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1 | /** @file\r | |
2 | EFI DHCP protocol implementation.\r | |
3 | \r | |
4 | Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>\r | |
5 | This program and the accompanying materials\r | |
6 | are licensed and made available under the terms and conditions of the BSD License\r | |
7 | which accompanies this distribution. The full text of the license may be found at\r | |
8 | http://opensource.org/licenses/bsd-license.php\r | |
9 | \r | |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | \r | |
13 | **/\r | |
14 | \r | |
15 | \r | |
16 | #include "Dhcp4Impl.h"\r | |
17 | \r | |
18 | UINT32 mDhcp4DefaultTimeout[4] = { 4, 8, 16, 32 };\r | |
19 | \r | |
20 | \r | |
21 | /**\r | |
22 | Send an initial DISCOVER or REQUEST message according to the\r | |
23 | DHCP service's current state.\r | |
24 | \r | |
25 | @param[in] DhcpSb The DHCP service instance\r | |
26 | \r | |
27 | @retval EFI_SUCCESS The request has been sent\r | |
28 | @retval other Some error occurs when sending the request.\r | |
29 | \r | |
30 | **/\r | |
31 | EFI_STATUS\r | |
32 | DhcpInitRequest (\r | |
33 | IN DHCP_SERVICE *DhcpSb\r | |
34 | )\r | |
35 | {\r | |
36 | EFI_STATUS Status;\r | |
37 | \r | |
38 | ASSERT ((DhcpSb->DhcpState == Dhcp4Init) || (DhcpSb->DhcpState == Dhcp4InitReboot));\r | |
39 | \r | |
40 | //\r | |
41 | // Clear initial time to make sure that elapsed-time is set to 0 for first Discover or REQUEST message.\r | |
42 | //\r | |
43 | DhcpSb->ActiveChild->ElaspedTime= 0;\r | |
44 | \r | |
45 | if (DhcpSb->DhcpState == Dhcp4Init) {\r | |
46 | DhcpSetState (DhcpSb, Dhcp4Selecting, FALSE);\r | |
47 | Status = DhcpSendMessage (DhcpSb, NULL, NULL, DHCP_MSG_DISCOVER, NULL);\r | |
48 | \r | |
49 | if (EFI_ERROR (Status)) {\r | |
50 | DhcpSb->DhcpState = Dhcp4Init;\r | |
51 | return Status;\r | |
52 | }\r | |
53 | } else {\r | |
54 | DhcpSetState (DhcpSb, Dhcp4Rebooting, FALSE);\r | |
55 | Status = DhcpSendMessage (DhcpSb, NULL, NULL, DHCP_MSG_REQUEST, NULL);\r | |
56 | \r | |
57 | if (EFI_ERROR (Status)) {\r | |
58 | DhcpSb->DhcpState = Dhcp4InitReboot;\r | |
59 | return Status;\r | |
60 | }\r | |
61 | }\r | |
62 | \r | |
63 | return EFI_SUCCESS;\r | |
64 | }\r | |
65 | \r | |
66 | \r | |
67 | /**\r | |
68 | Call user provided callback function, and return the value the\r | |
69 | function returns. If the user doesn't provide a callback, a\r | |
70 | proper return value is selected to let the caller continue the\r | |
71 | normal process.\r | |
72 | \r | |
73 | @param[in] DhcpSb The DHCP service instance\r | |
74 | @param[in] Event The event as defined in the spec\r | |
75 | @param[in] Packet The current packet trigger the event\r | |
76 | @param[out] NewPacket The user's return new packet\r | |
77 | \r | |
78 | @retval EFI_NOT_READY Direct the caller to continue collecting the offer.\r | |
79 | @retval EFI_SUCCESS The user function returns success.\r | |
80 | @retval EFI_ABORTED The user function ask it to abort.\r | |
81 | \r | |
82 | **/\r | |
83 | EFI_STATUS\r | |
84 | DhcpCallUser (\r | |
85 | IN DHCP_SERVICE *DhcpSb,\r | |
86 | IN EFI_DHCP4_EVENT Event,\r | |
87 | IN EFI_DHCP4_PACKET *Packet, OPTIONAL\r | |
88 | OUT EFI_DHCP4_PACKET **NewPacket OPTIONAL\r | |
89 | )\r | |
90 | {\r | |
91 | EFI_DHCP4_CONFIG_DATA *Config;\r | |
92 | EFI_STATUS Status;\r | |
93 | \r | |
94 | if (NewPacket != NULL) {\r | |
95 | *NewPacket = NULL;\r | |
96 | }\r | |
97 | \r | |
98 | //\r | |
99 | // If user doesn't provide the call back function, return the value\r | |
100 | // that directs the client to continue the normal process.\r | |
101 | // In Dhcp4Selecting EFI_SUCCESS tells the client to stop collecting\r | |
102 | // the offers and select a offer, EFI_NOT_READY tells the client to\r | |
103 | // collect more offers.\r | |
104 | //\r | |
105 | Config = &DhcpSb->ActiveConfig;\r | |
106 | \r | |
107 | if (Config->Dhcp4Callback == NULL) {\r | |
108 | if (Event == Dhcp4RcvdOffer) {\r | |
109 | return EFI_NOT_READY;\r | |
110 | }\r | |
111 | \r | |
112 | return EFI_SUCCESS;\r | |
113 | }\r | |
114 | \r | |
115 | Status = Config->Dhcp4Callback (\r | |
116 | &DhcpSb->ActiveChild->Dhcp4Protocol,\r | |
117 | Config->CallbackContext,\r | |
118 | (EFI_DHCP4_STATE) DhcpSb->DhcpState,\r | |
119 | Event,\r | |
120 | Packet,\r | |
121 | NewPacket\r | |
122 | );\r | |
123 | \r | |
124 | //\r | |
125 | // User's callback should only return EFI_SUCCESS, EFI_NOT_READY,\r | |
126 | // and EFI_ABORTED. If it returns values other than those, assume\r | |
127 | // it to be EFI_ABORTED.\r | |
128 | //\r | |
129 | if ((Status == EFI_SUCCESS) || (Status == EFI_NOT_READY)) {\r | |
130 | return Status;\r | |
131 | }\r | |
132 | \r | |
133 | return EFI_ABORTED;\r | |
134 | }\r | |
135 | \r | |
136 | \r | |
137 | /**\r | |
138 | Notify the user about the operation result.\r | |
139 | \r | |
140 | @param DhcpSb DHCP service instance\r | |
141 | @param Which Which notify function to signal\r | |
142 | \r | |
143 | **/\r | |
144 | VOID\r | |
145 | DhcpNotifyUser (\r | |
146 | IN DHCP_SERVICE *DhcpSb,\r | |
147 | IN INTN Which\r | |
148 | )\r | |
149 | {\r | |
150 | DHCP_PROTOCOL *Child;\r | |
151 | \r | |
152 | if ((Child = DhcpSb->ActiveChild) == NULL) {\r | |
153 | return ;\r | |
154 | }\r | |
155 | \r | |
156 | if ((Child->CompletionEvent != NULL) &&\r | |
157 | ((Which == DHCP_NOTIFY_COMPLETION) || (Which == DHCP_NOTIFY_ALL))\r | |
158 | ) {\r | |
159 | \r | |
160 | gBS->SignalEvent (Child->CompletionEvent);\r | |
161 | Child->CompletionEvent = NULL;\r | |
162 | }\r | |
163 | \r | |
164 | if ((Child->RenewRebindEvent != NULL) &&\r | |
165 | ((Which == DHCP_NOTIFY_RENEWREBIND) || (Which == DHCP_NOTIFY_ALL))\r | |
166 | ) {\r | |
167 | \r | |
168 | gBS->SignalEvent (Child->RenewRebindEvent);\r | |
169 | Child->RenewRebindEvent = NULL;\r | |
170 | }\r | |
171 | }\r | |
172 | \r | |
173 | \r | |
174 | \r | |
175 | /**\r | |
176 | Set the DHCP state. If CallUser is true, it will try to notify\r | |
177 | the user before change the state by DhcpNotifyUser. It returns\r | |
178 | EFI_ABORTED if the user return EFI_ABORTED, otherwise, it returns\r | |
179 | EFI_SUCCESS. If CallUser is FALSE, it isn't necessary to test\r | |
180 | the return value of this function.\r | |
181 | \r | |
182 | @param DhcpSb The DHCP service instance\r | |
183 | @param State The new DHCP state to change to\r | |
184 | @param CallUser Whether we need to call user\r | |
185 | \r | |
186 | @retval EFI_SUCCESS The state is changed\r | |
187 | @retval EFI_ABORTED The user asks to abort the DHCP process.\r | |
188 | \r | |
189 | **/\r | |
190 | EFI_STATUS\r | |
191 | DhcpSetState (\r | |
192 | IN OUT DHCP_SERVICE *DhcpSb,\r | |
193 | IN INTN State,\r | |
194 | IN BOOLEAN CallUser\r | |
195 | )\r | |
196 | {\r | |
197 | EFI_STATUS Status;\r | |
198 | \r | |
199 | if (CallUser) {\r | |
200 | Status = EFI_SUCCESS;\r | |
201 | \r | |
202 | if (State == Dhcp4Renewing) {\r | |
203 | Status = DhcpCallUser (DhcpSb, Dhcp4EnterRenewing, NULL, NULL);\r | |
204 | \r | |
205 | } else if (State == Dhcp4Rebinding) {\r | |
206 | Status = DhcpCallUser (DhcpSb, Dhcp4EnterRebinding, NULL, NULL);\r | |
