/** @file
Dhcp6 internal functions implementation.
(C) Copyright 2014 Hewlett-Packard Development Company, L.P.
Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.
Copyright (c) Microsoft Corporation
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "Dhcp6Impl.h"
/**
Enqueue the packet into the retry list in case of timeout.
@param[in] Instance The pointer to the Dhcp6 instance.
@param[in] Packet The pointer to the Dhcp6 packet to retry.
@param[in] Elapsed The pointer to the elapsed time value in the packet.
@param[in] RetryCtl The pointer to the transmission control of the packet.
This parameter is optional and may be NULL.
@retval EFI_SUCCESS Successfully enqueued the packet into the retry list according
to its message type.
@retval EFI_OUT_OF_RESOURCES Required system resources could not be allocated.
@retval EFI_DEVICE_ERROR An unexpected message type.
**/
EFI_STATUS
Dhcp6EnqueueRetry (
IN DHCP6_INSTANCE *Instance,
IN EFI_DHCP6_PACKET *Packet,
IN UINT16 *Elapsed,
IN EFI_DHCP6_RETRANSMISSION *RetryCtl OPTIONAL
)
{
DHCP6_TX_CB *TxCb;
DHCP6_IA_CB *IaCb;
ASSERT (Packet != NULL);
IaCb = &Instance->IaCb;
TxCb = AllocateZeroPool (sizeof (DHCP6_TX_CB));
if (TxCb == NULL) {
return EFI_OUT_OF_RESOURCES;
}
//
// Save tx packet pointer, and it will be destroyed when reply received.
//
TxCb->TxPacket = Packet;
TxCb->Xid = Packet->Dhcp6.Header.TransactionId;
//
// Save pointer to elapsed-time value so we can update it on retransmits.
//
TxCb->Elapsed = Elapsed;
//
// Calculate the retransmission according to the message type.
//
switch (Packet->Dhcp6.Header.MessageType) {
case Dhcp6MsgSolicit:
//
// Calculate the retransmission threshold value for solicit packet.
// Use the default value by rfc-3315 if user doesn't configure.
//
if (RetryCtl == NULL) {
TxCb->RetryCtl.Irt = DHCP6_SOL_IRT;
TxCb->RetryCtl.Mrc = DHCP6_SOL_MRC;
TxCb->RetryCtl.Mrt = DHCP6_SOL_MRT;
TxCb->RetryCtl.Mrd = DHCP6_SOL_MRD;
} else {
TxCb->RetryCtl.Irt = (RetryCtl->Irt != 0) ? RetryCtl->Irt : DHCP6_SOL_IRT;
TxCb->RetryCtl.Mrc = (RetryCtl->Mrc != 0) ? RetryCtl->Mrc : DHCP6_SOL_MRC;
TxCb->RetryCtl.Mrt = (RetryCtl->Mrt != 0) ? RetryCtl->Mrt : DHCP6_SOL_MRT;
TxCb->RetryCtl.Mrd = (RetryCtl->Mrd != 0) ? RetryCtl->Mrd : DHCP6_SOL_MRD;
}
TxCb->RetryExp = Dhcp6CalculateExpireTime (
TxCb->RetryCtl.Irt,
TRUE,
FALSE
);
break;
case Dhcp6MsgRequest:
//
// Calculate the retransmission threshold value for request packet.
//
TxCb->RetryCtl.Irt = DHCP6_REQ_IRT;
TxCb->RetryCtl.Mrc = DHCP6_REQ_MRC;
TxCb->RetryCtl.Mrt = DHCP6_REQ_MRT;
TxCb->RetryCtl.Mrd = DHCP6_REQ_MRD;
TxCb->RetryExp = Dhcp6CalculateExpireTime (
TxCb->RetryCtl.Irt,
TRUE,
TRUE
);
break;
case Dhcp6MsgConfirm:
//
// Calculate the retransmission threshold value for confirm packet.
//
TxCb->RetryCtl.Irt = DHCP6_CNF_IRT;
TxCb->RetryCtl.Mrc = DHCP6_CNF_MRC;
TxCb->RetryCtl.Mrt = DHCP6_CNF_MRT;
TxCb->RetryCtl.Mrd = DHCP6_CNF_MRD;
TxCb->RetryExp = Dhcp6CalculateExpireTime (
TxCb->RetryCtl.Irt,
TRUE,
TRUE
);
break;
case Dhcp6MsgRenew:
//
// Calculate the retransmission threshold value for renew packet.
//
TxCb->RetryCtl.Irt = DHCP6_REB_IRT;
TxCb->RetryCtl.Mrc = DHCP6_REB_MRC;
TxCb->RetryCtl.Mrt = DHCP6_REB_MRT;
TxCb->RetryCtl.Mrd = IaCb->T2 - IaCb->T1;
TxCb->RetryExp = Dhcp6CalculateExpireTime (
TxCb->RetryCtl.Irt,
TRUE,
TRUE
);
break;
case Dhcp6MsgRebind:
//
// Calculate the retransmission threshold value for rebind packet.
//
TxCb->RetryCtl.Irt = DHCP6_REN_IRT;
TxCb->RetryCtl.Mrc = DHCP6_REN_MRC;
TxCb->RetryCtl.Mrt = DHCP6_REN_MRT;
TxCb->RetryCtl.Mrd = IaCb->AllExpireTime - IaCb->T2;
TxCb->RetryExp = Dhcp6CalculateExpireTime (
TxCb->RetryCtl.Irt,
TRUE,
TRUE
);
break;
case Dhcp6MsgDecline:
//
// Calculate the retransmission threshold value for decline packet.
//
TxCb->RetryCtl.Irt = DHCP6_DEC_IRT;
TxCb->RetryCtl.Mrc = DHCP6_DEC_MRC;
TxCb->RetryCtl.Mrt = DHCP6_DEC_MRT;
TxCb->RetryCtl.Mrd = DHCP6_DEC_MRD;
TxCb->RetryExp = Dhcp6CalculateExpireTime (
TxCb->RetryCtl.Irt,
TRUE,
TRUE
);
break;
case Dhcp6MsgRelease:
//
// Calculate the retransmission threshold value for release packet.
//
TxCb->RetryCtl.Irt = DHCP6_REL_IRT;
TxCb->RetryCtl.Mrc = DHCP6_REL_MRC;
TxCb->RetryCtl.Mrt = DHCP6_REL_MRT;
TxCb->RetryCtl.Mrd = DHCP6_REL_MRD;
TxCb->RetryExp = Dhcp6CalculateExpireTime (
TxCb->RetryCtl.Irt,
TRUE,
TRUE
);
break;
case Dhcp6MsgInfoRequest:
//
// Calculate the retransmission threshold value for info-request packet.
// Use the default value by rfc-3315 if user doesn't configure.
//
if (RetryCtl == NULL) {
TxCb->RetryCtl.Irt = DHCP6_INF_IRT;
TxCb->RetryCtl.Mrc = DHCP6_INF_MRC;
TxCb->RetryCtl.Mrt = DHCP6_INF_MRT;
TxCb->RetryCtl.Mrd = DHCP6_INF_MRD;
} else {
TxCb->RetryCtl.Irt = (RetryCtl->Irt != 0) ? RetryCtl->Irt : DHCP6_INF_IRT;
TxCb->RetryCtl.Mrc = (RetryCtl->Mrc != 0) ? RetryCtl->Mrc : DHCP6_INF_MRC;
TxCb->RetryCtl.Mrt = (RetryCtl->Mrt != 0) ? RetryCtl->Mrt : DHCP6_INF_MRT;
TxCb->RetryCtl.Mrd = (RetryCtl->Mrd != 0) ? RetryCtl->Mrd : DHCP6_INF_MRD;
}
TxCb->RetryExp = Dhcp6CalculateExpireTime (
TxCb->RetryCtl.Irt,
TRUE,
TRUE
);
break;
default:
//
// Unexpected message type.
//
FreePool (TxCb);
return EFI_DEVICE_ERROR;
}
//
// Insert into the retransmit list of the instance.
//
InsertTailList (&Instance->TxList, &TxCb->Link);
return EFI_SUCCESS;
}
/**
Dequeue the packet from retry list if reply received or timeout at last.
@param[in] Instance The pointer to the Dhcp6 instance.
@param[in] PacketXid The packet transaction id to match.
@param[in] NeedSignal If TRUE, then an timeout event need be signaled when it is existed.
Otherwise, this parameter is ignored.
@retval EFI_SUCCESS Successfully dequeued the packet into retry list .
@retval EFI_NOT_FOUND There is no xid matched in retry list.
**/
EFI_STATUS
Dhcp6DequeueRetry (
IN DHCP6_INSTANCE *Instance,
IN UINT32 PacketXid,
IN BOOLEAN NeedSignal
)
{
LIST_ENTRY *Entry;
LIST_ENTRY *NextEntry;
DHCP6_TX_CB *TxCb;
DHCP6_INF_CB *InfCb;
//
// Seek the retransmit node in the retransmit list by packet xid.
//
NET_LIST_FOR_EACH_SAFE (Entry, NextEntry, &Instance->TxList) {
TxCb = NET_LIST_USER_STRUCT (Entry, DHCP6_TX_CB, Link);
ASSERT (TxCb->TxPacket);
if (TxCb->Xid == PacketXid) {
if (TxCb->TxPacket->Dhcp6.Header.MessageType == Dhcp6MsgInfoRequest) {
//
// Seek the info-request node in the info-request list by packet xid.
//
NET_LIST_FOR_EACH_SAFE (Entry, NextEntry, &Instance->InfList) {
InfCb = NET_LIST_USER_STRUCT (Entry, DHCP6_INF_CB, Link);
if (InfCb->Xid == PacketXid) {
//
// Remove the info-request node, and signal the event if timeout.
//
if ((InfCb->TimeoutEvent != NULL) && NeedSignal) {
gBS->SignalEvent (InfCb->TimeoutEvent);
}
RemoveEntryList (&InfCb->Link);
FreePool (InfCb);
}
}
}
//
// Remove the retransmit node.
//
RemoveEntryList (&TxCb->Link);
ASSERT (TxCb->TxPacket);
FreePool (TxCb->TxPacket);
FreePool (TxCb);
return EFI_SUCCESS;
}
}
return EFI_NOT_FOUND;
}
/**
Clean up the specific nodes in the retry list.
@param[in] Instance The pointer to the Dhcp6 instance.
@param[in] Scope The scope of cleanup nodes.
**/
VOID
Dhcp6CleanupRetry (
IN DHCP6_INSTANCE *Instance,
IN UINT32 Scope
)
{
LIST_ENTRY *Entry;
LIST_ENTRY *NextEntry;
DHCP6_TX_CB *TxCb;
DHCP6_INF_CB *InfCb;
//
// Clean up all the stateful messages from the retransmit list.
//
if ((Scope == DHCP6_PACKET_STATEFUL) || (Scope == DHCP6_PACKET_ALL)) {
NET_LIST_FOR_EACH_SAFE (Entry, NextEntry, &Instance->TxList) {
TxCb = NET_LIST_USER_STRUCT (Entry, DHCP6_TX_CB, Link);
ASSERT (TxCb->TxPacket);
if (TxCb->TxPacket->Dhcp6.Header.MessageType != Dhcp6MsgInfoRequest) {
RemoveEntryList (&TxCb->Link);
FreePool (TxCb->TxPacket);
FreePool (TxCb);
}
}
}
//
// Clean up all the stateless messages from the retransmit list.
//
if ((Scope == DHCP6_PACKET_STATELESS) || (Scope == DHCP6_PACKET_ALL)) {
//
// Clean up all the retransmit list for stateless messages.
