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- /** @file
- Dhcp6 support functions implementation.
- (C) Copyright 2015 Hewlett-Packard Development Company, L.P.<BR>
- Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
- SPDX-License-Identifier: BSD-2-Clause-Patent
- **/
- #include "Dhcp6Impl.h"
- /**
- Generate client Duid in the format of Duid-llt.
- @param[in] Mode The pointer to the mode of SNP.
- @retval NULL If it failed to generate a client Id.
- @retval others The pointer to the new client id.
- **/
- EFI_DHCP6_DUID *
- Dhcp6GenerateClientId (
- IN EFI_SIMPLE_NETWORK_MODE *Mode
- )
- {
- EFI_STATUS Status;
- EFI_DHCP6_DUID *Duid;
- EFI_TIME Time;
- UINT32 Stamp;
- EFI_GUID Uuid;
- //
- // Attempt to get client Id from variable to keep it constant.
- // See details in section-9 of rfc-3315.
- //
- GetVariable2 (L"ClientId", &gEfiDhcp6ServiceBindingProtocolGuid, (VOID **)&Duid, NULL);
- if (Duid != NULL) {
- return Duid;
- }
- //
- // The format of client identifier option:
- //
- // 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
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- // | OPTION_CLIENTID | option-len |
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- // . .
- // . DUID .
- // . (variable length) .
- // . .
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- //
- //
- // If System UUID is found from SMBIOS Table, use DUID-UUID type.
- //
- if ((PcdGet8 (PcdDhcp6UidType) == Dhcp6DuidTypeUuid) && !EFI_ERROR (NetLibGetSystemGuid (&Uuid)) && !CompareGuid (&Uuid, &gZeroGuid)) {
- //
- //
- // The format of DUID-UUID:
- //
- // 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
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- // | DUID-Type (4) | UUID (128 bits) |
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
- // | |
- // | |
- // | -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- // | |
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
- //
- // sizeof (option-len + Duid-type + UUID-size) = 20 bytes
- //
- Duid = AllocateZeroPool (2 + 2 + sizeof (EFI_GUID));
- if (Duid == NULL) {
- return NULL;
- }
- //
- // sizeof (Duid-type + UUID-size) = 18 bytes
- //
- Duid->Length = (UINT16)(18);
- //
- // Set the Duid-type and copy UUID.
- //
- WriteUnaligned16 ((UINT16 *)(Duid->Duid), HTONS (Dhcp6DuidTypeUuid));
- CopyMem (Duid->Duid + 2, &Uuid, sizeof (EFI_GUID));
- } else {
- //
- //
- // The format of DUID-LLT:
- //
- // 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
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- // | Duid type (1) | hardware type (16 bits) |
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- // | time (32 bits) |
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- // . .
- // . link-layer address (variable length) .
- // . .
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- //
- //
- // Generate a time stamp of the seconds from 2000/1/1, assume 30day/month.
- //
- gRT->GetTime (&Time, NULL);
- Stamp = (UINT32)
- (
- ((((UINT32)(Time.Year - 2000) * 360 + (Time.Month - 1) * 30 + (Time.Day - 1)) * 24 + Time.Hour) * 60 + Time.Minute) *
- 60 +
- Time.Second
- );
- //
- // sizeof (option-len + Duid-type + hardware-type + time) = 10 bytes
- //
- Duid = AllocateZeroPool (10 + Mode->HwAddressSize);
- if (Duid == NULL) {
- return NULL;
- }
- //
- // sizeof (Duid-type + hardware-type + time) = 8 bytes
- //
- Duid->Length = (UINT16)(Mode->HwAddressSize + 8);
- //
- // Set the Duid-type, hardware-type, time and copy the hardware address.
- //
- WriteUnaligned16 ((UINT16 *)((UINT8 *)Duid + OFFSET_OF (EFI_DHCP6_DUID, Duid)), HTONS (Dhcp6DuidTypeLlt));
- WriteUnaligned16 ((UINT16 *)((UINT8 *)Duid + OFFSET_OF (EFI_DHCP6_DUID, Duid) + 2), HTONS (NET_IFTYPE_ETHERNET));
- WriteUnaligned32 ((UINT32 *)((UINT8 *)Duid + OFFSET_OF (EFI_DHCP6_DUID, Duid) + 4), HTONL (Stamp));
- CopyMem (Duid->Duid + 8, &Mode->CurrentAddress, Mode->HwAddressSize);
- }
- Status = gRT->SetVariable (
- L"ClientId",
- &gEfiDhcp6ServiceBindingProtocolGuid,
- (EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS),
- Duid->Length + 2,
- (VOID *)Duid
- );
- if (EFI_ERROR (Status)) {
- FreePool (Duid);
- return NULL;
- }
- return Duid;
- }
- /**
- Copy the Dhcp6 configure data.
- @param[in] DstCfg The pointer to the destination configure data.
- @param[in] SorCfg The pointer to the source configure data.
- @retval EFI_SUCCESS Copy the content from SorCfg from DstCfg successfully.
- @retval EFI_OUT_OF_RESOURCES Required system resources could not be allocated.