207 | \r | |
208 | } else if (State == Dhcp4Bound) {\r | |
209 | Status = DhcpCallUser (DhcpSb, Dhcp4BoundCompleted, NULL, NULL);\r | |
210 | \r | |
211 | }\r | |
212 | \r | |
213 | if (EFI_ERROR (Status)) {\r | |
214 | return Status;\r | |
215 | }\r | |
216 | }\r | |
217 | \r | |
218 | //\r | |
219 | // Update the retransmission timer during the state transition.\r | |
220 | // This will clear the retry count. This is also why the rule\r | |
221 | // first transit the state, then send packets.\r | |
222 | //\r | |
223 | if (State == Dhcp4Selecting) {\r | |
224 | DhcpSb->MaxRetries = DhcpSb->ActiveConfig.DiscoverTryCount;\r | |
225 | } else {\r | |
226 | DhcpSb->MaxRetries = DhcpSb->ActiveConfig.RequestTryCount;\r | |
227 | }\r | |
228 | \r | |
229 | if (DhcpSb->MaxRetries == 0) {\r | |
230 | DhcpSb->MaxRetries = 4;\r | |
231 | }\r | |
232 | \r | |
233 | DhcpSb->CurRetry = 0;\r | |
234 | DhcpSb->PacketToLive = 0;\r | |
235 | DhcpSb->LastTimeout = 0;\r | |
236 | DhcpSb->DhcpState = State;\r | |
237 | return EFI_SUCCESS;\r | |
238 | }\r | |
239 | \r | |
240 | \r | |
241 | /**\r | |
242 | Set the retransmit timer for the packet. It will select from either\r | |
243 | the discover timeouts/request timeouts or the default timeout values.\r | |
244 | \r | |
245 | @param DhcpSb The DHCP service instance.\r | |
246 | \r | |
247 | **/\r | |
248 | VOID\r | |
249 | DhcpSetTransmitTimer (\r | |
250 | IN OUT DHCP_SERVICE *DhcpSb\r | |
251 | )\r | |
252 | {\r | |
253 | UINT32 *Times;\r | |
254 | \r | |
255 | ASSERT (DhcpSb->MaxRetries > DhcpSb->CurRetry);\r | |
256 | \r | |
257 | if (DhcpSb->DhcpState == Dhcp4Selecting) {\r | |
258 | Times = DhcpSb->ActiveConfig.DiscoverTimeout;\r | |
259 | } else {\r | |
260 | Times = DhcpSb->ActiveConfig.RequestTimeout;\r | |
261 | }\r | |
262 | \r | |
263 | if (Times == NULL) {\r | |
264 | Times = mDhcp4DefaultTimeout;\r | |
265 | }\r | |
266 | \r | |
267 | DhcpSb->PacketToLive = Times[DhcpSb->CurRetry];\r | |
268 | DhcpSb->LastTimeout = DhcpSb->PacketToLive;\r | |
269 | \r | |
270 | return;\r | |
271 | }\r | |
272 | \r | |
273 | /**\r | |
274 | Compute the lease. If the server grants a permanent lease, just\r | |
275 | process it as a normal timeout value since the lease will last\r | |
276 | more than 100 years.\r | |
277 | \r | |
278 | @param DhcpSb The DHCP service instance\r | |
279 | @param Para The DHCP parameter extracted from the server's\r | |
280 | response.\r | |
281 | **/\r | |
282 | VOID\r | |
283 | DhcpComputeLease (\r | |
284 | IN OUT DHCP_SERVICE *DhcpSb,\r | |
285 | IN DHCP_PARAMETER *Para\r | |
286 | )\r | |
287 | {\r | |
288 | ASSERT (Para != NULL);\r | |
289 | \r | |
290 | DhcpSb->Lease = Para->Lease;\r | |
291 | DhcpSb->T2 = Para->T2;\r | |
292 | DhcpSb->T1 = Para->T1;\r | |
293 | \r | |
294 | if (DhcpSb->Lease == 0) {\r | |
295 | DhcpSb->Lease = DHCP_DEFAULT_LEASE;\r | |
296 | }\r | |
297 | \r | |
298 | if ((DhcpSb->T2 == 0) || (DhcpSb->T2 >= Para->Lease)) {\r | |
299 | DhcpSb->T2 = Para->Lease - (Para->Lease >> 3);\r | |
300 | }\r | |
301 | \r | |
302 | if ((DhcpSb->T1 == 0) || (DhcpSb->T1 >= Para->T2)) {\r | |
303 | DhcpSb->T1 = DhcpSb->Lease >> 1;\r | |
304 | }\r | |
305 | }\r | |
306 | \r | |
307 | \r | |
308 | /**\r | |
309 | Configure a UDP IO port to use the acquired lease address.\r | |
310 | DHCP driver needs this port to unicast packet to the server\r | |
311 | such as DHCP release.\r | |
312 | \r | |
313 | @param[in] UdpIo The UDP IO to configure\r | |
314 | @param[in] Context Dhcp service instance.\r | |
315 | \r | |
316 | @retval EFI_SUCCESS The UDP IO port is successfully configured.\r | |
317 | @retval Others It failed to configure the port.\r | |
318 | \r | |
319 | **/\r | |
320 | EFI_STATUS\r | |
321 | EFIAPI\r | |
322 | DhcpConfigLeaseIoPort (\r | |
323 | IN UDP_IO *UdpIo,\r | |
324 | IN VOID *Context\r | |
325 | )\r | |
326 | {\r | |
327 | EFI_UDP4_CONFIG_DATA UdpConfigData;\r | |
328 | EFI_IPv4_ADDRESS Subnet;\r | |
329 | EFI_IPv4_ADDRESS Gateway;\r | |
330 | DHCP_SERVICE *DhcpSb;\r | |
331 | EFI_STATUS Status;\r | |
332 | IP4_ADDR Ip;\r | |
333 | \r | |
334 | DhcpSb = (DHCP_SERVICE *) Context;\r | |
335 | \r | |
336 | UdpConfigData.AcceptBroadcast = FALSE;\r | |
337 | UdpConfigData.AcceptPromiscuous = FALSE;\r | |
338 | UdpConfigData.AcceptAnyPort = FALSE;\r | |
339 | UdpConfigData.AllowDuplicatePort = TRUE;\r | |
340 | UdpConfigData.TypeOfService = 0;\r | |
341 | UdpConfigData.TimeToLive = 64;\r | |
342 | UdpConfigData.DoNotFragment = FALSE;\r | |
343 | UdpConfigData.ReceiveTimeout = 1;\r | |
344 | UdpConfigData.TransmitTimeout = 0;\r | |
345 | \r | |
346 | UdpConfigData.UseDefaultAddress = FALSE;\r | |
347 | UdpConfigData.StationPort = DHCP_CLIENT_PORT;\r | |
348 | UdpConfigData.RemotePort = DHCP_SERVER_PORT;\r | |
349 | \r | |
350 | Ip = HTONL (DhcpSb->ClientAddr);\r | |
351 | CopyMem (&UdpConfigData.StationAddress, &Ip, sizeof (EFI_IPv4_ADDRESS));\r | |
352 | \r | |
353 | Ip = HTONL (DhcpSb->Netmask);\r | |
354 | CopyMem (&UdpConfigData.SubnetMask, &Ip, sizeof (EFI_IPv4_ADDRESS));\r | |
355 | \r | |
356 | ZeroMem (&UdpConfigData.RemoteAddress, sizeof (EFI_IPv4_ADDRESS));\r | |
357 | \r | |
358 | Status = UdpIo->Protocol.Udp4->Configure (UdpIo->Protocol.Udp4, &UdpConfigData);\r | |
359 | \r | |
360 | if (EFI_ERROR (Status)) {\r | |
361 | return Status;\r | |
362 | }\r | |
363 | \r | |
364 | //\r | |
365 | // Add a default route if received from the server.\r | |
366 | //\r | |
367 | if ((DhcpSb->Para != NULL) && (DhcpSb->Para->Router != 0)) {\r | |
368 | ZeroMem (&Subnet, sizeof (EFI_IPv4_ADDRESS));\r | |
369 | \r | |
370 | Ip = HTONL (DhcpSb->Para->Router);\r | |
371 | CopyMem (&Gateway, &Ip, sizeof (EFI_IPv4_ADDRESS));\r | |
372 | \r | |
373 | UdpIo->Protocol.Udp4->Routes (UdpIo->Protocol.Udp4, FALSE, &Subnet, &Subnet, &Gateway);\r | |
374 | }\r | |
375 | \r | |
376 | return EFI_SUCCESS;\r | |
377 | }\r | |
378 | \r | |
379 | \r | |
380 | /**\r | |
381 | Update the lease states when a new lease is acquired. It will not only\r | |
382 | save the acquired the address and lease time, it will also create a UDP\r | |
383 | child to provide address resolution for the address.\r | |
384 | \r | |
385 | @param DhcpSb The DHCP service instance\r | |
386 | \r | |
387 | @retval EFI_OUT_OF_RESOURCES Failed to allocate resources.\r | |
388 | @retval EFI_SUCCESS The lease is recorded.\r | |
389 | \r | |
390 | **/\r | |
391 | EFI_STATUS\r | |
392 | DhcpLeaseAcquired (\r | |
393 | IN OUT DHCP_SERVICE *DhcpSb\r | |
394 | )\r | |
395 | {\r | |
396 | INTN Class;\r | |
397 | \r | |
398 | DhcpSb->ClientAddr = EFI_NTOHL (DhcpSb->Selected->Dhcp4.Header.YourAddr);\r | |
399 | \r | |
400 | if (DhcpSb->Para != NULL) {\r | |
401 | DhcpSb->Netmask = DhcpSb->Para->NetMask;\r | |
402 | DhcpSb->ServerAddr = DhcpSb->Para->ServerId;\r | |
403 | }\r | |
404 | \r | |
405 | if (DhcpSb->Netmask == 0) {\r | |
406 | Class = NetGetIpClass (DhcpSb->ClientAddr);\r | |
407 | ASSERT (Class < IP4_ADDR_CLASSE);\r | |
408 | DhcpSb->Netmask = gIp4AllMasks[Class << 3];\r | |
409 | }\r | |
410 | \r | |
411 | if (DhcpSb->LeaseIoPort != NULL) {\r | |
412 | UdpIoFreeIo (DhcpSb->LeaseIoPort);\r | |
413 | }\r | |
414 | \r | |
415 | //\r | |
