22 #ifndef TCP_TX_BUFFER_H 23 #define TCP_TX_BUFFER_H 25 #include "ns3/object.h" 26 #include "ns3/traced-value.h" 27 #include "ns3/sequence-number.h" 28 #include "ns3/tcp-option-sack.h" 29 #include "ns3/tcp-tx-item.h" 155 uint32_t
Size (
void)
const;
564 bool *listEdited =
nullptr)
const;
600 std::pair <TcpTxBuffer::PacketList::const_iterator, SequenceNumber32>
Callback< uint32_t > m_rWndCallback
Callback to obtain RCV.WND value.
void AddRenoSack()
Emulate SACKs for SACKless connection: account for a new dupack.
uint32_t m_retrans
Number of retransmitted bytes.
bool m_sackEnabled
Indicates if SACK is enabled on this connection.
TcpTxItem * GetTransmittedSegment(uint32_t numBytes, const SequenceNumber32 &seq)
Get a block of data previously transmitted.
std::pair< TcpTxBuffer::PacketList::const_iterator, SequenceNumber32 > FindHighestSacked() const
Find the highest SACK byte.
void ResetLastSegmentSent()
Take the last segment sent and put it back into the un-sent list (at the beginning) ...
PacketList m_appList
Buffer for application data.
uint32_t m_lostOut
Number of lost bytes.
std::list< SackBlock > SackList
SACK list definition.
uint32_t GetRetransmitsCount(void) const
Return the number of segments in the sent list that have been transmitted more than once...
void DeleteRetransmittedFlagFromHead()
DeleteRetransmittedFlagFromHead.
void RemoveFromCounts(TcpTxItem *item, uint32_t size)
Remove the size specified from the lostOut, retrans, sacked count.
std::ostream & operator<<(std::ostream &os, const Angles &a)
void UpdateLostCount()
Update the lost count.
bool IsSackEnabled(void) const
check whether SACK is used on the corresponding TCP socket
Item that encloses the application packet and some flags for it.
TracedValue< SequenceNumber32 > m_firstByteSeq
Sequence number of the first byte in data (SND.UNA)
uint32_t m_sentSize
Size of sent (and not discarded) segments.
void DiscardUpTo(const SequenceNumber32 &seq, const Callback< void, TcpTxItem *> &beforeDelCb=m_nullCb)
Discard data up to but not including this sequence number.
std::list< TcpTxItem * > PacketList
container for data stored in the buffer
void MergeItems(TcpTxItem *t1, TcpTxItem *t2) const
Merge two TcpTxItem.
uint32_t m_size
Size of all data in this buffer.
TcpTxItem * CopyFromSequence(uint32_t numBytes, const SequenceNumber32 &seq)
Copy data from the range [seq, seq+numBytes) into a packet.
void SetRWndCallback(Callback< uint32_t > rWndCallback)
Set callback to obtain receiver window value.
void ConsistencyCheck() const
Check if the values of sacked, lost, retrans, are in sync with the sent list.
void SetMaxBufferSize(uint32_t n)
Set the maximum buffer size.
uint32_t SizeFromSequence(const SequenceNumber32 &seq) const
Returns the number of bytes from the buffer in the range [seq, tailSequence)
void SetSentListLost(bool resetSack=false)
Set the entire sent list as lost (typically after an RTO)
std::pair< PacketList::const_iterator, SequenceNumber32 > m_highestSack
Highest SACK byte.
void ResetSentList()
Reset the sent list.
bool IsRetransmittedDataAcked(const SequenceNumber32 &ack) const
Checks whether the ack corresponds to retransmitted data.
uint32_t GetLost(void) const
Get the number of segments that we believe are lost in the network.
Every class exported by the ns3 library is enclosed in the ns3 namespace.
SequenceNumber32 TailSequence(void) const
Get the sequence number of the buffer tail (plus one)
bool Add(Ptr< Packet > p)
Append a data packet to the end of the buffer.
uint32_t m_sackedOut
Number of sacked bytes.
static TypeId GetTypeId(void)
Get the type ID.
void ResetRenoSack()
Reset the SACKs.
void SetDupAckThresh(uint32_t dupAckThresh)
Set the DupAckThresh.
SequenceNumber32 HeadSequence(void) const
Get the sequence number of the buffer head.
void MarkHeadAsLost()
Mark the head of the sent list as lost.
bool IsLostRFC(const SequenceNumber32 &seq, const PacketList::const_iterator &segment) const
Decide if a segment is lost based on RFC 6675 algorithm.
TcpTxItem * GetPacketFromList(PacketList &list, const SequenceNumber32 &startingSeq, uint32_t numBytes, const SequenceNumber32 &requestedSeq, bool *listEdited=nullptr) const
Get a block (which is returned as Packet) from a list
void SetSegmentSize(uint32_t segmentSize)
Set the segment size.
void SplitItems(TcpTxItem *t1, TcpTxItem *t2, uint32_t size) const
Split one TcpTxItem.
uint32_t Size(void) const
Returns total number of bytes in this buffer.
uint32_t m_dupAckThresh
Duplicate Ack threshold from TcpSocketBase.
bool IsLost(const SequenceNumber32 &seq) const
Check if a segment is lost.
friend std::ostream & operator<<(std::ostream &os, TcpTxBuffer const &tcpTxBuf)
Output operator.
PacketList m_sentList
Buffer for sent (but not acked) data.
uint32_t BytesInFlightRFC() const
Calculate the number of bytes in flight per RFC 6675.
uint32_t Update(const TcpOptionSack::SackList &list, const Callback< void, TcpTxItem *> &sackedCb=m_nullCb)
Update the scoreboard.
uint32_t m_maxBuffer
Max number of data bytes in buffer (SND.WND)
uint32_t Available(void) const
Returns the available capacity of this buffer.
TcpTxItem * GetNewSegment(uint32_t numBytes)
Get a block of data not transmitted yet and move it into SentList.
void SetSackEnabled(bool enabled)
tell tx-buffer whether SACK is used on this TCP socket
uint32_t m_segmentSize
Segment size from TcpSocketBase.
bool NextSeg(SequenceNumber32 *seq, SequenceNumber32 *seqHigh, bool isRecovery) const
Get the next sequence number to transmit, according to RFC 6675.
A base class which provides memory management and object aggregation.
bool IsHeadRetransmitted() const
Check if the head is retransmitted.
TcpTxBuffer(uint32_t n=0)
Constructor.
virtual ~TcpTxBuffer(void)
bool m_renoSack
Indicates if AddRenoSack was called.
a unique identifier for an interface.
uint32_t MaxBufferSize(void) const
Get the maximum buffer size.
uint32_t GetSacked(void) const
Get the number of segments that have been explicitly sacked by the receiver.
uint32_t BytesInFlight() const
Return total bytes in flight.
static Callback< void, TcpTxItem * > m_nullCb
Null callback for an item.
void SetHeadSequence(const SequenceNumber32 &seq)
Set the head sequence of the buffer.