+/**\r
+ Check whether IP driver could route the message which will be sent to ServerIp address.\r
+ \r
+ This function will check the IP6 route table every 1 seconds until specified timeout is expired, if a valid\r
+ route is found in IP6 route table, the address will be filed in GatewayAddr and return.\r
+\r
+ @param[in] Private The pointer to PXEBC_PRIVATE_DATA.\r
+ @param[in] TimeOutInSecond Timeout value in seconds.\r
+ @param[out] GatewayAddr Pointer to store the gateway IP address.\r
+\r
+ @retval EFI_SUCCESS Found a valid gateway address successfully.\r
+ @retval EFI_TIMEOUT The operation is time out.\r
+ @retval Other Unexpect error happened.\r
+ \r
+**/\r
+EFI_STATUS\r
+PxeBcCheckRouteTable (\r
+ IN PXEBC_PRIVATE_DATA *Private,\r
+ IN UINTN TimeOutInSecond,\r
+ OUT EFI_IPv6_ADDRESS *GatewayAddr\r
+ )\r
+{\r
+ EFI_STATUS Status;\r
+ EFI_IP6_PROTOCOL *Ip6;\r
+ EFI_IP6_MODE_DATA Ip6ModeData;\r
+ UINTN Index;\r
+ EFI_EVENT TimeOutEvt;\r
+ UINTN RetryCount;\r
+ BOOLEAN GatewayIsFound;\r
+\r
+ ASSERT (GatewayAddr != NULL);\r
+ ASSERT (Private != NULL);\r
+\r
+ Ip6 = Private->Ip6;\r
+ GatewayIsFound = FALSE;\r
+ RetryCount = 0;\r
+ TimeOutEvt = NULL;\r
+ ZeroMem (GatewayAddr, sizeof (EFI_IPv6_ADDRESS));\r
+\r
+ while (TRUE) {\r
+ Status = Ip6->GetModeData (Ip6, &Ip6ModeData, NULL, NULL);\r
+ if (EFI_ERROR (Status)) {\r
+ goto ON_EXIT;\r
+ }\r
+\r
+ //\r
+ // Find out the gateway address which can route the message whcih send to ServerIp.\r
+ //\r
+ for (Index = 0; Index < Ip6ModeData.RouteCount; Index++) {\r
+ if (NetIp6IsNetEqual (&Private->ServerIp.v6, &Ip6ModeData.RouteTable[Index].Destination, Ip6ModeData.RouteTable[Index].PrefixLength)) {\r
+ IP6_COPY_ADDRESS (GatewayAddr, &Ip6ModeData.RouteTable[Index].Gateway);\r
+ GatewayIsFound = TRUE;\r
+ break;\r
+ }\r
+ }\r
+\r
+ if (Ip6ModeData.AddressList != NULL) {\r
+ FreePool (Ip6ModeData.AddressList);\r
+ }\r
+ if (Ip6ModeData.GroupTable != NULL) {\r
+ FreePool (Ip6ModeData.GroupTable);\r
+ }\r
+ if (Ip6ModeData.RouteTable != NULL) {\r
+ FreePool (Ip6ModeData.RouteTable);\r
+ }\r
+ if (Ip6ModeData.NeighborCache != NULL) {\r
+ FreePool (Ip6ModeData.NeighborCache);\r
+ }\r
+ if (Ip6ModeData.PrefixTable != NULL) {\r
+ FreePool (Ip6ModeData.PrefixTable);\r
+ }\r
+ if (Ip6ModeData.IcmpTypeList != NULL) {\r
+ FreePool (Ip6ModeData.IcmpTypeList);\r
+ }\r
+ \r
+ if (GatewayIsFound || RetryCount == TimeOutInSecond) {\r
+ break;\r
+ }\r
+ \r
+ RetryCount++;\r
+ \r
+ //\r
+ // Delay 1 second then recheck it again.\r
+ //\r
+ if (TimeOutEvt == NULL) {\r
+ Status = gBS->CreateEvent (\r
+ EVT_TIMER,\r
+ TPL_CALLBACK,\r
+ NULL,\r
+ NULL,\r
+ &TimeOutEvt\r
+ );\r
+ if (EFI_ERROR (Status)) {\r
+ goto ON_EXIT;\r
+ }\r
+ }\r
+\r
+ Status = gBS->SetTimer (TimeOutEvt, TimerRelative, TICKS_PER_SECOND);\r
+ if (EFI_ERROR (Status)) {\r
+ goto ON_EXIT;\r
+ }\r
+ while (EFI_ERROR (gBS->CheckEvent (TimeOutEvt))) {\r
+ Ip6->Poll (Ip6);\r
+ }\r
+ }\r
+ \r
+ON_EXIT:\r
+ if (TimeOutEvt != NULL) {\r
+ gBS->CloseEvent (TimeOutEvt);\r
+ }\r
+ \r
+ if (GatewayIsFound) {\r
+ Status = EFI_SUCCESS;\r
+ } else if (RetryCount == TimeOutInSecond) {\r
+ Status = EFI_TIMEOUT;\r
+ }\r
+\r
+ return Status; \r
+}\r