//
NET_LIST_FOR_EACH_SAFE (Entry, NextEntry, &Instance->TxList) {
TxCb = NET_LIST_USER_STRUCT (Entry, DHCP6_TX_CB, Link);
ASSERT (TxCb->TxPacket);
if (TxCb->TxPacket->Dhcp6.Header.MessageType == Dhcp6MsgInfoRequest) {
RemoveEntryList (&TxCb->Link);
FreePool (TxCb->TxPacket);
FreePool (TxCb);
}
}
//
// Clean up all the info-request messages list.
//
NET_LIST_FOR_EACH_SAFE (Entry, NextEntry, &Instance->InfList) {
InfCb = NET_LIST_USER_STRUCT (Entry, DHCP6_INF_CB, Link);
if (InfCb->TimeoutEvent != NULL) {
gBS->SignalEvent (InfCb->TimeoutEvent);
}
RemoveEntryList (&InfCb->Link);
FreePool (InfCb);
}
}
}
/**
Check whether the TxCb is still a valid control block in the instance's retry list.
@param[in] Instance The pointer to DHCP6_INSTANCE.
@param[in] TxCb The control block for a transmitted message.
@retval TRUE The control block is in Instance's retry list.
@retval FALSE The control block is NOT in Instance's retry list.
**/
BOOLEAN
Dhcp6IsValidTxCb (
IN DHCP6_INSTANCE *Instance,
IN DHCP6_TX_CB *TxCb
)
{
LIST_ENTRY *Entry;
NET_LIST_FOR_EACH (Entry, &Instance->TxList) {
if (TxCb == NET_LIST_USER_STRUCT (Entry, DHCP6_TX_CB, Link)) {
return TRUE;
}
}
return FALSE;
}
/**
Clean up the session of the instance stateful exchange.
@param[in, out] Instance The pointer to the Dhcp6 instance.
@param[in] Status The return status from udp.
**/
VOID
Dhcp6CleanupSession (
IN OUT DHCP6_INSTANCE *Instance,
IN EFI_STATUS Status
)
{
UINTN Index;
EFI_DHCP6_IA *Ia;
ASSERT (Instance->Config);
ASSERT (Instance->IaCb.Ia);
//
// Clean up the retransmit list for stateful messages.
//
Dhcp6CleanupRetry (Instance, DHCP6_PACKET_STATEFUL);
if (Instance->Unicast != NULL) {
FreePool (Instance->Unicast);
}
if (Instance->AdSelect != NULL) {
FreePool (Instance->AdSelect);
}
if (Instance->IaCb.Ia->ReplyPacket != NULL) {
FreePool (Instance->IaCb.Ia->ReplyPacket);
}
//
// Reinitialize the Ia fields of the instance.
//
Instance->UdpSts = Status;
Instance->AdSelect = NULL;
Instance->AdPref = 0;
Instance->Unicast = NULL;
Instance->IaCb.T1 = 0;
Instance->IaCb.T2 = 0;
Instance->IaCb.AllExpireTime = 0;
Instance->IaCb.LeaseTime = 0;
//
// Clear start time
//
Instance->StartTime = 0;
Ia = Instance->IaCb.Ia;
Ia->State = Dhcp6Init;
Ia->ReplyPacket = NULL;
//
// Set the addresses as zero lifetime, and then the notify
// function in Ip6Config will remove these timeout address.
//
for (Index = 0; Index < Ia->IaAddressCount; Index++) {
Ia->IaAddress[Index].PreferredLifetime = 0;
Ia->IaAddress[Index].ValidLifetime = 0;
}
//
//
// Signal the Ia information updated event to informal user.
//
if (Instance->Config->IaInfoEvent != NULL) {
gBS->SignalEvent (Instance->Config->IaInfoEvent);
}
}
/**
Callback to user when Dhcp6 transmit/receive occurs.
@param[in] Instance The pointer to the Dhcp6 instance.
@param[in] Event The current Dhcp6 event.
@param[in, out] Packet The pointer to the packet sending or received.
@retval EFI_SUCCESS The user function returns success.
@retval EFI_NOT_READY Direct the caller to continue collecting the offer.
@retval EFI_ABORTED The user function ask it to abort.
**/
EFI_STATUS
EFIAPI
Dhcp6CallbackUser (
IN DHCP6_INSTANCE *Instance,
IN EFI_DHCP6_EVENT Event,
IN OUT EFI_DHCP6_PACKET **Packet
)
{
EFI_STATUS Status;
EFI_DHCP6_PACKET *NewPacket;
EFI_DHCP6_CALLBACK Callback;
VOID *Context;
ASSERT (Packet != NULL);
ASSERT (Instance->Config != NULL);
ASSERT (Instance->IaCb.Ia != NULL);
NewPacket = NULL;
Status = EFI_SUCCESS;
Callback = Instance->Config->Dhcp6Callback;
Context = Instance->Config->CallbackContext;
//
// Callback to user with the new message if has.
//
if (Callback != NULL) {
Status = Callback (
&Instance->Dhcp6,
Context,
Instance->IaCb.Ia->State,
Event,
*Packet,
&NewPacket
);
//
// Updated the new packet from user to replace the original one.
//
if (NewPacket != NULL) {
ASSERT (*Packet != NULL);
FreePool (*Packet);
*Packet = NewPacket;
}
}
return Status;
}
/**
Update Ia according to the new reply message.
@param[in, out] Instance The pointer to the Dhcp6 instance.
@param[in] Packet The pointer to reply messages.
@retval EFI_SUCCESS Updated the Ia information successfully.
@retval EFI_DEVICE_ERROR An unexpected error.
**/
EFI_STATUS
Dhcp6UpdateIaInfo (
IN OUT DHCP6_INSTANCE *Instance,
IN EFI_DHCP6_PACKET *Packet
)
{
EFI_STATUS Status;
UINT8 *Option;
UINT32 OptionLen;
UINT8 *IaInnerOpt;
UINT16 IaInnerLen;
UINT16 StsCode;
UINT32 T1;
UINT32 T2;
T1 = 0;
T2 = 0;
ASSERT (Instance->Config != NULL);
// OptionLen is the length of the Options excluding the DHCP header.
// Length of the EFI_DHCP6_PACKET from the first byte of the Header field to the last
// byte of the Option[] field.
OptionLen = Packet->Length - sizeof (Packet->Dhcp6.Header);
//
// If the reply was received in response to a solicit with rapid commit option,
// request, renew or rebind message, the client updates the information it has
// recorded about IAs from the IA options contained in the reply message:
// 1. record the T1 and T2 times
// 2. add any new addresses in the IA
// 3. discard any addresses from the IA, that have a valid lifetime of 0
// 4. update lifetimes for any addresses that already recorded
// 5. leave unchanged any information about addresses
//
// See details in the section-18.1.8 of rfc-3315.
//
Option = Dhcp6SeekIaOption (
Packet->Dhcp6.Option,
OptionLen,
&Instance->Config->IaDescriptor
);
if (Option == NULL) {
return EFI_DEVICE_ERROR;
}
//
// Calculate the distance from Packet->Dhcp6.Option to the IA option.
//
// Packet->Size and Packet->Length are both UINT32 type, and Packet->Size is
// the size of the whole packet, including the DHCP header, and Packet->Length
// is the length of the DHCP message body, excluding the DHCP header.
//
// (*Option - Packet->Dhcp6.Option) is the number of bytes from the start of
// DHCP6 option area to the start of the IA option.
//
// Dhcp6SeekInnerOptionSafe() is searching starting from the start of the
// IA option to the end of the DHCP6 option area, thus subtract the space
// up until this option
//
OptionLen = OptionLen - (UINT32)(Option - Packet->Dhcp6.Option);
//
// The format of the IA_NA 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_IA_NA | option-len |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | IAID (4 octets) |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | T1 |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | T2 |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | |
// . IA_NA-options .
// . .
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
//
// The format of the IA_TA 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_IA_TA | option-len |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | IAID (4 octets) |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | |
// . IA_TA-options .
// . .
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
//
//
// Seek the inner option
//
if (EFI_ERROR (
Dhcp6SeekInnerOptionSafe (
Instance->Config->IaDescriptor.Type,
Option,
OptionLen,
&IaInnerOpt,
&IaInnerLen
)
))
{
return EFI_DEVICE_ERROR;
}
if (Instance->Config->IaDescriptor.Type == Dhcp6OptIana) {
T1 = NTOHL (ReadUnaligned32 ((UINT32 *)(DHCP6_OFFSET_OF_IA_NA_T1 (Option))));
T2 = NTOHL (ReadUnaligned32 ((UINT32 *)(DHCP6_OFFSET_OF_IA_NA_T2 (Option))));
//
// Refer to RFC3155 Chapter 22.4. If a client receives an IA_NA with T1 greater than T2,
// and both T1 and T2 are greater than 0, the client discards the IA_NA option and processes
// the remainder of the message as though the server had not included the invalid IA_NA option.
//
if ((T1 > T2) && (T2 > 0)) {
return EFI_DEVICE_ERROR;
}
}
//
// The format of the Status Code 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_STATUS_CODE | option-len |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | status-code | |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
// . .
// . status-message .
// . .
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
//
//
// sizeof (option-code + option-len) = 4
//
StsCode = Dhcp6StsSuccess;
Option = Dhcp6SeekOption (IaInnerOpt, IaInnerLen, Dhcp6OptStatusCode);
if (Option != NULL) {
StsCode = NTOHS (ReadUnaligned16 ((UINT16 *)(DHCP6_OFFSET_OF_STATUS_CODE (Option))));
if (StsCode != Dhcp6StsSuccess) {
return EFI_DEVICE_ERROR;
}
}
//
// Generate control block for the Ia.
//
Status = Dhcp6GenerateIaCb (
Instance,
IaInnerOpt,
IaInnerLen,
T1,
T2
);
return Status;
}
/**
Seeks the Inner Options from a DHCP6 Option
@param[in] IaType The type of the IA option.
@param[in] Option The pointer to the DHCP6 Option.
@param[in] OptionLen The length of the DHCP6 Option.
@param[out] IaInnerOpt The pointer to the IA inner option.
@param[out] IaInnerLen The length of the IA inner option.
@retval EFI_SUCCESS Seek the inner option successfully.
@retval EFI_DEVICE_ERROR The OptionLen is invalid. On Error,
the pointers are not modified
**/
EFI_STATUS
Dhcp6SeekInnerOptionSafe (
IN UINT16 IaType,
IN UINT8 *Option,
IN UINT32 OptionLen,
OUT UINT8 **IaInnerOpt,
OUT UINT16 *IaInnerLen
)
{
UINT16 IaInnerLenTmp;
UINT8 *IaInnerOptTmp;
if (Option == NULL) {
ASSERT (Option != NULL);
return EFI_DEVICE_ERROR;
}
if (IaInnerOpt == NULL) {
ASSERT (IaInnerOpt != NULL);
return EFI_DEVICE_ERROR;
}
if (IaInnerLen == NULL) {
ASSERT (IaInnerLen != NULL);
return EFI_DEVICE_ERROR;
}
if (IaType == Dhcp6OptIana) {
//
// Verify we have a fully formed IA_NA
//
if (OptionLen < DHCP6_MIN_SIZE_OF_IA_NA) {
return EFI_DEVICE_ERROR;
}
//
// Get the IA Inner Option and Length
//
IaInnerOptTmp = DHCP6_OFFSET_OF_IA_NA_INNER_OPT (Option);
//
// Verify the IaInnerLen is valid.
//
IaInnerLenTmp = (UINT16)NTOHS (ReadUnaligned16 ((UINT16 *)DHCP6_OFFSET_OF_OPT_LEN (Option)));
if (IaInnerLenTmp < DHCP6_SIZE_OF_COMBINED_IAID_T1_T2) {
return EFI_DEVICE_ERROR;
}
IaInnerLenTmp -= DHCP6_SIZE_OF_COMBINED_IAID_T1_T2;
} else if (IaType == Dhcp6OptIata) {
//
// Verify the OptionLen is valid.
