1.Fix a bug in Dhcp4Dxe driver to correct the ‘secs’ field in DHCP message.

Signed-off-by: sfu5
Reviewed-by: tye
Reviewed-by: xdu2

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12742 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Universal/Network/Dhcp4Dxe/Dhcp4Driver.c

@@ -478,6 +478,7 @@ DhcpInitProtocol (
   Instance->RenewRebindEvent  = NULL;
   Instance->Token             = NULL;
   Instance->UdpIo             = NULL;
+  Instance->ElaspedTime       = 0;
   NetbufQueInit (&Instance->ResponseQueue);
 }
 

MdeModulePkg/Universal/Network/Dhcp4Dxe/Dhcp4Impl.c

@@ -1,7 +1,7 @@
 /** @file
   This file implement the EFI_DHCP4_PROTOCOL interface.
 
-Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
 This program and the accompanying materials
 are licensed and made available under the terms and conditions of the BSD License
 which accompanies this distribution.  The full text of the license may be found at
@@ -932,6 +932,12 @@ EfiDhcp4RenewRebind (
     DhcpSetState (DhcpSb, Dhcp4Rebinding, FALSE);
   }
 
+  //
+  // Clear initial time to make sure that elapsed-time
+  // is set to 0 for first REQUEST in renewal process.
+  //
+  Instance->ElaspedTime = 0;
+
   Status = DhcpSendMessage (
              DhcpSb,
              DhcpSb->Selected,
@@ -1723,3 +1729,19 @@ EfiDhcp4Parse (
 
   return EFI_SUCCESS;
 }
+
+/**
+  Set the elapsed time based on the given instance and the pointer to the
+  elapsed time option.
+
+  @param[in]      Elapsed       The pointer to the position to append.
+  @param[in]      Instance      The pointer to the Dhcp4 instance.
+**/
+VOID
+SetElapsedTime (
+  IN     UINT16                 *Elapsed,
+  IN     DHCP_PROTOCOL          *Instance
+  )
+{
+  WriteUnaligned16 (Elapsed, HTONS(Instance->ElaspedTime));
+}

MdeModulePkg/Universal/Network/Dhcp4Dxe/Dhcp4Impl.h

@@ -6,7 +6,7 @@
   RFC 1534: Interoperation Between DHCP and BOOTP
   RFC 3396: Encoding Long Options in DHCP.
   
-Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
 This program and the accompanying materials
 are licensed and made available under the terms and conditions of the BSD License
 which accompanies this distribution.  The full text of the license may be found at
@@ -71,6 +71,7 @@ struct _DHCP_PROTOCOL {
   EFI_DHCP4_TRANSMIT_RECEIVE_TOKEN  *Token;
   UDP_IO                            *UdpIo; // The UDP IO used for TransmitReceive.
   UINT32                            Timeout;
+  UINT16                            ElaspedTime;
   NET_BUF_QUEUE                     ResponseQueue;
 };
 
@@ -183,4 +184,17 @@ DhcpCleanConfigure (
   IN OUT EFI_DHCP4_CONFIG_DATA  *Config
   );
 
+/**
+  Set the elapsed time based on the given instance and the pointer to the
+  elapsed time option.
+
+  @param[in]      Elapsed       The pointer to the position to append.
+  @param[in]      Instance      The pointer to the Dhcp4 instance.
+**/
+VOID
+SetElapsedTime (
+  IN     UINT16                 *Elapsed,
+  IN     DHCP_PROTOCOL          *Instance
+  );
+
 #endif

MdeModulePkg/Universal/Network/Dhcp4Dxe/Dhcp4Io.c

@@ -1,7 +1,7 @@
 /** @file
   EFI DHCP protocol implementation.
   
-Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
 This program and the accompanying materials
 are licensed and made available under the terms and conditions of the BSD License
 which accompanies this distribution.  The full text of the license may be found at
@@ -37,6 +37,11 @@ DhcpInitRequest (
 
   ASSERT ((DhcpSb->DhcpState == Dhcp4Init) || (DhcpSb->DhcpState == Dhcp4InitReboot));
 
+  //
+  // Clear initial time to make sure that elapsed-time is set to 0 for first Discover or REQUEST message.
+  //
+  DhcpSb->ActiveChild->ElaspedTime= 0;
+  
   if (DhcpSb->DhcpState == Dhcp4Init) {
     DhcpSetState (DhcpSb, Dhcp4Selecting, FALSE);
     Status = DhcpSendMessage (DhcpSb, NULL, NULL, DHCP_MSG_DISCOVER, NULL);
@@ -1218,6 +1223,17 @@ DhcpSendMessage (
   EFI_IP4 (Head->ClientAddr) = HTONL (DhcpSb->ClientAddr);
   CopyMem (Head->ClientHwAddr, DhcpSb->Mac.Addr, DhcpSb->HwLen);
 
+  if ((Type == DHCP_MSG_DECLINE) || (Type == DHCP_MSG_RELEASE)) {
+    Head->Seconds = 0;
+  } else if ((Type == DHCP_MSG_REQUEST) && (DhcpSb->DhcpState == Dhcp4Requesting)) {
+    //
+    // Use the same value as the original DHCPDISCOVER message.
+    //
+    Head->Seconds = DhcpSb->LastPacket->Dhcp4.Header.Seconds;
+  } else {
+    SetElapsedTime(&Head->Seconds, DhcpSb->ActiveChild);
+  }
+
   //
   // Append the DHCP message type
   //
@@ -1429,7 +1445,12 @@ DhcpRetransmit (
 
   ASSERT (DhcpSb->LastPacket != NULL);
 
-  DhcpSb->LastPacket->Dhcp4.Header.Seconds = HTONS (*(UINT16 *)(&DhcpSb->LastTimeout));
+  //
+  // For REQUEST message in Dhcp4Requesting state, do not change the secs fields.
+  //
+  if (DhcpSb->DhcpState != Dhcp4Requesting) {
+    SetElapsedTime(&DhcpSb->LastPacket->Dhcp4.Header.Seconds, DhcpSb->ActiveChild);
+  }
 
   //
   // Wrap it into a netbuf then send it.
@@ -1503,6 +1524,13 @@ DhcpOnTimerTick (
   DhcpSb   = (DHCP_SERVICE *) Context;
   Instance = DhcpSb->ActiveChild;
 
+  //
+  // 0xffff is the maximum supported value for elapsed time according to RFC.
+  //
+  if (Instance != NULL && Instance->ElaspedTime < 0xffff) {
+    Instance->ElaspedTime++;
+  }
+  
   //
   // Check the retransmit timer
   //
@@ -1593,6 +1621,8 @@ DhcpOnTimerTick (
         goto END_SESSION;
       }
 
+      Instance->ElaspedTime= 0;
+      
       Status = DhcpSendMessage (
                  DhcpSb,
                  DhcpSb->Selected,
@@ -1613,6 +1643,8 @@ DhcpOnTimerTick (
         goto END_SESSION;
       }
 
+      Instance->ElaspedTime= 0;
+
       Status = DhcpSendMessage (
                  DhcpSb,
                  DhcpSb->Selected,