416 | // Create a UDP/IP child to provide ARP service for the Leased IP,\r | |
417 | // and transmit unicast packet with it as source address. Don't\r | |
418 | // start receive on this port, the queued packet will be timeout.\r | |
419 | //\r | |
420 | DhcpSb->LeaseIoPort = UdpIoCreateIo (\r | |
421 | DhcpSb->Controller,\r | |
422 | DhcpSb->Image,\r | |
423 | DhcpConfigLeaseIoPort,\r | |
424 | UDP_IO_UDP4_VERSION,\r | |
425 | DhcpSb\r | |
426 | );\r | |
427 | \r | |
428 | if (DhcpSb->LeaseIoPort == NULL) {\r | |
429 | return EFI_OUT_OF_RESOURCES;\r | |
430 | }\r | |
431 | \r | |
432 | if (!DHCP_IS_BOOTP (DhcpSb->Para)) {\r | |
433 | DhcpComputeLease (DhcpSb, DhcpSb->Para);\r | |
434 | }\r | |
435 | \r | |
436 | return DhcpSetState (DhcpSb, Dhcp4Bound, TRUE);\r | |
437 | }\r | |
438 | \r | |
439 | \r | |
440 | /**\r | |
441 | Clean up the DHCP related states, IoStatus isn't reset.\r | |
442 | \r | |
443 | @param DhcpSb The DHCP instance service.\r | |
444 | \r | |
445 | **/\r | |
446 | VOID\r | |
447 | DhcpCleanLease (\r | |
448 | IN DHCP_SERVICE *DhcpSb\r | |
449 | )\r | |
450 | {\r | |
451 | DhcpSb->DhcpState = Dhcp4Init;\r | |
452 | DhcpSb->Xid = DhcpSb->Xid + 1;\r | |
453 | DhcpSb->ClientAddr = 0;\r | |
454 | DhcpSb->Netmask = 0;\r | |
455 | DhcpSb->ServerAddr = 0;\r | |
456 | \r | |
457 | if (DhcpSb->LastOffer != NULL) {\r | |
458 | FreePool (DhcpSb->LastOffer);\r | |
459 | DhcpSb->LastOffer = NULL;\r | |
460 | }\r | |
461 | \r | |
462 | if (DhcpSb->Selected != NULL) {\r | |
463 | FreePool (DhcpSb->Selected);\r | |
464 | DhcpSb->Selected = NULL;\r | |
465 | }\r | |
466 | \r | |
467 | if (DhcpSb->Para != NULL) {\r | |
468 | FreePool (DhcpSb->Para);\r | |
469 | DhcpSb->Para = NULL;\r | |
470 | }\r | |
471 | \r | |
472 | DhcpSb->Lease = 0;\r | |
473 | DhcpSb->T1 = 0;\r | |
474 | DhcpSb->T2 = 0;\r | |
475 | DhcpSb->ExtraRefresh = FALSE;\r | |
476 | \r | |
477 | if (DhcpSb->LeaseIoPort != NULL) {\r | |
478 | UdpIoFreeIo (DhcpSb->LeaseIoPort);\r | |
479 | DhcpSb->LeaseIoPort = NULL;\r | |
480 | }\r | |
481 | \r | |
482 | if (DhcpSb->LastPacket != NULL) {\r | |
483 | FreePool (DhcpSb->LastPacket);\r | |
484 | DhcpSb->LastPacket = NULL;\r | |
485 | }\r | |
486 | \r | |
487 | DhcpSb->PacketToLive = 0;\r | |
488 | DhcpSb->LastTimeout = 0;\r | |
489 | DhcpSb->CurRetry = 0;\r | |
490 | DhcpSb->MaxRetries = 0;\r | |
491 | DhcpSb->LeaseLife = 0;\r | |
492 | \r | |
493 | //\r | |
494 | // Clean active config data.\r | |
495 | //\r | |
496 | DhcpCleanConfigure (&DhcpSb->ActiveConfig);\r | |
497 | }\r | |
498 | \r | |
499 | \r | |
500 | /**\r | |
501 | Select a offer among all the offers collected. If the offer selected is\r | |
502 | of BOOTP, the lease is recorded and user notified. If the offer is of\r | |
503 | DHCP, it will request the offer from the server.\r | |
504 | \r | |
505 | @param[in] DhcpSb The DHCP service instance.\r | |
506 | \r | |
507 | @retval EFI_SUCCESS One of the offer is selected.\r | |
508 | \r | |
509 | **/\r | |
510 | EFI_STATUS\r | |
511 | DhcpChooseOffer (\r | |
512 | IN DHCP_SERVICE *DhcpSb\r | |
513 | )\r | |
514 | {\r | |
515 | EFI_DHCP4_PACKET *Selected;\r | |
516 | EFI_DHCP4_PACKET *NewPacket;\r | |
517 | EFI_DHCP4_PACKET *TempPacket;\r | |
518 | EFI_STATUS Status;\r | |
519 | \r | |
520 | ASSERT (DhcpSb->LastOffer != NULL);\r | |
521 | \r | |
522 | //\r | |
523 | // User will cache previous offers if he wants to select\r | |
524 | // from multiple offers. If user provides an invalid packet,\r | |
525 | // use the last offer, otherwise use the provided packet.\r | |
526 | //\r | |
527 | NewPacket = NULL;\r | |
528 | Status = DhcpCallUser (DhcpSb, Dhcp4SelectOffer, DhcpSb->LastOffer, &NewPacket);\r | |
529 | \r | |
530 | if (EFI_ERROR (Status)) {\r | |
531 | return Status;\r | |
532 | }\r | |
533 | \r | |
534 | Selected = DhcpSb->LastOffer;\r | |
535 | \r | |
536 | if ((NewPacket != NULL) && !EFI_ERROR (DhcpValidateOptions (NewPacket, NULL))) {\r | |
537 | TempPacket = (EFI_DHCP4_PACKET *) AllocatePool (NewPacket->Size);\r | |
538 | if (TempPacket != NULL) {\r | |
539 | CopyMem (TempPacket, NewPacket, NewPacket->Size);\r | |
540 | FreePool (Selected);\r | |
541 | Selected = TempPacket;\r | |
542 | }\r | |
543 | }\r | |
544 | \r | |
545 | DhcpSb->Selected = Selected;\r | |
546 | DhcpSb->LastOffer = NULL;\r | |
547 | DhcpSb->Para = NULL;\r | |
548 | DhcpValidateOptions (Selected, &DhcpSb->Para);\r | |
549 | \r | |
550 | //\r | |
551 | // A bootp offer has been selected, save the lease status,\r | |
552 | // enter bound state then notify the user.\r | |
553 | //\r | |
554 | if (DHCP_IS_BOOTP (DhcpSb->Para)) {\r | |
555 | Status = DhcpLeaseAcquired (DhcpSb);\r | |
556 | \r | |
557 | if (EFI_ERROR (Status)) {\r | |
558 | return Status;\r | |
559 | }\r | |
560 | \r | |
561 | DhcpSb->IoStatus = EFI_SUCCESS;\r | |
562 | DhcpNotifyUser (DhcpSb, DHCP_NOTIFY_ALL);\r | |
563 | return EFI_SUCCESS;\r | |
564 | }\r | |
565 | \r | |
566 | //\r | |
567 | // Send a DHCP requests\r | |
568 | //\r | |
569 | Status = DhcpSetState (DhcpSb, Dhcp4Requesting, TRUE);\r | |
570 | \r | |
571 | if (EFI_ERROR (Status)) {\r | |
572 | return Status;\r | |
573 | }\r | |
574 | \r | |
575 | return DhcpSendMessage (DhcpSb, Selected, DhcpSb->Para, DHCP_MSG_REQUEST, NULL);\r | |
576 | }\r | |
577 | \r | |
578 | \r | |
579 | /**\r | |
580 | Terminate the current address acquire. All the allocated resources\r | |
581 | are released. Be careful when calling this function. A rule related\r | |
582 | to this is: only call DhcpEndSession at the highest level, such as\r | |
583 | DhcpInput, DhcpOnTimerTick...At the other level, just return error.\r | |
584 | \r | |
585 | @param[in] DhcpSb The DHCP service instance\r | |
586 | @param[in] Status The result of the DHCP process.\r | |
587 | \r | |
588 | **/\r | |
589 | VOID\r | |
590 | DhcpEndSession (\r | |
591 | IN DHCP_SERVICE *DhcpSb,\r | |
592 | IN EFI_STATUS Status\r | |
593 | )\r | |
594 | {\r | |
595 | if (DHCP_CONNECTED (DhcpSb->DhcpState)) {\r | |
596 | DhcpCallUser (DhcpSb, Dhcp4AddressLost, NULL, NULL);\r | |
597 | } else {\r | |
598 | DhcpCallUser (DhcpSb, Dhcp4Fail, NULL, NULL);\r | |
599 | }\r | |
600 | \r | |
601 | DhcpCleanLease (DhcpSb);\r | |
602 | \r | |
603 | DhcpSb->IoStatus = Status;\r | |
604 | DhcpNotifyUser (DhcpSb, DHCP_NOTIFY_ALL);\r | |
605 | }\r | |
606 | \r | |
607 | \r | |
608 | /**\r | |
609 | Handle packets in DHCP select state.\r | |
610 | \r | |
611 | @param[in] DhcpSb The DHCP service instance\r | |
612 | @param[in] Packet The DHCP packet received\r | |
613 | @param[in] Para The DHCP parameter extracted from the packet. That\r | |
614 | is, all the option value that we care.\r | |
615 | \r | |
616 | @retval EFI_SUCCESS The packet is successfully processed.\r | |
617 | @retval Others Some error occured.\r | |
618 | \r | |
619 | **/\r | |
620 | EFI_STATUS\r | |
621 | DhcpHandleSelect (\r | |
622 | IN DHCP_SERVICE *DhcpSb,\r | |
623 | IN EFI_DHCP4_PACKET *Packet,\r | |
624 | IN DHCP_PARAMETER *Para\r | |
625 | )\r | |
626 | {\r | |
627 | EFI_STATUS Status;\r | |
628 | \r | |
629 | Status = EFI_SUCCESS;\r | |
630 | \r | |
631 | //\r | |
632 | // First validate the message:\r | |