- **/
- EFI_STATUS
- Dhcp6CopyConfigData (
- IN EFI_DHCP6_CONFIG_DATA *DstCfg,
- IN EFI_DHCP6_CONFIG_DATA *SorCfg
- )
- {
- UINTN Index;
- UINTN OptionListSize;
- UINTN OptionSize;
- CopyMem (DstCfg, SorCfg, sizeof (EFI_DHCP6_CONFIG_DATA));
- //
- // Allocate another buffer for solicitretransmission, and copy it.
- //
- if (SorCfg->SolicitRetransmission != NULL) {
- DstCfg->SolicitRetransmission = AllocateZeroPool (sizeof (EFI_DHCP6_RETRANSMISSION));
- if (DstCfg->SolicitRetransmission == NULL) {
- //
- // Error will be handled out of this function.
- //
- return EFI_OUT_OF_RESOURCES;
- }
- CopyMem (
- DstCfg->SolicitRetransmission,
- SorCfg->SolicitRetransmission,
- sizeof (EFI_DHCP6_RETRANSMISSION)
- );
- }
- if ((SorCfg->OptionList != NULL) && (SorCfg->OptionCount != 0)) {
- OptionListSize = SorCfg->OptionCount * sizeof (EFI_DHCP6_PACKET_OPTION *);
- DstCfg->OptionList = AllocateZeroPool (OptionListSize);
- if (DstCfg->OptionList == NULL) {
- //
- // Error will be handled out of this function.
- //
- return EFI_OUT_OF_RESOURCES;
- }
- for (Index = 0; Index < SorCfg->OptionCount; Index++) {
- OptionSize = NTOHS (SorCfg->OptionList[Index]->OpLen) + 4;
- DstCfg->OptionList[Index] = AllocateZeroPool (OptionSize);
- if (DstCfg->OptionList[Index] == NULL) {
- //
- // Error will be handled out of this function.
- //
- return EFI_OUT_OF_RESOURCES;
- }
- CopyMem (
- DstCfg->OptionList[Index],
- SorCfg->OptionList[Index],
- OptionSize
- );
- }
- }
- return EFI_SUCCESS;
- }
- /**
- Clean up the configure data.
- @param[in, out] CfgData The pointer to the configure data.
- **/
- VOID
- Dhcp6CleanupConfigData (
- IN OUT EFI_DHCP6_CONFIG_DATA *CfgData
- )
- {
- UINTN Index;
- ASSERT (CfgData != NULL);
- //
- // Clean up all fields in config data including the reference buffers, but do
- // not free the config data buffer itself.
- //
- if (CfgData->OptionList != NULL) {
- for (Index = 0; Index < CfgData->OptionCount; Index++) {
- if (CfgData->OptionList[Index] != NULL) {
- FreePool (CfgData->OptionList[Index]);
- }
- }
- FreePool (CfgData->OptionList);
- }
- if (CfgData->SolicitRetransmission != NULL) {
- FreePool (CfgData->SolicitRetransmission);
- }
- ZeroMem (CfgData, sizeof (EFI_DHCP6_CONFIG_DATA));
- }
- /**
- Clean up the mode data.
- @param[in, out] ModeData The pointer to the mode data.
- **/
- VOID
- Dhcp6CleanupModeData (
- IN OUT EFI_DHCP6_MODE_DATA *ModeData
- )
- {
- ASSERT (ModeData != NULL);
- //
- // Clean up all fields in mode data including the reference buffers, but do
- // not free the mode data buffer itself.
- //
- if (ModeData->ClientId != NULL) {
- FreePool (ModeData->ClientId);
- }
- if (ModeData->Ia != NULL) {
- if (ModeData->Ia->ReplyPacket != NULL) {
- FreePool (ModeData->Ia->ReplyPacket);
- }
- FreePool (ModeData->Ia);
- }
- ZeroMem (ModeData, sizeof (EFI_DHCP6_MODE_DATA));
- }
- /**
- Calculate the expire time by the algorithm defined in rfc.
- @param[in] Base The base value of the time.
- @param[in] IsFirstRt If TRUE, it is the first time to calculate expire time.
- @param[in] NeedSigned If TRUE, the signed factor is needed.
- @return Expire The calculated result for the new expire time.
- **/
- UINT32
- Dhcp6CalculateExpireTime (
- IN UINT32 Base,
- IN BOOLEAN IsFirstRt,
- IN BOOLEAN NeedSigned
- )
- {
- EFI_TIME Time;
- BOOLEAN Signed;
- UINT32 Seed;
- UINT32 Expire;
- //
- // Take the 10bits of microsecond in system time as a uniform distribution.
- // Take the 10th bit as a flag to determine it's signed or not.
- //
- gRT->GetTime (&Time, NULL);
- Seed = ((Time.Nanosecond >> 10) & DHCP6_10_BIT_MASK);
- Signed = (BOOLEAN)((((Time.Nanosecond >> 9) & 0x01) != 0) ? TRUE : FALSE);
- Signed = (BOOLEAN)(NeedSigned ? Signed : FALSE);
- //
- // Calculate expire by the following algo:
- // 1. base + base * (-0.1 ~ 0) for the first solicit
- // 2. base + base * (-0.1 ~ 0.1) for the first other messages
- // 3. 2 * base + base * (-0.1 ~ 0.1) for the subsequent all messages
- // 4. base + base * (-0.1 ~ 0) for the more than mrt timeout
- //
- // The (Seed / 0x3ff / 10) is used to a random range (0, 0.1).
