/** @file\r
DnsDxe support functions implementation.\r
\r
-Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>\r
+Copyright (c) 2016 - 2017, Intel Corporation. All rights reserved.<BR>\r
This program and the accompanying materials\r
are licensed and made available under the terms and conditions of the BSD License\r
which accompanies this distribution. The full text of the license may be found at\r
return FALSE;\r
}\r
\r
- while (!EFI_ERROR (gBS->CheckEvent (Service->TimerToGetMap))) {\r
+ while (EFI_ERROR (gBS->CheckEvent (Service->TimerToGetMap))) {\r
Udp->Poll (Udp);\r
\r
if (!EFI_ERROR (Udp->GetModeData (Udp, NULL, &Ip4Mode, NULL, NULL)) &&\r
return FALSE;\r
}\r
\r
- while (!EFI_ERROR (gBS->CheckEvent (Service->TimerToGetMap))) {\r
+ while (EFI_ERROR (gBS->CheckEvent (Service->TimerToGetMap))) {\r
Udp->Poll (Udp);\r
\r
if (!EFI_ERROR (Udp->GetModeData (Udp, NULL, &Ip6Mode, NULL, NULL))) {\r
FreePool (Ip6Mode.IcmpTypeList);\r
}\r
\r
- if (Ip6Mode.IsConfigured) {\r
+ if (!Ip6Mode.IsStarted || Ip6Mode.IsConfigured) {\r
Udp->Configure (Udp, NULL);\r
- return (BOOLEAN) (Udp->Configure (Udp, UdpCfgData) == EFI_SUCCESS);\r
+ if (Udp->Configure (Udp, UdpCfgData) == EFI_SUCCESS) {\r
+ return TRUE;\r
+ }\r
}\r
}\r
}\r
return EFI_SUCCESS;\r
}\r
\r
-/**\r
- Fill QName for IP querying. QName is a domain name represented as \r
- a sequence of labels, where each label consists of a length octet \r
- followed by that number of octets. The domain name terminates with \r
- the zero length octet for the null label of the root. Caller should \r
- take responsibility to the buffer in QName.\r
-\r
- @param HostName Queried HostName \r
-\r
- @retval NULL Failed to fill QName.\r
- @return QName filled successfully.\r
- \r
-**/ \r
-CHAR8 *\r
-EFIAPI\r
-DnsFillinQNameForQueryIp (\r
- IN CHAR16 *HostName\r
- )\r
-{\r
- CHAR8 *QueryName;\r
- CHAR8 *Header;\r
- CHAR8 *Tail;\r
- UINTN Len;\r
- UINTN Index;\r
-\r
- QueryName = NULL;\r
- Header = NULL;\r
- Tail = NULL;\r
-\r
- QueryName = AllocateZeroPool (DNS_DEFAULT_BLKSIZE);\r
- if (QueryName == NULL) {\r
- return NULL;\r
- }\r
- \r
- Header = QueryName;\r
- Tail = Header + 1;\r
- Len = 0;\r
- for (Index = 0; HostName[Index] != 0; Index++) {\r
- *Tail = (CHAR8) HostName[Index];\r
- if (*Tail == '.') {\r
- *Header = (CHAR8) Len;\r
- Header = Tail;\r
- Tail ++;\r
- Len = 0;\r
- } else {\r
- Tail++;\r
- Len++;\r
- }\r
- }\r
- *Header = (CHAR8) Len;\r
- *Tail = 0;\r
-\r
- return QueryName;\r
-}\r
-\r
/**\r
Find out whether the response is valid or invalid.\r
\r
@param TokensMap All DNS transmittal Tokens entry. \r
@param Identification Identification for queried packet. \r
@param Type Type for queried packet.\r
+ @param Class Class for queried packet.\r
@param Item Return corresponding Token entry.\r
\r
@retval TRUE The response is valid.\r
IN NET_MAP *TokensMap,\r
IN UINT16 Identification,\r
IN UINT16 Type,\r