//
if (OptionLen < DHCP6_MIN_SIZE_OF_IA_TA) {
return EFI_DEVICE_ERROR;
}
IaInnerOptTmp = DHCP6_OFFSET_OF_IA_TA_INNER_OPT (Option);
//
// Verify the IaInnerLen is valid.
//
IaInnerLenTmp = (UINT16)NTOHS (ReadUnaligned16 ((UINT16 *)(DHCP6_OFFSET_OF_OPT_LEN (Option))));
if (IaInnerLenTmp < DHCP6_SIZE_OF_IAID) {
return EFI_DEVICE_ERROR;
}
IaInnerLenTmp -= DHCP6_SIZE_OF_IAID;
} else {
return EFI_DEVICE_ERROR;
}
*IaInnerOpt = IaInnerOptTmp;
*IaInnerLen = IaInnerLenTmp;
return EFI_SUCCESS;
}
/**
Seek StatusCode Option in package. A Status Code option may appear in the
options field of a DHCP message and/or in the options field of another option.
See details in section 22.13, RFC3315.
@param[in] Instance The pointer to the Dhcp6 instance.
@param[in] Packet The pointer to reply messages.
@param[out] Option The pointer to status code option.
@retval EFI_SUCCESS Seek status code option successfully.
@retval EFI_DEVICE_ERROR An unexpected error.
**/
EFI_STATUS
Dhcp6SeekStsOption (
IN DHCP6_INSTANCE *Instance,
IN EFI_DHCP6_PACKET *Packet,
OUT UINT8 **Option
)
{
UINT8 *IaInnerOpt;
UINT16 IaInnerLen;
UINT16 StsCode;
UINT32 OptionLen;
// OptionLen is the length of the Options excluding the DHCP header.
// Length of the EFI_DHCP6_PACKET from the first byte of the Header field to the last
// byte of the Option[] field.
OptionLen = Packet->Length - sizeof (Packet->Dhcp6.Header);
//
// Seek StatusCode option directly in DHCP message body. That is, search in
// non-encapsulated option fields.
//
*Option = Dhcp6SeekOption (
Packet->Dhcp6.Option,
OptionLen,
Dhcp6OptStatusCode
);
if (*Option != NULL) {
StsCode = NTOHS (ReadUnaligned16 ((UINT16 *)(DHCP6_OFFSET_OF_STATUS_CODE (*Option))));
if (StsCode != Dhcp6StsSuccess) {
return EFI_DEVICE_ERROR;
}
}
//
// Seek in encapsulated options, IA_NA and IA_TA.
//
*Option = Dhcp6SeekIaOption (
Packet->Dhcp6.Option,
OptionLen,
&Instance->Config->IaDescriptor
);
if (*Option == NULL) {
return EFI_SUCCESS;
}
//
// Calculate the distance from Packet->Dhcp6.Option to the IA option.
//
// Packet->Size and Packet->Length are both UINT32 type, and Packet->Size is
// the size of the whole packet, including the DHCP header, and Packet->Length
// is the length of the DHCP message body, excluding the DHCP header.
//
// (*Option - Packet->Dhcp6.Option) is the number of bytes from the start of
// DHCP6 option area to the start of the IA option.
//
// Dhcp6SeekInnerOptionSafe() is searching starting from the start of the
// IA option to the end of the DHCP6 option area, thus subtract the space
// up until this option
//
OptionLen = OptionLen - (UINT32)(*Option - Packet->Dhcp6.Option);
//
// Seek the inner option
//
if (EFI_ERROR (
Dhcp6SeekInnerOptionSafe (
Instance->Config->IaDescriptor.Type,
*Option,
OptionLen,
&IaInnerOpt,
&IaInnerLen
)
))
{
return EFI_DEVICE_ERROR;
}
//
// The format of the Status Code 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_STATUS_CODE | option-len |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | status-code | |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
// . .
// . status-message .
// . .
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
//
//
// sizeof (option-code + option-len) = 4
//
*Option = Dhcp6SeekOption (IaInnerOpt, IaInnerLen, Dhcp6OptStatusCode);
if (*Option != NULL) {
StsCode = NTOHS (ReadUnaligned16 ((UINT16 *)((DHCP6_OFFSET_OF_STATUS_CODE (*Option)))));
if (StsCode != Dhcp6StsSuccess) {
return EFI_DEVICE_ERROR;
}
}
return EFI_SUCCESS;
}
/**
Transmit Dhcp6 message by udpio.
@param[in] Instance The pointer to the Dhcp6 instance.
@param[in] Packet The pointer to transmit message.
@param[in] Elapsed The pointer to the elapsed time value to fill in.
@retval EFI_SUCCESS Successfully transmitted the packet.
@retval EFI_OUT_OF_RESOURCES Required system resources could not be allocated.
@retval Others Failed to transmit the packet.
**/
EFI_STATUS
Dhcp6TransmitPacket (
IN DHCP6_INSTANCE *Instance,
IN EFI_DHCP6_PACKET *Packet,
IN UINT16 *Elapsed
)
{
EFI_STATUS Status;
NET_BUF *Wrap;
NET_FRAGMENT Frag;
UDP_END_POINT EndPt;
DHCP6_SERVICE *Service;
Service = Instance->Service;
//
// Wrap it into a netbuf then send it.
//
Frag.Bulk = (UINT8 *)&Packet->Dhcp6.Header;
Frag.Len = Packet->Length;
//
// Do not register free packet here, which will be handled in retry list.
//
Wrap = NetbufFromExt (&Frag, 1, 0, 0, Dhcp6DummyExtFree, NULL);
if (Wrap == NULL) {
return EFI_OUT_OF_RESOURCES;
}
//
// Multicast the Dhcp6 message, unless get the unicast server address by option.
//
ZeroMem (&EndPt, sizeof (UDP_END_POINT));
if (Instance->Unicast != NULL) {
CopyMem (
&EndPt.RemoteAddr,
Instance->Unicast,
sizeof (EFI_IPv6_ADDRESS)
);
} else {
CopyMem (
&EndPt.RemoteAddr,
&mAllDhcpRelayAndServersAddress,
sizeof (EFI_IPv6_ADDRESS)
);
}
EndPt.RemotePort = DHCP6_PORT_SERVER;
EndPt.LocalPort = DHCP6_PORT_CLIENT;
//
// Update the elapsed time value.
//
if (Elapsed != NULL) {
SetElapsedTime (Elapsed, Instance);
}
//
// Send out the message by the configured Udp6Io.
//
Status = UdpIoSendDatagram (
Service->UdpIo,
Wrap,
&EndPt,
NULL,
Dhcp6OnTransmitted,
NULL
);
if (EFI_ERROR (Status)) {
NetbufFree (Wrap);
return Status;
}
return EFI_SUCCESS;
}
/**
Create the solicit message and send it.
@param[in] Instance The pointer to the Dhcp6 instance.
@retval EFI_SUCCESS Created and sent the solicit message successfully.
@retval EFI_OUT_OF_RESOURCES Required system resources could not be allocated.
@retval Others Failed to send the solicit message.
**/
EFI_STATUS
Dhcp6SendSolicitMsg (
IN DHCP6_INSTANCE *Instance
)
{
EFI_STATUS Status;
EFI_DHCP6_PACKET *Packet;
EFI_DHCP6_PACKET_OPTION *UserOpt;
EFI_DHCP6_DUID *ClientId;
DHCP6_SERVICE *Service;
UINT8 *Cursor;
UINT16 *Elapsed;
UINT32 UserLen;
UINTN Index;
UINT16 Length;
Service = Instance->Service;
ClientId = Service->ClientId;
UserLen = 0;
ASSERT (Service->ClientId != NULL);
ASSERT (Instance->Config != NULL);
ASSERT (Instance->IaCb.Ia != NULL);
//
// Calculate the added length of customized option list.
//
for (Index = 0; Index < Instance->Config->OptionCount; Index++) {
UserLen += (NTOHS (Instance->Config->OptionList[Index]->OpLen) + 4);
}
//
// Create the Dhcp6 packet and initialize common fields.
//
Packet = AllocateZeroPool (DHCP6_BASE_PACKET_SIZE + UserLen);
if (Packet == NULL) {
Status = EFI_OUT_OF_RESOURCES;
goto ON_ERROR;
}
Packet->Size = DHCP6_BASE_PACKET_SIZE + UserLen;
Packet->Length = sizeof (EFI_DHCP6_HEADER);
Packet->Dhcp6.Header.MessageType = Dhcp6MsgSolicit;
Packet->Dhcp6.Header.TransactionId = Service->Xid++;
//
// Assembly Dhcp6 options for solicit message.
//
Cursor = Packet->Dhcp6.Option;
Length = HTONS (ClientId->Length);
Status = Dhcp6AppendOption (
Packet,
&Cursor,
HTONS (Dhcp6OptClientId),
Length,
ClientId->Duid
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
Status = Dhcp6AppendETOption (
Packet,
&Cursor,
Instance,
&Elapsed
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
Status = Dhcp6AppendIaOption (
Packet,
&Cursor,
Instance->IaCb.Ia,
Instance->IaCb.T1,
Instance->IaCb.T2,
Packet->Dhcp6.Header.MessageType
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
//
// Append user-defined when configurate Dhcp6 service.
//
for (Index = 0; Index < Instance->Config->OptionCount; Index++) {
UserOpt = Instance->Config->OptionList[Index];
Status = Dhcp6AppendOption (
Packet,
&Cursor,
UserOpt->OpCode,
UserOpt->OpLen,
UserOpt->Data
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
}
ASSERT (Packet->Size > Packet->Length + 8);
//
// Callback to user with the packet to be sent and check the user's feedback.
//
Status = Dhcp6CallbackUser (Instance, Dhcp6SendSolicit, &Packet);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
//
// Send solicit packet with the state transition from Dhcp6init to
// Dhcp6selecting.
//
Instance->IaCb.Ia->State = Dhcp6Selecting;
//
// Clear initial time for current transaction.
//
Instance->StartTime = 0;
Status = Dhcp6TransmitPacket (Instance, Packet, Elapsed);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
//
// Enqueue the sent packet for the retransmission in case reply timeout.
//
return Dhcp6EnqueueRetry (
Instance,
Packet,
Elapsed,
Instance->Config->SolicitRetransmission
);
ON_ERROR:
if (Packet) {
FreePool (Packet);
}
return Status;
}
/**
Configure some parameter to initiate SolicitMsg.
@param[in] Instance The pointer to the Dhcp6 instance.
@retval EFI_SUCCESS Created and sent the solicit message successfully.
@retval EFI_OUT_OF_RESOURCES Required system resources could not be allocated.
@retval Others Failed to send the solicit message.
**/
EFI_STATUS
Dhcp6InitSolicitMsg (
IN DHCP6_INSTANCE *Instance
)
{
Instance->IaCb.T1 = 0;
Instance->IaCb.T2 = 0;
Instance->IaCb.Ia->IaAddressCount = 0;
return Dhcp6SendSolicitMsg (Instance);
}
/**
Create the request message and send it.
@param[in] Instance The pointer to the Dhcp6 instance.
@retval EFI_SUCCESS Created and sent the request message successfully.
@retval EFI_OUT_OF_RESOURCES Required system resources could not be allocated.
@retval EFI_DEVICE_ERROR An unexpected error.
@retval Others Failed to send the request message.