- //
- if (IsFirstRt && Signed) {
- Expire = Base - (UINT32)(Base * Seed / DHCP6_10_BIT_MASK / 10);
- } else if (IsFirstRt && !Signed) {
- Expire = Base + (UINT32)(Base * Seed / DHCP6_10_BIT_MASK / 10);
- } else if (!IsFirstRt && Signed) {
- Expire = 2 * Base - (UINT32)(Base * Seed / DHCP6_10_BIT_MASK / 10);
- } else {
- Expire = 2 * Base + (UINT32)(Base * Seed / DHCP6_10_BIT_MASK / 10);
- }
- Expire = (Expire != 0) ? Expire : 1;
- return Expire;
- }
- /**
- Calculate the lease time by the algorithm defined in rfc.
- @param[in] IaCb The pointer to the Ia control block.
- **/
- VOID
- Dhcp6CalculateLeaseTime (
- IN DHCP6_IA_CB *IaCb
- )
- {
- UINT32 MinLt;
- UINT32 MaxLt;
- UINTN Index;
- ASSERT (IaCb->Ia->IaAddressCount > 0);
- MinLt = (UINT32)(-1);
- MaxLt = 0;
- //
- // Calculate minlt as min of all valid life time, and maxlt as max of all
- // valid life time.
- //
- for (Index = 0; Index < IaCb->Ia->IaAddressCount; Index++) {
- MinLt = MIN (MinLt, IaCb->Ia->IaAddress[Index].ValidLifetime);
- MaxLt = MAX (MinLt, IaCb->Ia->IaAddress[Index].ValidLifetime);
- }
- //
- // Take 50% minlt as t1, and 80% maxlt as t2 if Dhcp6 server doesn't offer
- // such information.
- //
- IaCb->T1 = (IaCb->T1 != 0) ? IaCb->T1 : (UINT32)(MinLt * 5 / 10);
- IaCb->T2 = (IaCb->T2 != 0) ? IaCb->T2 : (UINT32)(MinLt * 8 / 10);
- IaCb->AllExpireTime = MaxLt;
- IaCb->LeaseTime = 0;
- }
- /**
- Check whether the addresses are all included by the configured Ia.
- @param[in] Ia The pointer to the Ia.
- @param[in] AddressCount The number of addresses.
- @param[in] Addresses The pointer to the addresses buffer.
- @retval EFI_SUCCESS The addresses are all included by the configured IA.
- @retval EFI_NOT_FOUND The addresses are not included by the configured IA.
- **/
- EFI_STATUS
- Dhcp6CheckAddress (
- IN EFI_DHCP6_IA *Ia,
- IN UINT32 AddressCount,
- IN EFI_IPv6_ADDRESS *Addresses
- )
- {
- UINTN Index1;
- UINTN Index2;
- BOOLEAN Found;
- //
- // Check whether the addresses are all included by the configured IA. And it
- // will return success if address count is zero, which means all addresses.
- //
- for (Index1 = 0; Index1 < AddressCount; Index1++) {
- Found = FALSE;
- for (Index2 = 0; Index2 < Ia->IaAddressCount; Index2++) {
- if (CompareMem (
- &Addresses[Index1],
- &Ia->IaAddress[Index2],
- sizeof (EFI_IPv6_ADDRESS)
- ) == 0)
- {
- Found = TRUE;
- break;
- }
- }
- if (!Found) {
- return EFI_NOT_FOUND;
- }
- }
- return EFI_SUCCESS;
- }
- /**
- Deprive the addresses from current Ia, and generate another eliminated Ia.
- @param[in] Ia The pointer to the Ia.
- @param[in] AddressCount The number of addresses.
- @param[in] Addresses The pointer to the addresses buffer.
- @retval NULL If it failed to generate the deprived Ia.
- @retval others The pointer to the deprived Ia.
- **/
- EFI_DHCP6_IA *
- Dhcp6DepriveAddress (
- IN EFI_DHCP6_IA *Ia,
- IN UINT32 AddressCount,
- IN EFI_IPv6_ADDRESS *Addresses
- )
- {
- EFI_DHCP6_IA *IaCopy;
- UINTN IaCopySize;
- UINTN Index1;
- UINTN Index2;
- BOOLEAN Found;
- if (AddressCount == 0) {
- //
- // It means release all Ia addresses if address count is zero.
- //
- AddressCount = Ia->IaAddressCount;
- }
- ASSERT (AddressCount != 0);
- IaCopySize = sizeof (EFI_DHCP6_IA) + (AddressCount - 1) * sizeof (EFI_DHCP6_IA_ADDRESS);
- IaCopy = AllocateZeroPool (IaCopySize);
- if (IaCopy == NULL) {
- return NULL;
- }
- if (AddressCount == Ia->IaAddressCount) {
- //
- // If release all Ia addresses, just copy the configured Ia and then set
- // its address count as zero.
