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772db4bb | 1 | /** @file\r |
2 | \r | |
3 | Copyright (c) 2004, Intel Corporation\r | |
4 | All rights reserved. This program and the accompanying materials\r | |
5 | are licensed and made available under the terms and conditions of the BSD License\r | |
6 | which accompanies this distribution. The full text of the license may be found at\r | |
7 | http://opensource.org/licenses/bsd-license.php\r | |
8 | \r | |
9 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
10 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
11 | \r | |
12 | Module Name:\r | |
13 | PxeDhcp4RenewRebind.c\r | |
14 | \r | |
15 | Abstract:\r | |
16 | \r | |
17 | \r | |
18 | **/\r | |
19 | \r | |
20 | \r | |
21 | #include "PxeDhcp4.h"\r | |
22 | \r | |
23 | /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */\r | |
24 | \r | |
25 | /**\r | |
26 | Parameters:\r | |
27 | \r | |
28 | @return -2 = ignore, stop waiting\r | |
29 | @return -1 = ignore, keep waiting\r | |
30 | @return 0 = accept, keep waiting\r | |
31 | @return 1 = accept, stop waiting\r | |
32 | \r | |
33 | **/\r | |
772db4bb | 34 | INTN\r |
fe1e36e5 | 35 | acknak_verify_renewrebind (\r |
772db4bb | 36 | IN PXE_DHCP4_PRIVATE_DATA *Private,\r |
37 | IN DHCP4_PACKET *tx_pkt,\r | |
38 | IN DHCP4_PACKET *rx_pkt,\r | |
39 | IN UINTN rx_pkt_size\r | |
40 | )\r | |
41 | {\r | |
42 | EFI_STATUS efi_status;\r | |
43 | DHCP4_OP *msg_type_op;\r | |
44 | DHCP4_OP *srvid_op;\r | |
45 | DHCP4_OP *renew_op;\r | |
46 | DHCP4_OP *rebind_op;\r | |
47 | DHCP4_OP *lease_time_op;\r | |
48 | UINT32 magik;\r | |
49 | \r | |
50 | //\r | |
51 | // Verify parameters. Unused parameters are also touched\r | |
52 | // to make the compiler happy.\r | |
53 | //\r | |
54 | ASSERT (Private);\r | |
55 | ASSERT (rx_pkt);\r | |
56 | \r | |
57 | if (Private == NULL || rx_pkt == NULL) {\r | |
58 | return -2;\r | |
59 | }\r | |
60 | \r | |
61 | tx_pkt = tx_pkt;\r | |
62 | rx_pkt_size = rx_pkt_size;\r | |
63 | \r | |
64 | //\r | |
65 | // This must be a DHCP Ack message.\r | |
66 | //\r | |
67 | magik = htonl (DHCP4_MAGIK_NUMBER);\r | |
68 | \r | |
69 | if (CompareMem (&rx_pkt->dhcp4.magik, &magik, 4)) {\r | |
70 | return -1;\r | |
71 | }\r | |
72 | \r | |
73 | efi_status = find_opt (rx_pkt, DHCP4_MESSAGE_TYPE, 0, &msg_type_op);\r | |
74 | \r | |
75 | if (EFI_ERROR (efi_status)) {\r | |
76 | return -1;\r | |
77 | }\r | |
78 | \r | |
79 | if (msg_type_op->len != 1) {\r | |
80 | return -1;\r | |
81 | }\r | |
82 | \r | |
83 | if (msg_type_op->data[0] != DHCP4_MESSAGE_TYPE_ACK) {\r | |
84 | return -1;\r | |
85 | }\r | |
86 | //\r | |
87 | // There must be a server identifier.\r | |
88 | //\r | |
89 | efi_status = find_opt (rx_pkt, DHCP4_SERVER_IDENTIFIER, 0, &srvid_op);\r | |
90 | \r | |
91 | if (EFI_ERROR (efi_status)) {\r | |
92 | return -1;\r | |
93 | }\r | |
94 | \r | |
95 | if (srvid_op->len != 4) {\r | |
96 | return -1;\r | |
97 | }\r | |
98 | //\r | |
99 | // There should be a renewal time.\r | |
100 | // If there is not, we will default to the 7/8 of the rebinding time.\r | |
101 | //\r | |
102 | efi_status = find_opt (rx_pkt, DHCP4_RENEWAL_TIME, 0, &renew_op);\r | |
103 | \r | |
104 | if (EFI_ERROR (efi_status)) {\r | |