**/
EFI_STATUS
Dhcp6SendRequestMsg (
IN DHCP6_INSTANCE *Instance
)
{
EFI_STATUS Status;
EFI_DHCP6_PACKET *Packet;
EFI_DHCP6_PACKET_OPTION *UserOpt;
EFI_DHCP6_DUID *ClientId;
EFI_DHCP6_DUID *ServerId;
DHCP6_SERVICE *Service;
UINT8 *Option;
UINT8 *Cursor;
UINT16 *Elapsed;
UINT32 UserLen;
UINTN Index;
UINT16 Length;
ASSERT (Instance->AdSelect != NULL);
ASSERT (Instance->Config != NULL);
ASSERT (Instance->IaCb.Ia != NULL);
ASSERT (Instance->Service != NULL);
Service = Instance->Service;
ClientId = Service->ClientId;
ASSERT (ClientId != NULL);
//
// Get the server Id from the selected advertisement message.
//
Option = Dhcp6SeekOption (
Instance->AdSelect->Dhcp6.Option,
Instance->AdSelect->Length - sizeof (EFI_DHCP6_HEADER),
Dhcp6OptServerId
);
if (Option == NULL) {
return EFI_DEVICE_ERROR;
}
ServerId = (EFI_DHCP6_DUID *)(Option + 2);
//
// Calculate the added length of customized option list.
//
UserLen = 0;
for (Index = 0; Index < Instance->Config->OptionCount; Index++) {
UserLen += (NTOHS (Instance->Config->OptionList[Index]->OpLen) + 4);
}
//
// Create the Dhcp6 packet and initialize common fields.
//
Packet = AllocateZeroPool (DHCP6_BASE_PACKET_SIZE + UserLen);
if (Packet == NULL) {
Status = EFI_OUT_OF_RESOURCES;
goto ON_ERROR;
}
Packet->Size = DHCP6_BASE_PACKET_SIZE + UserLen;
Packet->Length = sizeof (EFI_DHCP6_HEADER);
Packet->Dhcp6.Header.MessageType = Dhcp6MsgRequest;
Packet->Dhcp6.Header.TransactionId = Service->Xid++;
//
// Assembly Dhcp6 options for request message.
//
Cursor = Packet->Dhcp6.Option;
Length = HTONS (ClientId->Length);
Status = Dhcp6AppendOption (
Packet,
&Cursor,
HTONS (Dhcp6OptClientId),
Length,
ClientId->Duid
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
Status = Dhcp6AppendETOption (
Packet,
&Cursor,
Instance,
&Elapsed
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
Status = Dhcp6AppendOption (
Packet,
&Cursor,
HTONS (Dhcp6OptServerId),
ServerId->Length,
ServerId->Duid
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
Status = Dhcp6AppendIaOption (
Packet,
&Cursor,
Instance->IaCb.Ia,
Instance->IaCb.T1,
Instance->IaCb.T2,
Packet->Dhcp6.Header.MessageType
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
//
// Append user-defined when configurate Dhcp6 service.
//
for (Index = 0; Index < Instance->Config->OptionCount; Index++) {
UserOpt = Instance->Config->OptionList[Index];
Status = Dhcp6AppendOption (
Packet,
&Cursor,
UserOpt->OpCode,
UserOpt->OpLen,
UserOpt->Data
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
}
ASSERT (Packet->Size > Packet->Length + 8);
//
// Callback to user with the packet to be sent and check the user's feedback.
//
Status = Dhcp6CallbackUser (Instance, Dhcp6SendRequest, &Packet);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
//
// Send request packet with the state transition from Dhcp6selecting to
// Dhcp6requesting.
//
Instance->IaCb.Ia->State = Dhcp6Requesting;
//
// Clear initial time for current transaction.
//
Instance->StartTime = 0;
Status = Dhcp6TransmitPacket (Instance, Packet, Elapsed);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
//
// Enqueue the sent packet for the retransmission in case reply timeout.
//
return Dhcp6EnqueueRetry (Instance, Packet, Elapsed, NULL);
ON_ERROR:
if (Packet) {
FreePool (Packet);
}
return Status;
}
/**
Create the decline message and send it.
@param[in] Instance The pointer to the Dhcp6 instance.
@param[in] DecIa The pointer to the decline Ia.
@retval EFI_SUCCESS Created and sent the decline message successfully.
@retval EFI_OUT_OF_RESOURCES Required system resources could not be allocated.
@retval EFI_DEVICE_ERROR An unexpected error.
@retval Others Failed to send the decline message.
**/
EFI_STATUS
Dhcp6SendDeclineMsg (
IN DHCP6_INSTANCE *Instance,
IN EFI_DHCP6_IA *DecIa
)
{
EFI_STATUS Status;
EFI_DHCP6_PACKET *Packet;
EFI_DHCP6_PACKET *LastReply;
EFI_DHCP6_DUID *ClientId;
EFI_DHCP6_DUID *ServerId;
DHCP6_SERVICE *Service;
UINT8 *Option;
UINT8 *Cursor;
UINT16 *Elapsed;
UINT16 Length;
ASSERT (Instance->Config != NULL);
ASSERT (Instance->IaCb.Ia != NULL);
ASSERT (Instance->Service != NULL);
Service = Instance->Service;
ClientId = Service->ClientId;
LastReply = Instance->IaCb.Ia->ReplyPacket;
ASSERT (ClientId != NULL);
ASSERT (LastReply != NULL);
//
// Get the server Id from the last reply message.
//
Option = Dhcp6SeekOption (
LastReply->Dhcp6.Option,
LastReply->Length - sizeof (EFI_DHCP6_HEADER),
Dhcp6OptServerId
);
if (Option == NULL) {
return EFI_DEVICE_ERROR;
}
//
// EFI_DHCP6_DUID contains a length field of 2 bytes.
//
ServerId = (EFI_DHCP6_DUID *)(Option + 2);
//
// Create the Dhcp6 packet and initialize common fields.
//
Packet = AllocateZeroPool (DHCP6_BASE_PACKET_SIZE);
if (Packet == NULL) {
Status = EFI_OUT_OF_RESOURCES;
goto ON_ERROR;
}
Packet->Size = DHCP6_BASE_PACKET_SIZE;
Packet->Length = sizeof (EFI_DHCP6_HEADER);
Packet->Dhcp6.Header.MessageType = Dhcp6MsgDecline;
Packet->Dhcp6.Header.TransactionId = Service->Xid++;
//
// Assembly Dhcp6 options for rebind/renew message.
//
Cursor = Packet->Dhcp6.Option;
Length = HTONS (ClientId->Length);
Status = Dhcp6AppendOption (
Packet,
&Cursor,
HTONS (Dhcp6OptClientId),
Length,
ClientId->Duid
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
Status = Dhcp6AppendETOption (
Packet,
&Cursor,
Instance,
&Elapsed
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
Status = Dhcp6AppendOption (
Packet,
&Cursor,
HTONS (Dhcp6OptServerId),
ServerId->Length,
ServerId->Duid
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
Status = Dhcp6AppendIaOption (
Packet,
&Cursor,
DecIa,
0,
0,
Packet->Dhcp6.Header.MessageType
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
ASSERT (Packet->Size > Packet->Length + 8);
//
// Callback to user with the packet to be sent and check the user's feedback.
//
Status = Dhcp6CallbackUser (Instance, Dhcp6SendDecline, &Packet);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
//
// Send decline packet with the state transition from Dhcp6bound to
// Dhcp6declining.
//
Instance->IaCb.Ia->State = Dhcp6Declining;
//
// Clear initial time for current transaction.
//
Instance->StartTime = 0;
Status = Dhcp6TransmitPacket (Instance, Packet, Elapsed);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
//
// Enqueue the sent packet for the retransmission in case reply timeout.
//
return Dhcp6EnqueueRetry (Instance, Packet, Elapsed, NULL);
ON_ERROR:
if (Packet) {
FreePool (Packet);
}
return Status;
}
/**
Create the release message and send it.
@param[in] Instance The pointer to the Dhcp6 instance.
@param[in] RelIa The pointer to the release Ia.
@retval EFI_SUCCESS Created and sent the release message successfully.
@retval EFI_OUT_OF_RESOURCES Required system resources could not be allocated.
@retval EFI_DEVICE_ERROR An unexpected error.
@retval Others Failed to send the release message.
**/
EFI_STATUS
Dhcp6SendReleaseMsg (
IN DHCP6_INSTANCE *Instance,
IN EFI_DHCP6_IA *RelIa
)
{
EFI_STATUS Status;
EFI_DHCP6_PACKET *Packet;
EFI_DHCP6_PACKET *LastReply;
EFI_DHCP6_DUID *ClientId;
EFI_DHCP6_DUID *ServerId;
DHCP6_SERVICE *Service;
UINT8 *Option;
UINT8 *Cursor;
UINT16 *Elapsed;
UINT16 Length;
ASSERT (Instance->Config);
ASSERT (Instance->IaCb.Ia);
Service = Instance->Service;
ClientId = Service->ClientId;
LastReply = Instance->IaCb.Ia->ReplyPacket;
ASSERT (ClientId);
ASSERT (LastReply);
//
// Get the server Id from the last reply message.
//
Option = Dhcp6SeekOption (
LastReply->Dhcp6.Option,
LastReply->Length - sizeof (EFI_DHCP6_HEADER),
Dhcp6OptServerId
);
if (Option == NULL) {
return EFI_DEVICE_ERROR;
}
ServerId = (EFI_DHCP6_DUID *)(Option + 2);
//
// Create the Dhcp6 packet and initialize common fields.
//
Packet = AllocateZeroPool (DHCP6_BASE_PACKET_SIZE);
if (Packet == NULL) {
Status = EFI_OUT_OF_RESOURCES;
goto ON_ERROR;
}
Packet->Size = DHCP6_BASE_PACKET_SIZE;
Packet->Length = sizeof (EFI_DHCP6_HEADER);
Packet->Dhcp6.Header.MessageType = Dhcp6MsgRelease;
Packet->Dhcp6.Header.TransactionId = Service->Xid++;
//
// Assembly Dhcp6 options for rebind/renew message
//
Cursor = Packet->Dhcp6.Option;
Length = HTONS (ClientId->Length);
Status = Dhcp6AppendOption (
Packet,
&Cursor,
HTONS (Dhcp6OptClientId),
Length,
ClientId->Duid
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
//
// ServerId is extracted from packet, it's network order.
//
Status = Dhcp6AppendOption (
Packet,
&Cursor,
HTONS (Dhcp6OptServerId),
ServerId->Length,
ServerId->Duid
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
Status = Dhcp6AppendETOption (
Packet,
&Cursor,
Instance,
&Elapsed
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
Status = Dhcp6AppendIaOption (
Packet,
&Cursor,
RelIa,
0,
0,
Packet->Dhcp6.Header.MessageType
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
ASSERT (Packet->Size > Packet->Length + 8);
//
// Callback to user with the packet to be sent and check the user's feedback.
//
Status = Dhcp6CallbackUser (Instance, Dhcp6SendRelease, &Packet);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
//
// Send release packet with the state transition from Dhcp6bound to
// Dhcp6releasing.
//
Instance->IaCb.Ia->State = Dhcp6Releasing;
Status = Dhcp6TransmitPacket (Instance, Packet, Elapsed);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
//
// Enqueue the sent packet for the retransmission in case reply timeout.
//
return Dhcp6EnqueueRetry (Instance, Packet, Elapsed, NULL);
ON_ERROR:
if (Packet) {
FreePool (Packet);
}
return Status;
}
/**
Create the renew/rebind message and send it.
@param[in] Instance The pointer to the Dhcp6 instance.
@param[in] RebindRequest If TRUE, it is a Rebind type message.
Otherwise, it is a Renew type message.
@retval EFI_SUCCESS Created and sent the renew/rebind message successfully.
