// Copyright (c) 2004-2009 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:

// icmp_sap.cpp - ICMP service access point

//

#include "icmp6.h"

#include <icmp6_hdr.h>

#include <in_pkt.h>

#include <in_chk.h>

#include "in_net.h"

//

class CProviderICMP6 : public CProviderInet6Network

	{

public:

	CProviderICMP6(CProtocolInet6Base* aProtocol, TInt aProtocolId);

	virtual TInt DoWrite(RMBufSendPacket &aPacket, RMBufSendInfo &aInfo, TUint aOptions, TUint aOffset);

	virtual TInt SetLocalName(TSockAddr &aAddr);

	virtual TInt SecurityCheck(MProvdSecurityChecker *aChecker);

	};

CServProviderBase *ICMP6::NewSAPL(TUint aSockType, CProtocolInet6Base *aProtocol, TInt aId)

	{

	LOG(Log::Printf(_L("NewSAPL\t%S SockType=%d"), &aProtocol->ProtocolName(), aSockType));

	if (aSockType != KSockDatagram)

		User::Leave(KErrNotSupported);

	CProviderICMP6 *provider = new (ELeave) CProviderICMP6(aProtocol, aId);

	CleanupStack::PushL(provider);

	provider->InitL();

	CleanupStack::Pop();

	LOG(Log::Printf(_L("NewSAPL\t%S SAP[%u] OK"), &aProtocol->ProtocolName(), (TInt)provider));

	return provider;

	}

//

CProviderICMP6::CProviderICMP6(CProtocolInet6Base* aProtocol, TInt aProtocolId) :

	CProviderInet6Network(aProtocol)

	{

	__DECLARE_NAME(_S("CProviderICMP6"));

	iProtocolId = aProtocolId;	// either ICMPv4 or ICMPv6 id

	}

TInt CProviderICMP6::DoWrite(RMBufSendPacket &aPacket, RMBufSendInfo &aInfo, TUint /*aOptions*/, TUint aOffset)

	{

	TInet6Checksum<TInet6HeaderICMP> icmp(aPacket, aOffset);

	if (icmp.iHdr == NULL)

		return KErrInet6ShortPacket;

	iFlow.SetIcmpType(icmp.iHdr->Type(), icmp.iHdr->Code());

	iFlow.SetNotify(this);

	if (aInfo.iSrcAddr.Family())

		iFlow.SetLocalAddr(aInfo.iSrcAddr);

	if (aInfo.iDstAddr.Family())

		iFlow.SetRemoteAddr(aInfo.iDstAddr);

	const TInt status = aInfo.iFlow.Open(iFlow, &aInfo);

	if (status == KErrNone)

		{

		// Compute the checksum here. This means that currently

		// the application cannot compute the checksum into

		// ICMP header. This may be a drawback for some situations

		// and perhaps some flag is introduced later -- msa

		//

		// IPv4 ICMP checksum does not use "pseudoheader" => pass NULL for info when IPv4!

		icmp.ComputeChecksum(aPacket, iProtocolId == STATIC_CAST(TInt, KProtocolInetIcmp) ? NULL : &aInfo, aOffset);

		}

	return status;

	}

//

// Need to override the network SetLocalName because by default

// the network deliver filters by the port number (compared to

// the protocol number).

//

TInt CProviderICMP6::SetLocalName(TSockAddr &aAddr)

	{

	// To prevent accidental non-zero values of port messing things up,

	// make sure the local port field is zero before doing the bind.

	//

	aAddr.SetPort(0);

	return CProviderInet6Network::SetLocalName(aAddr);

	}

// For now, require network control from ICMP sockets, because they

// also see all incoming ICMP's, including any bounced packets from

// other applications.

TInt CProviderICMP6::SecurityCheck(MProvdSecurityChecker *aChecker)

	{

	const TInt res = CProviderInet6Network::SecurityCheck(aChecker);

	if (res == KErrNone)

		return CheckPolicy(KPolicyNetworkControl, "TCPIP ICMP SAP");

	return res;

	}