--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vpnengine/ikeutils/src/pfkeyextdatautil.cpp	Thu Dec 17 09:14:51 2009 +0200
@@ -0,0 +1,110 @@
+/*
+* Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description:  VPN PFKEY extension data utility
+*
+*/
+
+
+#include <in_sock.h>
+#include <networking/pfkeyv2.h>
+#include <networking/pfkeyext.h>
+
+#include "ikemsgheader.h"
+#include "pfkeyextdatautil.h"
+
+// ======== MEMBER FUNCTIONS ========
+
+// ---------------------------------------------------------------------------
+// This static method builds a generic PFKEY API extension data for IPSEC.
+// This data contains all parameters needed by the IPSEC to do UDP
+// encapsulation/decpsulation for ESP packet. Generic extension data format is
+// LID format begining with four bytes extension header. Extension header
+// consists two bytes extension length and two bytes  extension ID. LID format
+// consists from one byte length, one byte ID and parameter data. 
+// Buffer format: HL,HID,LID,LID,...LID
+// Generic extension data buffer handling macros are defined in pfkeyext.h
+// (common macros with IPSEC)
+// ---------------------------------------------------------------------------
+//
+void PFKeyExtDataUtil::BuildUdpEncExtensionData( TDes8& aExtData,
+                                                 TUint32 aNAT_D_Flags,
+                                                 TBool aNATDetected,
+                                                 TBool aNokiaNATProbeUsed,
+                                                 TUint16 aUdpEncapsPort,
+                                                 TUint16 aKeepAliveTimeout,
+                                                 const TInetAddr& aDestinAddr,
+                                                 const TInetAddr& aOriginalAddr )
+    {
+    if ( aNAT_D_Flags )
+        {
+        aUdpEncapsPort = FLOATED_IKE_PORT; // for IETF specified ESP UDP encapsulation
+        if ( ( aNAT_D_Flags & LOCAL_END_NAT ) == 0 )
+            {
+            aKeepAliveTimeout = 0; // Local end is not behind NAT, no keepalive needed
+            }
+        }
+    else
+        {
+        //
+        // Nokia specific NAT traversal info (=ESP UDP tunneling)  
+        // If aNATDetected is true connection is over NAT:ted
+        // network (=local end behind NAT). UDP encapsulation shall
+        // then be done using configured port iEspUdpPort. If that
+        // value is undefined default port 9872 shall be used then.
+        // If aNATDetected is false and aNokiaNATProbeUsed is true
+        // the NAT probe procedure has confirmed that there is no
+        // NAT device between. ESP UDP encapsulation port is zeroed
+        // then to avoid unnecessary ESP UDP encapsulation.
+        // If aNokiaNATProbeUsed is false ESP UDP encapsulation is done
+        // without probing, if any aUdpEncapsPort is defined 
+        //
+        if ( !aNATDetected && aNokiaNATProbeUsed )
+            {
+            aUdpEncapsPort = 0;
+            }
+        }   
+
+    if ( aUdpEncapsPort == 0 )
+        {
+        aExtData.SetLength(0); // No extension data needed
+        return;
+        }
+
+    TPfkeyGenExtension NatExtension( aExtData, ESP_UDP_ENCAPSULATION_EXT );
+    
+    NatExtension.StoreParameter( UDP_ENCAPSULATION_PORT,
+                                 2,
+                                 (TUint8*)&aUdpEncapsPort );
+    
+    if ( aKeepAliveTimeout )
+        {
+        NatExtension.StoreParameter( NAT_KEEPALIVE_TIMEOUT,
+                                     2,
+                                     (TUint8*)&aKeepAliveTimeout );
+        }
+    
+    if ( aNAT_D_Flags & REMOTE_END_NAT )
+        {
+        NatExtension.StoreParameter( DESTINATION_ADDRESS,
+                                     sizeof(TInetAddr),
+                                     (TUint8*)&aDestinAddr );
+        }
+    
+    if ( aOriginalAddr.Family() != KAFUnspec )
+        {
+        NatExtension.StoreParameter( PEER_ORIGINAL_ADDRESS,
+                                     sizeof(TInetAddr),
+                                     (TUint8*)&aOriginalAddr );
+        }       
+    }