105 | renew_op = NULL;\r | |
106 | } else if (renew_op->len != 4) {\r | |
107 | renew_op = NULL;\r | |
108 | }\r | |
109 | //\r | |
110 | // There should be a rebinding time.\r | |
111 | // If there is not, we will default to 7/8 of the lease time.\r | |
112 | //\r | |
113 | efi_status = find_opt (rx_pkt, DHCP4_REBINDING_TIME, 0, &rebind_op);\r | |
114 | \r | |
115 | if (EFI_ERROR (efi_status)) {\r | |
116 | rebind_op = NULL;\r | |
117 | } else if (rebind_op->len != 4) {\r | |
118 | rebind_op = NULL;\r | |
119 | }\r | |
120 | //\r | |
121 | // There should be a lease time.\r | |
122 | // If there is not, we will default to one week.\r | |
123 | //\r | |
124 | efi_status = find_opt (rx_pkt, DHCP4_LEASE_TIME, 0, &lease_time_op);\r | |
125 | \r | |
126 | if (EFI_ERROR (efi_status)) {\r | |
127 | lease_time_op = NULL;\r | |
128 | } else if (lease_time_op->len != 4) {\r | |
129 | lease_time_op = NULL;\r | |
130 | }\r | |
131 | //\r | |
132 | // Packet looks good. Double check the renew, rebind and lease times.\r | |
133 | //\r | |
134 | CopyMem (&Private->ServerIp, srvid_op->data, 4);\r | |
135 | \r | |
136 | if (renew_op != NULL) {\r | |
137 | CopyMem (&Private->RenewTime, renew_op->data, 4);\r | |
138 | Private->RenewTime = htonl (Private->RenewTime);\r | |
139 | } else {\r | |
140 | Private->RenewTime = 0;\r | |
141 | }\r | |
142 | \r | |
143 | if (rebind_op != NULL) {\r | |
144 | CopyMem (&Private->RebindTime, rebind_op->data, 4);\r | |
145 | Private->RebindTime = htonl (Private->RebindTime);\r | |
146 | } else {\r | |
147 | Private->RebindTime = 0;\r | |
148 | }\r | |
149 | \r | |
150 | if (lease_time_op != NULL) {\r | |
151 | CopyMem (&Private->LeaseTime, lease_time_op->data, 4);\r | |
152 | Private->LeaseTime = htonl (Private->LeaseTime);\r | |
153 | } else {\r | |
154 | Private->LeaseTime = 0;\r | |
155 | }\r | |
156 | \r | |
157 | if (Private->LeaseTime < 60) {\r | |
158 | Private->LeaseTime = 7 * 86400;\r | |
159 | }\r | |
160 | \r | |
161 | if (Private->RebindTime < 52 || Private->RebindTime >= Private->LeaseTime) {\r | |
162 | Private->RebindTime = Private->LeaseTime / 2 + Private->LeaseTime / 4 + Private->LeaseTime / 8;\r | |
163 | }\r | |
164 | \r | |
165 | if (Private->RenewTime < 45 || Private->RenewTime >= Private->RebindTime) {\r | |
166 | Private->RenewTime = Private->RebindTime / 2 + Private->RebindTime / 4 + Private->RebindTime / 8;\r | |
167 | }\r | |
168 | \r | |
169 | return 1;\r | |
170 | }\r | |
171 | \r | |
172 | /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */\r | |
772db4bb | 173 | EFI_STATUS\r |
174 | EFIAPI\r | |
175 | renew_rebind (\r | |
176 | IN EFI_PXE_DHCP4_PROTOCOL *This,\r | |
177 | IN UINTN seconds_timeout,\r | |
178 | IN BOOLEAN renew\r | |
179 | )\r | |
180 | {\r | |
181 | PXE_DHCP4_PRIVATE_DATA *Private;\r | |
182 | EFI_IP_ADDRESS ServerIp;\r | |
183 | EFI_IP_ADDRESS client_ip;\r | |
184 | EFI_IP_ADDRESS subnet_mask;\r | |
185 | EFI_IP_ADDRESS gateway_ip;\r | |
186 | DHCP4_PACKET Request;\r | |
187 | DHCP4_PACKET AckNak;\r | |
188 | DHCP4_OP *op;\r | |
189 | EFI_STATUS efi_status;\r | |
190 | \r | |
191 | //\r | |
192 | // Check for invalid parameters.\r | |
193 | //\r | |
194 | if (This == NULL || seconds_timeout < DHCP4_MIN_SECONDS || seconds_timeout > DHCP4_MAX_SECONDS) {\r | |
