Dhcp6Utility.c@ 101283

Last change on this file since 101283 was 99404, checked in by vboxsync, 2 years ago
Devices/EFI/FirmwareNew: Update to edk2-stable202302 and make it build, bugref:4643
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1	/** @file
2	Dhcp6 support functions implementation.
3
4	(C) Copyright 2015 Hewlett-Packard Development Company, L.P.<BR>
5	Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
6
7	SPDX-License-Identifier: BSD-2-Clause-Patent
8
9	**/
10
11	#include "Dhcp6Impl.h"
12
13	/**
14	Generate client Duid in the format of Duid-llt.
15
16	@param[in] Mode The pointer to the mode of SNP.
17
18	@retval NULL If it failed to generate a client Id.
19	@retval others The pointer to the new client id.
20
21	**/
22	EFI_DHCP6_DUID *
23	Dhcp6GenerateClientId (
24	IN EFI_SIMPLE_NETWORK_MODE *Mode
25	)
26	{
27	EFI_STATUS Status;
28	EFI_DHCP6_DUID *Duid;
29	EFI_TIME Time;
30	UINT32 Stamp;
31	EFI_GUID Uuid;
32
33	//
34	// Attempt to get client Id from variable to keep it constant.
35	// See details in section-9 of rfc-3315.
36	//
37	GetVariable2 (L"ClientId", &gEfiDhcp6ServiceBindingProtocolGuid, (VOID **)&Duid, NULL);
38	if (Duid != NULL) {
39	return Duid;
40	}
41
42	//
43	// The format of client identifier option:
44	//
45	// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
46	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
47	// \| OPTION_CLIENTID \| option-len \|
48	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
49	// . .
50	// . DUID .
51	// . (variable length) .
52	// . .
53	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
54	//
55
56	//
57	// If System UUID is found from SMBIOS Table, use DUID-UUID type.
58	//
59	if ((PcdGet8 (PcdDhcp6UidType) == Dhcp6DuidTypeUuid) && !EFI_ERROR (NetLibGetSystemGuid (&Uuid)) && !CompareGuid (&Uuid, &gZeroGuid)) {
60	//
61	//
62	// The format of DUID-UUID:
63	//
64	// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
65	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
66	// \| DUID-Type (4) \| UUID (128 bits) \|
67	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ \|
68	// \| \|
69	// \| \|
70	// \| -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
71	// \| \|
72	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
73
74	//
75	// sizeof (option-len + Duid-type + UUID-size) = 20 bytes
76	//
77	Duid = AllocateZeroPool (2 + 2 + sizeof (EFI_GUID));
78	if (Duid == NULL) {
79	return NULL;
80	}
81
82	//
83	// sizeof (Duid-type + UUID-size) = 18 bytes
84	//
85	Duid->Length = (UINT16)(18);
86
87	//
88	// Set the Duid-type and copy UUID.
89	//
90	WriteUnaligned16 ((UINT16 *)(Duid->Duid), HTONS (Dhcp6DuidTypeUuid));
91
92	CopyMem (Duid->Duid + 2, &Uuid, sizeof (EFI_GUID));
93	} else {
94	//
95	//
96	// The format of DUID-LLT:
97	//
98	// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
99	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
100	// \| Duid type (1) \| hardware type (16 bits) \|
101	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
102	// \| time (32 bits) \|
103	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
104	// . .
105	// . link-layer address (variable length) .
106	// . .
107	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
108	//
109
110	//
111	// Generate a time stamp of the seconds from 2000/1/1, assume 30day/month.
112	//
113	gRT->GetTime (&Time, NULL);
114	Stamp = (UINT32)
115	(
116	((((UINT32)(Time.Year - 2000) * 360 + (Time.Month - 1) * 30 + (Time.Day - 1)) * 24 + Time.Hour) * 60 + Time.Minute) *
117	60 +
118	Time.Second
119	);
120
121	//
122	// sizeof (option-len + Duid-type + hardware-type + time) = 10 bytes
123	//
124	Duid = AllocateZeroPool (10 + Mode->HwAddressSize);
125	if (Duid == NULL) {
126	return NULL;
127	}
128
129	//
130	// sizeof (Duid-type + hardware-type + time) = 8 bytes
131	//
132	Duid->Length = (UINT16)(Mode->HwAddressSize + 8);
133
134	//
135	// Set the Duid-type, hardware-type, time and copy the hardware address.
136	//
137	WriteUnaligned16 ((UINT16 )((UINT8 )Duid + OFFSET_OF (EFI_DHCP6_DUID, Duid)), HTONS (Dhcp6DuidTypeLlt));
138	WriteUnaligned16 ((UINT16 )((UINT8 )Duid + OFFSET_OF (EFI_DHCP6_DUID, Duid) + 2), HTONS (NET_IFTYPE_ETHERNET));
139	WriteUnaligned32 ((UINT32 )((UINT8 )Duid + OFFSET_OF (EFI_DHCP6_DUID, Duid) + 4), HTONL (Stamp));
140
141	CopyMem (Duid->Duid + 8, &Mode->CurrentAddress, Mode->HwAddressSize);
142	}
143
144	Status = gRT->SetVariable (
145	L"ClientId",
146	&gEfiDhcp6ServiceBindingProtocolGuid,
147	(EFI_VARIABLE_NON_VOLATILE \| EFI_VARIABLE_BOOTSERVICE_ACCESS),
148	Duid->Length + 2,
149	(VOID *)Duid
150	);
151	if (EFI_ERROR (Status)) {
152	FreePool (Duid);
153	return NULL;
154	}
155
156	return Duid;
157	}
158
159	/**
160	Copy the Dhcp6 configure data.
161
162	@param[in] DstCfg The pointer to the destination configure data.
163	@param[in] SorCfg The pointer to the source configure data.