- // We may decline/release part of addresses at the beginning. So it's a
- // forwarding step to update address infor for decline/release, while the
- // other infor such as Ia state will be updated when receiving reply.
- //
- CopyMem (IaCopy, Ia, IaCopySize);
- Ia->IaAddressCount = 0;
- return IaCopy;
- }
- CopyMem (IaCopy, Ia, sizeof (EFI_DHCP6_IA));
- //
- // Move the addresses from the Ia of instance to the deprived Ia.
- //
- for (Index1 = 0; Index1 < AddressCount; Index1++) {
- Found = FALSE;
- for (Index2 = 0; Index2 < Ia->IaAddressCount; Index2++) {
- if (CompareMem (
- &Addresses[Index1],
- &Ia->IaAddress[Index2],
- sizeof (EFI_IPv6_ADDRESS)
- ) == 0)
- {
- //
- // Copy the deprived address to the copy of Ia
- //
- CopyMem (
- &IaCopy->IaAddress[Index1],
- &Ia->IaAddress[Index2],
- sizeof (EFI_DHCP6_IA_ADDRESS)
- );
- //
- // Delete the deprived address from the instance Ia
- //
- if (Index2 + 1 < Ia->IaAddressCount) {
- CopyMem (
- &Ia->IaAddress[Index2],
- &Ia->IaAddress[Index2 + 1],
- (Ia->IaAddressCount - Index2 - 1) * sizeof (EFI_DHCP6_IA_ADDRESS)
- );
- }
- Found = TRUE;
- break;
- }
- }
- ASSERT (Found == TRUE);
- }
- Ia->IaAddressCount -= AddressCount;
- IaCopy->IaAddressCount = AddressCount;
- return IaCopy;
- }
- /**
- The dummy ext buffer free callback routine.
- @param[in] Arg The pointer to the parameter.
- **/
- VOID
- EFIAPI
- Dhcp6DummyExtFree (
- IN VOID *Arg
- )
- {
- }
- /**
- The callback routine once message transmitted.
- @param[in] Wrap The pointer to the received net buffer.
- @param[in] EndPoint The pointer to the udp end point.
- @param[in] IoStatus The return status from udp io.
- @param[in] Context The opaque parameter to the function.
- **/
- VOID
- EFIAPI
- Dhcp6OnTransmitted (
- IN NET_BUF *Wrap,
- IN UDP_END_POINT *EndPoint,
- IN EFI_STATUS IoStatus,
- IN VOID *Context
- )
- {
- NetbufFree (Wrap);
- }
- /**
- Append the option to Buf, and move Buf to the end.
- @param[in, out] Buf The pointer to the buffer.
- @param[in] OptType The option type.
- @param[in] OptLen The length of option contents.
- @param[in] Data The pointer to the option content.
- @return Buf The position to append the next option.
- **/
- UINT8 *
- Dhcp6AppendOption (
- IN OUT UINT8 *Buf,
- IN UINT16 OptType,
- IN UINT16 OptLen,
- IN UINT8 *Data
- )
- {
- //
- // The format of Dhcp6 option:
- //
- // 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
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- // | option-code | option-len (option data) |
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- // | option-data |
- // | (option-len octets) |
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- //
- ASSERT (OptLen != 0);
- WriteUnaligned16 ((UINT16 *)Buf, OptType);
- Buf += 2;
- WriteUnaligned16 ((UINT16 *)Buf, OptLen);
- Buf += 2;
- CopyMem (Buf, Data, NTOHS (OptLen));
- Buf += NTOHS (OptLen);
- return Buf;
- }
- /**
- Append the appointed IA Address option to Buf, and move Buf to the end.
- @param[in, out] Buf The pointer to the position to append.
- @param[in] IaAddr The pointer to the IA Address.
- @param[in] MessageType Message type of DHCP6 package.
- @return Buf The position to append the next option.
- **/
- UINT8 *
- Dhcp6AppendIaAddrOption (
- IN OUT UINT8 *Buf,
- IN EFI_DHCP6_IA_ADDRESS *IaAddr,
- IN UINT32 MessageType
- )
- {
- // The format of the IA Address option is:
- //
- // 0 1 2 3
- // 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
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- // | OPTION_IAADDR | option-len |
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- // | |
- // | IPv6 address |
- // | |
- // | |
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- // | preferred-lifetime |
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- // | valid-lifetime |
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- // . .
- // . IAaddr-options .
- // . .
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- //
- // Fill the value of Ia Address option type
- //
- WriteUnaligned16 ((UINT16 *)Buf, HTONS (Dhcp6OptIaAddr));
- Buf += 2;
- WriteUnaligned16 ((UINT16 *)Buf, HTONS (sizeof (EFI_DHCP6_IA_ADDRESS)));
- Buf += 2;
- CopyMem (Buf, &IaAddr->IpAddress, sizeof (EFI_IPv6_ADDRESS));
- Buf += sizeof (EFI_IPv6_ADDRESS);
- //
- // Fill the value of preferred-lifetime and valid-lifetime.
- // According to RFC3315 Chapter 18.1.2, the preferred-lifetime and valid-lifetime fields
- // should set to 0 when initiate a Confirm message.