+ IN UINT16 Class,\r
OUT NET_MAP_ITEM **Item\r
)\r
{\r
DnsHeader = (DNS_HEADER *) TxString;\r
QueryName = (CHAR8 *) (TxString + sizeof (*DnsHeader));\r
QuerySection = (DNS_QUERY_SECTION *) (QueryName + AsciiStrLen (QueryName) + 1);\r
-\r
- DnsHeader->Identification = NTOHS (DnsHeader->Identification);\r
- QuerySection->Type = NTOHS (QuerySection->Type);\r
\r
- if (DnsHeader->Identification == Identification && QuerySection->Type == Type) {\r
+ if (NTOHS (DnsHeader->Identification) == Identification &&\r
+ NTOHS (QuerySection->Type) == Type && \r
+ NTOHS (QuerySection->Class) == Class) {\r
return TRUE;\r
}\r
} \r
}\r
\r
- *Item =NULL;\r
+ *Item = NULL;\r
\r
return FALSE;\r
}\r
UINT32 IpCount;\r
UINT32 RRCount;\r
UINT32 AnswerSectionNum;\r
+ UINT32 CNameTtl;\r
\r
EFI_IPv4_ADDRESS *HostAddr4;\r
EFI_IPv6_ADDRESS *HostAddr6;\r
IpCount = 0;\r
RRCount = 0;\r
AnswerSectionNum = 0;\r
+ CNameTtl = 0;\r
\r
HostAddr4 = NULL;\r
HostAddr6 = NULL;\r
// Check DnsResponse Validity, if so, also get a valid NET_MAP_ITEM.\r
//\r
if (Instance->Service->IpVersion == IP_VERSION_4) {\r
- if (!IsValidDnsResponse (&Instance->Dns4TxTokens, DnsHeader->Identification, QuerySection->Type, &Item)) {\r
+ if (!IsValidDnsResponse (\r
+ &Instance->Dns4TxTokens, \r
+ DnsHeader->Identification, \r
+ QuerySection->Type,\r
+ QuerySection->Class,\r
+ &Item\r
+ )) {\r
*Completed = FALSE;\r
Status = EFI_ABORTED;\r
goto ON_EXIT;\r
ASSERT (Item != NULL);\r
Dns4TokenEntry = (DNS4_TOKEN_ENTRY *) (Item->Key);\r
} else {\r
- if (!IsValidDnsResponse (&Instance->Dns6TxTokens, DnsHeader->Identification, QuerySection->Type, &Item)) {\r
+ if (!IsValidDnsResponse (\r
+ &Instance->Dns6TxTokens, \r
+ DnsHeader->Identification, \r
+ QuerySection->Type,\r
+ QuerySection->Class,\r
+ &Item\r
+ )) {\r
*Completed = FALSE;\r
Status = EFI_ABORTED;\r
goto ON_EXIT;\r
// Continue Check Some Errors.\r
//\r
if (DnsHeader->Flags.Bits.RCode != DNS_FLAGS_RCODE_NO_ERROR || DnsHeader->AnswersNum < 1 || \\r
- DnsHeader->Flags.Bits.QR != DNS_FLAGS_QR_RESPONSE || QuerySection->Class != DNS_CLASS_INET) {\r
- Status = EFI_ABORTED;\r
- goto ON_EXIT;\r
- }\r
-\r
- //\r
- // Free the sending packet.\r
- //\r
- if (Item->Value != NULL) {\r
- NetbufFree ((NET_BUF *) (Item->Value));\r
+ DnsHeader->Flags.Bits.QR != DNS_FLAGS_QR_RESPONSE) {\r
+ //\r
+ // The domain name referenced in the query does not exist.\r
+ //\r
+ if (DnsHeader->Flags.Bits.RCode == DNS_FLAGS_RCODE_NAME_ERROR) {\r
+ Status = EFI_NOT_FOUND; \r
+ } else {\r
+ Status = EFI_DEVICE_ERROR;\r
+ }\r
+ \r
+ goto ON_COMPLETE;\r
}\r
\r
//\r
//\r
Dns6TokenEntry->Token->RspData.GLookupData = AllocatePool (sizeof (DNS_RESOURCE_RECORD));\r
if (Dns6TokenEntry->Token->RspData.GLookupData == NULL) {\r
- Status = EFI_UNSUPPORTED;\r
+ Status = EFI_OUT_OF_RESOURCES;\r
goto ON_EXIT;\r
}\r
Dns6TokenEntry->Token->RspData.GLookupData->RRList = AllocatePool (DnsHeader->AnswersNum * sizeof (DNS_RESOURCE_RECORD));\r