164
165	@retval EFI_SUCCESS Copy the content from SorCfg from DstCfg successfully.
166	@retval EFI_OUT_OF_RESOURCES Required system resources could not be allocated.
167
168	**/
169	EFI_STATUS
170	Dhcp6CopyConfigData (
171	IN EFI_DHCP6_CONFIG_DATA *DstCfg,
172	IN EFI_DHCP6_CONFIG_DATA *SorCfg
173	)
174	{
175	UINTN Index;
176	UINTN OptionListSize;
177	UINTN OptionSize;
178
179	CopyMem (DstCfg, SorCfg, sizeof (EFI_DHCP6_CONFIG_DATA));
180
181	//
182	// Allocate another buffer for solicitretransmission, and copy it.
183	//
184	if (SorCfg->SolicitRetransmission != NULL) {
185	DstCfg->SolicitRetransmission = AllocateZeroPool (sizeof (EFI_DHCP6_RETRANSMISSION));
186
187	if (DstCfg->SolicitRetransmission == NULL) {
188	//
189	// Error will be handled out of this function.
190	//
191	return EFI_OUT_OF_RESOURCES;
192	}
193
194	CopyMem (
195	DstCfg->SolicitRetransmission,
196	SorCfg->SolicitRetransmission,
197	sizeof (EFI_DHCP6_RETRANSMISSION)
198	);
199	}
200
201	if ((SorCfg->OptionList != NULL) && (SorCfg->OptionCount != 0)) {
202	OptionListSize = SorCfg->OptionCount * sizeof (EFI_DHCP6_PACKET_OPTION *);
203	DstCfg->OptionList = AllocateZeroPool (OptionListSize);
204
205	if (DstCfg->OptionList == NULL) {
206	//
207	// Error will be handled out of this function.
208	//
209	return EFI_OUT_OF_RESOURCES;
210	}
211
212	for (Index = 0; Index < SorCfg->OptionCount; Index++) {
213	OptionSize = NTOHS (SorCfg->OptionList[Index]->OpLen) + 4;
214	DstCfg->OptionList[Index] = AllocateZeroPool (OptionSize);
215
216	if (DstCfg->OptionList[Index] == NULL) {
217	//
218	// Error will be handled out of this function.
219	//
220	return EFI_OUT_OF_RESOURCES;
221	}
222
223	CopyMem (
224	DstCfg->OptionList[Index],
225	SorCfg->OptionList[Index],
226	OptionSize
227	);
228	}
229	}
230
231	return EFI_SUCCESS;
232	}
233
234	/**
235	Clean up the configure data.
236
237	@param[in, out] CfgData The pointer to the configure data.
238
239	**/
240	VOID
241	Dhcp6CleanupConfigData (
242	IN OUT EFI_DHCP6_CONFIG_DATA *CfgData
243	)
244	{
245	UINTN Index;
246
247	ASSERT (CfgData != NULL);
248	//
249	// Clean up all fields in config data including the reference buffers, but do
250	// not free the config data buffer itself.
251	//
252	if (CfgData->OptionList != NULL) {
253	for (Index = 0; Index < CfgData->OptionCount; Index++) {
254	if (CfgData->OptionList[Index] != NULL) {
255	FreePool (CfgData->OptionList[Index]);
256	}
257	}
258
259	FreePool (CfgData->OptionList);
260	}
261
262	if (CfgData->SolicitRetransmission != NULL) {
263	FreePool (CfgData->SolicitRetransmission);
264	}
265
266	ZeroMem (CfgData, sizeof (EFI_DHCP6_CONFIG_DATA));
267	}
268
269	/**
270	Clean up the mode data.
271
272	@param[in, out] ModeData The pointer to the mode data.
273
274	**/
275	VOID
276	Dhcp6CleanupModeData (
277	IN OUT EFI_DHCP6_MODE_DATA *ModeData
278	)
279	{
280	ASSERT (ModeData != NULL);
281	//
282	// Clean up all fields in mode data including the reference buffers, but do
283	// not free the mode data buffer itself.
284	//
285	if (ModeData->ClientId != NULL) {
286	FreePool (ModeData->ClientId);
287	}
288
289	if (ModeData->Ia != NULL) {
290	if (ModeData->Ia->ReplyPacket != NULL) {
291	FreePool (ModeData->Ia->ReplyPacket);
292	}
293
294	FreePool (ModeData->Ia);
295	}
296
297	ZeroMem (ModeData, sizeof (EFI_DHCP6_MODE_DATA));
298	}
299
300	/**
301	Calculate the expire time by the algorithm defined in rfc.
302
303	@param[in] Base The base value of the time.
304	@param[in] IsFirstRt If TRUE, it is the first time to calculate expire time.
305	@param[in] NeedSigned If TRUE, the signed factor is needed.
306
307	@return Expire The calculated result for the new expire time.
308
309	**/
310	UINT32
311	Dhcp6CalculateExpireTime (
312	IN UINT32 Base,
313	IN BOOLEAN IsFirstRt,
314	IN BOOLEAN NeedSigned
315	)
316	{
317	EFI_TIME Time;
318	BOOLEAN Signed;
319	UINT32 Seed;
320	UINT32 Expire;
321
322	//
323	// Take the 10bits of microsecond in system time as a uniform distribution.
324	// Take the 10th bit as a flag to determine it's signed or not.
325	//
326	gRT->GetTime (&Time, NULL);
327	Seed = ((Time.Nanosecond >> 10) & DHCP6_10_BIT_MASK);
328	Signed = (BOOLEAN)((((Time.Nanosecond >> 9) & 0x01) != 0) ? TRUE : FALSE);
329	Signed = (BOOLEAN)(NeedSigned ? Signed : FALSE);
330
331	//
332	// Calculate expire by the following algo:
333	// 1. base + base * (-0.1 ~ 0) for the first solicit
334	// 2. base + base * (-0.1 ~ 0.1) for the first other messages
335	// 3. 2 * base + base * (-0.1 ~ 0.1) for the subsequent all messages
336	// 4. base + base * (-0.1 ~ 0) for the more than mrt timeout
337	//
338	// The (Seed / 0x3ff / 10) is used to a random range (0, 0.1).
