A Discrete-Event Network Simulator
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ns3::TcpSocketMsgBase Class Reference

Class for inserting callbacks special points of the flow of TCP sockets. More...

#include "tcp-general-test.h"

+ Inheritance diagram for ns3::TcpSocketMsgBase:
+ Collaboration diagram for ns3::TcpSocketMsgBase:

Public Types

typedef Callback< void, Ptr< const Packet >, const TcpHeader &, Ptr< const TcpSocketBase > > AckManagementCb
 Callback for the ACK management.
 
typedef Callback< void, Ptr< const TcpSocketState >, Ptr< const TcpSocketBase > > RetrCb
 Callback for the packet retransmission management.
 
typedef Callback< void, Ptr< const TcpSocketBase >, const SequenceNumber32 &, uint32_t, bool > UpdateRttCallback
 Callback for the RTT update management.
 
- Public Types inherited from ns3::TcpSocketBase
typedef void(* RetransmissionCallback) (const Ptr< const Packet > packet, const TcpHeader &header, const Address &localAddr, const Address &peerAddr, const Ptr< const TcpSocketBase > socket)
 TracedCallback signature for TCP packet retransmission events.
 
enum  TcpPacketType_t {
  SYN , SYN_ACK , PURE_ACK , WINDOW_PROBE ,
  FIN , RST , RE_XMT , DATA ,
  INVALID
}
 Tcp Packet Types. More...
 
typedef void(* TcpTxRxTracedCallback) (const Ptr< const Packet > packet, const TcpHeader &header, const Ptr< const TcpSocketBase > socket)
 TracedCallback signature for TCP packet transmission or reception events.
 
- Public Types inherited from ns3::TcpSocket
enum  TcpStates_t {
  CLOSED = 0 , LISTEN , SYN_SENT , SYN_RCVD ,
  ESTABLISHED , CLOSE_WAIT , LAST_ACK , FIN_WAIT_1 ,
  FIN_WAIT_2 , CLOSING , TIME_WAIT , LAST_STATE
}
 Names of the 11 TCP states. More...
 
- Public Types inherited from ns3::Socket
enum  Ipv6MulticastFilterMode { INCLUDE = 1 , EXCLUDE }
 Enumeration of the possible filter of a socket. More...
 
enum  SocketErrno {
  ERROR_NOTERROR , ERROR_ISCONN , ERROR_NOTCONN , ERROR_MSGSIZE ,
  ERROR_AGAIN , ERROR_SHUTDOWN , ERROR_OPNOTSUPP , ERROR_AFNOSUPPORT ,
  ERROR_INVAL , ERROR_BADF , ERROR_NOROUTETOHOST , ERROR_NODEV ,
  ERROR_ADDRNOTAVAIL , ERROR_ADDRINUSE , SOCKET_ERRNO_LAST
}
 Enumeration of the possible errors returned by a socket. More...
 
enum  SocketPriority {
  NS3_PRIO_BESTEFFORT = 0 , NS3_PRIO_FILLER = 1 , NS3_PRIO_BULK = 2 , NS3_PRIO_INTERACTIVE_BULK = 4 ,
  NS3_PRIO_INTERACTIVE = 6 , NS3_PRIO_CONTROL = 7
}
 Enumeration of the possible socket priorities. More...
 
enum  SocketType { NS3_SOCK_STREAM , NS3_SOCK_SEQPACKET , NS3_SOCK_DGRAM , NS3_SOCK_RAW }
 Enumeration of the possible socket types. More...
 

Public Member Functions

 TcpSocketMsgBase ()
 
 TcpSocketMsgBase (const TcpSocketMsgBase &other)
 Constructor.
 
void SetAfterRetransmitCb (RetrCb cb)
 Set the callback invoked after the processing of a retransmit timeout.
 
void SetBeforeRetransmitCb (RetrCb cb)
 Set the callback invoked before the processing of a retransmit timeout.
 
void SetForkCb (Callback< void, Ptr< TcpSocketMsgBase > > cb)
 Set the callback invoked after the forking.
 
void SetProcessedAckCb (AckManagementCb cb)
 Set the callback invoked when an ACK is received and processed (at the end of the processing)
 
void SetRcvAckCb (AckManagementCb cb)
 Set the callback invoked when an ACK is received (at the beginning of the processing)
 
void SetUpdateRttHistoryCb (UpdateRttCallback cb)
 Set the callback invoked when we update rtt history.
 
- Public Member Functions inherited from ns3::TcpSocketBase
 TcpSocketBase ()
 Create an unbound TCP socket.
 
 TcpSocketBase (const TcpSocketBase &sock)
 Clone a TCP socket, for use upon receiving a connection request in LISTEN state.
 