195 | return EFI_INVALID_PARAMETER;\r | |
196 | }\r | |
197 | //\r | |
198 | // Check for proper protocol state.\r | |
199 | //\r | |
200 | if (This->Data == NULL) {\r | |
201 | return EFI_NOT_STARTED;\r | |
202 | }\r | |
203 | \r | |
204 | if (!This->Data->SelectCompleted) {\r | |
205 | return EFI_NOT_READY;\r | |
206 | }\r | |
207 | \r | |
208 | if (This->Data->IsBootp) {\r | |
209 | return EFI_SUCCESS;\r | |
210 | }\r | |
211 | \r | |
212 | if (!This->Data->IsAck) {\r | |
213 | return EFI_INVALID_PARAMETER;\r | |
214 | }\r | |
215 | //\r | |
216 | // Get pointer to instance data.\r | |
217 | //\r | |
218 | Private = PXE_DHCP4_PRIVATE_DATA_FROM_THIS (This);\r | |
219 | \r | |
220 | if (Private == NULL) {\r | |
221 | return EFI_INVALID_PARAMETER;\r | |
222 | }\r | |
223 | \r | |
224 | if (Private->PxeBc == NULL) {\r | |
225 | return EFI_DEVICE_ERROR;\r | |
226 | }\r | |
227 | //\r | |
228 | // Copy Discover packet to temporary request packet\r | |
229 | // to be used for Renew/Rebind operation.\r | |
230 | //\r | |
231 | CopyMem (&Request, &This->Data->Discover, sizeof (DHCP4_PACKET));\r | |
232 | \r | |
233 | CopyMem (&Request.dhcp4.ciaddr, &This->Data->AckNak.dhcp4.yiaddr, 4);\r | |
234 | \r | |
235 | Request.dhcp4.flags = 0; /* Reply does not need to be broadcast. */\r | |
236 | \r | |
237 | //\r | |
238 | // Change message type from discover to request.\r | |
239 | //\r | |
240 | efi_status = find_opt (&Request, DHCP4_MESSAGE_TYPE, 0, &op);\r | |
241 | \r | |
242 | if (EFI_ERROR (efi_status)) {\r | |
243 | return EFI_INVALID_PARAMETER;\r | |
244 | }\r | |
245 | \r | |
246 | if (op->len != 1) {\r | |
247 | return EFI_INVALID_PARAMETER;\r | |
248 | }\r | |
249 | \r | |
250 | op->data[0] = DHCP4_MESSAGE_TYPE_REQUEST;\r | |
251 | \r | |
252 | //\r | |
253 | // Need a subnet mask.\r | |
254 | //\r | |
255 | efi_status = find_opt (\r | |
256 | &This->Data->AckNak,\r | |
257 | DHCP4_SUBNET_MASK,\r | |
258 | 0,\r | |
259 | &op\r | |
260 | );\r | |
261 | \r | |
262 | if (EFI_ERROR (efi_status)) {\r | |
263 | return EFI_INVALID_PARAMETER;\r | |
264 | }\r | |
265 | \r | |
266 | if (op->len != 4) {\r | |
267 | return EFI_INVALID_PARAMETER;\r | |
268 | }\r | |
269 | \r | |
270 | ZeroMem (&subnet_mask, sizeof (EFI_IP_ADDRESS));\r | |
271 | CopyMem (&subnet_mask, op->data, 4);\r | |
272 | \r | |
273 | //\r | |
274 | // Need a server IP address (renew) or a broadcast\r | |
275 | // IP address (rebind).\r | |
276 | //\r | |
277 | ZeroMem (&gateway_ip, sizeof (EFI_IP_ADDRESS));\r | |
278 | \r | |
279 | if (renew) {\r | |
280 | efi_status = find_opt (\r | |
281 | &This->Data->AckNak,\r | |
282 | DHCP4_SERVER_IDENTIFIER,\r | |
283 | 0,\r | |
284 | &op\r | |
285 | );\r | |
286 | \r | |
287 | if (EFI_ERROR (efi_status)) {\r | |
288 | return EFI_INVALID_PARAMETER;\r | |
289 | }\r | |
290 | \r | |
291 | if (op->len != 4) {\r | |
292 | return EFI_INVALID_PARAMETER;\r | |
293 | }\r | |
294 | \r | |
295 | ZeroMem (&ServerIp, sizeof (EFI_IP_ADDRESS));\r | |
296 | CopyMem (&ServerIp, op->data, 4);\r | |
297 | \r | |
298 | //\r | |
299 | //\r | |
300 | //\r | |
301 | if (CompareMem (&This->Data->AckNak.dhcp4.giaddr, &gateway_ip, 4)) {\r | |