339	//
340	if (IsFirstRt && Signed) {
341	Expire = Base - (UINT32)(Base * Seed / DHCP6_10_BIT_MASK / 10);
342	} else if (IsFirstRt && !Signed) {
343	Expire = Base + (UINT32)(Base * Seed / DHCP6_10_BIT_MASK / 10);
344	} else if (!IsFirstRt && Signed) {
345	Expire = 2 * Base - (UINT32)(Base * Seed / DHCP6_10_BIT_MASK / 10);
346	} else {
347	Expire = 2 * Base + (UINT32)(Base * Seed / DHCP6_10_BIT_MASK / 10);
348	}
349
350	Expire = (Expire != 0) ? Expire : 1;
351
352	return Expire;
353	}
354
355	/**
356	Calculate the lease time by the algorithm defined in rfc.
357
358	@param[in] IaCb The pointer to the Ia control block.
359
360	**/
361	VOID
362	Dhcp6CalculateLeaseTime (
363	IN DHCP6_IA_CB *IaCb
364	)
365	{
366	UINT32 MinLt;
367	UINT32 MaxLt;
368	UINTN Index;
369
370	ASSERT (IaCb->Ia->IaAddressCount > 0);
371
372	MinLt = (UINT32)(-1);
373	MaxLt = 0;
374
375	//
376	// Calculate minlt as min of all valid life time, and maxlt as max of all
377	// valid life time.
378	//
379	for (Index = 0; Index < IaCb->Ia->IaAddressCount; Index++) {
380	MinLt = MIN (MinLt, IaCb->Ia->IaAddress[Index].ValidLifetime);
381	MaxLt = MAX (MinLt, IaCb->Ia->IaAddress[Index].ValidLifetime);
382	}
383
384	//
385	// Take 50% minlt as t1, and 80% maxlt as t2 if Dhcp6 server doesn't offer
386	// such information.
387	//
388	IaCb->T1 = (IaCb->T1 != 0) ? IaCb->T1 : (UINT32)(MinLt * 5 / 10);
389	IaCb->T2 = (IaCb->T2 != 0) ? IaCb->T2 : (UINT32)(MinLt * 8 / 10);
390	IaCb->AllExpireTime = MaxLt;
391	IaCb->LeaseTime = 0;
392	}
393
394	/**
395	Check whether the addresses are all included by the configured Ia.
396
397	@param[in] Ia The pointer to the Ia.
398	@param[in] AddressCount The number of addresses.
399	@param[in] Addresses The pointer to the addresses buffer.
400
401	@retval EFI_SUCCESS The addresses are all included by the configured IA.
402	@retval EFI_NOT_FOUND The addresses are not included by the configured IA.
403
404	**/
405	EFI_STATUS
406	Dhcp6CheckAddress (
407	IN EFI_DHCP6_IA *Ia,
408	IN UINT32 AddressCount,
409	IN EFI_IPv6_ADDRESS *Addresses
410	)
411	{
412	UINTN Index1;
413	UINTN Index2;
414	BOOLEAN Found;
415
416	//
417	// Check whether the addresses are all included by the configured IA. And it
418	// will return success if address count is zero, which means all addresses.
419	//
420	for (Index1 = 0; Index1 < AddressCount; Index1++) {
421	Found = FALSE;
422
423	for (Index2 = 0; Index2 < Ia->IaAddressCount; Index2++) {
424	if (CompareMem (
425	&Addresses[Index1],
426	&Ia->IaAddress[Index2],
427	sizeof (EFI_IPv6_ADDRESS)
428	) == 0)
429	{
430	Found = TRUE;
431	break;
432	}
433	}
434
435	if (!Found) {
436	return EFI_NOT_FOUND;
437	}
438	}
439
440	return EFI_SUCCESS;
441	}
442
443	/**
444	Deprive the addresses from current Ia, and generate another eliminated Ia.
445
446	@param[in] Ia The pointer to the Ia.
447	@param[in] AddressCount The number of addresses.
448	@param[in] Addresses The pointer to the addresses buffer.
449
450	@retval NULL If it failed to generate the deprived Ia.
451	@retval others The pointer to the deprived Ia.
452
453	**/
454	EFI_DHCP6_IA *
455	Dhcp6DepriveAddress (
456	IN EFI_DHCP6_IA *Ia,
457	IN UINT32 AddressCount,
458	IN EFI_IPv6_ADDRESS *Addresses
459	)
460	{
461	EFI_DHCP6_IA *IaCopy;
462	UINTN IaCopySize;
463	UINTN Index1;
464	UINTN Index2;
465	BOOLEAN Found;
466
467	if (AddressCount == 0) {
468	//
469	// It means release all Ia addresses if address count is zero.
470	//
471	AddressCount = Ia->IaAddressCount;
472	}
473
474	ASSERT (AddressCount != 0);
475
476	IaCopySize = sizeof (EFI_DHCP6_IA) + (AddressCount - 1) * sizeof (EFI_DHCP6_IA_ADDRESS);
477	IaCopy = AllocateZeroPool (IaCopySize);
478
479	if (IaCopy == NULL) {
480	return NULL;
481	}
482
483	if (AddressCount == Ia->IaAddressCount) {
484	//
485	// If release all Ia addresses, just copy the configured Ia and then set
486	// its address count as zero.
487	// We may decline/release part of addresses at the beginning. So it's a
488	// forwarding step to update address infor for decline/release, while the
489	// other infor such as Ia state will be updated when receiving reply.