633 | // 1. the offer is a unicast\r | |
634 | // 2. if it is a DHCP message, it must contains a server ID.\r | |
635 | // Don't return a error for these two case otherwise the session is ended.\r | |
636 | //\r | |
637 | if (!DHCP_IS_BOOTP (Para) &&\r | |
638 | ((Para->DhcpType != DHCP_MSG_OFFER) || (Para->ServerId == 0))\r | |
639 | ) {\r | |
640 | goto ON_EXIT;\r | |
641 | }\r | |
642 | \r | |
643 | //\r | |
644 | // Call the user's callback. The action according to the return is as:\r | |
645 | // 1. EFI_SUCESS: stop waiting for more offers, select the offer now\r | |
646 | // 2. EFI_NOT_READY: wait for more offers\r | |
647 | // 3. EFI_ABORTED: abort the address acquiring.\r | |
648 | //\r | |
649 | Status = DhcpCallUser (DhcpSb, Dhcp4RcvdOffer, Packet, NULL);\r | |
650 | \r | |
651 | if (Status == EFI_SUCCESS) {\r | |
652 | if (DhcpSb->LastOffer != NULL) {\r | |
653 | FreePool (DhcpSb->LastOffer);\r | |
654 | }\r | |
655 | \r | |
656 | DhcpSb->LastOffer = Packet;\r | |
657 | \r | |
658 | return DhcpChooseOffer (DhcpSb);\r | |
659 | \r | |
660 | } else if (Status == EFI_NOT_READY) {\r | |
661 | if (DhcpSb->LastOffer != NULL) {\r | |
662 | FreePool (DhcpSb->LastOffer);\r | |
663 | }\r | |
664 | \r | |
665 | DhcpSb->LastOffer = Packet;\r | |
666 | \r | |
667 | } else if (Status == EFI_ABORTED) {\r | |
668 | //\r | |
669 | // DhcpInput will end the session upon error return. Remember\r | |
670 | // only to call DhcpEndSession at the top level call.\r | |
671 | //\r | |
672 | goto ON_EXIT;\r | |
673 | }\r | |
674 | \r | |
675 | return EFI_SUCCESS;\r | |
676 | \r | |
677 | ON_EXIT:\r | |
678 | FreePool (Packet);\r | |
679 | return Status;\r | |
680 | }\r | |
681 | \r | |
682 | \r | |
683 | /**\r | |
684 | Handle packets in DHCP request state.\r | |
685 | \r | |
686 | @param[in] DhcpSb The DHCP service instance\r | |
687 | @param[in] Packet The DHCP packet received\r | |
688 | @param[in] Para The DHCP parameter extracted from the packet. That\r | |
689 | is, all the option value that we care.\r | |
690 | \r | |
691 | @retval EFI_SUCCESS The packet is successfully processed.\r | |
692 | @retval Others Some error occured.\r | |
693 | \r | |
694 | **/\r | |
695 | EFI_STATUS\r | |
696 | DhcpHandleRequest (\r | |
697 | IN DHCP_SERVICE *DhcpSb,\r | |
698 | IN EFI_DHCP4_PACKET *Packet,\r | |
699 | IN DHCP_PARAMETER *Para\r | |
700 | )\r | |
701 | {\r | |
702 | EFI_DHCP4_HEADER *Head;\r | |
703 | EFI_DHCP4_HEADER *Selected;\r | |
704 | EFI_STATUS Status;\r | |
705 | UINT8 *Message;\r | |
706 | \r | |
707 | ASSERT (!DHCP_IS_BOOTP (DhcpSb->Para));\r | |
708 | \r | |
709 | Head = &Packet->Dhcp4.Header;\r | |
710 | Selected = &DhcpSb->Selected->Dhcp4.Header;\r | |
711 | \r | |
712 | //\r | |
713 | // Ignore the BOOTP message and DHCP messages other than DHCP ACK/NACK.\r | |
714 | //\r | |
715 | if (DHCP_IS_BOOTP (Para) ||\r | |
716 | (Para->ServerId != DhcpSb->Para->ServerId) ||\r | |
717 | ((Para->DhcpType != DHCP_MSG_ACK) && (Para->DhcpType != DHCP_MSG_NAK))\r | |
718 | ) {\r | |
719 | \r | |
720 | Status = EFI_SUCCESS;\r | |
721 | goto ON_EXIT;\r | |
722 | }\r | |
723 | \r | |
724 | //\r | |
725 | // Received a NAK, end the session no matter what the user returns\r | |
726 | //\r | |
727 | Status = EFI_DEVICE_ERROR;\r | |
728 | \r | |
729 | if (Para->DhcpType == DHCP_MSG_NAK) {\r | |
730 | DhcpCallUser (DhcpSb, Dhcp4RcvdNak, Packet, NULL);\r | |
731 | goto ON_EXIT;\r | |
732 | }\r | |
733 | \r | |
734 | //\r | |
735 | // Check whether the ACK matches the selected offer\r | |
736 | //\r | |
737 | Message = NULL;\r | |
738 | \r | |
739 | if (!EFI_IP4_EQUAL (&Head->YourAddr, &Selected->YourAddr)) {\r | |
740 | Message = (UINT8 *) "Lease confirmed isn't the same as that in the offer";\r | |
741 | goto REJECT;\r | |
742 | }\r | |
743 | \r | |
744 | Status = DhcpCallUser (DhcpSb, Dhcp4RcvdAck, Packet, NULL);\r | |
745 | \r | |
746 | if (EFI_ERROR (Status)) {\r | |
747 | Message = (UINT8 *) "Lease is denied upon received ACK";\r | |
748 | goto REJECT;\r | |
749 | }\r | |
750 | \r | |
751 | //\r | |
752 | // Record the lease, transit to BOUND state, then notify the user\r | |
753 | //\r | |
754 | Status = DhcpLeaseAcquired (DhcpSb);\r | |
755 | \r | |
756 | if (EFI_ERROR (Status)) {\r | |
757 | Message = (UINT8 *) "Lease is denied upon entering bound";\r | |
758 | goto REJECT;\r | |
759 | }\r | |
760 | \r | |
761 | DhcpSb->IoStatus = EFI_SUCCESS;\r | |
762 | DhcpNotifyUser (DhcpSb, DHCP_NOTIFY_COMPLETION);\r | |
763 | \r | |
764 | FreePool (Packet);\r | |
765 | return EFI_SUCCESS;\r | |
766 | \r | |
767 | REJECT:\r | |
768 | DhcpSendMessage (DhcpSb, DhcpSb->Selected, DhcpSb->Para, DHCP_MSG_DECLINE, Message);\r | |
769 | \r | |
770 | ON_EXIT:\r | |
771 | FreePool (Packet);\r | |
772 | return Status;\r | |
773 | }\r | |
774 | \r | |
775 | \r | |
776 | /**\r | |
777 | Handle packets in DHCP renew/rebound state.\r | |
778 | \r | |
779 | @param[in] DhcpSb The DHCP service instance\r | |
780 | @param[in] Packet The DHCP packet received\r | |
781 | @param[in] Para The DHCP parameter extracted from the packet. That\r | |
782 | is, all the option value that we care.\r | |
783 | \r | |
784 | @retval EFI_SUCCESS The packet is successfully processed.\r | |
785 | @retval Others Some error occured.\r | |
786 | \r | |
787 | **/\r | |
788 | EFI_STATUS\r | |
789 | DhcpHandleRenewRebind (\r | |
790 | IN DHCP_SERVICE *DhcpSb,\r | |
791 | IN EFI_DHCP4_PACKET *Packet,\r | |
792 | IN DHCP_PARAMETER *Para\r | |
793 | )\r | |
794 | {\r | |
795 | EFI_DHCP4_HEADER *Head;\r | |
796 | EFI_DHCP4_HEADER *Selected;\r | |
797 | EFI_STATUS Status;\r | |
798 | \r | |
799 | ASSERT (!DHCP_IS_BOOTP (DhcpSb->Para));\r | |
800 | \r | |
801 | Head = &Packet->Dhcp4.Header;\r | |
802 | Selected = &DhcpSb->Selected->Dhcp4.Header;\r | |
803 | \r | |
804 | //\r | |
805 | // Ignore the BOOTP message and DHCP messages other than DHCP ACK/NACK\r | |
806 | //\r | |
807 | if (DHCP_IS_BOOTP (Para) ||\r | |
808 | (Para->ServerId != DhcpSb->Para->ServerId) ||\r | |
809 | ((Para->DhcpType != DHCP_MSG_ACK) && (Para->DhcpType != DHCP_MSG_NAK))\r | |
810 | ) {\r | |
811 | \r | |
812 | Status = EFI_SUCCESS;\r | |
813 | goto ON_EXIT;\r | |
814 | }\r | |
815 | \r | |
816 | //\r | |
817 | // Received a NAK, ignore the user's return then terminate the process\r | |
818 | //\r | |
819 | Status = EFI_DEVICE_ERROR;\r | |
820 | \r | |
821 | if (Para->DhcpType == DHCP_MSG_NAK) {\r | |
822 | DhcpCallUser (DhcpSb, Dhcp4RcvdNak, Packet, NULL);\r | |
823 | goto ON_EXIT;\r | |
824 | }\r | |
825 | \r | |
826 | //\r | |
827 | // The lease is different from the selected. Don't send a DECLINE\r | |
828 | // since it isn't existed in the client's FSM.\r | |
829 | //\r | |
830 | if (!EFI_IP4_EQUAL (&Head->YourAddr, &Selected->YourAddr)) {\r | |
831 | goto ON_EXIT;\r | |
832 | }\r | |
833 | \r | |
834 | Status = DhcpCallUser (DhcpSb, Dhcp4RcvdAck, Packet, NULL);\r | |
835 | \r | |
836 | if (EFI_ERROR (Status)) {\r | |
837 | goto ON_EXIT;\r | |
838 | }\r | |
839 | \r | |
840 | //\r | |
841 | // Record the lease, start timer for T1 and T2,\r | |
842 | //\r | |
843 | DhcpComputeLease (DhcpSb, Para);\r | |
844 | DhcpSb->LeaseLife = 0;\r | |