if (Dns6TokenEntry->Token->RspData.GLookupData->RRList == NULL) {\r
- Status = EFI_UNSUPPORTED;\r
+ Status = EFI_OUT_OF_RESOURCES;\r
goto ON_EXIT;\r
}\r
} else {\r
if (QuerySection->Type == DNS_TYPE_AAAA) {\r
Dns6TokenEntry->Token->RspData.H2AData = AllocatePool (sizeof (DNS6_HOST_TO_ADDR_DATA));\r
if (Dns6TokenEntry->Token->RspData.H2AData == NULL) {\r
- Status = EFI_UNSUPPORTED;\r
+ Status = EFI_OUT_OF_RESOURCES;\r
goto ON_EXIT;\r
}\r
Dns6TokenEntry->Token->RspData.H2AData->IpList = AllocatePool (DnsHeader->AnswersNum * sizeof (EFI_IPv6_ADDRESS));\r
if (Dns6TokenEntry->Token->RspData.H2AData->IpList == NULL) {\r
- Status = EFI_UNSUPPORTED;\r
+ Status = EFI_OUT_OF_RESOURCES;\r
goto ON_EXIT;\r
}\r
} else {\r
}\r
}\r
\r
+ Status = EFI_NOT_FOUND;\r
+\r
//\r
// Processing AnswerSection.\r
//\r
while (AnswerSectionNum < DnsHeader->AnswersNum) {\r
//\r
- // Answer name should be PTR.\r
+ // Answer name should be PTR, else EFI_UNSUPPORTED returned.\r
//\r
- ASSERT ((*(UINT8 *) AnswerName & 0xC0) == 0xC0);\r
+ if ((*(UINT8 *) AnswerName & 0xC0) != 0xC0) {\r
+ Status = EFI_UNSUPPORTED;\r
+ goto ON_EXIT;\r
+ }\r
\r
//\r
// Get Answer section.\r
//\r
Dns4RR[RRCount].QName = AllocateZeroPool (AsciiStrLen (QueryName) + 1);\r
if (Dns4RR[RRCount].QName == NULL) {\r
- Status = EFI_UNSUPPORTED;\r
+ Status = EFI_OUT_OF_RESOURCES;\r
goto ON_EXIT;\r
}\r
CopyMem (Dns4RR[RRCount].QName, QueryName, AsciiStrLen (QueryName));\r
Dns4RR[RRCount].DataLength = AnswerSection->DataLength;\r
Dns4RR[RRCount].RData = AllocateZeroPool (Dns4RR[RRCount].DataLength);\r
if (Dns4RR[RRCount].RData == NULL) {\r
- Status = EFI_UNSUPPORTED;\r
+ Status = EFI_OUT_OF_RESOURCES;\r
goto ON_EXIT;\r
}\r
CopyMem (Dns4RR[RRCount].RData, AnswerData, Dns4RR[RRCount].DataLength);\r
\r
RRCount ++;\r
+ Status = EFI_SUCCESS;\r
} else if (Instance->Service->IpVersion == IP_VERSION_6 && Dns6TokenEntry->GeneralLookUp) {\r
Dns6RR = Dns6TokenEntry->Token->RspData.GLookupData->RRList;\r
AnswerData = (UINT8 *) AnswerSection + sizeof (*AnswerSection);\r
//\r
Dns6RR[RRCount].QName = AllocateZeroPool (AsciiStrLen (QueryName) + 1);\r
if (Dns6RR[RRCount].QName == NULL) {\r
- Status = EFI_UNSUPPORTED;\r
+ Status = EFI_OUT_OF_RESOURCES;\r
goto ON_EXIT;\r
}\r
CopyMem (Dns6RR[RRCount].QName, QueryName, AsciiStrLen (QueryName));\r
Dns6RR[RRCount].DataLength = AnswerSection->DataLength;\r
Dns6RR[RRCount].RData = AllocateZeroPool (Dns6RR[RRCount].DataLength);\r
if (Dns6RR[RRCount].RData == NULL) {\r
- Status = EFI_UNSUPPORTED;\r
+ Status = EFI_OUT_OF_RESOURCES;\r
goto ON_EXIT;\r
}\r
CopyMem (Dns6RR[RRCount].RData, AnswerData, Dns6RR[RRCount].DataLength);\r
\r
RRCount ++;\r
+ Status = EFI_SUCCESS;\r
} else {\r
//\r
// It's not the GeneralLookUp querying. \r
//\r
// This is address entry, get Data.\r
//\r
- ASSERT (Dns4TokenEntry != NULL && AnswerSection->DataLength == 4);\r