- //
- if (MessageType != Dhcp6MsgConfirm) {
- WriteUnaligned32 ((UINT32 *)Buf, HTONL (IaAddr->PreferredLifetime));
- }
- Buf += 4;
- if (MessageType != Dhcp6MsgConfirm) {
- WriteUnaligned32 ((UINT32 *)Buf, HTONL (IaAddr->ValidLifetime));
- }
- Buf += 4;
- return Buf;
- }
- /**
- Append the appointed Ia option to Buf, and move Buf to the end.
- @param[in, out] Buf The pointer to the position to append.
- @param[in] Ia The pointer to the Ia.
- @param[in] T1 The time of T1.
- @param[in] T2 The time of T2.
- @param[in] MessageType Message type of DHCP6 package.
- @return Buf The position to append the next Ia option.
- **/
- UINT8 *
- Dhcp6AppendIaOption (
- IN OUT UINT8 *Buf,
- IN EFI_DHCP6_IA *Ia,
- IN UINT32 T1,
- IN UINT32 T2,
- IN UINT32 MessageType
- )
- {
- UINT8 *AddrOpt;
- UINT16 *Len;
- UINTN Index;
- //
- // The format of IA_NA and IA_TA option:
- //
- // 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
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- // | OPTION_IA_NA | option-len |
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- // | IAID (4 octets) |
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- // | T1 (only for IA_NA) |
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- // | T2 (only for IA_NA) |
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- // | |
- // . IA_NA-options/IA_TA-options .
- // . .
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- //
- //
- // Fill the value of Ia option type
- //
- WriteUnaligned16 ((UINT16 *)Buf, HTONS (Ia->Descriptor.Type));
- Buf += 2;
- //
- // Fill the len of Ia option later, keep the pointer first
- //
- Len = (UINT16 *)Buf;
- Buf += 2;
- //
- // Fill the value of iaid
- //
- WriteUnaligned32 ((UINT32 *)Buf, HTONL (Ia->Descriptor.IaId));
- Buf += 4;
- //
- // Fill the value of t1 and t2 if iana, keep it 0xffffffff if no specified.
- //
- if (Ia->Descriptor.Type == Dhcp6OptIana) {
- WriteUnaligned32 ((UINT32 *)Buf, HTONL ((T1 != 0) ? T1 : 0xffffffff));
- Buf += 4;
- WriteUnaligned32 ((UINT32 *)Buf, HTONL ((T2 != 0) ? T2 : 0xffffffff));
- Buf += 4;
- }
- //
- // Fill all the addresses belong to the Ia
- //
- for (Index = 0; Index < Ia->IaAddressCount; Index++) {
- AddrOpt = (UINT8 *)Ia->IaAddress + Index * sizeof (EFI_DHCP6_IA_ADDRESS);
- Buf = Dhcp6AppendIaAddrOption (Buf, (EFI_DHCP6_IA_ADDRESS *)AddrOpt, MessageType);
- }
- //
- // Fill the value of Ia option length
- //
- *Len = HTONS ((UINT16)(Buf - (UINT8 *)Len - 2));
- return Buf;
- }
- /**
- Append the appointed Elapsed time option to Buf, and move Buf to the end.
- @param[in, out] Buf The pointer to the position to append.
- @param[in] Instance The pointer to the Dhcp6 instance.
- @param[out] Elapsed The pointer to the elapsed time value in
- the generated packet.
- @return Buf The position to append the next Ia option.
- **/
- UINT8 *
- Dhcp6AppendETOption (
- IN OUT UINT8 *Buf,
- IN DHCP6_INSTANCE *Instance,
- OUT UINT16 **Elapsed
- )
- {
- //
- // The format of elapsed time option:
- //
- // 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
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- // | OPTION_ELAPSED_TIME | option-len |
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- // | elapsed-time |
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- //
- //
- // Fill the value of elapsed-time option type.
- //
- WriteUnaligned16 ((UINT16 *)Buf, HTONS (Dhcp6OptElapsedTime));
- Buf += 2;
- //
- // Fill the len of elapsed-time option, which is fixed.
- //
- WriteUnaligned16 ((UINT16 *)Buf, HTONS (2));
- Buf += 2;
- //
- // Fill in elapsed time value with 0 value for now. The actual value is
- // filled in later just before the packet is transmitted.
- //
- WriteUnaligned16 ((UINT16 *)Buf, HTONS (0));
- *Elapsed = (UINT16 *)Buf;
- Buf += 2;
- return Buf;
- }
- /**
- Set the elapsed time based on the given instance and the pointer to the
- elapsed time option.
- @param[in] Elapsed The pointer to the position to append.
- @param[in] Instance The pointer to the Dhcp6 instance.
- **/
- VOID
- SetElapsedTime (
- IN UINT16 *Elapsed,
- IN DHCP6_INSTANCE *Instance
- )
- {
- EFI_TIME Time;
- UINT64 CurrentStamp;
- UINT64 ElapsedTimeValue;
- //
- // Generate a time stamp of the centiseconds from 2000/1/1, assume 30day/month.