845 | DhcpSetState (DhcpSb, Dhcp4Bound, TRUE);\r | |
846 | \r | |
847 | if (DhcpSb->ExtraRefresh != 0) {\r | |
848 | DhcpSb->ExtraRefresh = FALSE;\r | |
849 | \r | |
850 | DhcpSb->IoStatus = EFI_SUCCESS;\r | |
851 | DhcpNotifyUser (DhcpSb, DHCP_NOTIFY_RENEWREBIND);\r | |
852 | }\r | |
853 | \r | |
854 | ON_EXIT:\r | |
855 | FreePool (Packet);\r | |
856 | return Status;\r | |
857 | }\r | |
858 | \r | |
859 | \r | |
860 | /**\r | |
861 | Handle packets in DHCP reboot state.\r | |
862 | \r | |
863 | @param[in] DhcpSb The DHCP service instance\r | |
864 | @param[in] Packet The DHCP packet received\r | |
865 | @param[in] Para The DHCP parameter extracted from the packet. That\r | |
866 | is, all the option value that we care.\r | |
867 | \r | |
868 | @retval EFI_SUCCESS The packet is successfully processed.\r | |
869 | @retval Others Some error occured.\r | |
870 | \r | |
871 | **/\r | |
872 | EFI_STATUS\r | |
873 | DhcpHandleReboot (\r | |
874 | IN DHCP_SERVICE *DhcpSb,\r | |
875 | IN EFI_DHCP4_PACKET *Packet,\r | |
876 | IN DHCP_PARAMETER *Para\r | |
877 | )\r | |
878 | {\r | |
879 | EFI_DHCP4_HEADER *Head;\r | |
880 | EFI_STATUS Status;\r | |
881 | \r | |
882 | Head = &Packet->Dhcp4.Header;\r | |
883 | \r | |
884 | //\r | |
885 | // Ignore the BOOTP message and DHCP messages other than DHCP ACK/NACK\r | |
886 | //\r | |
887 | if (DHCP_IS_BOOTP (Para) ||\r | |
888 | ((Para->DhcpType != DHCP_MSG_ACK) && (Para->DhcpType != DHCP_MSG_NAK))\r | |
889 | ) {\r | |
890 | \r | |
891 | Status = EFI_SUCCESS;\r | |
892 | goto ON_EXIT;\r | |
893 | }\r | |
894 | \r | |
895 | //\r | |
896 | // If a NAK is received, transit to INIT and try again.\r | |
897 | //\r | |
898 | if (Para->DhcpType == DHCP_MSG_NAK) {\r | |
899 | DhcpCallUser (DhcpSb, Dhcp4RcvdNak, Packet, NULL);\r | |
900 | \r | |
901 | DhcpSb->ClientAddr = 0;\r | |
902 | DhcpSb->DhcpState = Dhcp4Init;\r | |
903 | \r | |
904 | Status = DhcpInitRequest (DhcpSb);\r | |
905 | goto ON_EXIT;\r | |
906 | }\r | |
907 | \r | |
908 | //\r | |
909 | // Check whether the ACK matches the selected offer\r | |
910 | //\r | |
911 | if (EFI_NTOHL (Head->YourAddr) != DhcpSb->ClientAddr) {\r | |
912 | Status = EFI_DEVICE_ERROR;\r | |
913 | goto ON_EXIT;\r | |
914 | }\r | |
915 | \r | |
916 | Status = DhcpCallUser (DhcpSb, Dhcp4RcvdAck, Packet, NULL);\r | |
917 | if (EFI_ERROR (Status)) {\r | |
918 | goto ON_EXIT;\r | |
919 | }\r | |
920 | \r | |
921 | //\r | |
922 | // OK, get the parameter from server, record the lease\r | |
923 | //\r | |
924 | DhcpSb->Para = AllocateCopyPool (sizeof (DHCP_PARAMETER), Para);\r | |
925 | if (DhcpSb->Para == NULL) {\r | |
926 | Status = EFI_OUT_OF_RESOURCES;\r | |
927 | goto ON_EXIT;\r | |
928 | }\r | |
929 | \r | |
930 | DhcpSb->Selected = Packet;\r | |
931 | Status = DhcpLeaseAcquired (DhcpSb);\r | |
932 | if (EFI_ERROR (Status)) {\r | |
933 | return Status;\r | |
934 | }\r | |
935 | \r | |
936 | DhcpSb->IoStatus = EFI_SUCCESS;\r | |
937 | DhcpNotifyUser (DhcpSb, DHCP_NOTIFY_COMPLETION);\r | |
938 | return EFI_SUCCESS;\r | |
939 | \r | |
940 | ON_EXIT:\r | |
941 | FreePool (Packet);\r | |
942 | return Status;\r | |
943 | }\r | |
944 | \r | |
945 | \r | |
946 | /**\r | |
947 | Handle the received DHCP packets. This function drives the DHCP\r | |
948 | state machine.\r | |
949 | \r | |
950 | @param UdpPacket The UDP packets received.\r | |
951 | @param EndPoint The local/remote UDP access point\r | |
952 | @param IoStatus The status of the UDP receive\r | |
953 | @param Context The opaque parameter to the function.\r | |
954 | \r | |
955 | **/\r | |
956 | VOID\r | |
957 | EFIAPI\r | |
958 | DhcpInput (\r | |
959 | NET_BUF *UdpPacket,\r | |
960 | UDP_END_POINT *EndPoint,\r | |
961 | EFI_STATUS IoStatus,\r | |
962 | VOID *Context\r | |
963 | )\r | |
964 | {\r | |
965 | DHCP_SERVICE *DhcpSb;\r | |
966 | EFI_DHCP4_HEADER *Head;\r | |
967 | EFI_DHCP4_PACKET *Packet;\r | |
968 | DHCP_PARAMETER *Para;\r | |
969 | EFI_STATUS Status;\r | |
970 | UINT32 Len;\r | |
971 | \r | |
972 | Packet = NULL;\r | |
973 | DhcpSb = (DHCP_SERVICE *) Context;\r | |
974 | \r | |
975 | //\r | |
976 | // Don't restart receive if error occurs or DHCP is destroyed.\r | |
977 | //\r | |
978 | if (EFI_ERROR (IoStatus)) {\r | |
979 | return ;\r | |
980 | } else if (DhcpSb->ServiceState == DHCP_DESTROY) {\r | |
981 | NetbufFree (UdpPacket);\r | |
982 | return ;\r | |
983 | }\r | |
984 | \r | |
985 | ASSERT (UdpPacket != NULL);\r | |
986 | \r | |
987 | if (DhcpSb->DhcpState == Dhcp4Stopped) {\r | |
988 | goto RESTART;\r | |
989 | }\r | |
990 | \r | |
991 | //\r | |
992 | // Validate the packet received\r | |
993 | //\r | |
994 | if (UdpPacket->TotalSize < sizeof (EFI_DHCP4_HEADER)) {\r | |
995 | goto RESTART;\r | |
996 | }\r | |
997 | \r | |
998 | //\r | |
999 | // Copy the DHCP message to a continuous memory block\r | |
1000 | //\r | |
1001 | Len = sizeof (EFI_DHCP4_PACKET) + UdpPacket->TotalSize - sizeof (EFI_DHCP4_HEADER);\r | |
1002 | Packet = (EFI_DHCP4_PACKET *) AllocatePool (Len);\r | |
1003 | \r | |
1004 | if (Packet == NULL) {\r | |
1005 | goto RESTART;\r | |
1006 | }\r | |
1007 | \r | |
1008 | Packet->Size = Len;\r | |
1009 | Head = &Packet->Dhcp4.Header;\r | |
1010 | Packet->Length = NetbufCopy (UdpPacket, 0, UdpPacket->TotalSize, (UINT8 *) Head);\r | |
1011 | \r | |
1012 | if (Packet->Length != UdpPacket->TotalSize) {\r | |
1013 | goto RESTART;\r | |
1014 | }\r | |
1015 | \r | |
1016 | //\r | |
1017 | // Is this packet the answer to our packet?\r | |
1018 | //\r | |
1019 | if ((Head->OpCode != BOOTP_REPLY) ||\r | |
1020 | (NTOHL (Head->Xid) != DhcpSb->Xid) ||\r | |
1021 | (CompareMem (DhcpSb->ClientAddressSendOut, Head->ClientHwAddr, Head->HwAddrLen) != 0)) {\r | |
1022 | goto RESTART;\r | |
1023 | }\r | |
1024 | \r | |
1025 | //\r | |
1026 | // Validate the options and retrieve the interested options\r | |
1027 | //\r | |
1028 | Para = NULL;\r | |
1029 | if ((Packet->Length > sizeof (EFI_DHCP4_HEADER) + sizeof (UINT32)) &&\r | |
1030 | (Packet->Dhcp4.Magik == DHCP_OPTION_MAGIC) &&\r | |
1031 | EFI_ERROR (DhcpValidateOptions (Packet, &Para))) {\r | |
1032 | \r | |
1033 | goto RESTART;\r | |
1034 | }\r | |
1035 | \r | |
1036 | //\r | |
1037 | // Call the handler for each state. The handler should return\r | |
1038 | // EFI_SUCCESS if the process can go on no matter whether the\r | |
1039 | // packet is ignored or not. If the return is EFI_ERROR, the\r | |
1040 | // session will be terminated. Packet's ownership is handled\r | |
1041 | // over to the handlers. If operation succeeds, the handler\r | |
1042 | // must notify the user. It isn't necessary to do if EFI_ERROR\r | |
1043 | // is returned because the DhcpEndSession will notify the user.\r | |
1044 | //\r | |
1045 | Status = EFI_SUCCESS;\r | |
1046 | \r | |
1047 | switch (DhcpSb->DhcpState) {\r | |
1048 | case Dhcp4Selecting:\r | |
1049 | Status = DhcpHandleSelect (DhcpSb, Packet, Para);\r | |
1050 | break;\r | |
1051 | \r | |
1052 | case Dhcp4Requesting:\r | |
1053 | Status = DhcpHandleRequest (DhcpSb, Packet, Para);\r | |
1054 | break;\r | |
1055 | \r | |
1056 | case Dhcp4InitReboot:\r | |
1057 | case Dhcp4Init:\r | |
1058 | case Dhcp4Bound:\r | |
1059 | //\r | |