490	//
491	CopyMem (IaCopy, Ia, IaCopySize);
492	Ia->IaAddressCount = 0;
493	return IaCopy;
494	}
495
496	CopyMem (IaCopy, Ia, sizeof (EFI_DHCP6_IA));
497
498	//
499	// Move the addresses from the Ia of instance to the deprived Ia.
500	//
501	for (Index1 = 0; Index1 < AddressCount; Index1++) {
502	Found = FALSE;
503
504	for (Index2 = 0; Index2 < Ia->IaAddressCount; Index2++) {
505	if (CompareMem (
506	&Addresses[Index1],
507	&Ia->IaAddress[Index2],
508	sizeof (EFI_IPv6_ADDRESS)
509	) == 0)
510	{
511	//
512	// Copy the deprived address to the copy of Ia
513	//
514	CopyMem (
515	&IaCopy->IaAddress[Index1],
516	&Ia->IaAddress[Index2],
517	sizeof (EFI_DHCP6_IA_ADDRESS)
518	);
519	//
520	// Delete the deprived address from the instance Ia
521	//
522	if (Index2 + 1 < Ia->IaAddressCount) {
523	CopyMem (
524	&Ia->IaAddress[Index2],
525	&Ia->IaAddress[Index2 + 1],
526	(Ia->IaAddressCount - Index2 - 1) * sizeof (EFI_DHCP6_IA_ADDRESS)
527	);
528	}
529
530	Found = TRUE;
531	break;
532	}
533	}
534
535	ASSERT (Found == TRUE);
536	}
537
538	Ia->IaAddressCount -= AddressCount;
539	IaCopy->IaAddressCount = AddressCount;
540
541	return IaCopy;
542	}
543
544	/**
545	The dummy ext buffer free callback routine.
546
547	@param[in] Arg The pointer to the parameter.
548
549	**/
550	VOID
551	EFIAPI
552	Dhcp6DummyExtFree (
553	IN VOID *Arg
554	)
555	{
556	}
557
558	/**
559	The callback routine once message transmitted.
560
561	@param[in] Wrap The pointer to the received net buffer.
562	@param[in] EndPoint The pointer to the udp end point.
563	@param[in] IoStatus The return status from udp io.
564	@param[in] Context The opaque parameter to the function.
565
566	**/
567	VOID
568	EFIAPI
569	Dhcp6OnTransmitted (
570	IN NET_BUF *Wrap,
571	IN UDP_END_POINT *EndPoint,
572	IN EFI_STATUS IoStatus,
573	IN VOID *Context
574	)
575	{
576	NetbufFree (Wrap);
577	}
578
579	/**
580	Append the option to Buf, and move Buf to the end.
581
582	@param[in, out] Buf The pointer to the buffer.
583	@param[in] OptType The option type.
584	@param[in] OptLen The length of option contents.
585	@param[in] Data The pointer to the option content.
586
587	@return Buf The position to append the next option.
588
589	**/
590	UINT8 *
591	Dhcp6AppendOption (
592	IN OUT UINT8 *Buf,
593	IN UINT16 OptType,
594	IN UINT16 OptLen,
595	IN UINT8 *Data
596	)
597	{
598	//
599	// The format of Dhcp6 option:
600	//
601	// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
602	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
603	// \| option-code \| option-len (option data) \|
604	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
605	// \| option-data \|
606	// \| (option-len octets) \|
607	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
608	//
609
610	ASSERT (OptLen != 0);
611
612	WriteUnaligned16 ((UINT16 *)Buf, OptType);
613	Buf += 2;
614	WriteUnaligned16 ((UINT16 *)Buf, OptLen);
615	Buf += 2;
616	CopyMem (Buf, Data, NTOHS (OptLen));
617	Buf += NTOHS (OptLen);
618
619	return Buf;
620	}
621
622	/**
623	Append the appointed IA Address option to Buf, and move Buf to the end.
624
625	@param[in, out] Buf The pointer to the position to append.
626	@param[in] IaAddr The pointer to the IA Address.
627	@param[in] MessageType Message type of DHCP6 package.
628
629	@return Buf The position to append the next option.
630
631	**/
632	UINT8 *
633	Dhcp6AppendIaAddrOption (
634	IN OUT UINT8 *Buf,
635	IN EFI_DHCP6_IA_ADDRESS *IaAddr,
636	IN UINT32 MessageType
637	)
638	{
639	// The format of the IA Address option is:
640	//
641	// 0 1 2 3
642	// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
643	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
644	// \| OPTION_IAADDR \| option-len \|
645	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
646	// \| \|
647	// \| IPv6 address \|
648	// \| \|
649	// \| \|
650	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
651	// \| preferred-lifetime \|
652	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
653	// \| valid-lifetime \|
654	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
655	// . .
656	// . IAaddr-options .
657	// . .
658	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
659
660	//
661	// Fill the value of Ia Address option type
662	//
663	WriteUnaligned16 ((UINT16 *)Buf, HTONS (Dhcp6OptIaAddr));
664	Buf += 2;
665
666	WriteUnaligned16 ((UINT16 *)Buf, HTONS (sizeof (EFI_DHCP6_IA_ADDRESS)));
667	Buf += 2;
668
669	CopyMem (Buf, &IaAddr->IpAddress, sizeof (EFI_IPv6_ADDRESS));
670	Buf += sizeof (EFI_IPv6_ADDRESS);
671
672	//
673	// Fill the value of preferred-lifetime and valid-lifetime.
674	// According to RFC3315 Chapter 18.1.2, the preferred-lifetime and valid-lifetime fields
675	// should set to 0 when initiate a Confirm message.