+ ASSERT (Dns4TokenEntry != NULL);\r
+\r
+ if (AnswerSection->DataLength != 4) {\r
+ Status = EFI_ABORTED;\r
+ goto ON_EXIT;\r
+ }\r
\r
HostAddr4 = Dns4TokenEntry->Token->RspData.H2AData->IpList;\r
AnswerData = (UINT8 *) AnswerSection + sizeof (*AnswerSection);\r
CopyMem (&HostAddr4[IpCount], AnswerData, sizeof (EFI_IPv4_ADDRESS));\r
\r
- //\r
- // Update DNS cache dynamically.\r
- //\r
- if (Dns4CacheEntry != NULL) {\r
- if (Dns4CacheEntry->HostName != NULL) {\r
- FreePool (Dns4CacheEntry->HostName);\r
- }\r
-\r
- if (Dns4CacheEntry->IpAddress != NULL) {\r
- FreePool (Dns4CacheEntry->IpAddress);\r
- }\r
- \r
- FreePool (Dns4CacheEntry);\r
- }\r
-\r
// \r
- // Allocate new CacheEntry pool.\r
+ // Allocate new CacheEntry pool to update DNS cache dynamically.\r
//\r
Dns4CacheEntry = AllocateZeroPool (sizeof (EFI_DNS4_CACHE_ENTRY));\r
if (Dns4CacheEntry == NULL) {\r
- Status = EFI_UNSUPPORTED;\r
+ Status = EFI_OUT_OF_RESOURCES;\r
goto ON_EXIT;\r
}\r
Dns4CacheEntry->HostName = AllocateZeroPool (2 * (StrLen(Dns4TokenEntry->QueryHostName) + 1));\r
if (Dns4CacheEntry->HostName == NULL) {\r
- Status = EFI_UNSUPPORTED;\r
+ Status = EFI_OUT_OF_RESOURCES;\r
goto ON_EXIT;\r
}\r
CopyMem (Dns4CacheEntry->HostName, Dns4TokenEntry->QueryHostName, 2 * (StrLen(Dns4TokenEntry->QueryHostName) + 1));\r
Dns4CacheEntry->IpAddress = AllocateZeroPool (sizeof (EFI_IPv4_ADDRESS));\r
if (Dns4CacheEntry->IpAddress == NULL) {\r
- Status = EFI_UNSUPPORTED;\r
+ Status = EFI_OUT_OF_RESOURCES;\r
goto ON_EXIT;\r
}\r
CopyMem (Dns4CacheEntry->IpAddress, AnswerData, sizeof (EFI_IPv4_ADDRESS));\r
- Dns4CacheEntry->Timeout = AnswerSection->Ttl;\r
+\r
+ if (CNameTtl != 0 && AnswerSection->Ttl != 0) {\r
+ Dns4CacheEntry->Timeout = MIN (CNameTtl, AnswerSection->Ttl);\r
+ } else {\r
+ Dns4CacheEntry->Timeout = MAX (CNameTtl, AnswerSection->Ttl);\r
+ }\r
+ \r
+ UpdateDns4Cache (&mDriverData->Dns4CacheList, FALSE, TRUE, *Dns4CacheEntry);\r
+\r
+ // \r
+ // Free allocated CacheEntry pool.\r
+ //\r
+ FreePool (Dns4CacheEntry->HostName);\r
+ Dns4CacheEntry->HostName = NULL;\r
\r
- UpdateDns4Cache (&mDriverData->Dns4CacheList, FALSE, TRUE, *Dns4CacheEntry); \r
+ FreePool (Dns4CacheEntry->IpAddress);\r
+ Dns4CacheEntry->IpAddress = NULL;\r
\r
- IpCount ++; \r
+ FreePool (Dns4CacheEntry);\r
+ Dns4CacheEntry = NULL;\r
+\r
+ IpCount ++;\r
+ Status = EFI_SUCCESS;\r
break;\r
case DNS_TYPE_AAAA:\r
//\r
// This is address entry, get Data.\r
//\r
- ASSERT (Dns6TokenEntry != NULL && AnswerSection->DataLength == 16);\r
+ ASSERT (Dns6TokenEntry != NULL);\r
+\r
+ if (AnswerSection->DataLength != 16) {\r
+ Status = EFI_ABORTED;\r
+ goto ON_EXIT;\r
+ }\r
\r
HostAddr6 = Dns6TokenEntry->Token->RspData.H2AData->IpList;\r
AnswerData = (UINT8 *) AnswerSection + sizeof (*AnswerSection);\r
CopyMem (&HostAddr6[IpCount], AnswerData, sizeof (EFI_IPv6_ADDRESS));\r
\r
- //\r
- // Update DNS cache dynamically.\r
