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Commit | Line | Data |
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772db4bb | 1 | /** @file\r |
3e8c18da | 2 | Function to validate, parse, 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 |
772db4bb | 6 | \r |
772db4bb | 7 | **/\r |
8 | \r | |
9 | #include "Dhcp4Impl.h"\r | |
10 | \r | |
f9204641 | 11 | ///\r |
12 | /// A list of the format of DHCP Options sorted by option tag\r | |
13 | /// to validate a dhcp message. Refere the comments of the\r | |
14 | /// DHCP_OPTION_FORMAT structure.\r | |
15 | ///\r | |
d1050b9d MK |
16 | DHCP_OPTION_FORMAT DhcpOptionFormats[] = {\r |
17 | { DHCP4_TAG_NETMASK, DHCP_OPTION_IP, 1, 1, TRUE },\r | |
18 | { DHCP4_TAG_TIME_OFFSET, DHCP_OPTION_INT32, 1, 1, FALSE },\r | |
19 | { DHCP4_TAG_ROUTER, DHCP_OPTION_IP, 1, -1, TRUE },\r | |
20 | { DHCP4_TAG_TIME_SERVER, DHCP_OPTION_IP, 1, -1, FALSE },\r | |
21 | { DHCP4_TAG_NAME_SERVER, DHCP_OPTION_IP, 1, -1, FALSE },\r | |
22 | { DHCP4_TAG_DNS_SERVER, DHCP_OPTION_IP, 1, -1, FALSE },\r | |
23 | { DHCP4_TAG_LOG_SERVER, DHCP_OPTION_IP, 1, -1, FALSE },\r | |
24 | { DHCP4_TAG_COOKIE_SERVER, DHCP_OPTION_IP, 1, -1, FALSE },\r | |
25 | { DHCP4_TAG_LPR_SERVER, DHCP_OPTION_IP, 1, -1, FALSE },\r | |
26 | { DHCP4_TAG_IMPRESS_SERVER, DHCP_OPTION_IP, 1, -1, FALSE },\r | |
27 | { DHCP4_TAG_RL_SERVER, DHCP_OPTION_IP, 1, -1, FALSE },\r | |
28 | { DHCP4_TAG_HOSTNAME, DHCP_OPTION_INT8, 1, -1, FALSE },\r | |
29 | { DHCP4_TAG_BOOTFILE_LEN, DHCP_OPTION_INT16, 1, 1, FALSE },\r | |
30 | { DHCP4_TAG_DUMP, DHCP_OPTION_INT8, 1, -1, FALSE },\r | |
31 | { DHCP4_TAG_DOMAINNAME, DHCP_OPTION_INT8, 1, -1, FALSE },\r | |
32 | { DHCP4_TAG_SWAP_SERVER, DHCP_OPTION_IP, 1, 1, FALSE },\r | |
33 | { DHCP4_TAG_ROOTPATH, DHCP_OPTION_INT8, 1, -1, FALSE },\r | |
34 | { DHCP4_TAG_EXTEND_PATH, DHCP_OPTION_INT8, 1, -1, FALSE },\r | |
35 | \r | |
36 | { DHCP4_TAG_IPFORWARD, DHCP_OPTION_SWITCH, 1, 1, FALSE },\r | |
37 | { DHCP4_TAG_NONLOCAL_SRR, DHCP_OPTION_SWITCH, 1, 1, FALSE },\r | |
38 | { DHCP4_TAG_POLICY_SRR, DHCP_OPTION_IPPAIR, 1, -1, FALSE },\r | |
39 | { DHCP4_TAG_EMTU, DHCP_OPTION_INT16, 1, 1, FALSE },\r | |
40 | { DHCP4_TAG_TTL, DHCP_OPTION_INT8, 1, 1, FALSE },\r | |
41 | { DHCP4_TAG_PATHMTU_AGE, DHCP_OPTION_INT32, 1, 1, FALSE },\r | |
42 | { DHCP4_TAG_PATHMTU_PLATEAU, DHCP_OPTION_INT16, 1, -1, FALSE },\r | |
43 | \r | |
44 | { DHCP4_TAG_IFMTU, DHCP_OPTION_INT16, 1, 1, FALSE },\r | |
45 | { DHCP4_TAG_SUBNET_LOCAL, DHCP_OPTION_SWITCH, 1, 1, FALSE },\r | |
46 | { DHCP4_TAG_BROADCAST, DHCP_OPTION_IP, 1, 1, FALSE },\r | |
47 | { DHCP4_TAG_DISCOVER_MASK, DHCP_OPTION_SWITCH, 1, 1, FALSE },\r | |
48 | { DHCP4_TAG_SUPPLY_MASK, DHCP_OPTION_SWITCH, 1, 1, FALSE },\r | |
49 | { DHCP4_TAG_DISCOVER_ROUTE, DHCP_OPTION_SWITCH, 1, 1, FALSE },\r | |
50 | { DHCP4_TAG_ROUTER_SOLICIT, DHCP_OPTION_IP, 1, 1, FALSE },\r | |
51 | { DHCP4_TAG_STATIC_ROUTE, DHCP_OPTION_IPPAIR, 1, -1, FALSE },\r | |
52 | \r | |
53 | { DHCP4_TAG_TRAILER, DHCP_OPTION_SWITCH, 1, 1, FALSE },\r | |
54 | { DHCP4_TAG_ARPAGE, DHCP_OPTION_INT32, 1, 1, FALSE },\r | |
55 | { DHCP4_TAG_ETHER_ENCAP, DHCP_OPTION_SWITCH, 1, 1, FALSE },\r | |
56 | \r | |
57 | { DHCP4_TAG_TCP_TTL, DHCP_OPTION_INT8, 1, 1, FALSE },\r | |
58 | { DHCP4_TAG_KEEP_INTERVAL, DHCP_OPTION_INT32, 1, 1, FALSE },\r | |
59 | { DHCP4_TAG_KEEP_GARBAGE, DHCP_OPTION_SWITCH, 1, 1, FALSE },\r | |
60 | \r | |
61 | { DHCP4_TAG_NIS_DOMAIN, DHCP_OPTION_INT8, 1, -1, FALSE },\r | |
62 | { DHCP4_TAG_NIS_SERVER, DHCP_OPTION_IP, 1, -1, FALSE },\r | |
63 | { DHCP4_TAG_NTP_SERVER, DHCP_OPTION_IP, 1, -1, FALSE },\r | |
64 | { DHCP4_TAG_VENDOR, DHCP_OPTION_INT8, 1, -1, FALSE },\r | |
65 | { DHCP4_TAG_NBNS, DHCP_OPTION_IP, 1, -1, FALSE },\r | |
66 | { DHCP4_TAG_NBDD, DHCP_OPTION_IP, 1, -1, FALSE },\r | |
67 | { DHCP4_TAG_NBTYPE, DHCP_OPTION_INT8, 1, 1, FALSE },\r | |
68 | { DHCP4_TAG_NBSCOPE, DHCP_OPTION_INT8, 1, -1, FALSE },\r | |
69 | { DHCP4_TAG_XFONT, DHCP_OPTION_IP, 1, -1, FALSE },\r | |
70 | { DHCP4_TAG_XDM, DHCP_OPTION_IP, 1, -1, FALSE },\r | |
71 | \r | |
72 | { DHCP4_TAG_REQUEST_IP, DHCP_OPTION_IP, 1, 1, FALSE },\r | |
73 | { DHCP4_TAG_LEASE, DHCP_OPTION_INT32, 1, 1, TRUE },\r | |
74 | { DHCP4_TAG_OVERLOAD, DHCP_OPTION_INT8, 1, 1, TRUE },\r | |
75 | { DHCP4_TAG_MSG_TYPE, DHCP_OPTION_INT8, 1, 1, TRUE },\r | |