1060 | // Ignore the packet in INITREBOOT, INIT and BOUND states\r | |
1061 | //\r | |
1062 | FreePool (Packet);\r | |
1063 | Status = EFI_SUCCESS;\r | |
1064 | break;\r | |
1065 | \r | |
1066 | case Dhcp4Renewing:\r | |
1067 | case Dhcp4Rebinding:\r | |
1068 | Status = DhcpHandleRenewRebind (DhcpSb, Packet, Para);\r | |
1069 | break;\r | |
1070 | \r | |
1071 | case Dhcp4Rebooting:\r | |
1072 | Status = DhcpHandleReboot (DhcpSb, Packet, Para);\r | |
1073 | break;\r | |
1074 | }\r | |
1075 | \r | |
1076 | if (Para != NULL) {\r | |
1077 | FreePool (Para);\r | |
1078 | }\r | |
1079 | \r | |
1080 | Packet = NULL;\r | |
1081 | \r | |
1082 | if (EFI_ERROR (Status)) {\r | |
1083 | NetbufFree (UdpPacket);\r | |
1084 | UdpIoRecvDatagram (DhcpSb->UdpIo, DhcpInput, DhcpSb, 0);\r | |
1085 | DhcpEndSession (DhcpSb, Status);\r | |
1086 | return ;\r | |
1087 | }\r | |
1088 | \r | |
1089 | RESTART:\r | |
1090 | NetbufFree (UdpPacket);\r | |
1091 | \r | |
1092 | if (Packet != NULL) {\r | |
1093 | FreePool (Packet);\r | |
1094 | }\r | |
1095 | \r | |
1096 | Status = UdpIoRecvDatagram (DhcpSb->UdpIo, DhcpInput, DhcpSb, 0);\r | |
1097 | \r | |
1098 | if (EFI_ERROR (Status)) {\r | |
1099 | DhcpEndSession (DhcpSb, EFI_DEVICE_ERROR);\r | |
1100 | }\r | |
1101 | }\r | |
1102 | \r | |
1103 | \r | |
1104 | /**\r | |
1105 | Release the packet.\r | |
1106 | \r | |
1107 | @param[in] Arg The packet to release\r | |
1108 | \r | |
1109 | **/\r | |
1110 | VOID\r | |
1111 | EFIAPI\r | |
1112 | DhcpReleasePacket (\r | |
1113 | IN VOID *Arg\r | |
1114 | )\r | |
1115 | {\r | |
1116 | FreePool (Arg);\r | |
1117 | }\r | |
1118 | \r | |
1119 | \r | |
1120 | /**\r | |
1121 | Release the net buffer when packet is sent.\r | |
1122 | \r | |
1123 | @param UdpPacket The UDP packets received.\r | |
1124 | @param EndPoint The local/remote UDP access point\r | |
1125 | @param IoStatus The status of the UDP receive\r | |
1126 | @param Context The opaque parameter to the function.\r | |
1127 | \r | |
1128 | **/\r | |
1129 | VOID\r | |
1130 | EFIAPI\r | |
1131 | DhcpOnPacketSent (\r | |
1132 | NET_BUF *Packet,\r | |
1133 | UDP_END_POINT *EndPoint,\r | |
1134 | EFI_STATUS IoStatus,\r | |
1135 | VOID *Context\r | |
1136 | )\r | |
1137 | {\r | |
1138 | NetbufFree (Packet);\r | |
1139 | }\r | |
1140 | \r | |
1141 | \r | |
1142 | \r | |
1143 | /**\r | |
1144 | Build and transmit a DHCP message according to the current states.\r | |
1145 | This function implement the Table 5. of RFC 2131. Always transits\r | |
1146 | the state (as defined in Figure 5. of the same RFC) before sending\r | |
1147 | a DHCP message. The table is adjusted accordingly.\r | |
1148 | \r | |
1149 | @param[in] DhcpSb The DHCP service instance\r | |
1150 | @param[in] Seed The seed packet which the new packet is based on\r | |
1151 | @param[in] Para The DHCP parameter of the Seed packet\r | |
1152 | @param[in] Type The message type to send\r | |
1153 | @param[in] Msg The human readable message to include in the packet\r | |
1154 | sent.\r | |
1155 | \r | |
1156 | @retval EFI_OUT_OF_RESOURCES Failed to allocate resources for the packet\r | |
1157 | @retval EFI_ACCESS_DENIED Failed to transmit the packet through UDP\r | |
1158 | @retval EFI_SUCCESS The message is sent\r | |
1159 | @retval other Other error occurs\r | |
1160 | \r | |
1161 | **/\r | |
1162 | EFI_STATUS\r | |
1163 | DhcpSendMessage (\r | |
1164 | IN DHCP_SERVICE *DhcpSb,\r | |
1165 | IN EFI_DHCP4_PACKET *Seed,\r | |
1166 | IN DHCP_PARAMETER *Para,\r | |
1167 | IN UINT8 Type,\r | |
1168 | IN UINT8 *Msg\r | |
1169 | )\r | |
1170 | {\r | |
1171 | EFI_DHCP4_CONFIG_DATA *Config;\r | |
1172 | EFI_DHCP4_PACKET *Packet;\r | |
1173 | EFI_DHCP4_PACKET *NewPacket;\r | |
1174 | EFI_DHCP4_HEADER *Head;\r | |
1175 | EFI_DHCP4_HEADER *SeedHead;\r | |
1176 | UDP_IO *UdpIo;\r | |
1177 | UDP_END_POINT EndPoint;\r | |
1178 | NET_BUF *Wrap;\r | |
1179 | NET_FRAGMENT Frag;\r | |
1180 | EFI_STATUS Status;\r | |
1181 | IP4_ADDR IpAddr;\r | |
1182 | UINT8 *Buf;\r | |
1183 | UINT16 MaxMsg;\r | |
1184 | UINT32 Len;\r | |
1185 | UINT32 Index;\r | |
1186 | \r | |
1187 | //\r | |
1188 | // Allocate a big enough memory block to hold the DHCP packet\r | |
1189 | //\r | |
1190 | Len = sizeof (EFI_DHCP4_PACKET) + 128 + DhcpSb->UserOptionLen;\r | |
1191 | \r | |
1192 | if (Msg != NULL) {\r | |
1193 | Len += (UINT32)AsciiStrLen ((CHAR8 *) Msg);\r | |
1194 | }\r | |
1195 | \r | |
1196 | Packet = AllocatePool (Len);\r | |
1197 | \r | |
1198 | if (Packet == NULL) {\r | |
1199 | return EFI_OUT_OF_RESOURCES;\r | |
1200 | }\r | |
1201 | \r | |
1202 | Packet->Size = Len;\r | |
1203 | Packet->Length = sizeof (EFI_DHCP4_HEADER) + sizeof (UINT32);\r | |
1204 | \r | |
1205 | //\r | |
1206 | // Fill in the DHCP header fields\r | |
1207 | //\r | |
1208 | Config = &DhcpSb->ActiveConfig;\r | |
1209 | SeedHead = NULL;\r | |
1210 | \r | |
1211 | if (Seed != NULL) {\r | |
1212 | SeedHead = &Seed->Dhcp4.Header;\r | |
1213 | }\r | |
1214 | \r | |
1215 | Head = &Packet->Dhcp4.Header;\r | |
1216 | ZeroMem (Head, sizeof (EFI_DHCP4_HEADER));\r | |
1217 | \r | |
1218 | Head->OpCode = BOOTP_REQUEST;\r | |
1219 | Head->HwType = DhcpSb->HwType;\r | |
1220 | Head->HwAddrLen = DhcpSb->HwLen;\r | |
1221 | Head->Xid = HTONL (DhcpSb->Xid);\r | |
1222 | Head->Reserved = HTONS (0x8000); //Server, broadcast the message please.\r | |
1223 | \r | |
1224 | EFI_IP4 (Head->ClientAddr) = HTONL (DhcpSb->ClientAddr);\r | |
1225 | CopyMem (Head->ClientHwAddr, DhcpSb->Mac.Addr, DhcpSb->HwLen);\r | |
1226 | \r | |
1227 | if ((Type == DHCP_MSG_DECLINE) || (Type == DHCP_MSG_RELEASE)) {\r | |
1228 | Head->Seconds = 0;\r | |
1229 | } else if ((Type == DHCP_MSG_REQUEST) && (DhcpSb->DhcpState == Dhcp4Requesting)) {\r | |
1230 | //\r | |
1231 | // Use the same value as the original DHCPDISCOVER message.\r | |
1232 | //\r | |
1233 | Head->Seconds = DhcpSb->LastPacket->Dhcp4.Header.Seconds;\r | |
1234 | } else {\r | |
1235 | SetElapsedTime(&Head->Seconds, DhcpSb->ActiveChild);\r | |
1236 | }\r | |
1237 | \r | |
1238 | //\r | |
1239 | // Append the DHCP message type\r | |
1240 | //\r | |
1241 | Packet->Dhcp4.Magik = DHCP_OPTION_MAGIC;\r | |
1242 | Buf = Packet->Dhcp4.Option;\r | |
1243 | Buf = DhcpAppendOption (Buf, DHCP_TAG_TYPE, 1, &Type);\r | |
1244 | \r | |
1245 | //\r | |
1246 | // Append the serverid option if necessary:\r | |
1247 | // 1. DHCP decline message\r | |
1248 | // 2. DHCP release message\r | |
1249 | // 3. DHCP request to confirm one lease.\r | |
1250 | //\r | |
1251 | if ((Type == DHCP_MSG_DECLINE) || (Type == DHCP_MSG_RELEASE) ||\r | |
1252 | ((Type == DHCP_MSG_REQUEST) && (DhcpSb->DhcpState == Dhcp4Requesting))\r | |
1253 | ) {\r | |
1254 | \r | |
1255 | ASSERT ((Para != NULL) && (Para->ServerId != 0));\r | |
1256 | \r | |
1257 | IpAddr = HTONL (Para->ServerId);\r | |
1258 | Buf = DhcpAppendOption (Buf, DHCP_TAG_SERVER_ID, 4, (UINT8 *) &IpAddr);\r | |
1259 | }\r | |
1260 | \r | |
1261 | //\r | |
1262 | // Append the requested IP option if necessary:\r | |
1263 | // 1. DHCP request to use the previously allocated address\r | |
1264 | // 2. DHCP request to confirm one lease\r | |
1265 | // 3. DHCP decline to decline one lease\r | |
1266 | //\r | |
1267 | IpAddr = 0;\r | |
