--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/natfw/natfwstunturnclient/src/natfwbindingimplementationbase.cpp	Tue Feb 02 01:04:58 2010 +0200
@@ -0,0 +1,225 @@
+/*
+* Copyright (c) 2006-2007 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:    
+*
+*/
+
+
+
+#include "natfwbindingimplementationbase.h"
+#include "mstunbindingobserver.h"
+#include "stunturnclientlogs.h"
+
+// ======== MEMBER FUNCTIONS ========
+
+const TReal KAlpha = 0.125;   // alpha = 1/8   RFC 2988
+const TReal KBeta = 0.25;     // beta = 1/4    RFC 2988
+
+const TReal KAlphaRemainder = 1 - KAlpha;  // 1 - alpha = 7/8 (0.875)   RFC 2988 2.3
+const TReal KBetaRemainder = 1 - KBeta;     // 1 - beta = 3/4 (0.75)  RFC 2988 2.3
+
+const TInt KRTTVARFactor = 4;  // RFC 2988 2.3
+
+
+// ---------------------------------------------------------------------------
+// Default constructor
+// ---------------------------------------------------------------------------
+//
+CBindingImplementation::CBindingImplementation( MSTUNBindingObserver& aClient,
+                                                CBinding& aBinding, 
+                                                RSocket& aSocket ) :
+    CSTUNTimerUser( aClient.TimerProvider() ),
+    iClient( &aClient ),    
+    iBinding( aBinding ),
+    iSocket( &aSocket ),
+    iDummyIP( KAFUnspec )
+    {
+    }
+
+// ---------------------------------------------------------------------------
+// Default constructor - overloaded
+// ---------------------------------------------------------------------------
+//
+CBindingImplementation::CBindingImplementation( MSTUNBindingObserver& aClient,
+                                        CBinding& aBinding,
+                                        TUint aStreamId,
+                                        TUint aConnectionId,
+                                        MNcmConnectionMultiplexer* aMux ) :
+    CSTUNTimerUser( aClient.TimerProvider() ),
+    iClient( &aClient ),
+    iBinding( aBinding ),
+    iStreamId( aStreamId ),
+    iConnectionId( aConnectionId ),
+    iMux( aMux ),
+    iDummyIP( KAFUnspec )
+    {
+    }
+    
+// ---------------------------------------------------------------------------
+// CBindingImplementation::SendRequestL
+// ---------------------------------------------------------------------------
+//
+void CBindingImplementation::SendRequestL()
+    {
+    User::Leave( KErrNotSupported );
+    }
+
+// ---------------------------------------------------------------------------
+// CBindingImplementation::SendRequestL
+// ---------------------------------------------------------------------------
+//
+void CBindingImplementation::SendRequestL( const TInetAddr& /*aDestAddr*/,
+                                           TBool /*aAddFingerprint*/,
+                                           TUint /*aRTvalue*/  )
+    {
+    User::Leave( KErrNotSupported );
+    }
+
+// ---------------------------------------------------------------------------
+// CBindingImplementation::AllocateRequestL
+// ---------------------------------------------------------------------------
+//
+void CBindingImplementation::AllocateRequestL( TUint /*aRtoValue*/ )
+    {
+    User::Leave( KErrNotSupported );
+    }
+
+// ---------------------------------------------------------------------------
+// CBindingImplementation::StoreAddressL
+// ---------------------------------------------------------------------------
+//
+void CBindingImplementation::StoreAddressL( 
+    const TInetAddr& /*ReflexiveAddr*/, const TInetAddr& /*aRelayAddr*/ )
+    {
+    User::Leave( KErrNotSupported );
+    }
+
+// ---------------------------------------------------------------------------
+// CBindingImplementation::RelayAddr
+// ---------------------------------------------------------------------------
+//
+const TInetAddr& CBindingImplementation::RelayAddr() const
+    {
+    return iDummyIP;
+    }
+
+// ---------------------------------------------------------------------------
+// CBindingImplementation::SetActiveDestinationRequestL
