tcpiputils/dhcp/src/DHCPIP6MsgSender.cpp
author hgs
Tue, 29 Jun 2010 19:20:22 +0530
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permissions -rw-r--r--
201025_01
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// Copyright (c) 2004-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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// Implements the Message sender DHCPIP6 specific access functthat fustions 
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// resends messages until max retry or max count has been reached..
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// 
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//
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/**
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 @file DHCPIP6MsgSender.cpp
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 @internalTechnology
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*/
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#include "DHCPServer.h"
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#include "DHCPIP6MsgSender.h"
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#include "DhcpIP6Msg.h"
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#include <in_sock.h>
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#include <es_sock.h>
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/*
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the retransmition alg recomended by RFC3315 (DHCPv6). Could be used for DHCPv4 as well
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for DHPCv4 doesn't specify anything
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   RT for the first message transmission is based on IRT:
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      RT = IRT + RAND*IRT
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   RT for each subsequent message transmission is based on the previous
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   value of RT:
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      RT = 2*RTprev + RAND*RTprev
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   MRT specifies an upper bound on the value of RT (disregarding the
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   randomisation added by the use of RAND).  If MRT has a value of 0,
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   there is no upper limit on the value of RT.  Otherwise:
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      if (RT > MRT)
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     RT = MRT + RAND*MRT
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*/
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TBool CDHCPIP6MessageSender::SendingContinues() const
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/**
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  * determines whether to continue the sending
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  *
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  * 
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  * @internalTechnology
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  *
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  */
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	{
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	if ( iRetryCount )
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		{//EElapsedTime option MUST be the first option in the option part of the message
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		//see CDHCPIP6StateMachine::SetMessageHeader fn
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		TUint32 elapsedHundrOfSecs = iMicroSecs.Int() / KMicrosecondsInSecs * 100;
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		TUint8* elapsedOptionBody = const_cast<TUint8*>(iMsg->Des().Ptr()) + DHCPv6::KDHCPHeaderLength + DHCPv6::KOptionHeaderLength;
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		TUint32 current = TBigEndian::GetValue( elapsedOptionBody, DHCPv6::KElapsedTimeOptionLen );
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		TBigEndian::SetValue( elapsedOptionBody, DHCPv6::KElapsedTimeOptionLen, current + elapsedHundrOfSecs );
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		}
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	return iRetryCount < iMaxRetryCount && iRetryDuration < iMaxRetryDuration;
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	}
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TBool CDHCPIP6MessageSender::CalculateDelay()
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/**
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  * Calculates the first and the next retransmition time. Returns ETrue is the time calculated
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  * is greater than zero.
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  *
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  * @internalTechnology
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  *
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  */
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    {
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    if ( iRetryCount > -1 )
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        {
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        TInt ms = iMicroSecs.Int();
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        ms = iInitialRetryTimeout ? iInitialRetryTimeout : ms + 2*ms + iXid.Rnd( -ms/10, ms/10 );
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        if ( ms > iMaxRetryTimeout || ms <= 0 )
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            {
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            ms = iMaxRetryTimeout + iXid.Rnd( -iMaxRetryTimeout/10, iMaxRetryTimeout/10 );
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            }
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        iInitialRetryTimeout = 0;
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        iMicroSecs = ms;
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        }
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    else
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        {//msg to be send for the first time
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        iMicroSecs = iXid.Rnd( 0, iFirstSendDelay );
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        }
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    return iMicroSecs.Int() > 0;    
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    }
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void CDHCPIP6MessageSender::SetListener( MMSListener* aMMSListener )
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   {
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   iMMSListener = aMMSListener;
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   }
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MMSListener* CDHCPIP6MessageSender::EventListener() const
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   {
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   return iMMSListener;
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   }
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void CDHCPIP6MessageSender::SetInitialRetryTimeout( TInt aSeconds )
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   {
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   iInitialRetryTimeout = KMicrosecondsInSecs * aSeconds;
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   }
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void CDHCPIP6MessageSender::SetMaxRetryTimeout( TInt aSeconds )
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   {
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   iMaxRetryTimeout = KMicrosecondsInSecs * aSeconds;
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   }
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void CDHCPIP6MessageSender::SetMaxRetryCount( TInt aCount )
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   {
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   iMaxRetryCount = aCount;
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   }
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void CDHCPIP6MessageSender::SetMaxRetryDuration( TInt aSeconds )
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   {
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   iMaxRetryDuration = KMicrosecondsInSecs * aSeconds;
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   }
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void CDHCPIP6MessageSender::SetFirstSendDelay( TInt aSeconds )
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   {
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   iFirstSendDelay = KMicrosecondsInSecs * aSeconds;
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   }