1268 | \r | |
1269 | if (Type == DHCP_MSG_REQUEST) {\r | |
1270 | if (DhcpSb->DhcpState == Dhcp4Rebooting) {\r | |
1271 | IpAddr = EFI_IP4 (Config->ClientAddress);\r | |
1272 | \r | |
1273 | } else if (DhcpSb->DhcpState == Dhcp4Requesting) {\r | |
1274 | ASSERT (SeedHead != NULL);\r | |
1275 | IpAddr = EFI_IP4 (SeedHead->YourAddr);\r | |
1276 | }\r | |
1277 | \r | |
1278 | } else if (Type == DHCP_MSG_DECLINE) {\r | |
1279 | ASSERT (SeedHead != NULL);\r | |
1280 | IpAddr = EFI_IP4 (SeedHead->YourAddr);\r | |
1281 | }\r | |
1282 | \r | |
1283 | if (IpAddr != 0) {\r | |
1284 | Buf = DhcpAppendOption (Buf, DHCP_TAG_REQUEST_IP, 4, (UINT8 *) &IpAddr);\r | |
1285 | }\r | |
1286 | \r | |
1287 | //\r | |
1288 | // Append the Max Message Length option if it isn't a DECLINE\r | |
1289 | // or RELEASE to direct the server use large messages instead of\r | |
1290 | // override the BOOTFILE and SERVER fields in the message head.\r | |
1291 | //\r | |
1292 | if ((Type != DHCP_MSG_DECLINE) && (Type != DHCP_MSG_RELEASE)) {\r | |
1293 | MaxMsg = HTONS (0xFF00);\r | |
1294 | Buf = DhcpAppendOption (Buf, DHCP_TAG_MAXMSG, 2, (UINT8 *) &MaxMsg);\r | |
1295 | }\r | |
1296 | \r | |
1297 | //\r | |
1298 | // Append the user's message if it isn't NULL\r | |
1299 | //\r | |
1300 | if (Msg != NULL) {\r | |
1301 | Len = MIN ((UINT32) AsciiStrLen ((CHAR8 *) Msg), 255);\r | |
1302 | Buf = DhcpAppendOption (Buf, DHCP_TAG_MESSAGE, (UINT16) Len, Msg);\r | |
1303 | }\r | |
1304 | \r | |
1305 | //\r | |
1306 | // Append the user configured options\r | |
1307 | //\r | |
1308 | if (DhcpSb->UserOptionLen != 0) {\r | |
1309 | for (Index = 0; Index < Config->OptionCount; Index++) {\r | |
1310 | //\r | |
1311 | // We can't use any option other than the client ID from user\r | |
1312 | // if it is a DHCP decline or DHCP release .\r | |
1313 | //\r | |
1314 | if (((Type == DHCP_MSG_DECLINE) || (Type == DHCP_MSG_RELEASE)) &&\r | |
1315 | (Config->OptionList[Index]->OpCode != DHCP_TAG_CLIENT_ID)) {\r | |
1316 | continue;\r | |
1317 | }\r | |
1318 | \r | |
1319 | Buf = DhcpAppendOption (\r | |
1320 | Buf,\r | |
1321 | Config->OptionList[Index]->OpCode,\r | |
1322 | Config->OptionList[Index]->Length,\r | |
1323 | Config->OptionList[Index]->Data\r | |
1324 | );\r | |
1325 | }\r | |
1326 | }\r | |
1327 | \r | |
1328 | *(Buf++) = DHCP_TAG_EOP;\r | |
1329 | Packet->Length += (UINT32) (Buf - Packet->Dhcp4.Option);\r | |
1330 | \r | |
1331 | //\r | |
1332 | // OK, the message is built, call the user to override it.\r | |
1333 | //\r | |
1334 | Status = EFI_SUCCESS;\r | |
1335 | NewPacket = NULL;\r | |
1336 | \r | |
1337 | if (Type == DHCP_MSG_DISCOVER) {\r | |
1338 | Status = DhcpCallUser (DhcpSb, Dhcp4SendDiscover, Packet, &NewPacket);\r | |
1339 | \r | |
1340 | } else if (Type == DHCP_MSG_REQUEST) {\r | |
1341 | Status = DhcpCallUser (DhcpSb, Dhcp4SendRequest, Packet, &NewPacket);\r | |
1342 | \r | |
1343 | } else if (Type == DHCP_MSG_DECLINE) {\r | |
1344 | Status = DhcpCallUser (DhcpSb, Dhcp4SendDecline, Packet, &NewPacket);\r | |
1345 | }\r | |
1346 | \r | |
1347 | if (EFI_ERROR (Status)) {\r | |
1348 | FreePool (Packet);\r | |
1349 | return Status;\r | |
1350 | }\r | |
1351 | \r | |
1352 | if (NewPacket != NULL) {\r | |
1353 | FreePool (Packet);\r | |
1354 | Packet = NewPacket;\r | |
1355 | }\r | |
1356 | \r | |
1357 | //\r | |
1358 | // Save the Client Address will be sent out\r | |
1359 | //\r | |
1360 | CopyMem (\r | |
1361 | &DhcpSb->ClientAddressSendOut[0],\r | |
1362 | &Packet->Dhcp4.Header.ClientHwAddr[0],\r | |
1363 | Packet->Dhcp4.Header.HwAddrLen\r | |
1364 | );\r | |
1365 | \r | |
1366 | \r | |
1367 | //\r | |
1368 | // Wrap it into a netbuf then send it.\r | |
1369 | //\r | |
1370 | Frag.Bulk = (UINT8 *) &Packet->Dhcp4.Header;\r | |
1371 | Frag.Len = Packet->Length;\r | |
1372 | Wrap = NetbufFromExt (&Frag, 1, 0, 0, DhcpReleasePacket, Packet);\r | |
1373 | \r | |
1374 | if (Wrap == NULL) {\r | |
1375 | FreePool (Packet);\r | |
1376 | return EFI_OUT_OF_RESOURCES;\r | |
1377 | }\r | |
1378 | \r | |
1379 | //\r | |
1380 | // Save it as the last sent packet for retransmission\r | |
1381 | //\r | |
1382 | if (DhcpSb->LastPacket != NULL) {\r | |
1383 | FreePool (DhcpSb->LastPacket);\r | |
1384 | }\r | |
1385 | \r | |
1386 | DhcpSb->LastPacket = Packet;\r | |
1387 | DhcpSetTransmitTimer (DhcpSb);\r | |
1388 | \r | |
1389 | //\r | |
1390 | // Broadcast the message, unless we know the server address.\r | |
1391 | // Use the lease UdpIo port to send the unicast packet.\r | |
1392 | //\r | |
1393 | EndPoint.RemoteAddr.Addr[0] = 0xffffffff;\r | |
1394 | EndPoint.LocalAddr.Addr[0] = 0;\r | |
1395 | EndPoint.RemotePort = DHCP_SERVER_PORT;\r | |
1396 | EndPoint.LocalPort = DHCP_CLIENT_PORT;\r | |
1397 | UdpIo = DhcpSb->UdpIo;\r | |
1398 | \r | |
1399 | if ((DhcpSb->DhcpState == Dhcp4Renewing) || (Type == DHCP_MSG_RELEASE)) {\r | |
1400 | EndPoint.RemoteAddr.Addr[0] = DhcpSb->ServerAddr;\r | |
1401 | EndPoint.LocalAddr.Addr[0] = DhcpSb->ClientAddr;\r | |
1402 | UdpIo = DhcpSb->LeaseIoPort;\r | |
1403 | }\r | |
1404 | \r | |
1405 | ASSERT (UdpIo != NULL);\r | |
1406 | NET_GET_REF (Wrap);\r | |
1407 | \r | |
1408 | Status = UdpIoSendDatagram (\r | |
1409 | UdpIo, \r | |
1410 | Wrap, \r | |
1411 | &EndPoint, \r | |
1412 | NULL, \r | |
1413 | DhcpOnPacketSent, \r | |
1414 | DhcpSb\r | |
1415 | );\r | |
1416 | \r | |
1417 | if (EFI_ERROR (Status)) {\r | |
1418 | NET_PUT_REF (Wrap);\r | |
1419 | return EFI_ACCESS_DENIED;\r | |
1420 | }\r | |
1421 | \r | |
1422 | return EFI_SUCCESS;\r | |
1423 | }\r | |
1424 | \r | |
1425 | \r | |
1426 | /**\r | |
1427 | Retransmit a saved packet. Only DISCOVER and REQUEST messages\r | |
1428 | will be retransmitted.\r | |
1429 | \r | |
1430 | @param[in] DhcpSb The DHCP service instance\r | |
1431 | \r | |
1432 | @retval EFI_ACCESS_DENIED Failed to transmit packet through UDP port\r | |
1433 | @retval EFI_SUCCESS The packet is retransmitted.\r | |
1434 | \r | |
1435 | **/\r | |
1436 | EFI_STATUS\r | |
1437 | DhcpRetransmit (\r | |
1438 | IN DHCP_SERVICE *DhcpSb\r | |
1439 | )\r | |
1440 | {\r | |
1441 | UDP_IO *UdpIo;\r | |
1442 | UDP_END_POINT EndPoint;\r | |
1443 | NET_BUF *Wrap;\r | |
1444 | NET_FRAGMENT Frag;\r | |
1445 | EFI_STATUS Status;\r | |
1446 | \r | |
1447 | ASSERT (DhcpSb->LastPacket != NULL);\r | |
1448 | \r | |
1449 | //\r | |
1450 | // For REQUEST message in Dhcp4Requesting state, do not change the secs fields.\r | |
1451 | //\r | |
1452 | if (DhcpSb->DhcpState != Dhcp4Requesting) {\r | |
1453 | SetElapsedTime(&DhcpSb->LastPacket->Dhcp4.Header.Seconds, DhcpSb->ActiveChild);\r | |
1454 | }\r | |
1455 | \r | |
1456 | //\r | |
1457 | // Wrap it into a netbuf then send it.\r | |
1458 | //\r | |
1459 | Frag.Bulk = (UINT8 *) &DhcpSb->LastPacket->Dhcp4.Header;\r | |
1460 | Frag.Len = DhcpSb->LastPacket->Length;\r | |
1461 | Wrap = NetbufFromExt (&Frag, 1, 0, 0, DhcpReleasePacket, DhcpSb->LastPacket);\r | |
1462 | \r | |
1463 | if (Wrap == NULL) {\r | |
1464 | return EFI_OUT_OF_RESOURCES;\r | |
1465 | }\r | |
1466 | \r | |
1467 | //\r | |
1468 | // Broadcast the message, unless we know the server address.\r | |
1469 | //\r | |
1470 | EndPoint.RemotePort = DHCP_SERVER_PORT;\r | |
