// Copyright (c) 2003-2009 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:

// The implementation of the hungry nif (based on the dummy nif)

// 

//

#include "hungrynif.h"

#include <es_mbuf.h>

/**

 * IPv4 interface binder class

 */

CHungryIf4::CHungryIf4(CHungryIfLink& aLink) : CDummyIf4(aLink)

	{

	CDummyIfLog::Printf(_L("CHungryIf4::CHungryIf4()"));

	// generate my local ip address (ip4) - will overwrite that generated in CDummyIf

	iLocalAddressBase = KHungryNifLocalAddressBase; // also used later in control method

	iLocalAddress = iLocalAddressBase + ((TUint32)this)%255;

	iIfName.Format(_L("hungrynif[0x%08x]"), this);

	}

void CHungryIf4::Recv(RMBufChain& aPdu)

	{

	// the whole idea of this nif is that it swallows packets for them never 

	// to be seen again, hence do nothing here :-)

	// except... want the stack to take ownership of the packet so we don't get a 

	// panic, break pckt first by changing the checksum so it doesn't make it thru

	// the whole stack - presumably the stack destroys it

	//

	// Later Note: it is also possible to just do aPdu.Free() (as in IPv6 binder).

	// However, this may change the timing as it would be much faster and may

	// cause sensitive tests to be re-worked if they fail as a result.

	TInet6HeaderIP4* ip4 = (TInet6HeaderIP4*) aPdu.First()->Next()->Ptr();

	if ((TUint)ip4->Protocol() == KProtocolInetUdp)

		{

		TInet6HeaderUDP* udp = (TInet6HeaderUDP*) ip4->EndPtr();

		CDummyIfLog::Printf(_L("CHungryIf4::Recv(...): UDP length %d, src port %d, dst port %d"),

			udp->Length(), udp->SrcPort(), udp->DstPort());

		}

	else

		CDummyIfLog::Printf(_L("CHungryIf4::Recv(...): IPv4 length %d, protocol %d"),

			ip4->TotalLength(), ip4->Protocol());

	// zero should be fine... assuming not zero already!

	TInt checksum = ip4->Checksum();

	if (checksum != 0)

		ip4->SetChecksum(0);

	else

		ip4->SetChecksum(1); // some other value

	iProtocol->Process(aPdu, (CProtocolBase*)this);

	}

/*

 * The link class

 */

CHungryIfLink::CHungryIfLink(CNifIfFactory& aFactory)

	: CDummyIfLink(aFactory)

	{}

CNifIfBase* CHungryIfLink::GetBinderL(const TDesC& aName)

	{

	CDummyIfLog::Printf(_L("CHungryIfLink::GetBinderL(%S)"), &aName);

	_LIT(KDescIp6, "ip6");

	if (aName.CompareF(KDescIp6) == 0)

		{

		iNifIf6 = new(ELeave) CHungryIf6(*this);

		return iNifIf6;

		}

	else

		{	// ip4

		iNifIf4 = new(ELeave) CHungryIf4(*this);

		return iNifIf4;

		}

	}