@retval EFI_OUT_OF_RESOURCES Required system resources could not be allocated.
@retval EFI_DEVICE_ERROR An unexpected error.
@retval Others Failed to send the renew/rebind message.
**/
EFI_STATUS
Dhcp6SendRenewRebindMsg (
IN DHCP6_INSTANCE *Instance,
IN BOOLEAN RebindRequest
)
{
EFI_STATUS Status;
EFI_DHCP6_PACKET *Packet;
EFI_DHCP6_PACKET *LastReply;
EFI_DHCP6_PACKET_OPTION *UserOpt;
EFI_DHCP6_DUID *ClientId;
EFI_DHCP6_DUID *ServerId;
EFI_DHCP6_STATE State;
EFI_DHCP6_EVENT Event;
DHCP6_SERVICE *Service;
UINT8 *Option;
UINT8 *Cursor;
UINT16 *Elapsed;
UINT32 UserLen;
UINTN Index;
UINT16 Length;
ASSERT (Instance->Config);
ASSERT (Instance->IaCb.Ia);
Service = Instance->Service;
ClientId = Service->ClientId;
ASSERT (ClientId);
//
// Calculate the added length of customized option list.
//
UserLen = 0;
for (Index = 0; Index < Instance->Config->OptionCount; Index++) {
UserLen += (NTOHS (Instance->Config->OptionList[Index]->OpLen) + 4);
}
//
// Create the Dhcp6 packet and initialize common fields.
//
Packet = AllocateZeroPool (DHCP6_BASE_PACKET_SIZE + UserLen);
if (Packet == NULL) {
Status = EFI_OUT_OF_RESOURCES;
goto ON_ERROR;
}
Packet->Size = DHCP6_BASE_PACKET_SIZE + UserLen;
Packet->Length = sizeof (EFI_DHCP6_HEADER);
Packet->Dhcp6.Header.MessageType = RebindRequest ? Dhcp6MsgRebind : Dhcp6MsgRenew;
Packet->Dhcp6.Header.TransactionId = Service->Xid++;
//
// Assembly Dhcp6 options for rebind/renew message.
//
Cursor = Packet->Dhcp6.Option;
Length = HTONS (ClientId->Length);
Status = Dhcp6AppendOption (
Packet,
&Cursor,
HTONS (Dhcp6OptClientId),
Length,
ClientId->Duid
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
Status = Dhcp6AppendETOption (
Packet,
&Cursor,
Instance,
&Elapsed
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
Status = Dhcp6AppendIaOption (
Packet,
&Cursor,
Instance->IaCb.Ia,
Instance->IaCb.T1,
Instance->IaCb.T2,
Packet->Dhcp6.Header.MessageType
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
if (!RebindRequest) {
//
// Get the server Id from the last reply message and
// insert it for rebind request.
//
LastReply = Instance->IaCb.Ia->ReplyPacket;
ASSERT (LastReply);
Option = Dhcp6SeekOption (
LastReply->Dhcp6.Option,
LastReply->Length - sizeof (EFI_DHCP6_HEADER),
Dhcp6OptServerId
);
if (Option == NULL) {
Status = EFI_DEVICE_ERROR;
goto ON_ERROR;
}
ServerId = (EFI_DHCP6_DUID *)(Option + 2);
Status = Dhcp6AppendOption (
Packet,
&Cursor,
HTONS (Dhcp6OptServerId),
ServerId->Length,
ServerId->Duid
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
}
//
// Append user-defined when configurate Dhcp6 service.
//
for (Index = 0; Index < Instance->Config->OptionCount; Index++) {
UserOpt = Instance->Config->OptionList[Index];
Status = Dhcp6AppendOption (
Packet,
&Cursor,
UserOpt->OpCode,
UserOpt->OpLen,
UserOpt->Data
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
}
ASSERT (Packet->Size > Packet->Length + 8);
//
// Callback to user with the packet to be sent and check the user's feedback.
//
State = (RebindRequest) ? Dhcp6Rebinding : Dhcp6Renewing;
Event = (RebindRequest) ? Dhcp6EnterRebinding : Dhcp6EnterRenewing;
Status = Dhcp6CallbackUser (Instance, Event, &Packet);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
//
// Send renew/rebind packet with the state transition from Dhcp6bound to
// Dhcp6renew/rebind.
// And sync the lease time when send renew/rebind, in case that user send
// renew/rebind actively.
//
Instance->IaCb.Ia->State = State;
Instance->IaCb.LeaseTime = (RebindRequest) ? Instance->IaCb.T2 : Instance->IaCb.T1;
//
// Clear initial time for current transaction.
//
Instance->StartTime = 0;
Status = Dhcp6TransmitPacket (Instance, Packet, Elapsed);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
//
// Enqueue the sent packet for the retransmission in case reply timeout.
//
return Dhcp6EnqueueRetry (Instance, Packet, Elapsed, NULL);
ON_ERROR:
if (Packet) {
FreePool (Packet);
}
return Status;
}
/**
Start the information request process.
@param[in] Instance The pointer to the Dhcp6 instance.
@param[in] SendClientId If TRUE, the client identifier option will be included in
information request message. Otherwise, the client identifier
option will not be included.
@param[in] OptionRequest The pointer to the option request option.
@param[in] OptionCount The number options in the OptionList.
@param[in] OptionList The array pointers to the appended options.
@param[in] Retransmission The pointer to the retransmission control.
@param[in] TimeoutEvent The event of timeout.
@param[in] ReplyCallback The callback function when the reply was received.
@param[in] CallbackContext The pointer to the parameter passed to the callback.
@retval EFI_SUCCESS Start the info-request process successfully.
@retval EFI_OUT_OF_RESOURCES Required system resources could not be allocated.
@retval EFI_NO_MAPPING No source address is available for use.
@retval Others Failed to start the info-request process.
**/
EFI_STATUS
Dhcp6StartInfoRequest (
IN DHCP6_INSTANCE *Instance,
IN BOOLEAN SendClientId,
IN EFI_DHCP6_PACKET_OPTION *OptionRequest,
IN UINT32 OptionCount,
IN EFI_DHCP6_PACKET_OPTION *OptionList[] OPTIONAL,
IN EFI_DHCP6_RETRANSMISSION *Retransmission,
IN EFI_EVENT TimeoutEvent OPTIONAL,
IN EFI_DHCP6_INFO_CALLBACK ReplyCallback,
IN VOID *CallbackContext OPTIONAL
)
{
EFI_STATUS Status;
DHCP6_INF_CB *InfCb;
DHCP6_SERVICE *Service;
EFI_TPL OldTpl;
Service = Instance->Service;
OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
Instance->UdpSts = EFI_ALREADY_STARTED;
//
// Create and initialize the control block for the info-request.
//
InfCb = AllocateZeroPool (sizeof (DHCP6_INF_CB));
if (InfCb == NULL) {
gBS->RestoreTPL (OldTpl);
return EFI_OUT_OF_RESOURCES;
}
InfCb->ReplyCallback = ReplyCallback;
InfCb->CallbackContext = CallbackContext;
InfCb->TimeoutEvent = TimeoutEvent;
InsertTailList (&Instance->InfList, &InfCb->Link);
//
// Send the info-request message to start exchange process.
//
Status = Dhcp6SendInfoRequestMsg (
Instance,
InfCb,
SendClientId,
OptionRequest,
OptionCount,
OptionList,
Retransmission
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
//
// Register receive callback for the stateless exchange process.
//
Status = UdpIoRecvDatagram (
Service->UdpIo,
Dhcp6ReceivePacket,
Service,
0
);
if (EFI_ERROR (Status) && (Status != EFI_ALREADY_STARTED)) {
goto ON_ERROR;
}
gBS->RestoreTPL (OldTpl);
return EFI_SUCCESS;
ON_ERROR:
gBS->RestoreTPL (OldTpl);
RemoveEntryList (&InfCb->Link);
FreePool (InfCb);
return Status;
}
/**
Create the information request message and send it.
@param[in] Instance The pointer to the Dhcp6 instance.
@param[in] InfCb The pointer to the information request control block.
@param[in] SendClientId If TRUE, the client identifier option will be included in
information request message. Otherwise, the client identifier
option will not be included.
@param[in] OptionRequest The pointer to the option request option.
@param[in] OptionCount The number options in the OptionList.
@param[in] OptionList The array pointers to the appended options.
@param[in] Retransmission The pointer to the retransmission control.
@retval EFI_SUCCESS Created and sent the info-request message successfully.
@retval EFI_OUT_OF_RESOURCES Required system resources could not be allocated.
@retval Others Failed to send the info-request message.
**/
EFI_STATUS
Dhcp6SendInfoRequestMsg (
IN DHCP6_INSTANCE *Instance,
IN DHCP6_INF_CB *InfCb,
IN BOOLEAN SendClientId,
IN EFI_DHCP6_PACKET_OPTION *OptionRequest,
IN UINT32 OptionCount,
IN EFI_DHCP6_PACKET_OPTION *OptionList[],
IN EFI_DHCP6_RETRANSMISSION *Retransmission
)
{
EFI_STATUS Status;
EFI_DHCP6_PACKET *Packet;
EFI_DHCP6_PACKET_OPTION *UserOpt;
EFI_DHCP6_DUID *ClientId;
DHCP6_SERVICE *Service;
UINT8 *Cursor;
UINT16 *Elapsed;
UINT32 UserLen;
UINTN Index;
UINT16 Length;
ASSERT (OptionRequest);
Service = Instance->Service;
ClientId = Service->ClientId;
UserLen = NTOHS (OptionRequest->OpLen) + 4;
ASSERT (ClientId);
//
// Calculate the added length of customized option list.
//
for (Index = 0; Index < OptionCount; Index++) {
UserLen += (NTOHS (OptionList[Index]->OpLen) + 4);
}
//
// Create the Dhcp6 packet and initialize common fields.
//
Packet = AllocateZeroPool (DHCP6_BASE_PACKET_SIZE + UserLen);
if (Packet == NULL) {
Status = EFI_OUT_OF_RESOURCES;
goto ON_ERROR;
}
Packet->Size = DHCP6_BASE_PACKET_SIZE + UserLen;
Packet->Length = sizeof (EFI_DHCP6_HEADER);
Packet->Dhcp6.Header.MessageType = Dhcp6MsgInfoRequest;
Packet->Dhcp6.Header.TransactionId = Service->Xid++;
InfCb->Xid = Packet->Dhcp6.Header.TransactionId;
//
// Assembly Dhcp6 options for info-request message.
//
Cursor = Packet->Dhcp6.Option;
if (SendClientId) {
Length = HTONS (ClientId->Length);
Status = Dhcp6AppendOption (
Packet,
&Cursor,
HTONS (Dhcp6OptClientId),
Length,
ClientId->Duid
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
}
Status = Dhcp6AppendETOption (
Packet,
&Cursor,
Instance,
&Elapsed
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
Status = Dhcp6AppendOption (
Packet,
&Cursor,
OptionRequest->OpCode,
OptionRequest->OpLen,
OptionRequest->Data
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
//
// Append user-defined when configurate Dhcp6 service.
//
for (Index = 0; Index < OptionCount; Index++) {
UserOpt = OptionList[Index];
Status = Dhcp6AppendOption (
Packet,
&Cursor,
UserOpt->OpCode,
UserOpt->OpLen,
UserOpt->Data
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
}
ASSERT (Packet->Size > Packet->Length + 8);
//
// Clear initial time for current transaction.
//
Instance->StartTime = 0;
//
// Send info-request packet with no state.
//
Status = Dhcp6TransmitPacket (Instance, Packet, Elapsed);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
//
// Enqueue the sent packet for the retransmission in case reply timeout.