676	//
677	if (MessageType != Dhcp6MsgConfirm) {
678	WriteUnaligned32 ((UINT32 *)Buf, HTONL (IaAddr->PreferredLifetime));
679	}
680
681	Buf += 4;
682
683	if (MessageType != Dhcp6MsgConfirm) {
684	WriteUnaligned32 ((UINT32 *)Buf, HTONL (IaAddr->ValidLifetime));
685	}
686
687	Buf += 4;
688
689	return Buf;
690	}
691
692	/**
693	Append the appointed Ia option to Buf, and move Buf to the end.
694
695	@param[in, out] Buf The pointer to the position to append.
696	@param[in] Ia The pointer to the Ia.
697	@param[in] T1 The time of T1.
698	@param[in] T2 The time of T2.
699	@param[in] MessageType Message type of DHCP6 package.
700
701	@return Buf The position to append the next Ia option.
702
703	**/
704	UINT8 *
705	Dhcp6AppendIaOption (
706	IN OUT UINT8 *Buf,
707	IN EFI_DHCP6_IA *Ia,
708	IN UINT32 T1,
709	IN UINT32 T2,
710	IN UINT32 MessageType
711	)
712	{
713	UINT8 *AddrOpt;
714	UINT16 *Len;
715	UINTN Index;
716
717	//
718	// The format of IA_NA and IA_TA option:
719	//
720	// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
721	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
722	// \| OPTION_IA_NA \| option-len \|
723	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
724	// \| IAID (4 octets) \|
725	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
726	// \| T1 (only for IA_NA) \|
727	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
728	// \| T2 (only for IA_NA) \|
729	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
730	// \| \|
731	// . IA_NA-options/IA_TA-options .
732	// . .
733	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
734	//
735
736	//
737	// Fill the value of Ia option type
738	//
739	WriteUnaligned16 ((UINT16 *)Buf, HTONS (Ia->Descriptor.Type));
740	Buf += 2;
741
742	//
743	// Fill the len of Ia option later, keep the pointer first
744	//
745	Len = (UINT16 *)Buf;
746	Buf += 2;
747
748	//
749	// Fill the value of iaid
750	//
751	WriteUnaligned32 ((UINT32 *)Buf, HTONL (Ia->Descriptor.IaId));
752	Buf += 4;
753
754	//
755	// Fill the value of t1 and t2 if iana, keep it 0xffffffff if no specified.
756	//
757	if (Ia->Descriptor.Type == Dhcp6OptIana) {
758	WriteUnaligned32 ((UINT32 *)Buf, HTONL ((T1 != 0) ? T1 : 0xffffffff));
759	Buf += 4;
760	WriteUnaligned32 ((UINT32 *)Buf, HTONL ((T2 != 0) ? T2 : 0xffffffff));
761	Buf += 4;
762	}
763
764	//
765	// Fill all the addresses belong to the Ia
766	//
767	for (Index = 0; Index < Ia->IaAddressCount; Index++) {
768	AddrOpt = (UINT8 )Ia->IaAddress + Index sizeof (EFI_DHCP6_IA_ADDRESS);
769	Buf = Dhcp6AppendIaAddrOption (Buf, (EFI_DHCP6_IA_ADDRESS *)AddrOpt, MessageType);
770	}
771
772	//
773	// Fill the value of Ia option length
774	//
775	Len = HTONS ((UINT16)(Buf - (UINT8 )Len - 2));
776
777	return Buf;
778	}
779
780	/**
781	Append the appointed Elapsed time option to Buf, and move Buf to the end.
782
783	@param[in, out] Buf The pointer to the position to append.
784	@param[in] Instance The pointer to the Dhcp6 instance.
785	@param[out] Elapsed The pointer to the elapsed time value in
786	the generated packet.
787
788	@return Buf The position to append the next Ia option.
789
790	**/
791	UINT8 *
792	Dhcp6AppendETOption (
793	IN OUT UINT8 *Buf,
794	IN DHCP6_INSTANCE *Instance,
795	OUT UINT16 **Elapsed
796	)
797	{
798	//
799	// The format of elapsed time option:
800	//
801	// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
802	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
803	// \| OPTION_ELAPSED_TIME \| option-len \|
804	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
805	// \| elapsed-time \|
806	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
807	//
808
809	//
810	// Fill the value of elapsed-time option type.
811	//
812	WriteUnaligned16 ((UINT16 *)Buf, HTONS (Dhcp6OptElapsedTime));
813	Buf += 2;
814
815	//
816	// Fill the len of elapsed-time option, which is fixed.
817	//
818	WriteUnaligned16 ((UINT16 *)Buf, HTONS (2));
819	Buf += 2;
820
821	//
822	// Fill in elapsed time value with 0 value for now. The actual value is
823	// filled in later just before the packet is transmitted.
824	//
825	WriteUnaligned16 ((UINT16 *)Buf, HTONS (0));
826	Elapsed = (UINT16 )Buf;
827	Buf += 2;
828
829	return Buf;
830	}
831
832	/**
833	Set the elapsed time based on the given instance and the pointer to the
834	elapsed time option.
835
836	@param[in] Elapsed The pointer to the position to append.
837	@param[in] Instance The pointer to the Dhcp6 instance.
838
839	**/
840	VOID
841	SetElapsedTime (
842	IN UINT16 *Elapsed,
843	IN DHCP6_INSTANCE *Instance
844	)
845	{
846	EFI_TIME Time;
847	UINT64 CurrentStamp;
848	UINT64 ElapsedTimeValue;
849
850	//
851	// Generate a time stamp of the centiseconds from 2000/1/1, assume 30day/month.
852	//
853	gRT->GetTime (&Time, NULL);
854	CurrentStamp = MultU64x32 (
855	((((UINT32)(Time.Year - 2000) * 360 + (Time.Month - 1) * 30 + (Time.Day - 1)) * 24 + Time.Hour) * 60 + Time.Minute) * 60 + Time.Second,
856	100
857	) +
858	DivU64x32 (
859	Time.Nanosecond,
860	10000000
861	);
862
863	//
864	// Sentinel value of 0 means that this is the first DHCP packet that we are
865	// sending and that we need to initialize the value. First DHCP message
866	// gets 0 elapsed-time. Otherwise, calculate based on StartTime.