302 | CopyMem (&gateway_ip, &This->Data->AckNak.dhcp4.giaddr, 4);\r | |
303 | }\r | |
304 | } else {\r | |
305 | SetMem (&ServerIp, sizeof (EFI_IP_ADDRESS), 0xFF);\r | |
306 | }\r | |
307 | //\r | |
308 | // Need a client IP address.\r | |
309 | //\r | |
310 | ZeroMem (&client_ip, sizeof (EFI_IP_ADDRESS));\r | |
311 | CopyMem (&client_ip, &Request.dhcp4.ciaddr, 4);\r | |
312 | \r | |
313 | //\r | |
314 | //\r | |
315 | //\r | |
316 | efi_status = gBS->HandleProtocol (\r | |
317 | Private->Handle,\r | |
318 | &gEfiPxeDhcp4CallbackProtocolGuid,\r | |
319 | (VOID *) &Private->callback\r | |
320 | );\r | |
321 | \r | |
322 | if (EFI_ERROR (efi_status)) {\r | |
323 | Private->callback = NULL;\r | |
324 | }\r | |
325 | \r | |
326 | Private->function = renew ? EFI_PXE_DHCP4_FUNCTION_RENEW : EFI_PXE_DHCP4_FUNCTION_REBIND;\r | |
327 | \r | |
328 | //\r | |
329 | // Transimit DHCP request and wait for DHCP ack...\r | |
330 | //\r | |
331 | efi_status = tx_rx_udp (\r | |
332 | Private,\r | |
333 | &ServerIp,\r | |
334 | &gateway_ip,\r | |
335 | &client_ip,\r | |
336 | &subnet_mask,\r | |
337 | &Request,\r | |
338 | &AckNak,\r | |
fe1e36e5 | 339 | &acknak_verify_renewrebind,\r |
772db4bb | 340 | seconds_timeout\r |
341 | );\r | |
342 | \r | |
343 | if (EFI_ERROR (efi_status)) {\r | |
344 | Private->callback = NULL;\r | |
345 | return efi_status;\r | |
346 | }\r | |
347 | //\r | |
348 | // Copy server identifier, renewal time and rebinding time\r | |
349 | // from temporary ack/nak packet into cached ack/nak packet.\r | |
350 | //\r | |
351 | efi_status = find_opt (\r | |
352 | &This->Data->AckNak,\r | |
353 | DHCP4_SERVER_IDENTIFIER,\r | |
354 | 0,\r | |
355 | &op\r | |
356 | );\r | |
357 | \r | |
358 | if (!EFI_ERROR (efi_status)) {\r | |
359 | if (op->len == 4) {\r | |
360 | CopyMem (op->data, &Private->ServerIp, 4);\r | |
361 | }\r | |
362 | }\r | |
363 | \r | |
364 | efi_status = find_opt (&This->Data->AckNak, DHCP4_RENEWAL_TIME, 0, &op);\r | |
365 | \r | |
366 | if (!EFI_ERROR (efi_status)) {\r | |
367 | if (op->len == 4) {\r | |
368 | CopyMem (op->data, &Private->RenewTime, 4);\r | |
369 | }\r | |
370 | }\r | |
371 | \r | |
372 | efi_status = find_opt (&This->Data->AckNak, DHCP4_REBINDING_TIME, 0, &op);\r | |
373 | \r | |
374 | if (!EFI_ERROR (efi_status)) {\r | |
375 | if (op->len == 4) {\r | |
376 | CopyMem (op->data, &Private->RebindTime, 4);\r | |
377 | }\r | |
378 | }\r | |
379 | \r | |
380 | Private->callback = NULL;\r | |
381 | return efi_status;\r | |
382 | }\r | |
383 | \r | |
384 | /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */\r | |
385 | EFI_STATUS\r | |
386 | EFIAPI\r | |
387 | PxeDhcp4Renew (\r | |
388 | IN EFI_PXE_DHCP4_PROTOCOL *This,\r | |
389 | IN UINTN seconds_timeout\r | |
390 | )\r | |
391 | {\r | |
392 | return renew_rebind (This, seconds_timeout, TRUE);\r | |
393 | }\r | |
394 | \r | |
395 | /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */\r | |
396 | EFI_STATUS\r | |
397 | EFIAPI\r | |
398 | PxeDhcp4Rebind (\r | |
399 | IN EFI_PXE_DHCP4_PROTOCOL *This,\r | |
400 | IN UINTN seconds_timeout\r | |
401 | )\r | |
402 | {\r | |
403 | return renew_rebind (This, seconds_timeout, FALSE);\r | |
404 | }\r | |
405 | \r | |
406 | /* eof - PxeDhcp4RenewRebind.c */\r |