76 | { DHCP4_TAG_SERVER_ID, DHCP_OPTION_IP, 1, 1, TRUE },\r | |
77 | { DHCP4_TAG_PARA_LIST, DHCP_OPTION_INT8, 1, -1, FALSE },\r | |
78 | { DHCP4_TAG_MESSAGE, DHCP_OPTION_INT8, 1, -1, FALSE },\r | |
79 | { DHCP4_TAG_MAXMSG, DHCP_OPTION_INT16, 1, 1, FALSE },\r | |
80 | { DHCP4_TAG_T1, DHCP_OPTION_INT32, 1, 1, TRUE },\r | |
81 | { DHCP4_TAG_T2, DHCP_OPTION_INT32, 1, 1, TRUE },\r | |
82 | { DHCP4_TAG_VENDOR_CLASS_ID, DHCP_OPTION_INT8, 1, -1, FALSE },\r | |
83 | { DHCP4_TAG_CLIENT_ID, DHCP_OPTION_INT8, 2, -1, FALSE },\r | |
84 | \r | |
85 | { DHCP4_TAG_NISPLUS, DHCP_OPTION_INT8, 1, -1, FALSE },\r | |
86 | { DHCP4_TAG_NISPLUS_SERVER, DHCP_OPTION_IP, 1, -1, FALSE },\r | |
87 | \r | |
88 | { DHCP4_TAG_TFTP, DHCP_OPTION_INT8, 1, -1, FALSE },\r | |
89 | { DHCP4_TAG_BOOTFILE, DHCP_OPTION_INT8, 1, -1, FALSE },\r | |
90 | \r | |
91 | { DHCP4_TAG_MOBILEIP, DHCP_OPTION_IP, 0, -1, FALSE },\r | |
92 | { DHCP4_TAG_SMTP, DHCP_OPTION_IP, 1, -1, FALSE },\r | |
93 | { DHCP4_TAG_POP3, DHCP_OPTION_IP, 1, -1, FALSE },\r | |
94 | { DHCP4_TAG_NNTP, DHCP_OPTION_IP, 1, -1, FALSE },\r | |
95 | { DHCP4_TAG_WWW, DHCP_OPTION_IP, 1, -1, FALSE },\r | |
96 | { DHCP4_TAG_FINGER, DHCP_OPTION_IP, 1, -1, FALSE },\r | |
97 | { DHCP4_TAG_IRC, DHCP_OPTION_IP, 1, -1, FALSE },\r | |
98 | { DHCP4_TAG_STTALK, DHCP_OPTION_IP, 1, -1, FALSE },\r | |
99 | { DHCP4_TAG_STDA, DHCP_OPTION_IP, 1, -1, FALSE },\r | |
100 | \r | |
101 | { DHCP4_TAG_CLASSLESS_ROUTE, DHCP_OPTION_INT8, 5, -1, FALSE },\r | |
772db4bb | 102 | };\r |
103 | \r | |
772db4bb | 104 | /**\r |
105 | Binary search the DhcpOptionFormats array to find the format\r | |
106 | information about a specific option.\r | |
107 | \r | |
3e8c18da | 108 | @param[in] Tag The option's tag.\r |
772db4bb | 109 | \r |
110 | @return The point to the option's format, NULL if not found.\r | |
111 | \r | |
112 | **/\r | |
772db4bb | 113 | DHCP_OPTION_FORMAT *\r |
114 | DhcpFindOptionFormat (\r | |
d1050b9d | 115 | IN UINT8 Tag\r |
772db4bb | 116 | )\r |
117 | {\r | |
d1050b9d MK |
118 | INTN Left;\r |
119 | INTN Right;\r | |
120 | INTN Middle;\r | |
772db4bb | 121 | \r |
122 | Left = 0;\r | |
123 | Right = sizeof (DhcpOptionFormats) / sizeof (DHCP_OPTION_FORMAT) - 1;\r | |
124 | \r | |
125 | while (Right >= Left) {\r | |
126 | Middle = (Left + Right) / 2;\r | |
127 | \r | |
128 | if (Tag == DhcpOptionFormats[Middle].Tag) {\r | |
129 | return &DhcpOptionFormats[Middle];\r | |
130 | }\r | |
131 | \r | |
132 | if (Tag < DhcpOptionFormats[Middle].Tag) {\r | |
133 | Right = Middle - 1;\r | |
134 | } else {\r | |
d1050b9d | 135 | Left = Middle + 1;\r |
772db4bb | 136 | }\r |
137 | }\r | |
138 | \r | |
139 | return NULL;\r | |
140 | }\r | |
141 | \r | |
772db4bb | 142 | /**\r |
143 | Validate whether a single DHCP option is valid according to its format.\r | |
144 | \r | |
3e8c18da | 145 | @param[in] Format The option's format\r |
146 | @param[in] OptValue The value of the option\r | |
147 | @param[in] Len The length of the option value\r | |
772db4bb | 148 | \r |
f9204641 | 149 | @retval TRUE The option is valid.\r |
150 | @retval FALSE Otherwise.\r | |
772db4bb | 151 | \r |
152 | **/\r | |
772db4bb | 153 | BOOLEAN\r |
154 | DhcpOptionIsValid (\r | |
d1050b9d MK |
155 | IN DHCP_OPTION_FORMAT *Format,\r |
156 | IN UINT8 *OptValue,\r | |
157 | IN INTN Len\r | |
772db4bb | 158 | )\r |
159 | {\r | |
d1050b9d MK |
160 | INTN Unit;\r |
161 | INTN Occur;\r | |
162 | INTN Index;\r | |
772db4bb | 163 | \r |
164 | Unit = 0;\r | |
165 | \r | |
166 | switch (Format->Type) {\r | |
d1050b9d MK |
167 | case DHCP_OPTION_SWITCH:\r |
168 | case DHCP_OPTION_INT8:\r | |
169 | Unit = 1;\r | |
170 | break;\r | |
772db4bb | 171 | \r |
d1050b9d MK |
172 | case DHCP_OPTION_INT16:\r |
173 | Unit = 2;\r | |
174 | break;\r | |
772db4bb | 175 | \r |
d1050b9d MK |
176 | case DHCP_OPTION_INT32:\r |
177 | case DHCP_OPTION_IP:\r | |
178 | Unit = 4;\r | |
179 | break;\r | |
772db4bb | 180 | \r |
d1050b9d MK |
181 | case DHCP_OPTION_IPPAIR:\r |
182 | Unit = 8;\r | |
183 | break;\r | |
772db4bb | 184 | }\r |
185 | \r | |
186 | ASSERT (Unit != 0);\r | |
187 | \r | |
188 | //\r | |
189 | // Validate that the option appears in the full units.\r | |
190 | //\r | |
191 | if ((Len % Unit) != 0) {\r | |