//
return Dhcp6EnqueueRetry (Instance, Packet, Elapsed, Retransmission);
ON_ERROR:
if (Packet) {
FreePool (Packet);
}
return Status;
}
/**
Create the Confirm message and send it.
@param[in] Instance The pointer to the Dhcp6 instance.
@retval EFI_SUCCESS Created and sent the confirm message successfully.
@retval EFI_OUT_OF_RESOURCES Required system resources could not be allocated.
@retval EFI_DEVICE_ERROR An unexpected error.
@retval Others Failed to send the confirm message.
**/
EFI_STATUS
Dhcp6SendConfirmMsg (
IN DHCP6_INSTANCE *Instance
)
{
UINT8 *Cursor;
UINTN Index;
UINT16 Length;
UINT32 UserLen;
EFI_STATUS Status;
DHCP6_SERVICE *Service;
EFI_DHCP6_DUID *ClientId;
EFI_DHCP6_PACKET *Packet;
EFI_DHCP6_PACKET_OPTION *UserOpt;
UINT16 *Elapsed;
ASSERT (Instance->Config != NULL);
ASSERT (Instance->IaCb.Ia != NULL);
ASSERT (Instance->Service != NULL);
Service = Instance->Service;
ClientId = Service->ClientId;
ASSERT (ClientId != NULL);
//
// Calculate the added length of customized option list.
//
UserLen = 0;
for (Index = 0; Index < Instance->Config->OptionCount; Index++) {
UserLen += (NTOHS (Instance->Config->OptionList[Index]->OpLen) + 4);
}
//
// Create the Dhcp6 packet and initialize common fields.
//
Packet = AllocateZeroPool (DHCP6_BASE_PACKET_SIZE + UserLen);
if (Packet == NULL) {
Status = EFI_OUT_OF_RESOURCES;
goto ON_ERROR;
}
Packet->Size = DHCP6_BASE_PACKET_SIZE + UserLen;
Packet->Length = sizeof (EFI_DHCP6_HEADER);
Packet->Dhcp6.Header.MessageType = Dhcp6MsgConfirm;
Packet->Dhcp6.Header.TransactionId = Service->Xid++;
//
// Assembly Dhcp6 options for solicit message.
//
Cursor = Packet->Dhcp6.Option;
Length = HTONS (ClientId->Length);
Status = Dhcp6AppendOption (
Packet,
&Cursor,
HTONS (Dhcp6OptClientId),
Length,
ClientId->Duid
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
Status = Dhcp6AppendETOption (
Packet,
&Cursor,
Instance,
&Elapsed
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
Status = Dhcp6AppendIaOption (
Packet,
&Cursor,
Instance->IaCb.Ia,
Instance->IaCb.T1,
Instance->IaCb.T2,
Packet->Dhcp6.Header.MessageType
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
//
// Append user-defined when configurate Dhcp6 service.
//
for (Index = 0; Index < Instance->Config->OptionCount; Index++) {
UserOpt = Instance->Config->OptionList[Index];
Status = Dhcp6AppendOption (
Packet,
&Cursor,
UserOpt->OpCode,
UserOpt->OpLen,
UserOpt->Data
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
}
ASSERT (Packet->Size > Packet->Length + 8);
//
// Callback to user with the packet to be sent and check the user's feedback.
//
Status = Dhcp6CallbackUser (Instance, Dhcp6SendConfirm, &Packet);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
//
// Send confirm packet with the state transition from Dhcp6Bound to
// Dhcp6Confirming.
//
Instance->IaCb.Ia->State = Dhcp6Confirming;
//
// Clear initial time for current transaction.
//
Instance->StartTime = 0;
Status = Dhcp6TransmitPacket (Instance, Packet, Elapsed);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
//
// Enqueue the sent packet for the retransmission in case reply timeout.
//
return Dhcp6EnqueueRetry (Instance, Packet, Elapsed, NULL);
ON_ERROR:
if (Packet) {
FreePool (Packet);
}
return Status;
}
/**
Handle with the Dhcp6 reply message.
@param[in] Instance The pointer to Dhcp6 instance.
@param[in] Packet The pointer to the Dhcp6 reply message.
@retval EFI_SUCCESS Processed the reply message successfully.
@retval EFI_OUT_OF_RESOURCES Required system resources could not be allocated.
@retval EFI_DEVICE_ERROR An unexpected error.
@retval Others Failed to process the reply message.
**/
EFI_STATUS
Dhcp6HandleReplyMsg (
IN DHCP6_INSTANCE *Instance,
IN EFI_DHCP6_PACKET *Packet
)
{
EFI_STATUS Status;
UINT8 *Option;
UINT16 StsCode;
ASSERT (Instance->Config != NULL);
ASSERT (Instance->IaCb.Ia != NULL);
ASSERT (Packet != NULL);
Status = EFI_SUCCESS;
if (Packet->Dhcp6.Header.MessageType != Dhcp6MsgReply) {
return EFI_DEVICE_ERROR;
}
//
// If the client subsequently receives a valid reply message that includes a
// rapid commit option since send a solicit with rapid commit option before,
// preocess the reply message and discard any reply messages received in
// response to the request message.
// See details in the section-17.1.4 of rfc-3315.
//
Option = Dhcp6SeekOption (
Packet->Dhcp6.Option,
Packet->Length - sizeof (EFI_DHCP6_HEADER),
Dhcp6OptRapidCommit
);
if (((Option != NULL) && !Instance->Config->RapidCommit) || ((Option == NULL) && Instance->Config->RapidCommit)) {
return EFI_DEVICE_ERROR;
}
//
// As to a valid reply packet in response to a request/renew/rebind packet,
// ignore the packet if not contains the Ia option
//
if ((Instance->IaCb.Ia->State == Dhcp6Requesting) ||
(Instance->IaCb.Ia->State == Dhcp6Renewing) ||
(Instance->IaCb.Ia->State == Dhcp6Rebinding)
)
{
Option = Dhcp6SeekIaOption (
Packet->Dhcp6.Option,
Packet->Length,
&Instance->Config->IaDescriptor
);
if (Option == NULL) {
return EFI_SUCCESS;
}
}
//
// Callback to user with the received packet and check the user's feedback.
//
Status = Dhcp6CallbackUser (Instance, Dhcp6RcvdReply, &Packet);
if (EFI_ERROR (Status)) {
return Status;
}
//
// When receive a valid reply packet in response to a decline/release packet,
// the client considers the decline/release event completed regardless of the
// status code.
//
if ((Instance->IaCb.Ia->State == Dhcp6Declining) || (Instance->IaCb.Ia->State == Dhcp6Releasing)) {
if (Instance->IaCb.Ia->IaAddressCount != 0) {
Instance->IaCb.Ia->State = Dhcp6Bound;
} else {
ASSERT (Instance->IaCb.Ia->ReplyPacket);
FreePool (Instance->IaCb.Ia->ReplyPacket);
Instance->IaCb.Ia->ReplyPacket = NULL;
Instance->IaCb.Ia->State = Dhcp6Init;
}
//
// For sync, set the success flag out of polling in decline/release.
//
Instance->UdpSts = EFI_SUCCESS;
//
// For async, signal the Ia event to inform Ia information update.
//
if (Instance->Config->IaInfoEvent != NULL) {
gBS->SignalEvent (Instance->Config->IaInfoEvent);
}
//
// Reset start time for next exchange.
//
Instance->StartTime = 0;
Status = EFI_SUCCESS;
goto ON_EXIT;
}
//
// Upon the receipt of a valid reply packet in response to a solicit, request,
// confirm, renew and rebind, the behavior depends on the status code option.
// See the details in the section-18.1.8 of rfc-3315.
//
Option = NULL;
Status = Dhcp6SeekStsOption (
Instance,
Packet,
&Option
);
if (!EFI_ERROR (Status)) {
//
// No status code or no error status code means succeed to reply.
//
Status = Dhcp6UpdateIaInfo (Instance, Packet);
if (!EFI_ERROR (Status)) {
//
// Reset start time for next exchange.
//
Instance->StartTime = 0;
//
// Set bound state and store the reply packet.
//
if (Instance->IaCb.Ia->ReplyPacket != NULL) {
FreePool (Instance->IaCb.Ia->ReplyPacket);
}
Instance->IaCb.Ia->ReplyPacket = AllocateZeroPool (Packet->Size);
if (Instance->IaCb.Ia->ReplyPacket == NULL) {
Status = EFI_OUT_OF_RESOURCES;
goto ON_EXIT;
}
CopyMem (Instance->IaCb.Ia->ReplyPacket, Packet, Packet->Size);
Instance->IaCb.Ia->State = Dhcp6Bound;
//
// For sync, set the success flag out of polling in start/renewrebind.
//
Instance->UdpSts = EFI_SUCCESS;
//
// Maybe this is a new round DHCP process due to some reason, such as NotOnLink
// ReplyMsg for ConfirmMsg should trigger new round to acquire new address. In that
// case, clear old address.ValidLifetime and append to new address. Therefore, DHCP
// consumers can be notified to flush old address.
//
Dhcp6AppendCacheIa (Instance);
//
// For async, signal the Ia event to inform Ia information update.
//
if (Instance->Config->IaInfoEvent != NULL) {
gBS->SignalEvent (Instance->Config->IaInfoEvent);
}
} else if (Status == EFI_NOT_FOUND) {
//
// Refer to RFC3315 Chapter 18.1.8, for each IA in the original Renew or Rebind message,
// the client sends a Renew or Rebind if the IA is not in the Reply message.
// Return EFI_SUCCESS so we can continue to restart the Renew/Rebind process.
//
return EFI_SUCCESS;
}
goto ON_EXIT;
} else if (Option != NULL) {
//
// Any error status code option is found.
//
StsCode = NTOHS (ReadUnaligned16 ((UINT16 *)((DHCP6_OFFSET_OF_STATUS_CODE (Option)))));
switch (StsCode) {
case Dhcp6StsUnspecFail:
//
// It indicates the server is unable to process the message due to an
// unspecified failure condition, so just retry if possible.
//
break;
case Dhcp6StsUseMulticast:
//
// It indicates the server receives a message via unicast from a client
// to which the server has not sent a unicast option, so retry it by
// multi-cast address.
//
if (Instance->Unicast != NULL) {
FreePool (Instance->Unicast);
Instance->Unicast = NULL;
}
break;
case Dhcp6StsNotOnLink:
if (Instance->IaCb.Ia->State == Dhcp6Confirming) {
//
// Before initiate new round DHCP, cache the current IA.
//
Status = Dhcp6CacheIa (Instance);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Restart S.A.R.R process to acquire new address.
//
Status = Dhcp6InitSolicitMsg (Instance);
if (EFI_ERROR (Status)) {
return Status;
}
}
break;
case Dhcp6StsNoBinding:
if ((Instance->IaCb.Ia->State == Dhcp6Renewing) || (Instance->IaCb.Ia->State == Dhcp6Rebinding)) {
//
// Refer to RFC3315 Chapter 18.1.8, for each IA in the original Renew or Rebind message, the client
// sends a Request message if the IA contained a Status Code option with the NoBinding status.
//
Status = Dhcp6SendRequestMsg (Instance);
if (EFI_ERROR (Status)) {
return Status;
}
}
break;
default:
//
// The other status code, just restart solicitation.
//
break;
}
}
return EFI_SUCCESS;
ON_EXIT:
if (!EFI_ERROR (Status)) {
Status = Dhcp6DequeueRetry (
Instance,
Packet->Dhcp6.Header.TransactionId,
FALSE
);
}
return Status;
}
/**
Select the appointed Dhcp6 advertisement message.
@param[in] Instance The pointer to the Dhcp6 instance.
@param[in] AdSelect The pointer to the selected Dhcp6 advertisement message.
