197 | IN UINT16 DataLen,\r | |
198 | IN UINT8 *Data\r | |
83cbd279 | 199 | );\r |
200 | \r | |
7bce0c5a | 201 | /**\r |
202 | Build a new DHCP packet from a seed packet. Options may be deleted or\r | |
203 | appended. The caller should free the NewPacket when finished using it.\r | |
204 | \r | |
3e8c18da | 205 | @param[in] SeedPacket The seed packet to start with\r |
206 | @param[in] DeleteCount The number of options to delete\r | |
207 | @param[in] DeleteList The options to delete from the packet\r | |
208 | @param[in] AppendCount The number of options to append\r | |
209 | @param[in] AppendList The options to append to the packet\r | |
210 | @param[out] NewPacket The new packet, allocated and built by this\r | |
211 | function.\r | |
7bce0c5a | 212 | \r |
213 | @retval EFI_OUT_OF_RESOURCES Failed to allocate memory\r | |
ed729a0c | 214 | @retval EFI_INVALID_PARAMETER The options in SeekPacket are mal-formated\r |
7bce0c5a | 215 | @retval EFI_SUCCESS The packet is build.\r |
216 | \r | |
217 | **/\r | |
83cbd279 | 218 | EFI_STATUS\r |
219 | DhcpBuild (\r | |
ed729a0c | 220 | IN EFI_DHCP4_PACKET *SeedPacket,\r |
221 | IN UINT32 DeleteCount,\r | |
222 | IN UINT8 *DeleteList OPTIONAL,\r | |
223 | IN UINT32 AppendCount,\r | |
224 | IN EFI_DHCP4_PACKET_OPTION *AppendList[] OPTIONAL,\r | |
225 | OUT EFI_DHCP4_PACKET **NewPacket\r | |
83cbd279 | 226 | );\r |
227 | \r | |
228 | #endif\r |