192 | return FALSE;\r | |
193 | }\r | |
194 | \r | |
195 | //\r | |
c194ccca | 196 | // Validate the occurrence of the option unit is with in [MinOccur, MaxOccur]\r |
772db4bb | 197 | //\r |
198 | Occur = Len / Unit;\r | |
199 | \r | |
200 | if (((Format->MinOccur != -1) && (Occur < Format->MinOccur)) ||\r | |
f9204641 | 201 | ((Format->MaxOccur != -1) && (Occur > Format->MaxOccur))\r |
d1050b9d MK |
202 | )\r |
203 | {\r | |
772db4bb | 204 | return FALSE;\r |
205 | }\r | |
206 | \r | |
207 | //\r | |
208 | // If the option is of type switch, only 0/1 are valid values.\r | |
209 | //\r | |
210 | if (Format->Type == DHCP_OPTION_SWITCH) {\r | |
211 | for (Index = 0; Index < Occur; Index++) {\r | |
212 | if ((OptValue[Index] != 0) && (OptValue[Index] != 1)) {\r | |
213 | return FALSE;\r | |
214 | }\r | |
215 | }\r | |
216 | }\r | |
217 | \r | |
218 | return TRUE;\r | |
219 | }\r | |
220 | \r | |
772db4bb | 221 | /**\r |
222 | Extract the client interested options, all the parameters are\r | |
223 | converted to host byte order.\r | |
224 | \r | |
3e8c18da | 225 | @param[in] Tag The DHCP option tag\r |
226 | @param[in] Len The length of the option\r | |
227 | @param[in] Data The value of the DHCP option\r | |
228 | @param[out] Para The variable to save the interested parameter\r | |
772db4bb | 229 | \r |
230 | @retval EFI_SUCCESS The DHCP option is successfully extracted.\r | |
c194ccca | 231 | @retval EFI_INVALID_PARAMETER The DHCP option is mal-formatted\r |
772db4bb | 232 | \r |
233 | **/\r | |
772db4bb | 234 | EFI_STATUS\r |
235 | DhcpGetParameter (\r | |
d1050b9d MK |
236 | IN UINT8 Tag,\r |
237 | IN INTN Len,\r | |
238 | IN UINT8 *Data,\r | |
239 | OUT DHCP_PARAMETER *Para\r | |
772db4bb | 240 | )\r |
241 | {\r | |
242 | switch (Tag) {\r | |
d1050b9d MK |
243 | case DHCP4_TAG_NETMASK:\r |
244 | Para->NetMask = NetGetUint32 (Data);\r | |
245 | break;\r | |
772db4bb | 246 | \r |
d1050b9d MK |
247 | case DHCP4_TAG_ROUTER:\r |
248 | //\r | |
249 | // Return the first router to consumer which is the preferred one\r | |
250 | //\r | |
251 | Para->Router = NetGetUint32 (Data);\r | |
252 | break;\r | |
772db4bb | 253 | \r |
d1050b9d MK |
254 | case DHCP4_TAG_LEASE:\r |
255 | Para->Lease = NetGetUint32 (Data);\r | |
256 | break;\r | |
772db4bb | 257 | \r |
d1050b9d MK |
258 | case DHCP4_TAG_OVERLOAD:\r |
259 | Para->Overload = *Data;\r | |
772db4bb | 260 | \r |
d1050b9d MK |
261 | if ((Para->Overload < 1) || (Para->Overload > 3)) {\r |
262 | return EFI_INVALID_PARAMETER;\r | |
263 | }\r | |
772db4bb | 264 | \r |
d1050b9d | 265 | break;\r |
772db4bb | 266 | \r |
d1050b9d MK |
267 | case DHCP4_TAG_MSG_TYPE:\r |
268 | Para->DhcpType = *Data;\r | |
269 | \r | |
270 | if ((Para->DhcpType < 1) || (Para->DhcpType > 9)) {\r | |
271 | return EFI_INVALID_PARAMETER;\r | |
272 | }\r | |
772db4bb | 273 | \r |
d1050b9d | 274 | break;\r |
772db4bb | 275 | \r |
d1050b9d MK |
276 | case DHCP4_TAG_SERVER_ID:\r |
277 | Para->ServerId = NetGetUint32 (Data);\r | |
278 | break;\r | |
772db4bb | 279 | \r |
d1050b9d MK |
280 | case DHCP4_TAG_T1:\r |
281 | Para->T1 = NetGetUint32 (Data);\r | |
282 | break;\r | |
283 | \r | |
284 | case DHCP4_TAG_T2:\r | |
285 | Para->T2 = NetGetUint32 (Data);\r | |
286 | break;\r | |
772db4bb | 287 | }\r |
288 | \r | |
289 | return EFI_SUCCESS;\r | |
290 | }\r | |
291 | \r | |
772db4bb | 292 | /**\r |
293 | Inspect all the options in a single buffer. DHCP options may be contained\r | |
294 | in several buffers, such as the BOOTP options filed, boot file or server\r | |
ac6c3d90 | 295 | name. Each option buffer is required to end with DHCP4_TAG_EOP.\r |
772db4bb | 296 | \r |
3e8c18da | 297 | @param[in] Buffer The buffer which contains DHCP options\r |
298 | @param[in] BufLen The length of the buffer\r | |
299 | @param[in] Check The callback function for each option found\r | |
300 | @param[in] Context The opaque parameter for the Check\r | |
ac6c3d90 | 301 | @param[out] Overload Variable to save the value of DHCP4_TAG_OVERLOAD\r |
3e8c18da | 302 | option.\r |
772db4bb | 303 | \r |
304 | @retval EFI_SUCCESS All the options are valid\r | |
c194ccca | 305 | @retval EFI_INVALID_PARAMETER The options are mal-formatted.\r |
772db4bb | 306 | \r |
307 | **/\r | |
772db4bb | 308 | EFI_STATUS\r |