@retval EFI_SUCCESS Selected the right advertisement message successfully.
@retval EFI_OUT_OF_RESOURCES Required system resources could not be allocated.
@retval Others Failed to select the advertise message.
**/
EFI_STATUS
Dhcp6SelectAdvertiseMsg (
IN DHCP6_INSTANCE *Instance,
IN EFI_DHCP6_PACKET *AdSelect
)
{
EFI_STATUS Status;
UINT8 *Option;
ASSERT (AdSelect != NULL);
//
// Callback to user with the selected advertisement packet, and the user
// might overwrite it.
//
Status = Dhcp6CallbackUser (Instance, Dhcp6SelectAdvertise, &AdSelect);
if (EFI_ERROR (Status)) {
return Status;
}
Instance->AdSelect = AdSelect;
//
// Dequeue the sent packet for the retransmission since advertisement selected.
//
Status = Dhcp6DequeueRetry (
Instance,
AdSelect->Dhcp6.Header.TransactionId,
FALSE
);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Check whether there is server unicast option in the selected advertise
// packet, and update it.
//
Option = Dhcp6SeekOption (
AdSelect->Dhcp6.Option,
AdSelect->Length - sizeof (EFI_DHCP6_HEADER),
Dhcp6OptServerUnicast
);
if (Option != NULL) {
Instance->Unicast = AllocateZeroPool (sizeof (EFI_IPv6_ADDRESS));
if (Instance->Unicast == NULL) {
return EFI_OUT_OF_RESOURCES;
}
CopyMem (Instance->Unicast, DHCP6_OFFSET_OF_OPT_DATA (Option), sizeof (EFI_IPv6_ADDRESS));
}
//
// Update the information of the Ia by the selected advertisement message.
//
Status = Dhcp6UpdateIaInfo (Instance, AdSelect);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Send the request message to continue the S.A.R.R. process.
//
return Dhcp6SendRequestMsg (Instance);
}
/**
Handle with the Dhcp6 advertisement message.
@param[in] Instance The pointer to the Dhcp6 instance.
@param[in] Packet The pointer to the Dhcp6 advertisement message.
@retval EFI_SUCCESS Processed the advertisement message successfully.
@retval EFI_OUT_OF_RESOURCES Required system resources could not be allocated.
@retval EFI_DEVICE_ERROR An unexpected error.
@retval Others Failed to process the advertise message.
**/
EFI_STATUS
Dhcp6HandleAdvertiseMsg (
IN DHCP6_INSTANCE *Instance,
IN EFI_DHCP6_PACKET *Packet
)
{
EFI_STATUS Status;
UINT8 *Option;
BOOLEAN Timeout;
ASSERT (Instance->Config);
ASSERT (Instance->IaCb.Ia);
Timeout = FALSE;
//
// If the client does receives a valid reply message that includes a rapid
// commit option since a solicit with rapid commit option sent before, select
// this reply message. Or else, process the advertise messages as normal.
// See details in the section-17.1.4 of rfc-3315.
//
Option = Dhcp6SeekOption (
Packet->Dhcp6.Option,
Packet->Length - sizeof (EFI_DHCP6_HEADER),
Dhcp6OptRapidCommit
);
if ((Option != NULL) && Instance->Config->RapidCommit && (Packet->Dhcp6.Header.MessageType == Dhcp6MsgReply)) {
return Dhcp6HandleReplyMsg (Instance, Packet);
}
if (Packet->Dhcp6.Header.MessageType != Dhcp6MsgAdvertise) {
return EFI_DEVICE_ERROR;
}
//
// Client must ignore any advertise message that includes a status code option
// containing the value noaddrsavail, with the exception that the client may
// display the associated status message to the user.
// See the details in the section-17.1.3 of rfc-3315.
//
Status = Dhcp6SeekStsOption (
Instance,
Packet,
&Option
);
if (EFI_ERROR (Status)) {
return EFI_DEVICE_ERROR;
}
//
// Callback to user with the received packet and check the user's feedback.
//
Status = Dhcp6CallbackUser (Instance, Dhcp6RcvdAdvertise, &Packet);
if (!EFI_ERROR (Status)) {
//
// Success means user choose the current advertisement packet.
//
if (Instance->AdSelect != NULL) {
FreePool (Instance->AdSelect);
}
//
// Store the selected advertisement packet and set a flag.
//
Instance->AdSelect = AllocateZeroPool (Packet->Size);
if (Instance->AdSelect == NULL) {
return EFI_OUT_OF_RESOURCES;
}
CopyMem (Instance->AdSelect, Packet, Packet->Size);
Instance->AdPref = 0xff;
} else if (Status == EFI_NOT_READY) {
//
// Not_ready means user wants to continue to receive more advertise packets.
//
if ((Instance->AdPref == 0xff) && (Instance->AdSelect == NULL)) {
//
// It's a tricky point. The timer routine set adpref as 0xff if the first
// rt timeout and no advertisement received, which means any advertisement
// received will be selected after the first rt.
//
Timeout = TRUE;
}
//
// Check whether the current packet has a 255 preference option or not.
// Take non-preference option as 0 value.
//
Option = Dhcp6SeekOption (
Packet->Dhcp6.Option,
Packet->Length - 4,
Dhcp6OptPreference
);
if ((Instance->AdSelect == NULL) || ((Option != NULL) && (*(Option + 4) > Instance->AdPref))) {
//
// No advertisements received before or preference is more than other
// advertisements received before. Then store the new packet and the
// preference value.
//
if (Instance->AdSelect != NULL) {
FreePool (Instance->AdSelect);
}
Instance->AdSelect = AllocateZeroPool (Packet->Size);
if (Instance->AdSelect == NULL) {
return EFI_OUT_OF_RESOURCES;
}
CopyMem (Instance->AdSelect, Packet, Packet->Size);
if (Option != NULL) {
Instance->AdPref = *(DHCP6_OFFSET_OF_OPT_DATA (Option));
}
} else {
//
// Non-preference and other advertisements received before or current
// preference is less than other advertisements received before.
// Leave the packet alone.
}
} else {
//
// Other error status means termination.
//
return Status;
}
//
// Client must collect advertise messages as more as possible until the first
// RT has elapsed, or get a highest preference 255 advertise.
// See details in the section-17.1.2 of rfc-3315.
//
if ((Instance->AdPref == 0xff) || Timeout) {
Status = Dhcp6SelectAdvertiseMsg (Instance, Instance->AdSelect);
}
return Status;
}
/**
The Dhcp6 stateful exchange process routine.
@param[in] Instance The pointer to the Dhcp6 instance.
@param[in] Packet The pointer to the received Dhcp6 message.
**/
VOID
Dhcp6HandleStateful (
IN DHCP6_INSTANCE *Instance,
IN EFI_DHCP6_PACKET *Packet
)
{
EFI_STATUS Status;
EFI_DHCP6_DUID *ClientId;
DHCP6_SERVICE *Service;
UINT8 *Option;
Service = Instance->Service;
ClientId = Service->ClientId;
Status = EFI_SUCCESS;
if (Instance->Config == NULL) {
goto ON_CONTINUE;
}
ASSERT (ClientId);
ASSERT (Instance->Config);
ASSERT (Instance->IaCb.Ia);
//
// Discard the packet if not advertisement or reply packet.
//
if ((Packet->Dhcp6.Header.MessageType != Dhcp6MsgAdvertise) && (Packet->Dhcp6.Header.MessageType != Dhcp6MsgReply)) {
goto ON_CONTINUE;
}
//
// Check whether include client Id or not.
//
Option = Dhcp6SeekOption (
Packet->Dhcp6.Option,
Packet->Length - DHCP6_SIZE_OF_COMBINED_CODE_AND_LEN,
Dhcp6OptClientId
);
if ((Option == NULL) || (CompareMem (DHCP6_OFFSET_OF_OPT_DATA (Option), ClientId->Duid, ClientId->Length) != 0)) {
goto ON_CONTINUE;
}
//
// Check whether include server Id or not.
//
Option = Dhcp6SeekOption (
Packet->Dhcp6.Option,
Packet->Length - DHCP6_SIZE_OF_COMBINED_CODE_AND_LEN,
Dhcp6OptServerId
);
if (Option == NULL) {
goto ON_CONTINUE;
}
switch (Instance->IaCb.Ia->State) {
case Dhcp6Selecting:
//
// Handle the advertisement message when in the Dhcp6Selecting state.
// Do not need check return status, if failed, just continue to the next.
//
Dhcp6HandleAdvertiseMsg (Instance, Packet);
break;
case Dhcp6Requesting:
case Dhcp6Confirming:
case Dhcp6Renewing:
case Dhcp6Rebinding:
case Dhcp6Releasing:
case Dhcp6Declining:
//
// Handle the reply message when in the Dhcp6Requesting, Dhcp6Renewing
// Dhcp6Rebinding, Dhcp6Releasing and Dhcp6Declining state.
// If failed here, it should reset the current session.
//
Status = Dhcp6HandleReplyMsg (Instance, Packet);
if (EFI_ERROR (Status)) {
goto ON_EXIT;
}
break;
default:
//
// Other state has not supported yet.
//
break;
}
ON_CONTINUE:
//
// Continue to receive the following Dhcp6 message.
//
Status = UdpIoRecvDatagram (
Service->UdpIo,
Dhcp6ReceivePacket,
Service,
0
);
ON_EXIT:
if (EFI_ERROR (Status)) {
Dhcp6CleanupSession (Instance, Status);
}
}
/**
The Dhcp6 stateless exchange process routine.
@param[in] Instance The pointer to the Dhcp6 instance.
@param[in] Packet The pointer to the received Dhcp6 message.
**/
VOID
Dhcp6HandleStateless (
IN DHCP6_INSTANCE *Instance,
IN EFI_DHCP6_PACKET *Packet
)
{
EFI_STATUS Status;
DHCP6_SERVICE *Service;
DHCP6_INF_CB *InfCb;
UINT8 *Option;
BOOLEAN IsMatched;
Service = Instance->Service;
Status = EFI_SUCCESS;
IsMatched = FALSE;
InfCb = NULL;
if (Packet->Dhcp6.Header.MessageType != Dhcp6MsgReply) {
goto ON_EXIT;
}
//
// Check whether it's a desired Info-request message by Xid.
//
while (!IsListEmpty (&Instance->InfList)) {
InfCb = NET_LIST_HEAD (&Instance->InfList, DHCP6_INF_CB, Link);
if (InfCb->Xid == Packet->Dhcp6.Header.TransactionId) {
IsMatched = TRUE;
break;
}
}
if (!IsMatched) {
goto ON_EXIT;
}
//
// Check whether include server Id or not.
//
Option = Dhcp6SeekOption (
Packet->Dhcp6.Option,
Packet->Length - sizeof (EFI_DHCP6_HEADER),
Dhcp6OptServerId
);
if (Option == NULL) {
goto ON_EXIT;
}
//
// Callback to user with the received packet and check the user's feedback.
//
Status = InfCb->ReplyCallback (
&Instance->Dhcp6,
InfCb->CallbackContext,
Packet
);
if (Status == EFI_NOT_READY) {
//
// Success or aborted will both stop this info-request exchange process,
// but not ready means user wants to continue to receive reply.
//
goto ON_EXIT;
}
//
// Dequeue the sent packet from the txlist if the xid matched, and ignore
// if no xid matched.
//
Dhcp6DequeueRetry (
Instance,
Packet->Dhcp6.Header.TransactionId,
FALSE
);
//
// For sync, set the status out of polling for info-request.
//
Instance->UdpSts = Status;
ON_EXIT:
Status = UdpIoRecvDatagram (
Service->UdpIo,
Dhcp6ReceivePacket,
Service,
0
);
if (EFI_ERROR (Status)) {
Dhcp6CleanupRetry (Instance, DHCP6_PACKET_STATELESS);
}
}
/**
The receive callback function for Dhcp6 exchange process.