- //
- gRT->GetTime (&Time, NULL);
- CurrentStamp = MultU64x32 (
- ((((UINT32)(Time.Year - 2000) * 360 + (Time.Month - 1) * 30 + (Time.Day - 1)) * 24 + Time.Hour) * 60 + Time.Minute) * 60 + Time.Second,
- 100
- ) +
- DivU64x32 (
- Time.Nanosecond,
- 10000000
- );
- //
- // Sentinel value of 0 means that this is the first DHCP packet that we are
- // sending and that we need to initialize the value. First DHCP message
- // gets 0 elapsed-time. Otherwise, calculate based on StartTime.
- //
- if (Instance->StartTime == 0) {
- ElapsedTimeValue = 0;
- Instance->StartTime = CurrentStamp;
- } else {
- ElapsedTimeValue = CurrentStamp - Instance->StartTime;
- //
- // If elapsed time cannot fit in two bytes, set it to 0xffff.
- //
- if (ElapsedTimeValue > 0xffff) {
- ElapsedTimeValue = 0xffff;
- }
- }
- WriteUnaligned16 (Elapsed, HTONS ((UINT16)ElapsedTimeValue));
- }
- /**
- Seek the address of the first byte of the option header.
- @param[in] Buf The pointer to the buffer.
- @param[in] SeekLen The length to seek.
- @param[in] OptType The option type.
- @retval NULL If it failed to seek the option.
- @retval others The position to the option.
- **/
- UINT8 *
- Dhcp6SeekOption (
- IN UINT8 *Buf,
- IN UINT32 SeekLen,
- IN UINT16 OptType
- )
- {
- UINT8 *Cursor;
- UINT8 *Option;
- UINT16 DataLen;
- UINT16 OpCode;
- Option = NULL;
- Cursor = Buf;
- //
- // The format of Dhcp6 option refers to Dhcp6AppendOption().
- //
- while (Cursor < Buf + SeekLen) {
- OpCode = ReadUnaligned16 ((UINT16 *)Cursor);
- if (OpCode == HTONS (OptType)) {
- Option = Cursor;
- break;
- }
- DataLen = NTOHS (ReadUnaligned16 ((UINT16 *)(Cursor + 2)));
- Cursor += (DataLen + 4);
- }
- return Option;
- }
- /**
- Seek the address of the first byte of the Ia option header.
- @param[in] Buf The pointer to the buffer.
- @param[in] SeekLen The length to seek.
- @param[in] IaDesc The pointer to the Ia descriptor.
- @retval NULL If it failed to seek the Ia option.
- @retval others The position to the Ia option.
- **/
- UINT8 *
- Dhcp6SeekIaOption (
- IN UINT8 *Buf,
- IN UINT32 SeekLen,
- IN EFI_DHCP6_IA_DESCRIPTOR *IaDesc
- )
- {
- UINT8 *Cursor;
- UINT8 *Option;
- UINT16 DataLen;
- UINT16 OpCode;
- UINT32 IaId;
- //
- // The format of IA_NA and IA_TA option refers to Dhcp6AppendIaOption().
- //
- Option = NULL;
- Cursor = Buf;
- while (Cursor < Buf + SeekLen) {
- OpCode = ReadUnaligned16 ((UINT16 *)Cursor);
- IaId = ReadUnaligned32 ((UINT32 *)(Cursor + 4));
- if ((OpCode == HTONS (IaDesc->Type)) && (IaId == HTONL (IaDesc->IaId))) {
- Option = Cursor;
- break;
- }
- DataLen = NTOHS (ReadUnaligned16 ((UINT16 *)(Cursor + 2)));
- Cursor += (DataLen + 4);
- }
- return Option;
- }
- /**
- Check whether the incoming IPv6 address in IaAddr is one of the maintained
- addresses in the IA control block.
- @param[in] IaAddr The pointer to the IA Address to be checked.
- @param[in] CurrentIa The pointer to the IA in IA control block.
- @retval TRUE Yes, this Address is already in IA control block.
- @retval FALSE No, this Address is NOT in IA control block.
- **/
- BOOLEAN
- Dhcp6AddrIsInCurrentIa (
- IN EFI_DHCP6_IA_ADDRESS *IaAddr,
- IN EFI_DHCP6_IA *CurrentIa
- )
- {
- UINT32 Index;
- ASSERT (IaAddr != NULL && CurrentIa != NULL);
- for (Index = 0; Index < CurrentIa->IaAddressCount; Index++) {
- if (EFI_IP6_EQUAL (&IaAddr->IpAddress, &CurrentIa->IaAddress[Index].IpAddress)) {
- return TRUE;
- }
- }
- return FALSE;
- }
- /**
- Parse the address option and update the address information.
- @param[in] CurrentIa The pointer to the Ia Address in control block.
- @param[in] IaInnerOpt The pointer to the buffer.
- @param[in] IaInnerLen The length to parse.
- @param[out] AddrNum The number of addresses.
- @param[in, out] AddrBuf The pointer to the address buffer.