309 | DhcpIterateBufferOptions (\r | |
d1050b9d MK |
310 | IN UINT8 *Buffer,\r |
311 | IN INTN BufLen,\r | |
312 | IN DHCP_CHECK_OPTION Check OPTIONAL,\r | |
313 | IN VOID *Context,\r | |
314 | OUT UINT8 *Overload OPTIONAL\r | |
772db4bb | 315 | )\r |
316 | {\r | |
d1050b9d MK |
317 | INTN Cur;\r |
318 | UINT8 Tag;\r | |
319 | UINT8 Len;\r | |
772db4bb | 320 | \r |
321 | Cur = 0;\r | |
322 | \r | |
323 | while (Cur < BufLen) {\r | |
324 | Tag = Buffer[Cur];\r | |
325 | \r | |
ac6c3d90 | 326 | if (Tag == DHCP4_TAG_PAD) {\r |
772db4bb | 327 | Cur++;\r |
328 | continue;\r | |
ac6c3d90 | 329 | } else if (Tag == DHCP4_TAG_EOP) {\r |
772db4bb | 330 | return EFI_SUCCESS;\r |
331 | }\r | |
332 | \r | |
333 | Cur++;\r | |
334 | \r | |
335 | if (Cur == BufLen) {\r | |
336 | return EFI_INVALID_PARAMETER;\r | |
337 | }\r | |
338 | \r | |
339 | Len = Buffer[Cur++];\r | |
340 | \r | |
341 | if (Cur + Len > BufLen) {\r | |
342 | return EFI_INVALID_PARAMETER;\r | |
343 | }\r | |
344 | \r | |
ac6c3d90 | 345 | if ((Tag == DHCP4_TAG_OVERLOAD) && (Overload != NULL)) {\r |
772db4bb | 346 | if (Len != 1) {\r |
347 | return EFI_INVALID_PARAMETER;\r | |
348 | }\r | |
349 | \r | |
350 | *Overload = Buffer[Cur];\r | |
351 | }\r | |
352 | \r | |
353 | if ((Check != NULL) && EFI_ERROR (Check (Tag, Len, Buffer + Cur, Context))) {\r | |
354 | return EFI_INVALID_PARAMETER;\r | |
355 | }\r | |
356 | \r | |
357 | Cur += Len;\r | |
358 | }\r | |
359 | \r | |
360 | //\r | |
361 | // Each option buffer is expected to end with an EOP\r | |
362 | //\r | |
363 | return EFI_INVALID_PARAMETER;\r | |
364 | }\r | |
365 | \r | |
772db4bb | 366 | /**\r |
367 | Iterate through a DHCP message to visit each option. First inspect\r | |
368 | all the options in the OPTION field. Then if overloaded, inspect\r | |
369 | the options in FILENAME and SERVERNAME fields. One option may be\r | |
370 | encoded in several places. See RFC 3396 Encoding Long Options in DHCP\r | |
371 | \r | |
3e8c18da | 372 | @param[in] Packet The DHCP packet to check the options for\r |
373 | @param[in] Check The callback function to be called for each option\r | |
374 | found\r | |
375 | @param[in] Context The opaque parameter for Check\r | |
772db4bb | 376 | \r |
c194ccca AC |
377 | @retval EFI_SUCCESS The DHCP packet's options are well formatted\r |
378 | @retval EFI_INVALID_PARAMETER The DHCP packet's options are not well formatted\r | |
772db4bb | 379 | \r |
380 | **/\r | |
381 | EFI_STATUS\r | |
382 | DhcpIterateOptions (\r | |
d1050b9d MK |
383 | IN EFI_DHCP4_PACKET *Packet,\r |
384 | IN DHCP_CHECK_OPTION Check OPTIONAL,\r | |
385 | IN VOID *Context\r | |
772db4bb | 386 | )\r |
387 | {\r | |
d1050b9d MK |
388 | EFI_STATUS Status;\r |
389 | UINT8 Overload;\r | |
772db4bb | 390 | \r |
391 | Overload = 0;\r | |
392 | \r | |
d1050b9d MK |
393 | Status = DhcpIterateBufferOptions (\r |
394 | Packet->Dhcp4.Option,\r | |
395 | Packet->Length - sizeof (EFI_DHCP4_HEADER) - sizeof (UINT32),\r | |
396 | Check,\r | |
397 | Context,\r | |
398 | &Overload\r | |
399 | );\r | |
772db4bb | 400 | \r |
401 | if (EFI_ERROR (Status)) {\r | |
402 | return Status;\r | |
403 | }\r | |
404 | \r | |
405 | if ((Overload == DHCP_OVERLOAD_FILENAME) || (Overload == DHCP_OVERLOAD_BOTH)) {\r | |
406 | Status = DhcpIterateBufferOptions (\r | |
d1050b9d | 407 | (UINT8 *)Packet->Dhcp4.Header.BootFileName,\r |
772db4bb | 408 | 128,\r |
409 | Check,\r | |
410 | Context,\r | |
411 | NULL\r | |
412 | );\r | |
413 | \r | |
414 | if (EFI_ERROR (Status)) {\r | |
415 | return Status;\r | |
416 | }\r | |
417 | }\r | |
418 | \r | |
419 | if ((Overload == DHCP_OVERLOAD_SVRNAME) || (Overload == DHCP_OVERLOAD_BOTH)) {\r | |
420 | Status = DhcpIterateBufferOptions (\r | |
d1050b9d | 421 | (UINT8 *)Packet->Dhcp4.Header.ServerName,\r |
772db4bb | 422 | 64,\r |
423 | Check,\r | |
424 | Context,\r | |
425 | NULL\r | |
426 | );\r | |
427 | \r | |
428 | if (EFI_ERROR (Status)) {\r | |
429 | return Status;\r | |
430 | }\r | |
431 | }\r | |
432 | \r | |
433 | return EFI_SUCCESS;\r | |
434 | }\r | |
435 | \r | |
772db4bb | 436 | /**\r |
f9204641 | 437 | Call back function to DhcpIterateOptions to compute each option's\r |
c194ccca | 438 | length. It just adds the data length of all the occurrences of this\r |