- //\r
- if (Dns6CacheEntry != NULL) {\r
- if (Dns6CacheEntry->HostName != NULL) {\r
- FreePool (Dns6CacheEntry->HostName);\r
- }\r
-\r
- if (Dns6CacheEntry->IpAddress != NULL) {\r
- FreePool (Dns6CacheEntry->IpAddress);\r
- }\r
- \r
- FreePool (Dns6CacheEntry);\r
- }\r
-\r
// \r
- // Allocate new CacheEntry pool.\r
+ // Allocate new CacheEntry pool to update DNS cache dynamically.\r
//\r
Dns6CacheEntry = AllocateZeroPool (sizeof (EFI_DNS6_CACHE_ENTRY));\r
if (Dns6CacheEntry == NULL) {\r
- Status = EFI_UNSUPPORTED;\r
+ Status = EFI_OUT_OF_RESOURCES;\r
goto ON_EXIT;\r
}\r
Dns6CacheEntry->HostName = AllocateZeroPool (2 * (StrLen(Dns6TokenEntry->QueryHostName) + 1));\r
if (Dns6CacheEntry->HostName == NULL) {\r
- Status = EFI_UNSUPPORTED;\r
+ Status = EFI_OUT_OF_RESOURCES;\r
goto ON_EXIT;\r
}\r
CopyMem (Dns6CacheEntry->HostName, Dns6TokenEntry->QueryHostName, 2 * (StrLen(Dns6TokenEntry->QueryHostName) + 1));\r
Dns6CacheEntry->IpAddress = AllocateZeroPool (sizeof (EFI_IPv6_ADDRESS));\r
if (Dns6CacheEntry->IpAddress == NULL) {\r
- Status = EFI_UNSUPPORTED;\r
+ Status = EFI_OUT_OF_RESOURCES;\r
goto ON_EXIT;\r
}\r
CopyMem (Dns6CacheEntry->IpAddress, AnswerData, sizeof (EFI_IPv6_ADDRESS));\r
- Dns6CacheEntry->Timeout = AnswerSection->Ttl;\r
+\r
+ if (CNameTtl != 0 && AnswerSection->Ttl != 0) {\r
+ Dns6CacheEntry->Timeout = MIN (CNameTtl, AnswerSection->Ttl);\r
+ } else {\r
+ Dns6CacheEntry->Timeout = MAX (CNameTtl, AnswerSection->Ttl);\r
+ }\r
+ \r
+ UpdateDns6Cache (&mDriverData->Dns6CacheList, FALSE, TRUE, *Dns6CacheEntry);\r
+\r
+ // \r
+ // Free allocated CacheEntry pool.\r
+ //\r
+ FreePool (Dns6CacheEntry->HostName);\r
+ Dns6CacheEntry->HostName = NULL;\r
\r
- UpdateDns6Cache (&mDriverData->Dns6CacheList, FALSE, TRUE, *Dns6CacheEntry); \r
+ FreePool (Dns6CacheEntry->IpAddress);\r
+ Dns6CacheEntry->IpAddress = NULL;\r
+\r
+ FreePool (Dns6CacheEntry);\r
+ Dns6CacheEntry = NULL;\r
\r
IpCount ++;\r
+ Status = EFI_SUCCESS;\r
+ break;\r
+ case DNS_TYPE_CNAME:\r
+ //\r
+ // According RFC 1034 - 3.6.2, if the query name is an alias, the name server will include the CNAME \r
+ // record in the response and restart the query at the domain name specified in the data field of the \r
+ // CNAME record. So, just record the TTL value of the CNAME, then skip to parse the next record.\r
+ //\r
+ CNameTtl = AnswerSection->Ttl;\r
break;\r
default:\r
Status = EFI_UNSUPPORTED;\r
}\r
}\r
}\r
-\r
+ \r
+ON_COMPLETE:\r
//\r
- // Parsing is complete, SignalEvent here.\r
+ // Parsing is complete, free the sending packet and signal Event here.\r
//\r
+ if (Item != NULL && Item->Value != NULL) {\r
+ NetbufFree ((NET_BUF *) (Item->Value));\r
+ }\r
+ \r
if (Instance->Service->IpVersion == IP_VERSION_4) {\r
ASSERT (Dns4TokenEntry != NULL);\r
Dns4RemoveTokenEntry (&Instance->Dns4TxTokens, Dns4TokenEntry);\r
- Dns4TokenEntry->Token->Status = EFI_SUCCESS;\r