- **/
- VOID
- Dhcp6ParseAddrOption (
- IN EFI_DHCP6_IA *CurrentIa,
- IN UINT8 *IaInnerOpt,
- IN UINT16 IaInnerLen,
- OUT UINT32 *AddrNum,
- IN OUT EFI_DHCP6_IA_ADDRESS *AddrBuf
- )
- {
- UINT8 *Cursor;
- UINT16 DataLen;
- UINT16 OpCode;
- UINT32 ValidLt;
- UINT32 PreferredLt;
- EFI_DHCP6_IA_ADDRESS *IaAddr;
- //
- // The format of the IA Address option:
- //
- // 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
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- // | OPTION_IAADDR | option-len |
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- // | |
- // | IPv6 address |
- // | |
- // | |
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- // | preferred-lifetime |
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- // | valid-lifetime |
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- // . .
- // . IAaddr-options .
- // . .
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- //
- //
- // Two usage model:
- //
- // 1. Pass addrbuf == null, to get the addrnum over the Ia inner options.
- // 2. Pass addrbuf != null, to resolve the addresses over the Ia inner
- // options to the addrbuf.
- //
- Cursor = IaInnerOpt;
- *AddrNum = 0;
- while (Cursor < IaInnerOpt + IaInnerLen) {
- //
- // Refer to RFC3315 Chapter 18.1.8, we need to update lifetimes for any addresses in the IA option
- // that the client already has recorded in the IA, and discard the Ia address option with 0 valid time.
- //
- OpCode = ReadUnaligned16 ((UINT16 *)Cursor);
- PreferredLt = NTOHL (ReadUnaligned32 ((UINT32 *)(Cursor + 20)));
- ValidLt = NTOHL (ReadUnaligned32 ((UINT32 *)(Cursor + 24)));
- IaAddr = (EFI_DHCP6_IA_ADDRESS *)(Cursor + 4);
- if ((OpCode == HTONS (Dhcp6OptIaAddr)) && (ValidLt >= PreferredLt) &&
- (Dhcp6AddrIsInCurrentIa (IaAddr, CurrentIa) || (ValidLt != 0)))
- {
- if (AddrBuf != NULL) {
- CopyMem (AddrBuf, IaAddr, sizeof (EFI_DHCP6_IA_ADDRESS));
- AddrBuf->PreferredLifetime = PreferredLt;
- AddrBuf->ValidLifetime = ValidLt;
- AddrBuf = (EFI_DHCP6_IA_ADDRESS *)((UINT8 *)AddrBuf + sizeof (EFI_DHCP6_IA_ADDRESS));
- }
- (*AddrNum)++;
- }
- DataLen = NTOHS (ReadUnaligned16 ((UINT16 *)(Cursor + 2)));
- Cursor += (DataLen + 4);
- }
- }
- /**
- Create a control block for the Ia according to the corresponding options.
- @param[in] Instance The pointer to DHCP6 Instance.
- @param[in] IaInnerOpt The pointer to the inner options in the Ia option.
- @param[in] IaInnerLen The length of all the inner options in the Ia option.
- @param[in] T1 T1 time in the Ia option.
- @param[in] T2 T2 time in the Ia option.
- @retval EFI_NOT_FOUND No valid IA option is found.
- @retval EFI_SUCCESS Create an IA control block successfully.
- @retval EFI_OUT_OF_RESOURCES Required system resources could not be allocated.
- @retval EFI_DEVICE_ERROR An unexpected error.
- **/
- EFI_STATUS
- Dhcp6GenerateIaCb (
- IN DHCP6_INSTANCE *Instance,
- IN UINT8 *IaInnerOpt,
- IN UINT16 IaInnerLen,
- IN UINT32 T1,
- IN UINT32 T2
- )
- {
- UINT32 AddrNum;
- UINT32 IaSize;
- EFI_DHCP6_IA *Ia;
- if (Instance->IaCb.Ia == NULL) {
- return EFI_DEVICE_ERROR;
- }
- //
- // Calculate the number of addresses for this Ia, excluding the addresses with
- // the value 0 of valid lifetime.
- //
- Dhcp6ParseAddrOption (Instance->IaCb.Ia, IaInnerOpt, IaInnerLen, &AddrNum, NULL);
- if (AddrNum == 0) {
- return EFI_NOT_FOUND;
- }
- //
- // Allocate for new IA.
- //
- IaSize = sizeof (EFI_DHCP6_IA) + (AddrNum - 1) * sizeof (EFI_DHCP6_IA_ADDRESS);
- Ia = AllocateZeroPool (IaSize);
- if (Ia == NULL) {
- return EFI_OUT_OF_RESOURCES;
- }
- //
- // Fill up this new IA fields.
- //
- Ia->State = Instance->IaCb.Ia->State;
- Ia->IaAddressCount = AddrNum;
- CopyMem (&Ia->Descriptor, &Instance->Config->IaDescriptor, sizeof (EFI_DHCP6_IA_DESCRIPTOR));
- Dhcp6ParseAddrOption (Instance->IaCb.Ia, IaInnerOpt, IaInnerLen, &AddrNum, Ia->IaAddress);
- //
- // Free original IA resource.
- //
- if (Instance->IaCb.Ia->ReplyPacket != NULL) {
- FreePool (Instance->IaCb.Ia->ReplyPacket);
- }
- FreePool (Instance->IaCb.Ia);
- ZeroMem (&Instance->IaCb, sizeof (DHCP6_IA_CB));
- //
- // Update IaCb to use new IA.