772db4bb | 439 | Tag. Context is an array of 256 DHCP_OPTION_COUNT.\r |
440 | \r | |
3e8c18da | 441 | @param[in] Tag The current option to check\r |
442 | @param[in] Len The length of the option data\r | |
443 | @param[in] Data The option data\r | |
444 | @param[in] Context The context, which is a array of 256\r | |
445 | DHCP_OPTION_COUNT.\r | |
772db4bb | 446 | \r |
447 | @retval EFI_SUCCESS It always returns EFI_SUCCESS.\r | |
448 | \r | |
449 | **/\r | |
772db4bb | 450 | EFI_STATUS\r |
451 | DhcpGetOptionLen (\r | |
d1050b9d MK |
452 | IN UINT8 Tag,\r |
453 | IN UINT8 Len,\r | |
454 | IN UINT8 *Data,\r | |
455 | IN VOID *Context\r | |
772db4bb | 456 | )\r |
457 | {\r | |
d1050b9d | 458 | DHCP_OPTION_COUNT *OpCount;\r |
772db4bb | 459 | \r |
d1050b9d MK |
460 | OpCount = (DHCP_OPTION_COUNT *)Context;\r |
461 | OpCount[Tag].Offset = (UINT16)(OpCount[Tag].Offset + Len);\r | |
772db4bb | 462 | \r |
463 | return EFI_SUCCESS;\r | |
464 | }\r | |
465 | \r | |
772db4bb | 466 | /**\r |
f9204641 | 467 | Call back function to DhcpIterateOptions to consolidate each option's\r |
468 | data. There are maybe several occurrence of the same option.\r | |
772db4bb | 469 | \r |
3e8c18da | 470 | @param[in] Tag The option to consolidate its data\r |
471 | @param[in] Len The length of option data\r | |
c194ccca | 472 | @param[in] Data The data of the option's current occurrence\r |
3e8c18da | 473 | @param[in] Context The context, which is DHCP_OPTION_CONTEXT. This\r |
474 | array is just a wrap to pass THREE parameters.\r | |
772db4bb | 475 | \r |
476 | @retval EFI_SUCCESS It always returns EFI_SUCCESS\r | |
477 | \r | |
478 | **/\r | |
772db4bb | 479 | EFI_STATUS\r |
480 | DhcpFillOption (\r | |
d1050b9d MK |
481 | IN UINT8 Tag,\r |
482 | IN UINT8 Len,\r | |
483 | IN UINT8 *Data,\r | |
484 | IN VOID *Context\r | |
772db4bb | 485 | )\r |
486 | {\r | |
d1050b9d MK |
487 | DHCP_OPTION_CONTEXT *OptContext;\r |
488 | DHCP_OPTION_COUNT *OptCount;\r | |
489 | DHCP_OPTION *Options;\r | |
490 | UINT8 *Buf;\r | |
491 | UINT8 Index;\r | |
772db4bb | 492 | \r |
d1050b9d | 493 | OptContext = (DHCP_OPTION_CONTEXT *)Context;\r |
772db4bb | 494 | \r |
d1050b9d MK |
495 | OptCount = OptContext->OpCount;\r |
496 | Index = OptCount[Tag].Index;\r | |
497 | Options = OptContext->Options;\r | |
498 | Buf = OptContext->Buf;\r | |
772db4bb | 499 | \r |
500 | if (Options[Index].Data == NULL) {\r | |
501 | Options[Index].Tag = Tag;\r | |
502 | Options[Index].Data = Buf + OptCount[Tag].Offset;\r | |
503 | }\r | |
504 | \r | |
e48e37fc | 505 | CopyMem (Buf + OptCount[Tag].Offset, Data, Len);\r |
772db4bb | 506 | \r |
d1050b9d MK |
507 | OptCount[Tag].Offset = (UINT16)(OptCount[Tag].Offset + Len);\r |
508 | Options[Index].Len = (UINT16)(Options[Index].Len + Len);\r | |
772db4bb | 509 | return EFI_SUCCESS;\r |
510 | }\r | |
511 | \r | |
772db4bb | 512 | /**\r |
513 | Parse the options of a DHCP packet. It supports RFC 3396: Encoding\r | |
514 | Long Options in DHCP. That is, it will combine all the option value\r | |
c194ccca AC |
515 | of all the occurrences of each option.\r |
516 | A little bit of implementation:\r | |
772db4bb | 517 | It adopts the "Key indexed counting" algorithm. First, it allocates\r |
518 | an array of 256 DHCP_OPTION_COUNTs because DHCP option tag is encoded\r | |
519 | as a UINT8. It then iterates the DHCP packet to get data length of\r | |
520 | each option by calling DhcpIterOptions with DhcpGetOptionLen. Now, it\r | |
521 | knows the number of present options and their length. It allocates a\r | |
f9204641 | 522 | array of DHCP_OPTION and a continuous buffer after the array to put\r |
772db4bb | 523 | all the options' data. Each option's data is pointed to by the Data\r |
524 | field in DHCP_OPTION structure. At last, it call DhcpIterateOptions\r | |
525 | with DhcpFillOption to fill each option's data to its position in the\r | |
526 | buffer.\r | |
527 | \r | |
3e8c18da | 528 | @param[in] Packet The DHCP packet to parse the options\r |
529 | @param[out] Count The number of valid dhcp options present in the\r | |
530 | packet\r | |
531 | @param[out] OptionPoint The array that contains the DHCP options. Caller\r | |
532 | should free it.\r | |
772db4bb | 533 | \r |