867	//
868	if (Instance->StartTime == 0) {
869	ElapsedTimeValue = 0;
870	Instance->StartTime = CurrentStamp;
871	} else {
872	ElapsedTimeValue = CurrentStamp - Instance->StartTime;
873
874	//
875	// If elapsed time cannot fit in two bytes, set it to 0xffff.
876	//
877	if (ElapsedTimeValue > 0xffff) {
878	ElapsedTimeValue = 0xffff;
879	}
880	}
881
882	WriteUnaligned16 (Elapsed, HTONS ((UINT16)ElapsedTimeValue));
883	}
884
885	/**
886	Seek the address of the first byte of the option header.
887
888	@param[in] Buf The pointer to the buffer.
889	@param[in] SeekLen The length to seek.
890	@param[in] OptType The option type.
891
892	@retval NULL If it failed to seek the option.
893	@retval others The position to the option.
894
895	**/
896	UINT8 *
897	Dhcp6SeekOption (
898	IN UINT8 *Buf,
899	IN UINT32 SeekLen,
900	IN UINT16 OptType
901	)
902	{
903	UINT8 *Cursor;
904	UINT8 *Option;
905	UINT16 DataLen;
906	UINT16 OpCode;
907
908	Option = NULL;
909	Cursor = Buf;
910
911	//
912	// The format of Dhcp6 option refers to Dhcp6AppendOption().
913	//
914	while (Cursor < Buf + SeekLen) {
915	OpCode = ReadUnaligned16 ((UINT16 *)Cursor);
916	if (OpCode == HTONS (OptType)) {
917	Option = Cursor;
918	break;
919	}
920
921	DataLen = NTOHS (ReadUnaligned16 ((UINT16 *)(Cursor + 2)));
922	Cursor += (DataLen + 4);
923	}
924
925	return Option;
926	}
927
928	/**
929	Seek the address of the first byte of the Ia option header.
930
931	@param[in] Buf The pointer to the buffer.
932	@param[in] SeekLen The length to seek.
933	@param[in] IaDesc The pointer to the Ia descriptor.
934
935	@retval NULL If it failed to seek the Ia option.
936	@retval others The position to the Ia option.
937
938	**/
939	UINT8 *
940	Dhcp6SeekIaOption (
941	IN UINT8 *Buf,
942	IN UINT32 SeekLen,
943	IN EFI_DHCP6_IA_DESCRIPTOR *IaDesc
944	)
945	{
946	UINT8 *Cursor;
947	UINT8 *Option;
948	UINT16 DataLen;
949	UINT16 OpCode;
950	UINT32 IaId;
951
952	//
953	// The format of IA_NA and IA_TA option refers to Dhcp6AppendIaOption().
954	//
955	Option = NULL;
956	Cursor = Buf;
957
958	while (Cursor < Buf + SeekLen) {
959	OpCode = ReadUnaligned16 ((UINT16 *)Cursor);
960	IaId = ReadUnaligned32 ((UINT32 *)(Cursor + 4));
961	if ((OpCode == HTONS (IaDesc->Type)) && (IaId == HTONL (IaDesc->IaId))) {
962	Option = Cursor;
963	break;
964	}
965
966	DataLen = NTOHS (ReadUnaligned16 ((UINT16 *)(Cursor + 2)));
967	Cursor += (DataLen + 4);
968	}
969
970	return Option;
971	}
972
973	/**
974	Check whether the incoming IPv6 address in IaAddr is one of the maintained
975	addresses in the IA control block.
976
977	@param[in] IaAddr The pointer to the IA Address to be checked.
978	@param[in] CurrentIa The pointer to the IA in IA control block.
979
980	@retval TRUE Yes, this Address is already in IA control block.
981	@retval FALSE No, this Address is NOT in IA control block.
982
983	**/
984	BOOLEAN
985	Dhcp6AddrIsInCurrentIa (
986	IN EFI_DHCP6_IA_ADDRESS *IaAddr,
987	IN EFI_DHCP6_IA *CurrentIa
988	)
989	{
990	UINT32 Index;
991
992	ASSERT (IaAddr != NULL && CurrentIa != NULL);
993
994	for (Index = 0; Index < CurrentIa->IaAddressCount; Index++) {
995	if (EFI_IP6_EQUAL (&IaAddr->IpAddress, &CurrentIa->IaAddress[Index].IpAddress)) {
996	return TRUE;
997	}
998	}
999
1000	return FALSE;
1001	}
1002
1003	/**
1004	Parse the address option and update the address information.
1005
1006	@param[in] CurrentIa The pointer to the Ia Address in control block.
1007	@param[in] IaInnerOpt The pointer to the buffer.
1008	@param[in] IaInnerLen The length to parse.
1009	@param[out] AddrNum The number of addresses.
1010	@param[in, out] AddrBuf The pointer to the address buffer.
1011
1012	**/
1013	VOID
1014	Dhcp6ParseAddrOption (
1015	IN EFI_DHCP6_IA *CurrentIa,
1016	IN UINT8 *IaInnerOpt,
1017	IN UINT16 IaInnerLen,
1018	OUT UINT32 *AddrNum,
1019	IN OUT EFI_DHCP6_IA_ADDRESS *AddrBuf
1020	)
1021	{
1022	UINT8 *Cursor;
1023	UINT16 DataLen;
1024	UINT16 OpCode;
1025	UINT32 ValidLt;
1026	UINT32 PreferredLt;
1027	EFI_DHCP6_IA_ADDRESS *IaAddr;
1028
1029	//
1030	// The format of the IA Address option:
1031	//
1032	// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
1033	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1034	// \| OPTION_IAADDR \| option-len \|
1035	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1036	// \| \|
1037	// \| IPv6 address \|
1038	// \| \|
1039	// \| \|
1040	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1041	// \| preferred-lifetime \|
1042	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1043	// \| valid-lifetime \|
1044	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1045	// . .