+ Dns4TokenEntry->Token->Status = Status;\r
if (Dns4TokenEntry->Token->Event != NULL) {\r
gBS->SignalEvent (Dns4TokenEntry->Token->Event);\r
DispatchDpc ();\r
} else {\r
ASSERT (Dns6TokenEntry != NULL);\r
Dns6RemoveTokenEntry (&Instance->Dns6TxTokens, Dns6TokenEntry);\r
- Dns6TokenEntry->Token->Status = EFI_SUCCESS;\r
+ Dns6TokenEntry->Token->Status = Status;\r
if (Dns6TokenEntry->Token->Event != NULL) {\r
gBS->SignalEvent (Dns6TokenEntry->Token->Event);\r
DispatchDpc ();\r
}\r
}\r
\r
- // \r
- // Free allocated CacheEntry pool.\r
- //\r
- if (Dns4CacheEntry != NULL) {\r
- if (Dns4CacheEntry->HostName != NULL) {\r
- FreePool (Dns4CacheEntry->HostName);\r
- }\r
-\r
- if (Dns4CacheEntry->IpAddress != NULL) {\r
- FreePool (Dns4CacheEntry->IpAddress);\r
- }\r
-\r
- FreePool (Dns4CacheEntry);\r
- }\r
- \r
- if (Dns6CacheEntry != NULL) {\r
- if (Dns6CacheEntry->HostName != NULL) {\r
- FreePool (Dns6CacheEntry->HostName);\r
- }\r
-\r
- if (Dns6CacheEntry->IpAddress != NULL) {\r
- FreePool (Dns6CacheEntry->IpAddress);\r
- }\r
- \r
- FreePool (Dns6CacheEntry);\r
- }\r
-\r
ON_EXIT:\r
gBS->RestoreTPL (OldTpl);\r
return Status;\r
}\r
\r
ASSERT (Packet != NULL);\r
+\r
+ if (Packet->TotalSize <= sizeof (DNS_HEADER)) {\r
+ goto ON_EXIT;\r
+ }\r
\r
RcvString = NetbufGetByte (Packet, 0, NULL);\r
ASSERT (RcvString != NULL);\r
//\r
ParseDnsResponse (Instance, RcvString, &Completed);\r
\r
- ON_EXIT:\r
+ON_EXIT:\r
\r
- if (Packet != NULL) {\r
- NetbufFree (Packet);\r
- }\r
+ if (Packet != NULL) {\r
+ NetbufFree (Packet);\r
+ }\r
\r
- if (!Completed) {\r
- UdpIoRecvDatagram (Instance->UdpIo, DnsOnPacketReceived, Instance, 0);\r
- }\r
+ if (!Completed) {\r
+ UdpIoRecvDatagram (Instance->UdpIo, DnsOnPacketReceived, Instance, 0);\r
+ }\r
}\r
\r
/**\r
NET_FRAGMENT Frag;\r
DNS_HEADER *DnsHeader;\r
DNS_QUERY_SECTION *DnsQuery;\r
- \r
- Frag.Bulk = AllocatePool (DNS_DEFAULT_BLKSIZE * sizeof (UINT8));\r
+\r
+ //\r
+ // Messages carried by UDP are restricted to 512 bytes (not counting the IP\r
+ // or UDP headers).\r
+ //\r
+ Frag.Bulk = AllocatePool (DNS_MAX_MESSAGE_SIZE * sizeof (UINT8));\r
if (Frag.Bulk == NULL) {\r
return EFI_OUT_OF_RESOURCES;\r
}\r
Entry = mDriverData->Dns4CacheList.ForwardLink;\r
while (Entry != &mDriverData->Dns4CacheList) {\r
Item4 = NET_LIST_USER_STRUCT (Entry, DNS4_CACHE, AllCacheLink);\r
- if (Item4->DnsCache.Timeout<=0) {\r
+ if (Item4->DnsCache.Timeout == 0) {\r
RemoveEntryList (&Item4->AllCacheLink);\r
Entry = mDriverData->Dns4CacheList.ForwardLink;\r
} else {\r
Entry = mDriverData->Dns6CacheList.ForwardLink;\r
while (Entry != &mDriverData->Dns6CacheList) {\r
Item6 = NET_LIST_USER_STRUCT (Entry, DNS6_CACHE, AllCacheLink);\r
- if (Item6->DnsCache.Timeout<=0) {\r
+ if (Item6->DnsCache.Timeout == 0) {\r
RemoveEntryList (&Item6->AllCacheLink);\r
Entry = mDriverData->Dns6CacheList.ForwardLink;\r
} else {\r
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