This class handles duplicate detection and recomposition of fragments. More...
#include "mac-rx-middle.h"
Public Types | |
typedef Callback< void, Ptr< const WifiMpdu >, uint8_t > | ForwardUpCallback |
typedef for callback | |
Public Member Functions | |
MacRxMiddle () | |
~MacRxMiddle () | |
void | Receive (Ptr< const WifiMpdu > mpdu, uint8_t linkId) |
Receive an MPDU on the given link. | |
void | SetForwardCallback (ForwardUpCallback callback) |
Set a callback to forward the packet up. | |
Public Member Functions inherited from ns3::SimpleRefCount< MacRxMiddle > | |
SimpleRefCount () | |
Default constructor. | |
SimpleRefCount (const SimpleRefCount &o) | |
Copy constructor. | |
uint32_t | GetReferenceCount () const |
Get the reference count of the object. | |
SimpleRefCount & | operator= (const SimpleRefCount &o) |
Assignment operator. | |
void | Ref () const |
Increment the reference count. | |
void | Unref () const |
Decrement the reference count. | |
Private Types | |
typedef std::map< Mac48Address, OriginatorRxStatus *, std::less< Mac48Address > > | Originators |
typedef for a map between address and OriginatorRxStatus | |
typedef std::map< Mac48Address, OriginatorRxStatus *, std::less< Mac48Address > >::iterator | OriginatorsI |
typedef for an iterator for Originators | |
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 | |
typedef std::map< std::pair< Mac48Address, uint8_t >, OriginatorRxStatus *, std::less< std::pair< Mac48Address, uint8_t > > >::iterator | QosOriginatorsI |
typedef for an iterator for QosOriginators | |
Private Member Functions | |
Ptr< const Packet > | HandleFragments (Ptr< const Packet > packet, const WifiMacHeader *hdr, OriginatorRxStatus *originator) |
Check if the received packet is a fragment and handle it appropriately. | |
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). | |
OriginatorRxStatus * | Lookup (const WifiMacHeader *hdr) |
Look up for OriginatorRxStatus associated with the sender address (by looking at ADDR2 field in the header). | |
Private Attributes | |
ForwardUpCallback | m_callback |
forward up callback | |
Originators | m_originatorStatus |
originator status | |
QosOriginators | m_qosOriginatorStatus |
QOS originator status. | |
Friends | |
class | MacRxMiddleTest |
allow MacRxMiddleTest associated class access | |
This class handles duplicate detection and recomposition of fragments.
Definition at line 42 of file mac-rx-middle.h.
typedef Callback<void, Ptr<const WifiMpdu>, uint8_t > ns3::MacRxMiddle::ForwardUpCallback |
typedef for callback
Definition at line 48 of file mac-rx-middle.h.
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typedef for a map between address and OriginatorRxStatus
Definition at line 114 of file mac-rx-middle.h.
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typedef for an iterator for Originators
Definition at line 126 of file mac-rx-middle.h.
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typedef for a map between address, OriginatorRxStatus, and Traffic ID
Definition at line 121 of file mac-rx-middle.h.
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typedef for an iterator for QosOriginators
Definition at line 132 of file mac-rx-middle.h.
ns3::MacRxMiddle::MacRxMiddle | ( | ) |
Definition at line 162 of file mac-rx-middle.cc.
References NS_LOG_FUNCTION_NOARGS.
ns3::MacRxMiddle::~MacRxMiddle | ( | ) |
Definition at line 167 of file mac-rx-middle.cc.
References m_originatorStatus, m_qosOriginatorStatus, and NS_LOG_FUNCTION_NOARGS.
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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.
packet | the packet |
hdr | the MAC header |
originator | the packet originator status |
Definition at line 230 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::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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Check if we have already received the packet from the sender before (by looking at the sequence control field).
hdr | the MAC header |
originator | the packet originator status |
Definition at line 223 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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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.
hdr | the MAC header |
Definition at line 190 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().
Receive an MPDU on the given link.
mpdu | the MPDU |
linkId | the ID of the given link |
The check below is really unneeded 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 290 of file mac-rx-middle.cc.
References ns3::WifiMacHeader::GetAddr1(), ns3::WifiMacHeader::GetAddr2(), ns3::WifiMacHeader::GetFragmentNumber(), ns3::OriginatorRxStatus::GetLastSequenceControl(), 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, NS_LOG_FUNCTION, and ns3::OriginatorRxStatus::SetSequenceControl().
void ns3::MacRxMiddle::SetForwardCallback | ( | ForwardUpCallback | callback | ) |
Set a callback to forward the packet up.
callback | the callback to set |
Definition at line 183 of file mac-rx-middle.cc.
References m_callback, and NS_LOG_FUNCTION_NOARGS.
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allow MacRxMiddleTest associated class access
Definition at line 70 of file mac-rx-middle.h.
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forward up callback
Definition at line 136 of file mac-rx-middle.h.
Referenced by Receive(), and SetForwardCallback().
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originator status
Definition at line 134 of file mac-rx-middle.h.
Referenced by ~MacRxMiddle(), and Lookup().
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QOS originator status.
Definition at line 135 of file mac-rx-middle.h.
Referenced by ~MacRxMiddle(), and Lookup().