1046	// . IAaddr-options .
1047	// . .
1048	// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1049	//
1050
1051	//
1052	// Two usage model:
1053	//
1054	// 1. Pass addrbuf == null, to get the addrnum over the Ia inner options.
1055	// 2. Pass addrbuf != null, to resolve the addresses over the Ia inner
1056	// options to the addrbuf.
1057	//
1058
1059	Cursor = IaInnerOpt;
1060	*AddrNum = 0;
1061
1062	while (Cursor < IaInnerOpt + IaInnerLen) {
1063	//
1064	// Refer to RFC3315 Chapter 18.1.8, we need to update lifetimes for any addresses in the IA option
1065	// that the client already has recorded in the IA, and discard the Ia address option with 0 valid time.
1066	//
1067	OpCode = ReadUnaligned16 ((UINT16 *)Cursor);
1068	PreferredLt = NTOHL (ReadUnaligned32 ((UINT32 *)(Cursor + 20)));
1069	ValidLt = NTOHL (ReadUnaligned32 ((UINT32 *)(Cursor + 24)));
1070	IaAddr = (EFI_DHCP6_IA_ADDRESS *)(Cursor + 4);
1071	if ((OpCode == HTONS (Dhcp6OptIaAddr)) && (ValidLt >= PreferredLt) &&
1072	(Dhcp6AddrIsInCurrentIa (IaAddr, CurrentIa) \|\| (ValidLt != 0)))
1073	{
1074	if (AddrBuf != NULL) {
1075	CopyMem (AddrBuf, IaAddr, sizeof (EFI_DHCP6_IA_ADDRESS));
1076	AddrBuf->PreferredLifetime = PreferredLt;
1077	AddrBuf->ValidLifetime = ValidLt;
1078	AddrBuf = (EFI_DHCP6_IA_ADDRESS )((UINT8 )AddrBuf + sizeof (EFI_DHCP6_IA_ADDRESS));
1079	}
1080
1081	(*AddrNum)++;
1082	}
1083
1084	DataLen = NTOHS (ReadUnaligned16 ((UINT16 *)(Cursor + 2)));
1085	Cursor += (DataLen + 4);
1086	}
1087	}
1088
1089	/**
1090	Create a control block for the Ia according to the corresponding options.
1091
1092	@param[in] Instance The pointer to DHCP6 Instance.
1093	@param[in] IaInnerOpt The pointer to the inner options in the Ia option.
1094	@param[in] IaInnerLen The length of all the inner options in the Ia option.
1095	@param[in] T1 T1 time in the Ia option.
1096	@param[in] T2 T2 time in the Ia option.
1097
1098	@retval EFI_NOT_FOUND No valid IA option is found.
1099	@retval EFI_SUCCESS Create an IA control block successfully.
1100	@retval EFI_OUT_OF_RESOURCES Required system resources could not be allocated.
1101	@retval EFI_DEVICE_ERROR An unexpected error.
1102
1103	**/
1104	EFI_STATUS
1105	Dhcp6GenerateIaCb (
1106	IN DHCP6_INSTANCE *Instance,
1107	IN UINT8 *IaInnerOpt,
1108	IN UINT16 IaInnerLen,
1109	IN UINT32 T1,
1110	IN UINT32 T2
1111	)
1112	{
1113	UINT32 AddrNum;
1114	UINT32 IaSize;
1115	EFI_DHCP6_IA *Ia;
1116
1117	if (Instance->IaCb.Ia == NULL) {
1118	return EFI_DEVICE_ERROR;
1119	}
1120
1121	//
1122	// Calculate the number of addresses for this Ia, excluding the addresses with
1123	// the value 0 of valid lifetime.
1124	//
1125	Dhcp6ParseAddrOption (Instance->IaCb.Ia, IaInnerOpt, IaInnerLen, &AddrNum, NULL);
1126
1127	if (AddrNum == 0) {
1128	return EFI_NOT_FOUND;
1129	}
1130
1131	//
1132	// Allocate for new IA.
1133	//
1134	IaSize = sizeof (EFI_DHCP6_IA) + (AddrNum - 1) * sizeof (EFI_DHCP6_IA_ADDRESS);
1135	Ia = AllocateZeroPool (IaSize);
1136
1137	if (Ia == NULL) {
1138	return EFI_OUT_OF_RESOURCES;
1139	}
1140
1141	//
1142	// Fill up this new IA fields.
1143	//
1144	Ia->State = Instance->IaCb.Ia->State;
1145	Ia->IaAddressCount = AddrNum;
1146	CopyMem (&Ia->Descriptor, &Instance->Config->IaDescriptor, sizeof (EFI_DHCP6_IA_DESCRIPTOR));
1147	Dhcp6ParseAddrOption (Instance->IaCb.Ia, IaInnerOpt, IaInnerLen, &AddrNum, Ia->IaAddress);
1148
1149	//
1150	// Free original IA resource.
1151	//
1152	if (Instance->IaCb.Ia->ReplyPacket != NULL) {
1153	FreePool (Instance->IaCb.Ia->ReplyPacket);
1154	}
1155
1156	FreePool (Instance->IaCb.Ia);
1157
1158	ZeroMem (&Instance->IaCb, sizeof (DHCP6_IA_CB));
1159
1160	//
1161	// Update IaCb to use new IA.
1162	//
1163	Instance->IaCb.Ia = Ia;
1164
1165	//
1166
1167	// Fill in IaCb fields. Such as T1, T2, AllExpireTime and LeaseTime.