7b0ae7e8 | 534 | @retval EFI_NOT_FOUND Cannot find any option.\r |
772db4bb | 535 | @retval EFI_OUT_OF_RESOURCES Failed to allocate memory to parse the packet.\r |
c194ccca | 536 | @retval EFI_INVALID_PARAMETER The options are mal-formatted\r |
772db4bb | 537 | @retval EFI_SUCCESS The options are parsed into OptionPoint\r |
538 | \r | |
539 | **/\r | |
540 | EFI_STATUS\r | |
541 | DhcpParseOption (\r | |
d1050b9d MK |
542 | IN EFI_DHCP4_PACKET *Packet,\r |
543 | OUT INTN *Count,\r | |
544 | OUT DHCP_OPTION **OptionPoint\r | |
772db4bb | 545 | )\r |
546 | {\r | |
d1050b9d MK |
547 | DHCP_OPTION_CONTEXT Context;\r |
548 | DHCP_OPTION *Options;\r | |
549 | DHCP_OPTION_COUNT *OptCount;\r | |
550 | EFI_STATUS Status;\r | |
551 | UINT16 TotalLen;\r | |
552 | INTN OptNum;\r | |
553 | INTN Index;\r | |
772db4bb | 554 | \r |
555 | ASSERT ((Count != NULL) && (OptionPoint != NULL));\r | |
556 | \r | |
557 | //\r | |
558 | // First compute how many options and how long each option is\r | |
559 | // with the "Key indexed counting" algorithms.\r | |
560 | //\r | |
e48e37fc | 561 | OptCount = AllocateZeroPool (DHCP_MAX_OPTIONS * sizeof (DHCP_OPTION_COUNT));\r |
772db4bb | 562 | \r |
563 | if (OptCount == NULL) {\r | |
564 | return EFI_OUT_OF_RESOURCES;\r | |
565 | }\r | |
566 | \r | |
567 | Status = DhcpIterateOptions (Packet, DhcpGetOptionLen, OptCount);\r | |
568 | \r | |
569 | if (EFI_ERROR (Status)) {\r | |
570 | goto ON_EXIT;\r | |
571 | }\r | |
572 | \r | |
573 | //\r | |
574 | // Before the loop, Offset is the length of the option. After loop,\r | |
575 | // OptCount[Index].Offset specifies the offset into the continuous\r | |
576 | // option value buffer to put the data.\r | |
577 | //\r | |
d1050b9d MK |
578 | TotalLen = 0;\r |
579 | OptNum = 0;\r | |
772db4bb | 580 | \r |
581 | for (Index = 0; Index < DHCP_MAX_OPTIONS; Index++) {\r | |
582 | if (OptCount[Index].Offset != 0) {\r | |
d1050b9d | 583 | OptCount[Index].Index = (UINT8)OptNum;\r |
772db4bb | 584 | \r |
d1050b9d MK |
585 | TotalLen = (UINT16)(TotalLen + OptCount[Index].Offset);\r |
586 | OptCount[Index].Offset = (UINT16)(TotalLen - OptCount[Index].Offset);\r | |
772db4bb | 587 | \r |
588 | OptNum++;\r | |
589 | }\r | |
590 | }\r | |
591 | \r | |
d1050b9d MK |
592 | *Count = OptNum;\r |
593 | *OptionPoint = NULL;\r | |
772db4bb | 594 | \r |
595 | if (OptNum == 0) {\r | |
596 | goto ON_EXIT;\r | |
597 | }\r | |
598 | \r | |
599 | //\r | |
600 | // Allocate a buffer to hold the DHCP options, and after that, a\r | |
601 | // continuous buffer to put all the options' data.\r | |
602 | //\r | |
d1050b9d | 603 | Options = AllocateZeroPool ((UINTN)(OptNum * sizeof (DHCP_OPTION)) + TotalLen);\r |
772db4bb | 604 | \r |
605 | if (Options == NULL) {\r | |
606 | Status = EFI_OUT_OF_RESOURCES;\r | |
607 | goto ON_EXIT;\r | |
608 | }\r | |
609 | \r | |
610 | Context.OpCount = OptCount;\r | |
611 | Context.Options = Options;\r | |
d1050b9d | 612 | Context.Buf = (UINT8 *)(Options + OptNum);\r |
772db4bb | 613 | \r |
d1050b9d | 614 | Status = DhcpIterateOptions (Packet, DhcpFillOption, &Context);\r |
772db4bb | 615 | \r |
616 | if (EFI_ERROR (Status)) {\r | |
a4df47f1 | 617 | FreePool (Options);\r |
772db4bb | 618 | goto ON_EXIT;\r |
619 | }\r | |
620 | \r | |
621 | *OptionPoint = Options;\r | |
622 | \r | |
623 | ON_EXIT:\r | |
a4df47f1 | 624 | FreePool (OptCount);\r |
772db4bb | 625 | return Status;\r |
626 | }\r | |
627 | \r | |
772db4bb | 628 | /**\r |
629 | Validate the packet's options. If necessary, allocate\r | |
630 | and fill in the interested parameters.\r | |
631 | \r | |
3e8c18da | 632 | @param[in] Packet The packet to validate the options\r |
633 | @param[out] Para The variable to save the DHCP parameters.\r | |
772db4bb | 634 | \r |
635 | @retval EFI_OUT_OF_RESOURCES Failed to allocate memory to validate the packet.\r | |
c194ccca | 636 | @retval EFI_INVALID_PARAMETER The options are mal-formatted\r |
772db4bb | 637 | @retval EFI_SUCCESS The options are parsed into OptionPoint\r |
638 | \r | |
639 | **/\r | |
640 | EFI_STATUS\r | |
641 | DhcpValidateOptions (\r | |
d1050b9d MK |
642 | IN EFI_DHCP4_PACKET *Packet,\r |
643 | OUT DHCP_PARAMETER **Para OPTIONAL\r | |
772db4bb | 644 | )\r |
645 | {\r | |
d1050b9d MK |
646 | DHCP_PARAMETER Parameter;\r |
