/*

* Copyright (c) 2007-2008 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 <ip6_hdr.h>

#include <icmp6_hdr.h>

#include <udp_hdr.h>

#include <ext_hdr.h>

#include <in_sock.h>

#include "ncmconnectionmultiplexerlogs.h"

#include "cncmicmpv6receiver.h"

#include "mncmicmpobserver.h"

#include "cncmicmpsender.h"

// -----------------------------------------------------------------------------

// CNcmIcmpV6Receiver::NewL

// -----------------------------------------------------------------------------

//

CNcmIcmpV6Receiver* CNcmIcmpV6Receiver::NewL( RSocketServ& aServer,

    RConnection& aConnection, MNcmIcmpObserver& aObserver )

    {

    CNcmIcmpV6Receiver* self =

        new ( ELeave ) CNcmIcmpV6Receiver( aServer, aConnection, aObserver );

    CleanupStack::PushL( self );

    self->ConstructL();

    CleanupStack::Pop( self );

    return self;

    }

// -----------------------------------------------------------------------------

// CNcmIcmpV6Receiver::CNcmIcmpV6Receiver

// -----------------------------------------------------------------------------

//

CNcmIcmpV6Receiver::CNcmIcmpV6Receiver( RSocketServ& aServer,

    RConnection& aConnection, MNcmIcmpObserver& aObserver ) :

    CActive( CActive::EPriorityStandard ),

    iServer( aServer ),

    iConnection( aConnection ),

    iObserver( aObserver )

    {

    CActiveScheduler::Add( this );

    }

// -----------------------------------------------------------------------------

// CNcmIcmpV6Receiver::ConstructL

// -----------------------------------------------------------------------------

//

void CNcmIcmpV6Receiver::ConstructL()

    {

    User::LeaveIfError( iSocket.Open(

        iServer, KAfInet, KSockDatagram, KProtocolInet6Icmp, iConnection ) );

    iIcmpSender = CNcmIcmpSender::NewL( iSocket );

    Receive();

    }

// -----------------------------------------------------------------------------

// CNcmIcmpV6Receiver::~CNcmIcmpV6Receiver

// -----------------------------------------------------------------------------

//

CNcmIcmpV6Receiver::~CNcmIcmpV6Receiver()

    {

    Cancel();

    delete iIcmpSender;

    iSocket.Close();

    }

// -----------------------------------------------------------------------------

// CNcmIcmpV6Receiver::RunL

// -----------------------------------------------------------------------------

//

void CNcmIcmpV6Receiver::RunL()

    {

    if ( iStatus == KErrNone )

        {

        CheckError();

        Receive();

        }

    }

// -----------------------------------------------------------------------------

// CNcmIcmpV6Receiver::CheckError

// -----------------------------------------------------------------------------

//

void CNcmIcmpV6Receiver::CheckError()

    {

    const TUint KDestinationUnreachable = 1;

    // Pointer to ICMP header

    TInet6HeaderICMP* icmpPtr( ( TInet6HeaderICMP* ) iData.Ptr() );

    // Pointer to IPv6 header

    const TInt KIPHeaderOffset = 8;

    TInet6HeaderIP* ipv6Ptr =

        ( TInet6HeaderIP* )( iData.Ptr() + KIPHeaderOffset );

    // Get the whole length of the header in bytes

    TUint32 payloadLength( ipv6Ptr->PayloadLength() );

    TUint32 offset( 0 );

    // Pointer to IPv6 extension header

    const TInt KHeaderExtensionOffset = 14;

    TInet6HeaderExtension* extPtr =

        ( TInet6HeaderExtension* )( iData.Ptr() + KHeaderExtensionOffset );

    // Get the extension header length in bytes

    TUint32 extHdrLength( extPtr->HeaderLength() );

    // Pointer to UDP data

    TInet6HeaderUDP* udpPtr = ( TInet6HeaderUDP* )( ipv6Ptr->EndPtr() );

    // Error message type

    TUint32 error( icmpPtr->Type() );

    if ( KDestinationUnreachable == error )

        {

        TUint32 nextHeader( 0 );

        do  // Search the correct header, if there are extension headers

            {

            nextHeader = extPtr->NextHeader();

            if( KProtocolInetUdp == nextHeader )

                {

                // Get the destination port number

                iAddress.SetPort( udpPtr->DstPort() );

                // Set the destination address

                iAddress.SetAddress( ipv6Ptr->DstAddr() );

                __CONNECTIONMULTIPLEXER_INT1(

                    "CNcmIcmpV6Receiver::CheckError - ICMP error:", error )

                __CONNECTIONMULTIPLEXER_ADDRLOG(

                    " CNcmIcmpV6Receiver::CheckError - DstAddr:", iAddress )

                TInetAddr localAddress;

                TInetAddr remoteAddress;

                iObserver.IcmpError( iAddress, localAddress, remoteAddress );

                if ( !( remoteAddress.IsUnspecified() ||

                    localAddress.IsUnspecified() ) )

                    {

                    udpPtr->SetDstPort( localAddress.Port() );

                    udpPtr->SetSrcPort( remoteAddress.Port() );

                    TInetAddr local( localAddress.Address() );

                    local.ConvertToV4Mapped();

                    ipv6Ptr->SetDstAddr( local.Ip6Address() );

                    TInetAddr remote( remoteAddress.Address() );

                    local.ConvertToV4Mapped();

                    ipv6Ptr->SetSrcAddr( remote.Ip6Address() );

                    iIcmpSender->Send( iData, remoteAddress );

                    }

                }

            else

                {

                // Step to next header

                if ( offset < payloadLength )

                    {

                    extPtr = extPtr + extHdrLength;

                    offset = offset + extHdrLength;

                    }

                }

            // Loop until UDP datagram is found. If it is not found,

            // get out of here and do nothing.

            } while ( ( KProtocolInetUdp != nextHeader ) &&

                      ( offset < payloadLength ) );

        }

    }

// -----------------------------------------------------------------------------

// CNcmIcmpV6Receiver::DoCancel

// -----------------------------------------------------------------------------

//

void CNcmIcmpV6Receiver::DoCancel()

    {

    iSocket.CancelRecv();

    }

// -----------------------------------------------------------------------------

// CNcmIcmpV6Receiver::Receive

// -----------------------------------------------------------------------------

//

void CNcmIcmpV6Receiver::Receive()

    {

    if ( !IsActive() )

        {

        iSocket.Recv( iData, 0, iStatus );

        SetActive();

        }

    }