+// ---------------------------------------------------------------------------
+//
+void CBindingImplementation::SetActiveDestinationRequestL( 
+    const TInetAddr& /*aRemoteAddr*/, TUint32& /*aTimerValue*/ )
+    {
+    User::Leave( KErrNotSupported );
+    }
+    
+// ---------------------------------------------------------------------------
+// CBindingImplementation::ConnectRequestL
+// ---------------------------------------------------------------------------
+//
+void CBindingImplementation::ConnectRequestL( const TInetAddr& /*aRemoteAddr*/ )
+    {
+    User::Leave( KErrNotSupported );
+    }
+
+// ---------------------------------------------------------------------------
+// CBindingImplementation::NewRTTSampleMeasured
+// ---------------------------------------------------------------------------
+//
+void CBindingImplementation::NewRTTSampleMeasured( TInt64& aRTTSample,
+        TBool aRetransmitted )
+    {
+    __STUNTURNCLIENT( "CBindingImplementation::NewRTTSampleMeasured" )
+
+    if ( aRetransmitted )
+        {
+        // If segment was retransmitted use backed off RTO for next segment
+        iRetransmitInterval = I64INT( aRTTSample );
+        }
+    else
+        {
+        CalculateNewRTO( aRTTSample );
+        iRetransmitInterval = I64INT( iRTO );
+        }
+        
+    __STUNTURNCLIENT_INT1( "CBindingImplementation::NewRTTSampleMeasured - iRetransmitInterval:", iRetransmitInterval )                  
+    }
+
+// -----------------------------------------------------------------------------
+// CBindingImplementation::CalculateNewRTO
+// -----------------------------------------------------------------------------
+//
+void CBindingImplementation::CalculateNewRTO( TInt64& aRTTSample )
+    {
+    __STUNTURNCLIENT( "CBindingImplementation::RemoveAddress" )
+
+    __STUNTURNCLIENT_INT1( "CBindingImplementation::CalculateNewRTO - New RTT Sample:", aRTTSample )
+    __STUNTURNCLIENT_INT1( "CBindingImplementation::CalculateNewRTO - current iRTTVAR:", iRTTVAR )
+    __STUNTURNCLIENT_INT1( "CBindingImplementation::CalculateNewRTO - current iSRTT:", iSRTT )
+    __STUNTURNCLIENT_INT1( "CBindingImplementation::CalculateNewRTO - current iRTO:", iRTO ) 
+    
+    if ( iFirstRTOCalculated )
+        {
+        /* 
+        RTTVAR <- (1 - beta) * RTTVAR + beta * |SRTT - R'|
+        SRTT <- (1 - alpha) * SRTT + alpha * R'
+        RTO <- SRTT + max (G, K*RTTVAR) 
+        */
+              
+        TInt64 diff = Abs( iSRTT - aRTTSample );
+        
+        iRTTVAR = TInt64( ( KBetaRemainder * iRTTVAR ) + ( KBeta * diff ) );
+        
+        iSRTT = TInt64( ( KAlphaRemainder * iSRTT ) + ( KAlpha * aRTTSample ) );
+        
+        // rfc2988 if the K*RTTVAR term in the RTO calculation equals zero,
+        // the variance term MUST be rounded to G seconds
+        TInt64 rttvar( 0 );
+        rttvar = ( 0 == iRTTVAR ) ? 1 : iRTTVAR;
+                
+        iRTO = iSRTT + ( KRTTVARFactor * rttvar );        
+        }
+    else
+        {       
+        /*    
+        (2.2) When the first RTT measurement R is made
+        SRTT <- R
+        RTTVAR <- R/2
+        RTO <- SRTT + max (G, K*RTTVAR)     
+        */
+        
+        iSRTT = aRTTSample;     
+        iRTTVAR = aRTTSample / TInt64( 2 );      
+        iRTO = iSRTT + ( TInt64( 4 ) * iRTTVAR );
+        
+        iFirstRTOCalculated = ETrue;
+        }
+    __STUNTURNCLIENT_INT1( "CBindingImplementation::CalculateNewRTO - new iRTTVAR:", iRTTVAR )
+    __STUNTURNCLIENT_INT1( "CBindingImplementation::CalculateNewRTO - new iSRTT:", iSRTT )
+    __STUNTURNCLIENT_INT1( "CBindingImplementation::CalculateNewRTO - new iRTO:", iRTO ) 
+    }
+
+
+// -----------------------------------------------------------------------------
+// CBindingImplementation::CancelRetransmission
+// -----------------------------------------------------------------------------
+//
+void CBindingImplementation::CancelRetransmission()
+    {
+    return;
+    }
+
+
+// End of file
+