647 | DHCP_OPTION_FORMAT *Format;\r | |
648 | DHCP_OPTION *AllOption;\r | |
649 | DHCP_OPTION *Option;\r | |
650 | EFI_STATUS Status;\r | |
651 | BOOLEAN Updated;\r | |
652 | INTN Count;\r | |
653 | INTN Index;\r | |
772db4bb | 654 | \r |
655 | if (Para != NULL) {\r | |
656 | *Para = NULL;\r | |
657 | }\r | |
658 | \r | |
659 | AllOption = NULL;\r | |
772db4bb | 660 | \r |
894d038a | 661 | Status = DhcpParseOption (Packet, &Count, &AllOption);\r |
772db4bb | 662 | if (EFI_ERROR (Status) || (Count == 0)) {\r |
663 | return Status;\r | |
664 | }\r | |
d1050b9d | 665 | \r |
a4df47f1 | 666 | ASSERT (AllOption != NULL);\r |
667 | \r | |
772db4bb | 668 | Updated = FALSE;\r |
e48e37fc | 669 | ZeroMem (&Parameter, sizeof (Parameter));\r |
772db4bb | 670 | \r |
671 | for (Index = 0; Index < Count; Index++) {\r | |
672 | Option = &AllOption[Index];\r | |
673 | \r | |
674 | //\r | |
675 | // Find the format of the option then validate it.\r | |
676 | //\r | |
677 | Format = DhcpFindOptionFormat (Option->Tag);\r | |
678 | \r | |
679 | if (Format == NULL) {\r | |
680 | continue;\r | |
681 | }\r | |
682 | \r | |
683 | if (!DhcpOptionIsValid (Format, Option->Data, Option->Len)) {\r | |
684 | Status = EFI_INVALID_PARAMETER;\r | |
685 | goto ON_EXIT;\r | |
686 | }\r | |
687 | \r | |
688 | //\r | |
689 | // Get the client interested parameters\r | |
690 | //\r | |
691 | if (Format->Alert && (Para != NULL)) {\r | |
692 | Updated = TRUE;\r | |
693 | Status = DhcpGetParameter (Option->Tag, Option->Len, Option->Data, &Parameter);\r | |
694 | \r | |
695 | if (EFI_ERROR (Status)) {\r | |
696 | goto ON_EXIT;\r | |
697 | }\r | |
698 | }\r | |
699 | }\r | |
700 | \r | |
701 | if (Updated && (Para != NULL)) {\r | |
a4df47f1 | 702 | *Para = AllocateCopyPool (sizeof (DHCP_PARAMETER), &Parameter);\r |
703 | if (*Para == NULL) {\r | |
772db4bb | 704 | Status = EFI_OUT_OF_RESOURCES;\r |
705 | goto ON_EXIT;\r | |
706 | }\r | |
772db4bb | 707 | }\r |
708 | \r | |
709 | ON_EXIT:\r | |
a4df47f1 | 710 | FreePool (AllOption);\r |
772db4bb | 711 | return Status;\r |
712 | }\r | |
713 | \r | |
772db4bb | 714 | /**\r |
715 | Append an option to the memory, if the option is longer than\r | |
716 | 255 bytes, splits it into several options.\r | |
717 | \r | |
3e8c18da | 718 | @param[out] Buf The buffer to append the option to\r |
719 | @param[in] Tag The option's tag\r | |
720 | @param[in] DataLen The length of the option's data\r | |
721 | @param[in] Data The option's data\r | |
772db4bb | 722 | \r |
723 | @return The position to append the next option\r | |
724 | \r | |
725 | **/\r | |
726 | UINT8 *\r | |
727 | DhcpAppendOption (\r | |
d1050b9d MK |
728 | OUT UINT8 *Buf,\r |
729 | IN UINT8 Tag,\r | |
730 | IN UINT16 DataLen,\r | |
731 | IN UINT8 *Data\r | |
772db4bb | 732 | )\r |
733 | {\r | |
d1050b9d MK |
734 | INTN Index;\r |
735 | INTN Len;\r | |
772db4bb | 736 | \r |
737 | ASSERT (DataLen != 0);\r | |
738 | \r | |
739 | for (Index = 0; Index < (DataLen + 254) / 255; Index++) {\r | |
d1050b9d | 740 | Len = MIN (255, DataLen - Index * 255);\r |
772db4bb | 741 | \r |
742 | *(Buf++) = Tag;\r | |
d1050b9d MK |
743 | *(Buf++) = (UINT8)Len;\r |
744 | CopyMem (Buf, Data + Index * 255, (UINTN)Len);\r | |
772db4bb | 745 | \r |
d1050b9d | 746 | Buf += Len;\r |
772db4bb | 747 | }\r |
748 | \r | |
749 | return Buf;\r | |
750 | }\r | |
751 | \r | |
772db4bb | 752 | /**\r |
753 | Build a new DHCP packet from a seed packet. Options may be deleted or\r | |
754 | appended. The caller should free the NewPacket when finished using it.\r | |
755 | \r | |
3e8c18da | 756 | @param[in] SeedPacket The seed packet to start with\r |
757 | @param[in] DeleteCount The number of options to delete\r | |
758 | @param[in] DeleteList The options to delete from the packet\r | |
759 | @param[in] AppendCount The number of options to append\r | |
760 | @param[in] AppendList The options to append to the packet\r | |
761 | @param[out] NewPacket The new packet, allocated and built by this\r | |
762 | function.\r | |
772db4bb | 763 | \r |
764 | @retval EFI_OUT_OF_RESOURCES Failed to allocate memory\r | |
c194ccca | 765 | @retval EFI_INVALID_PARAMETER The options in SeekPacket are mal-formatted\r |
772db4bb | 766 | @retval EFI_SUCCESS The packet is build.\r |
767 | \r | |