1471 | EndPoint.LocalPort = DHCP_CLIENT_PORT;\r | |
1472 | EndPoint.RemoteAddr.Addr[0] = 0xffffffff;\r | |
1473 | EndPoint.LocalAddr.Addr[0] = 0;\r | |
1474 | UdpIo = DhcpSb->UdpIo;\r | |
1475 | \r | |
1476 | if (DhcpSb->DhcpState == Dhcp4Renewing) {\r | |
1477 | EndPoint.RemoteAddr.Addr[0] = DhcpSb->ServerAddr;\r | |
1478 | EndPoint.LocalAddr.Addr[0] = DhcpSb->ClientAddr;\r | |
1479 | UdpIo = DhcpSb->LeaseIoPort;\r | |
1480 | }\r | |
1481 | \r | |
1482 | ASSERT (UdpIo != NULL);\r | |
1483 | \r | |
1484 | NET_GET_REF (Wrap);\r | |
1485 | Status = UdpIoSendDatagram (\r | |
1486 | UdpIo,\r | |
1487 | Wrap,\r | |
1488 | &EndPoint,\r | |
1489 | NULL,\r | |
1490 | DhcpOnPacketSent,\r | |
1491 | DhcpSb\r | |
1492 | );\r | |
1493 | \r | |
1494 | if (EFI_ERROR (Status)) {\r | |
1495 | NET_PUT_REF (Wrap);\r | |
1496 | return EFI_ACCESS_DENIED;\r | |
1497 | }\r | |
1498 | \r | |
1499 | return EFI_SUCCESS;\r | |
1500 | }\r | |
1501 | \r | |
1502 | \r | |
1503 | /**\r | |
1504 | Each DHCP service has three timer. Two of them are count down timer.\r | |
1505 | One for the packet retransmission. The other is to collect the offers.\r | |
1506 | The third timer increaments the lease life which is compared to T1, T2,\r | |
1507 | and lease to determine the time to renew and rebind the lease.\r | |
1508 | DhcpOnTimerTick will be called once every second.\r | |
1509 | \r | |
1510 | @param[in] Event The timer event\r | |
1511 | @param[in] Context The context, which is the DHCP service instance.\r | |
1512 | \r | |
1513 | **/\r | |
1514 | VOID\r | |
1515 | EFIAPI\r | |
1516 | DhcpOnTimerTick (\r | |
1517 | IN EFI_EVENT Event,\r | |
1518 | IN VOID *Context\r | |
1519 | )\r | |
1520 | {\r | |
1521 | LIST_ENTRY *Entry;\r | |
1522 | LIST_ENTRY *Next;\r | |
1523 | DHCP_SERVICE *DhcpSb;\r | |
1524 | DHCP_PROTOCOL *Instance;\r | |
1525 | EFI_STATUS Status;\r | |
1526 | \r | |
1527 | DhcpSb = (DHCP_SERVICE *) Context;\r | |
1528 | Instance = DhcpSb->ActiveChild;\r | |
1529 | \r | |
1530 | //\r | |
1531 | // 0xffff is the maximum supported value for elapsed time according to RFC.\r | |
1532 | //\r | |
1533 | if (Instance != NULL && Instance->ElaspedTime < 0xffff) {\r | |
1534 | Instance->ElaspedTime++;\r | |
1535 | }\r | |
1536 | \r | |
1537 | //\r | |
1538 | // Check the retransmit timer\r | |
1539 | //\r | |
1540 | if ((DhcpSb->PacketToLive > 0) && (--DhcpSb->PacketToLive == 0)) {\r | |
1541 | \r | |
1542 | //\r | |
1543 | // Select offer at each timeout if any offer received.\r | |
1544 | //\r | |
1545 | if (DhcpSb->DhcpState == Dhcp4Selecting && DhcpSb->LastOffer != NULL) {\r | |
1546 | \r | |
1547 | Status = DhcpChooseOffer (DhcpSb);\r | |
1548 | \r | |
1549 | if (EFI_ERROR(Status)) {\r | |
1550 | if (DhcpSb->LastOffer != NULL) {\r | |
1551 | FreePool (DhcpSb->LastOffer);\r | |
1552 | DhcpSb->LastOffer = NULL;\r | |
1553 | }\r | |
1554 | } else {\r | |
1555 | goto ON_EXIT;\r | |
1556 | }\r | |
1557 | }\r | |
1558 | \r | |
1559 | if (++DhcpSb->CurRetry < DhcpSb->MaxRetries) {\r | |
1560 | //\r | |
1561 | // Still has another try\r | |
1562 | //\r | |
1563 | DhcpRetransmit (DhcpSb);\r | |
1564 | DhcpSetTransmitTimer (DhcpSb);\r | |
1565 | \r | |
1566 | } else if (DHCP_CONNECTED (DhcpSb->DhcpState)) {\r | |
1567 | \r | |
1568 | //\r | |
1569 | // Retransmission failed, if the DHCP request is initiated by\r | |
1570 | // user, adjust the current state according to the lease life.\r | |
1571 | // Otherwise do nothing to wait the lease to timeout\r | |
1572 | //\r | |
1573 | if (DhcpSb->ExtraRefresh != 0) {\r | |
1574 | Status = EFI_SUCCESS;\r | |
1575 | \r | |
1576 | if (DhcpSb->LeaseLife < DhcpSb->T1) {\r | |
1577 | Status = DhcpSetState (DhcpSb, Dhcp4Bound, FALSE);\r | |
1578 | \r | |
1579 | } else if (DhcpSb->LeaseLife < DhcpSb->T2) {\r | |
1580 | Status = DhcpSetState (DhcpSb, Dhcp4Renewing, FALSE);\r | |
1581 | \r | |
1582 | } else if (DhcpSb->LeaseLife < DhcpSb->Lease) {\r | |
1583 | Status = DhcpSetState (DhcpSb, Dhcp4Rebinding, FALSE);\r | |
1584 | \r | |
1585 | } else {\r | |
1586 | goto END_SESSION;\r | |
1587 | \r | |
1588 | }\r | |
1589 | \r | |
1590 | DhcpSb->IoStatus = EFI_TIMEOUT;\r | |
1591 | DhcpNotifyUser (DhcpSb, DHCP_NOTIFY_RENEWREBIND);\r | |
1592 | }\r | |
1593 | } else {\r | |
1594 | goto END_SESSION;\r | |
1595 | }\r | |
1596 | }\r | |
1597 | \r | |
1598 | //\r | |
1599 | // If an address has been acquired, check whether need to\r | |
1600 | // refresh or whether it has expired.\r | |
1601 | //\r | |
1602 | if (DHCP_CONNECTED (DhcpSb->DhcpState)) {\r | |
1603 | DhcpSb->LeaseLife++;\r | |
1604 | \r | |
1605 | //\r | |
1606 | // Don't timeout the lease, only count the life if user is\r | |
1607 | // requesting extra renew/rebind. Adjust the state after that.\r | |
1608 | //\r | |
1609 | if (DhcpSb->ExtraRefresh != 0) {\r | |
1610 | return ;\r | |
1611 | }\r | |
1612 | \r | |
1613 | if (DhcpSb->LeaseLife == DhcpSb->Lease) {\r | |
1614 | //\r | |
1615 | // Lease expires, end the session\r | |
1616 | //\r | |
1617 | goto END_SESSION;\r | |
1618 | \r | |
1619 | } else if (DhcpSb->LeaseLife == DhcpSb->T2) {\r | |
1620 | //\r | |
1621 | // T2 expires, transit to rebinding then send a REQUEST to any server\r | |
1622 | //\r | |
1623 | if (EFI_ERROR (DhcpSetState (DhcpSb, Dhcp4Rebinding, TRUE))) {\r | |
1624 | goto END_SESSION;\r | |
1625 | }\r | |
1626 | \r | |
1627 | if (Instance != NULL) {\r | |
1628 | Instance->ElaspedTime= 0;\r | |
1629 | } \r | |
1630 | \r | |
1631 | Status = DhcpSendMessage (\r | |
1632 | DhcpSb,\r | |
1633 | DhcpSb->Selected,\r | |
1634 | DhcpSb->Para,\r | |
1635 | DHCP_MSG_REQUEST,\r | |
1636 | NULL\r | |
1637 | );\r | |
1638 | \r | |
1639 | if (EFI_ERROR (Status)) {\r | |
1640 | goto END_SESSION;\r | |
1641 | }\r | |
1642 | \r | |
1643 | } else if (DhcpSb->LeaseLife == DhcpSb->T1) {\r | |
1644 | //\r | |
1645 | // T1 expires, transit to renewing, then send a REQUEST to the server\r | |
1646 | //\r | |
1647 | if (EFI_ERROR (DhcpSetState (DhcpSb, Dhcp4Renewing, TRUE))) {\r | |
1648 | goto END_SESSION;\r | |
1649 | }\r | |
1650 | \r | |
1651 | if (Instance != NULL) {\r | |
1652 | Instance->ElaspedTime= 0;\r | |
1653 | } \r | |
1654 | \r | |
1655 | Status = DhcpSendMessage (\r | |
1656 | DhcpSb,\r | |
1657 | DhcpSb->Selected,\r | |
1658 | DhcpSb->Para,\r | |
1659 | DHCP_MSG_REQUEST,\r | |
1660 | NULL\r | |
1661 | );\r | |
1662 | \r | |
1663 | if (EFI_ERROR (Status)) {\r | |
1664 | goto END_SESSION;\r | |
1665 | }\r | |
1666 | }\r | |
1667 | }\r | |
1668 | \r | |
1669 | ON_EXIT:\r | |
1670 | //\r | |
1671 | // Iterate through all the DhcpSb Children.\r | |
1672 | //\r | |
1673 | NET_LIST_FOR_EACH_SAFE (Entry, Next, &DhcpSb->Children) {\r | |
1674 | Instance = NET_LIST_USER_STRUCT (Entry, DHCP_PROTOCOL, Link);\r | |
1675 | \r | |
1676 | if ((Instance != NULL) && (Instance->Token != NULL)) {\r | |
1677 | Instance->Timeout--;\r | |
1678 | if (Instance->Timeout == 0) {\r | |
1679 | PxeDhcpDone (Instance);\r | |
1680 | }\r | |
1681 | }\r | |
1682 | }\r | |
1683 | \r | |
1684 | return ;\r | |
1685 | \r | |
1686 | END_SESSION:\r | |
1687 | DhcpEndSession (DhcpSb, EFI_TIMEOUT);\r | |
1688 | \r | |
1689 | return ;\r | |
1690 | }\r |