This class handles duplicate detection and recomposition of fragments. More...

#include "mac-rx-middle.h"

Inheritance diagram for ns3::MacRxMiddle:

Collaboration diagram for ns3::MacRxMiddle:

Public Types
typedef Callback< void, Ptr< Packet >, const WifiMacHeader * >	ForwardUpCallback
	typedef for callback More...

Public Member Functions
	MacRxMiddle ()

	~MacRxMiddle ()

void	Receive (Ptr< Packet > packet, const WifiMacHeader *hdr)
	Receive a packet. More...

void	SetForwardCallback (ForwardUpCallback callback)
	Set a callback to forward the packet up. More...

Public Member Functions inherited from ns3::SimpleRefCount< MacRxMiddle >
	SimpleRefCount ()
	Default constructor. More...

	SimpleRefCount (const SimpleRefCount &o)
	Copy constructor. More...

uint32_t	GetReferenceCount (void) const
	Get the reference count of the object. More...

SimpleRefCount &	operator= (const SimpleRefCount &o)
	Assignment operator. More...

void	Ref (void) const
	Increment the reference count. More...

void	Unref (void) const
	Decrement the reference count. More...

Private Types
typedef std::map< Mac48Address, OriginatorRxStatus *, std::less< Mac48Address > >	Originators
	typedef for a map between address and OriginatorRxStatus More...

typedef std::map< Mac48Address, OriginatorRxStatus *, std::less< Mac48Address > >::iterator	OriginatorsI
	typedef for an interator for Originators More...

typedef std::map< std::pair< Mac48Address, uint8_t >, OriginatorRxStatus *, std::less< std::pair< Mac48Address, uint8_t > > >	QosOriginators
	typedef for a map between address, OriginatorRxStatus, and Traffic ID More...

typedef std::map< std::pair< Mac48Address, uint8_t >, OriginatorRxStatus *, std::less< std::pair< Mac48Address, uint8_t > > >::iterator	QosOriginatorsI
	typedef for an interator for QosOriginators More...

Private Member Functions
Ptr< Packet >	HandleFragments (Ptr< Packet > packet, const WifiMacHeader hdr, OriginatorRxStatus originator)
	Check if the received packet is a fragment and handle it appropriately. More...

bool	IsDuplicate (const WifiMacHeader hdr, OriginatorRxStatus originator) const
	Check if we have already received the packet from the sender before (by looking at the sequence control field). More...

OriginatorRxStatus *	Lookup (const WifiMacHeader *hdr)
	Look up for OriginatorRxStatus associated with the sender address (by looking at ADDR2 field in the header). More...

Private Attributes
ForwardUpCallback	m_callback
	forward up callback More...

Originators	m_originatorStatus
	originator status More...

QosOriginators	m_qosOriginatorStatus
	QOS originator status. More...

Friends
class	MacRxMiddleTest
	allow MacRxMiddleTest associated class access More...

Detailed Description

This class handles duplicate detection and recomposition of fragments.

Definition at line 38 of file mac-rx-middle.h.

Member Typedef Documentation

typedef Callback<void, Ptr<Packet>, const WifiMacHeader*> ns3::MacRxMiddle::ForwardUpCallback

typedef for callback

Definition at line 44 of file mac-rx-middle.h.

typedef std::map<Mac48Address, OriginatorRxStatus *, std::less<Mac48Address> > ns3::MacRxMiddle::Originators

private

typedef for a map between address and OriginatorRxStatus

Definition at line 110 of file mac-rx-middle.h.

typedef std::map<Mac48Address, OriginatorRxStatus *, std::less<Mac48Address> >::iterator ns3::MacRxMiddle::OriginatorsI

private

typedef for an interator for Originators

Definition at line 118 of file mac-rx-middle.h.

typedef std::map<std::pair<Mac48Address, uint8_t>, OriginatorRxStatus *, std::less<std::pair<Mac48Address,uint8_t> > > ns3::MacRxMiddle::QosOriginators

private

typedef for a map between address, OriginatorRxStatus, and Traffic ID

Definition at line 114 of file mac-rx-middle.h.

typedef std::map<std::pair<Mac48Address, uint8_t>, OriginatorRxStatus *, std::less<std::pair<Mac48Address,uint8_t> > >::iterator ns3::MacRxMiddle::QosOriginatorsI

private

typedef for an interator for QosOriginators

Definition at line 122 of file mac-rx-middle.h.