1168	//
1169	Instance->IaCb.T1 = T1;
1170	Instance->IaCb.T2 = T2;
1171	Dhcp6CalculateLeaseTime (&Instance->IaCb);
1172
1173	return EFI_SUCCESS;
1174	}
1175
1176	/**
1177	Cache the current IA configuration information.
1178
1179	@param[in] Instance The pointer to DHCP6 Instance.
1180
1181	@retval EFI_SUCCESS Cache the current IA successfully.
1182	@retval EFI_OUT_OF_RESOURCES Required system resources could not be allocated.
1183
1184	**/
1185	EFI_STATUS
1186	Dhcp6CacheIa (
1187	IN DHCP6_INSTANCE *Instance
1188	)
1189	{
1190	UINTN IaSize;
1191	EFI_DHCP6_IA *Ia;
1192
1193	Ia = Instance->IaCb.Ia;
1194
1195	if ((Instance->CacheIa == NULL) && (Ia != NULL)) {
1196	//
1197	// Cache the current IA.
1198	//
1199	IaSize = sizeof (EFI_DHCP6_IA) + (Ia->IaAddressCount - 1) * sizeof (EFI_DHCP6_IA_ADDRESS);
1200
1201	Instance->CacheIa = AllocateZeroPool (IaSize);
1202	if (Instance->CacheIa == NULL) {
1203	return EFI_OUT_OF_RESOURCES;
1204	}
1205
1206	CopyMem (Instance->CacheIa, Ia, IaSize);
1207	}
1208
1209	return EFI_SUCCESS;
1210	}
1211
1212	/**
1213	Append CacheIa to the current IA. Meanwhile, clear CacheIa.ValidLifetime to 0.
1214
1215	@param[in] Instance The pointer to DHCP6 instance.
1216
1217	**/
1218	VOID
1219	Dhcp6AppendCacheIa (
1220	IN DHCP6_INSTANCE *Instance
1221	)
1222	{
1223	UINT8 *Ptr;
1224	UINTN Index;
1225	UINTN IaSize;
1226	UINTN NewIaSize;
1227	EFI_DHCP6_IA *Ia;
1228	EFI_DHCP6_IA *NewIa;
1229	EFI_DHCP6_IA *CacheIa;
1230
1231	Ia = Instance->IaCb.Ia;
1232	CacheIa = Instance->CacheIa;
1233
1234	if ((CacheIa != NULL) && (CacheIa->IaAddressCount != 0)) {
1235	//
1236	// There are old addresses existing. Merge with current addresses.
1237	//
1238	NewIaSize = sizeof (EFI_DHCP6_IA) + (Ia->IaAddressCount + CacheIa->IaAddressCount - 1) * sizeof (EFI_DHCP6_IA_ADDRESS);
1239	NewIa = AllocateZeroPool (NewIaSize);
1240	if (NewIa == NULL) {
1241	return;
1242	}
1243
1244	IaSize = sizeof (EFI_DHCP6_IA) + (Ia->IaAddressCount - 1) * sizeof (EFI_DHCP6_IA_ADDRESS);
1245	CopyMem (NewIa, Ia, IaSize);
1246
1247	//
1248	// Clear old address.ValidLifetime
1249	//
1250	for (Index = 0; Index < CacheIa->IaAddressCount; Index++) {
1251	CacheIa->IaAddress[Index].ValidLifetime = 0;
1252	}
1253
1254	NewIa->IaAddressCount += CacheIa->IaAddressCount;
1255	Ptr = (UINT8 *)&NewIa->IaAddress[Ia->IaAddressCount];
1256	CopyMem (Ptr, CacheIa->IaAddress, CacheIa->IaAddressCount * sizeof (EFI_DHCP6_IA_ADDRESS));
1257
1258	//
1259	// Migrate to the NewIa and free previous.
1260	//
1261	FreePool (Instance->CacheIa);
1262	FreePool (Instance->IaCb.Ia);
1263	Instance->CacheIa = NULL;
1264	Instance->IaCb.Ia = NewIa;
1265	}
1266	}
1267
1268	/**
1269	Calculate the Dhcp6 get mapping timeout by adding additional delay to the IP6 DAD transmits count.
1270
1271	@param[in] Ip6Cfg The pointer to Ip6 config protocol.
1272	@param[out] TimeOut The time out value in 100ns units.
1273
1274	@retval EFI_INVALID_PARAMETER Input parameters are invalid.
1275	@retval EFI_SUCCESS Calculate the time out value successfully.
1276	**/
1277	EFI_STATUS
1278	Dhcp6GetMappingTimeOut (
1279	IN EFI_IP6_CONFIG_PROTOCOL *Ip6Cfg,
1280	OUT UINTN *TimeOut
1281	)
1282	{
1283	EFI_STATUS Status;
1284	UINTN DataSize;
1285	EFI_IP6_CONFIG_DUP_ADDR_DETECT_TRANSMITS DadXmits;
1286
1287	if ((Ip6Cfg == NULL) \|\| (TimeOut == NULL)) {
1288	return EFI_INVALID_PARAMETER;
1289	}
1290
1291	DataSize = sizeof (EFI_IP6_CONFIG_DUP_ADDR_DETECT_TRANSMITS);
1292	Status = Ip6Cfg->GetData (
1293	Ip6Cfg,
1294	Ip6ConfigDataTypeDupAddrDetectTransmits,
1295	&DataSize,
1296	&DadXmits
1297	);
1298	if (EFI_ERROR (Status)) {
1299	return Status;
1300	}
1301
1302	TimeOut = TICKS_PER_SECOND DadXmits.DupAddrDetectTransmits + DHCP6_DAD_ADDITIONAL_DELAY;
1303
1304	return EFI_SUCCESS;
1305	}

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source: vbox/trunk/src/VBox/Devices/EFI/FirmwareNew/NetworkPkg/Dhcp6Dxe/Dhcp6Utility.c@ 101283

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