768 | **/\r | |
769 | EFI_STATUS\r | |
770 | DhcpBuild (\r | |
d1050b9d MK |
771 | IN EFI_DHCP4_PACKET *SeedPacket,\r |
772 | IN UINT32 DeleteCount,\r | |
773 | IN UINT8 *DeleteList OPTIONAL,\r | |
774 | IN UINT32 AppendCount,\r | |
775 | IN EFI_DHCP4_PACKET_OPTION *AppendList[] OPTIONAL,\r | |
776 | OUT EFI_DHCP4_PACKET **NewPacket\r | |
772db4bb | 777 | )\r |
778 | {\r | |
d1050b9d MK |
779 | DHCP_OPTION *Mark;\r |
780 | DHCP_OPTION *SeedOptions;\r | |
781 | EFI_DHCP4_PACKET *Packet;\r | |
782 | EFI_STATUS Status;\r | |
783 | INTN Count;\r | |
784 | UINT32 Index;\r | |
785 | UINT32 Len;\r | |
786 | UINT8 *Buf;\r | |
772db4bb | 787 | \r |
788 | //\r | |
c194ccca | 789 | // Use an array of DHCP_OPTION to mark the existence\r |
772db4bb | 790 | // and position of each valid options.\r |
791 | //\r | |
e48e37fc | 792 | Mark = AllocatePool (sizeof (DHCP_OPTION) * DHCP_MAX_OPTIONS);\r |
772db4bb | 793 | \r |
794 | if (Mark == NULL) {\r | |
795 | return EFI_OUT_OF_RESOURCES;\r | |
796 | }\r | |
797 | \r | |
798 | for (Index = 0; Index < DHCP_MAX_OPTIONS; Index++) {\r | |
d1050b9d | 799 | Mark[Index].Tag = (UINT8)Index;\r |
772db4bb | 800 | Mark[Index].Len = 0;\r |
801 | }\r | |
802 | \r | |
803 | //\r | |
804 | // Get list of the options from the seed packet, then put\r | |
805 | // them to the mark array according to their tags.\r | |
806 | //\r | |
807 | SeedOptions = NULL;\r | |
808 | Status = DhcpParseOption (SeedPacket, &Count, &SeedOptions);\r | |
809 | \r | |
810 | if (EFI_ERROR (Status)) {\r | |
811 | goto ON_ERROR;\r | |
812 | }\r | |
813 | \r | |
a4df47f1 | 814 | if (SeedOptions != NULL) {\r |
d1050b9d | 815 | for (Index = 0; Index < (UINT32)Count; Index++) {\r |
a4df47f1 | 816 | Mark[SeedOptions[Index].Tag] = SeedOptions[Index];\r |
817 | }\r | |
772db4bb | 818 | }\r |
819 | \r | |
820 | //\r | |
821 | // Mark the option's length is zero if it is in the DeleteList.\r | |
822 | //\r | |
823 | for (Index = 0; Index < DeleteCount; Index++) {\r | |
824 | Mark[DeleteList[Index]].Len = 0;\r | |
825 | }\r | |
826 | \r | |
827 | //\r | |
828 | // Add or replace the option if it is in the append list.\r | |
829 | //\r | |
830 | for (Index = 0; Index < AppendCount; Index++) {\r | |
831 | Mark[AppendList[Index]->OpCode].Len = AppendList[Index]->Length;\r | |
832 | Mark[AppendList[Index]->OpCode].Data = AppendList[Index]->Data;\r | |
833 | }\r | |
834 | \r | |
835 | //\r | |
836 | // compute the new packet length. No need to add 1 byte for\r | |
837 | // EOP option since EFI_DHCP4_PACKET includes one extra byte\r | |
838 | // for option. It is necessary to split the option if it is\r | |
839 | // longer than 255 bytes.\r | |
840 | //\r | |
841 | Len = sizeof (EFI_DHCP4_PACKET);\r | |
842 | \r | |
843 | for (Index = 0; Index < DHCP_MAX_OPTIONS; Index++) {\r | |
844 | if (Mark[Index].Len != 0) {\r | |
845 | Len += ((Mark[Index].Len + 254) / 255) * 2 + Mark[Index].Len;\r | |
846 | }\r | |
847 | }\r | |
848 | \r | |
d1050b9d MK |
849 | Status = EFI_OUT_OF_RESOURCES;\r |
850 | Packet = (EFI_DHCP4_PACKET *)AllocatePool (Len);\r | |
772db4bb | 851 | \r |
852 | if (Packet == NULL) {\r | |
853 | goto ON_ERROR;\r | |
854 | }\r | |
855 | \r | |
d1050b9d MK |
856 | Packet->Size = Len;\r |
857 | Packet->Length = 0;\r | |
687a2e5f | 858 | CopyMem (&Packet->Dhcp4.Header, &SeedPacket->Dhcp4.Header, sizeof (Packet->Dhcp4.Header));\r |
d1050b9d MK |
859 | Packet->Dhcp4.Magik = DHCP_OPTION_MAGIC;\r |
860 | Buf = Packet->Dhcp4.Option;\r | |
772db4bb | 861 | \r |
862 | for (Index = 0; Index < DHCP_MAX_OPTIONS; Index++) {\r | |
863 | if (Mark[Index].Len != 0) {\r | |
864 | Buf = DhcpAppendOption (Buf, Mark[Index].Tag, Mark[Index].Len, Mark[Index].Data);\r | |
865 | }\r | |
866 | }\r | |
867 | \r | |
d1050b9d MK |
868 | *(Buf++) = DHCP4_TAG_EOP;\r |
869 | Packet->Length = sizeof (EFI_DHCP4_HEADER) + sizeof (UINT32)\r | |
870 | + (UINT32)(Buf - Packet->Dhcp4.Option);\r | |
772db4bb | 871 | \r |
d1050b9d MK |
872 | *NewPacket = Packet;\r |
873 | Status = EFI_SUCCESS;\r | |
772db4bb | 874 | \r |
875 | ON_ERROR:\r | |
876 | if (SeedOptions != NULL) {\r | |
a4df47f1 | 877 | FreePool (SeedOptions);\r |
772db4bb | 878 | }\r |
879 | \r | |
a4df47f1 | 880 | FreePool (Mark);\r |
772db4bb | 881 | return Status;\r |
882 | }\r |