- //
- Instance->IaCb.Ia = Ia;
- //
- // Fill in IaCb fields. Such as T1, T2, AllExpireTime and LeaseTime.
- //
- Instance->IaCb.T1 = T1;
- Instance->IaCb.T2 = T2;
- Dhcp6CalculateLeaseTime (&Instance->IaCb);
- return EFI_SUCCESS;
- }
- /**
- Cache the current IA configuration information.
- @param[in] Instance The pointer to DHCP6 Instance.
- @retval EFI_SUCCESS Cache the current IA successfully.
- @retval EFI_OUT_OF_RESOURCES Required system resources could not be allocated.
- **/
- EFI_STATUS
- Dhcp6CacheIa (
- IN DHCP6_INSTANCE *Instance
- )
- {
- UINTN IaSize;
- EFI_DHCP6_IA *Ia;
- Ia = Instance->IaCb.Ia;
- if ((Instance->CacheIa == NULL) && (Ia != NULL)) {
- //
- // Cache the current IA.
- //
- IaSize = sizeof (EFI_DHCP6_IA) + (Ia->IaAddressCount - 1) * sizeof (EFI_DHCP6_IA_ADDRESS);
- Instance->CacheIa = AllocateZeroPool (IaSize);
- if (Instance->CacheIa == NULL) {
- return EFI_OUT_OF_RESOURCES;
- }
- CopyMem (Instance->CacheIa, Ia, IaSize);
- }
- return EFI_SUCCESS;
- }
- /**
- Append CacheIa to the current IA. Meanwhile, clear CacheIa.ValidLifetime to 0.
- @param[in] Instance The pointer to DHCP6 instance.
- **/
- VOID
- Dhcp6AppendCacheIa (
- IN DHCP6_INSTANCE *Instance
- )
- {
- UINT8 *Ptr;
- UINTN Index;
- UINTN IaSize;
- UINTN NewIaSize;
- EFI_DHCP6_IA *Ia;
- EFI_DHCP6_IA *NewIa;
- EFI_DHCP6_IA *CacheIa;
- Ia = Instance->IaCb.Ia;
- CacheIa = Instance->CacheIa;
- if ((CacheIa != NULL) && (CacheIa->IaAddressCount != 0)) {
- //
- // There are old addresses existing. Merge with current addresses.
- //
- NewIaSize = sizeof (EFI_DHCP6_IA) + (Ia->IaAddressCount + CacheIa->IaAddressCount - 1) * sizeof (EFI_DHCP6_IA_ADDRESS);
- NewIa = AllocateZeroPool (NewIaSize);
- if (NewIa == NULL) {
- return;
- }
- IaSize = sizeof (EFI_DHCP6_IA) + (Ia->IaAddressCount - 1) * sizeof (EFI_DHCP6_IA_ADDRESS);
- CopyMem (NewIa, Ia, IaSize);
- //
- // Clear old address.ValidLifetime
- //
- for (Index = 0; Index < CacheIa->IaAddressCount; Index++) {
- CacheIa->IaAddress[Index].ValidLifetime = 0;
- }
- NewIa->IaAddressCount += CacheIa->IaAddressCount;
- Ptr = (UINT8 *)&NewIa->IaAddress[Ia->IaAddressCount];
- CopyMem (Ptr, CacheIa->IaAddress, CacheIa->IaAddressCount * sizeof (EFI_DHCP6_IA_ADDRESS));
- //
- // Migrate to the NewIa and free previous.
- //
- FreePool (Instance->CacheIa);
- FreePool (Instance->IaCb.Ia);
- Instance->CacheIa = NULL;
- Instance->IaCb.Ia = NewIa;
- }
- }
- /**
- Calculate the Dhcp6 get mapping timeout by adding additional delay to the IP6 DAD transmits count.
- @param[in] Ip6Cfg The pointer to Ip6 config protocol.
- @param[out] TimeOut The time out value in 100ns units.
- @retval EFI_INVALID_PARAMETER Input parameters are invalid.
- @retval EFI_SUCCESS Calculate the time out value successfully.
- **/
- EFI_STATUS
- Dhcp6GetMappingTimeOut (
- IN EFI_IP6_CONFIG_PROTOCOL *Ip6Cfg,
- OUT UINTN *TimeOut
- )
- {
- EFI_STATUS Status;
- UINTN DataSize;
- EFI_IP6_CONFIG_DUP_ADDR_DETECT_TRANSMITS DadXmits;
- if ((Ip6Cfg == NULL) || (TimeOut == NULL)) {
- return EFI_INVALID_PARAMETER;
- }
- DataSize = sizeof (EFI_IP6_CONFIG_DUP_ADDR_DETECT_TRANSMITS);
- Status = Ip6Cfg->GetData (
- Ip6Cfg,
- Ip6ConfigDataTypeDupAddrDetectTransmits,
- &DataSize,
- &DadXmits
- );
- if (EFI_ERROR (Status)) {
- return Status;
- }
- *TimeOut = TICKS_PER_SECOND * DadXmits.DupAddrDetectTransmits + DHCP6_DAD_ADDITIONAL_DELAY;
- return EFI_SUCCESS;
- }
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