@param[in] Udp6Wrap 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
Dhcp6ReceivePacket (
IN NET_BUF *Udp6Wrap,
IN UDP_END_POINT *EndPoint,
IN EFI_STATUS IoStatus,
IN VOID *Context
)
{
EFI_DHCP6_HEADER *Head;
EFI_DHCP6_PACKET *Packet;
DHCP6_SERVICE *Service;
DHCP6_INSTANCE *Instance;
DHCP6_TX_CB *TxCb;
UINT32 Size;
BOOLEAN IsDispatched;
BOOLEAN IsStateless;
LIST_ENTRY *Entry1;
LIST_ENTRY *Next1;
LIST_ENTRY *Entry2;
LIST_ENTRY *Next2;
EFI_STATUS Status;
ASSERT (Udp6Wrap != NULL);
ASSERT (Context != NULL);
Service = (DHCP6_SERVICE *)Context;
Instance = NULL;
Packet = NULL;
IsDispatched = FALSE;
IsStateless = FALSE;
if (EFI_ERROR (IoStatus)) {
return;
}
if (Udp6Wrap->TotalSize < sizeof (EFI_DHCP6_HEADER)) {
goto ON_CONTINUE;
}
//
// Copy the net buffer received from upd6 to a Dhcp6 packet.
//
Size = sizeof (EFI_DHCP6_PACKET) + Udp6Wrap->TotalSize;
Packet = (EFI_DHCP6_PACKET *)AllocateZeroPool (Size);
if (Packet == NULL) {
goto ON_CONTINUE;
}
Packet->Size = Size;
Head = &Packet->Dhcp6.Header;
Packet->Length = NetbufCopy (Udp6Wrap, 0, Udp6Wrap->TotalSize, (UINT8 *)Head);
if (Packet->Length == 0) {
goto ON_CONTINUE;
}
//
// Dispatch packet to right instance by transaction id.
//
NET_LIST_FOR_EACH_SAFE (Entry1, Next1, &Service->Child) {
Instance = NET_LIST_USER_STRUCT (Entry1, DHCP6_INSTANCE, Link);
NET_LIST_FOR_EACH_SAFE (Entry2, Next2, &Instance->TxList) {
TxCb = NET_LIST_USER_STRUCT (Entry2, DHCP6_TX_CB, Link);
if (Packet->Dhcp6.Header.TransactionId == TxCb->Xid) {
//
// Find the corresponding packet in tx list, and check it whether belongs
// to stateful exchange process.
//
if (TxCb->TxPacket->Dhcp6.Header.MessageType == Dhcp6MsgInfoRequest) {
IsStateless = TRUE;
}
IsDispatched = TRUE;
break;
}
}
if (IsDispatched) {
break;
}
}
//
// Skip this packet if not dispatched to any instance.
//
if (!IsDispatched) {
goto ON_CONTINUE;
}
//
// Dispatch the received packet ot the right instance.
//
if (IsStateless) {
Dhcp6HandleStateless (Instance, Packet);
} else {
Dhcp6HandleStateful (Instance, Packet);
}
ON_CONTINUE:
if (!IsDispatched) {
Status = UdpIoRecvDatagram (
Service->UdpIo,
Dhcp6ReceivePacket,
Service,
0
);
if (EFI_ERROR (Status)) {
NET_LIST_FOR_EACH_SAFE (Entry1, Next1, &Service->Child) {
Instance = NET_LIST_USER_STRUCT (Entry1, DHCP6_INSTANCE, Link);
Dhcp6CleanupRetry (Instance, DHCP6_PACKET_ALL);
}
}
}
NetbufFree (Udp6Wrap);
if (Packet != NULL) {
FreePool (Packet);
}
}
/**
Detect Link movement for specified network device.
This routine will try to invoke Snp->GetStatus() to get the media status.
If media present status switches from unpresent to present, a link movement
is detected. Note that the underlying UNDI driver may not support reporting
media status from GET_STATUS command. If that, fail to detect link movement.
@param[in] Instance The pointer to DHCP6_INSTANCE.
@retval TRUE A link movement is detected.
@retval FALSE A link movement is not detected.
**/
BOOLEAN
Dhcp6LinkMovDetect (
IN DHCP6_INSTANCE *Instance
)
{
UINT32 InterruptStatus;
BOOLEAN MediaPresent;
EFI_STATUS Status;
EFI_SIMPLE_NETWORK_PROTOCOL *Snp;
ASSERT (Instance != NULL);
Snp = Instance->Service->Snp;
MediaPresent = Instance->MediaPresent;
//
// Check whether SNP support media detection
//
if (!Snp->Mode->MediaPresentSupported) {
return FALSE;
}
//
// Invoke Snp->GetStatus() to refresh MediaPresent field in SNP mode data
//
Status = Snp->GetStatus (Snp, &InterruptStatus, NULL);
if (EFI_ERROR (Status)) {
return FALSE;
}
Instance->MediaPresent = Snp->Mode->MediaPresent;
//
// Media transimit Unpresent to Present means new link movement is detected.
//
if (!MediaPresent && Instance->MediaPresent) {
return TRUE;
}
return FALSE;
}
/**
The timer routine of the Dhcp6 instance for each second.
@param[in] Event The timer event.
@param[in] Context The opaque parameter to the function.
**/
VOID
EFIAPI
Dhcp6OnTimerTick (
IN EFI_EVENT Event,
IN VOID *Context
)
{
LIST_ENTRY *Entry;
LIST_ENTRY *NextEntry;
DHCP6_INSTANCE *Instance;
DHCP6_TX_CB *TxCb;
DHCP6_IA_CB *IaCb;
UINT32 LossTime;
EFI_STATUS Status;
ASSERT (Context != NULL);
Instance = (DHCP6_INSTANCE *)Context;
//
// 1. Loop the tx list, count live time of every tx packet to check whether
// need re-transmit or not.
//
NET_LIST_FOR_EACH_SAFE (Entry, NextEntry, &Instance->TxList) {
TxCb = NET_LIST_USER_STRUCT (Entry, DHCP6_TX_CB, Link);
TxCb->TickTime++;
if (TxCb->TickTime > TxCb->RetryExp) {
//
// Handle the first rt in the transmission of solicit specially.
//
if (((TxCb->RetryCnt == 0) || TxCb->SolicitRetry) && (TxCb->TxPacket->Dhcp6.Header.MessageType == Dhcp6MsgSolicit)) {
if (Instance->AdSelect == NULL) {
//
// Set adpref as 0xff here to indicate select any advertisement
// afterwards.
//
Instance->AdPref = 0xff;
} else {
//
// Select the advertisement received before.
//
Status = Dhcp6SelectAdvertiseMsg (Instance, Instance->AdSelect);
if (Status == EFI_ABORTED) {
goto ON_CLOSE;
} else if (EFI_ERROR (Status)) {
TxCb->RetryCnt++;
}
return;
}
}
//
// Increase the retry count for the packet and add up the total loss time.
//
TxCb->RetryCnt++;
TxCb->RetryLos += TxCb->RetryExp;
//
// Check whether overflow the max retry count limit for this packet
//
if ((TxCb->RetryCtl.Mrc != 0) && (TxCb->RetryCtl.Mrc < TxCb->RetryCnt)) {
Status = EFI_NO_RESPONSE;
goto ON_CLOSE;
}
//
// Check whether overflow the max retry duration for this packet
//
if ((TxCb->RetryCtl.Mrd != 0) && (TxCb->RetryCtl.Mrd <= TxCb->RetryLos)) {
Status = EFI_NO_RESPONSE;
goto ON_CLOSE;
}
//
// Re-calculate retry expire timeout for the next time.
//
// Firstly, Check the new calculated time whether overflow the max retry
// expire time.
//
TxCb->RetryExp = Dhcp6CalculateExpireTime (
TxCb->RetryExp,
FALSE,
TRUE
);
if ((TxCb->RetryCtl.Mrt != 0) && (TxCb->RetryCtl.Mrt < TxCb->RetryExp)) {
TxCb->RetryExp = Dhcp6CalculateExpireTime (
TxCb->RetryCtl.Mrt,
TRUE,
TRUE
);
}
//
// Secondly, Check the new calculated time whether overflow the max retry
// duration time.
//
LossTime = TxCb->RetryLos + TxCb->RetryExp;
if ((TxCb->RetryCtl.Mrd != 0) && (TxCb->RetryCtl.Mrd < LossTime)) {
TxCb->RetryExp = TxCb->RetryCtl.Mrd - TxCb->RetryLos;
}
//
// Reset the tick time for the next retransmission
//
TxCb->TickTime = 0;
//
// Retransmit the last sent packet again.
//
Dhcp6TransmitPacket (Instance, TxCb->TxPacket, TxCb->Elapsed);
TxCb->SolicitRetry = FALSE;
if (TxCb->TxPacket->Dhcp6.Header.MessageType == Dhcp6MsgSolicit) {
TxCb->SolicitRetry = TRUE;
}
}
}
//
// 2. Check the configured Ia, count lease time of every valid Ia to check
// whether need to renew or rebind this Ia.
//
IaCb = &Instance->IaCb;
if ((Instance->Config == NULL) || (IaCb->Ia == NULL)) {
return;
}
if ((IaCb->Ia->State == Dhcp6Bound) || (IaCb->Ia->State == Dhcp6Renewing) || (IaCb->Ia->State == Dhcp6Rebinding)) {
IaCb->LeaseTime++;
if ((IaCb->LeaseTime > IaCb->T2) && (IaCb->Ia->State == Dhcp6Bound)) {
//
// Exceed t2, send rebind packet to extend the Ia lease.
//
Dhcp6SendRenewRebindMsg (Instance, TRUE);
} else if ((IaCb->LeaseTime > IaCb->T1) && (IaCb->Ia->State == Dhcp6Bound)) {
//
// Exceed t1, send renew packet to extend the Ia lease.
//
Dhcp6SendRenewRebindMsg (Instance, FALSE);
}
}
//
// 3. In any situation when a client may have moved to a new link, the
// client MUST initiate a Confirm/Reply message exchange.
//
if (Dhcp6LinkMovDetect (Instance) && (IaCb->Ia->State == Dhcp6Bound)) {
Dhcp6SendConfirmMsg (Instance);
}
return;
ON_CLOSE:
if (Dhcp6IsValidTxCb (Instance, TxCb) &&
(TxCb->TxPacket != NULL) &&
((TxCb->TxPacket->Dhcp6.Header.MessageType == Dhcp6MsgInfoRequest) ||
(TxCb->TxPacket->Dhcp6.Header.MessageType == Dhcp6MsgRenew) ||
(TxCb->TxPacket->Dhcp6.Header.MessageType == Dhcp6MsgConfirm))
)
{
//
// The failure of renew/Confirm will still switch to the bound state.
//
if ((TxCb->TxPacket->Dhcp6.Header.MessageType == Dhcp6MsgRenew) ||
(TxCb->TxPacket->Dhcp6.Header.MessageType == Dhcp6MsgConfirm))
{
ASSERT (Instance->IaCb.Ia);
Instance->IaCb.Ia->State = Dhcp6Bound;
}
//
// The failure of info-request will return no response.
//
if (TxCb->TxPacket->Dhcp6.Header.MessageType == Dhcp6MsgInfoRequest) {
Instance->UdpSts = EFI_NO_RESPONSE;
}
Dhcp6DequeueRetry (
Instance,
TxCb->Xid,
TRUE
);
} else {
//
// The failure of the others will terminate current state machine if timeout.
//
Dhcp6CleanupSession (Instance, Status);
}
}