Constructor & Destructor Documentation

ns3::MacRxMiddle::MacRxMiddle ( )

Definition at line 160 of file mac-rx-middle.cc.

References NS_LOG_FUNCTION_NOARGS.

ns3::MacRxMiddle::~MacRxMiddle ( )

Definition at line 165 of file mac-rx-middle.cc.

References m_originatorStatus, m_qosOriginatorStatus, and NS_LOG_FUNCTION_NOARGS.

Member Function Documentation

Ptr< Packet > ns3::MacRxMiddle::HandleFragments	(	Ptr< Packet >	packet,
		const WifiMacHeader *	hdr,
		OriginatorRxStatus *	originator
	)

private

Check if the received packet is a fragment and handle it appropriately.

If the packet is not a fragment, the method returns the packet. If the packet is a fragment (not the last fragment), the method initiates de-fragmentation process and return 0. If the packet is the last fragment, the method tries to re-construct the full packet and return the packet if success.

Parameters

packet
hdr
originator

Returns: a packet if the packet is successfully reassembled (or not a fragment), 0 if we failed to reassemble the packet (e.g. missing fragments/out-of-order).

Definition at line 239 of file mac-rx-middle.cc.

References ns3::OriginatorRxStatus::AccumulateFirstFragment(), ns3::OriginatorRxStatus::AccumulateFragment(), ns3::OriginatorRxStatus::AccumulateLastFragment(), ns3::WifiMacHeader::GetFragmentNumber(), ns3::WifiMacHeader::GetSequenceControl(), ns3::WifiMacHeader::GetSequenceNumber(), ns3::Packet::GetSize(), ns3::WifiMacHeader::GetSize(), ns3::OriginatorRxStatus::IsDeFragmenting(), ns3::WifiMacHeader::IsMoreFragments(), ns3::OriginatorRxStatus::IsNextFragment(), NS_LOG_DEBUG, NS_LOG_FUNCTION, and ns3::OriginatorRxStatus::SetSequenceControl().

Referenced by Receive().

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bool ns3::MacRxMiddle::IsDuplicate	(	const WifiMacHeader *	hdr,
		OriginatorRxStatus *	originator
	)		const

private

Check if we have already received the packet from the sender before (by looking at the sequence control field).

Parameters

hdr
originator

Returns: true if we already received the packet previously, false otherwise

Definition at line 226 of file mac-rx-middle.cc.

References ns3::OriginatorRxStatus::GetLastSequenceControl(), ns3::WifiMacHeader::GetSequenceControl(), ns3::WifiMacHeader::IsRetry(), and NS_LOG_FUNCTION.

Referenced by Receive().

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OriginatorRxStatus * ns3::MacRxMiddle::Lookup ( const WifiMacHeader * hdr )

private

Look up for OriginatorRxStatus associated with the sender address (by looking at ADDR2 field in the header).

The method creates a new OriginatorRxStatus if one is not already presented.

Parameters

hdr

Returns: OriginatorRxStatus

Definition at line 192 of file mac-rx-middle.cc.

References ns3::WifiMacHeader::GetAddr2(), ns3::WifiMacHeader::GetQosTid(), ns3::Mac48Address::IsGroup(), ns3::WifiMacHeader::IsQosData(), m_originatorStatus, m_qosOriginatorStatus, and NS_LOG_FUNCTION.

Referenced by Receive().

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void ns3::MacRxMiddle::Receive	(	Ptr< Packet >	packet,
		const WifiMacHeader *	hdr
	)

Receive a packet.

Parameters

packet	the packet
hdr	MAC header

The check below is really uneeded because it can fail in a lot of normal cases. Specifically, it is possible for sequence numbers to loop back to zero once they reach 0xfff0 and to go up to 0xf7f0 in which case the check below will report the two sequence numbers to not have the correct order relationship. So, this check cannot be used to discard old duplicate frames. It is thus here only for documentation purposes.

Definition at line 298 of file mac-rx-middle.cc.

References ns3::WifiMacHeader::GetAddr1(), ns3::WifiMacHeader::GetAddr2(), ns3::WifiMacHeader::GetFragmentNumber(), ns3::WifiMacHeader::GetSequenceControl(), ns3::WifiMacHeader::GetSequenceNumber(), HandleFragments(), ns3::WifiMacHeader::IsData(), IsDuplicate(), ns3::Mac48Address::IsGroup(), ns3::WifiMacHeader::IsMgt(), Lookup(), m_callback, NS_ASSERT, NS_LOG_DEBUG, and NS_LOG_FUNCTION.