 ~TcpSocketBase () override
 
int Bind () override
 Allocate a local IPv4 endpoint for this socket.
 
int Bind (const Address &address) override
 Allocate a local endpoint for this socket.
 
int Bind6 () override
 Allocate a local IPv6 endpoint for this socket.
 
void BindToNetDevice (Ptr< NetDevice > netdevice) override
 Bind a socket to specific device.
 
bool CheckEcnCe (uint8_t tos) const
 Checks for CE codepoint.
 
bool CheckEcnEct0 (uint8_t tos) const
 Checks for ECT(0) codepoint.
 
bool CheckEcnEct1 (uint8_t tos) const
 Checks for ECT(1) codepoint.
 
bool CheckNoEcn (uint8_t tos) const
 Checks if TOS has no ECN codepoints.
 
uint8_t ClearEcnBits (uint8_t tos) const
 Clears ECN bits from TOS.
 
int Close () override
 Close a socket.
 
int Connect (const Address &address) override
 Initiate a connection to a remote host.
 
Time GetClockGranularity () const
 Get the Clock Granularity (used in RTO calcs).
 
SocketErrno GetErrno () const override
 Get last error number.
 
TypeId GetInstanceTypeId () const override
 Get the instance TypeId.
 
Time GetMinRto () const
 Get the Minimum RTO.
 
Ptr< NodeGetNode () const override
 Return the node this socket is associated with.
 
int GetPeerName (Address &address) const override
 Get the peer address of a connected socket.
 
uint32_t GetRetxThresh () const
 Get the retransmission threshold (dup ack threshold for a fast retransmit)
 
uint32_t GetRxAvailable () const override
 Return number of bytes which can be returned from one or multiple calls to Recv.
 
Ptr< TcpRxBufferGetRxBuffer () const
 Get a pointer to the Rx buffer.
 
SocketType GetSocketType () const override
 
int GetSockName (Address &address) const override
 Get socket address.
 
uint32_t GetTxAvailable () const override
 Returns the number of bytes which can be sent in a single call to Send.
 
Ptr< TcpTxBufferGetTxBuffer () const
 Get a pointer to the Tx buffer.
 
bool IsEct (TcpPacketType_t packetType) const
 Checks if a TCP packet should be ECN-capable (ECT) according to the TcpPacketType and ECN mode.
 
int Listen () override
 Listen for incoming connections.
 
uint8_t MarkEcnCe (uint8_t tos) const
 Mark CE codepoint.
 
uint8_t MarkEcnCodePoint (const uint8_t tos, const TcpSocketState::EcnCodePoint_t codePoint) const
 mark ECN code point
 
uint8_t MarkEcnEct0 (uint8_t tos) const
 Mark ECT(0) codepoint.
 
uint8_t MarkEcnEct1 (uint8_t tos) const
 Mark ECT(1) codepoint.
 
Ptr< PacketRecv (uint32_t maxSize, uint32_t flags) override
 Read data from the socket.
 
Ptr< PacketRecvFrom (uint32_t maxSize, uint32_t flags, Address &fromAddress) override
 Read a single packet from the socket and retrieve the sender address.
 
int Send (Ptr< Packet > p, uint32_t flags) override
 Send data (or dummy data) to the remote host.
 
int SendTo (Ptr< Packet > p, uint32_t flags, const Address &toAddress) override
 Send data to a specified peer.
 
void SetClockGranularity (Time clockGranularity)
 Sets the Clock Granularity (used in RTO calcs).
 
void SetCongestionControlAlgorithm (Ptr< TcpCongestionOps > algo)
 Install a congestion control algorithm on this socket.
 
void SetMinRto (Time minRto)
 Sets the Minimum RTO.
 
virtual void SetNode (Ptr< Node > node)
 Set the associated node.
 
void SetPaceInitialWindow (bool paceWindow)
 Enable or disable pacing of the initial window.
 
void SetPacingStatus (bool pacing)
 Enable or disable pacing.
 
void SetRecoveryAlgorithm (Ptr< TcpRecoveryOps > recovery)
 Install a recovery algorithm on this socket.
 
void SetRetxThresh (uint32_t retxThresh)
 Set the retransmission threshold (dup ack threshold for a fast retransmit)
 
virtual void SetRtt (Ptr< RttEstimator > rtt)
 Set the associated RTT estimator.
 
virtual void SetTcp (Ptr< TcpL4Protocol > tcp)
 Set the associated TCP L4 protocol.
 
void SetUseEcn (TcpSocketState::UseEcn_t useEcn)
 Set ECN mode of use on the socket.
 
int ShutdownRecv () override
 
int ShutdownSend () override
 
void UpdateBytesInFlight (uint32_t oldValue, uint32_t newValue) const
 Callback function to hook to TcpSocketState bytes inflight.
 
void UpdateCongState (TcpSocketState::TcpCongState_t oldValue, TcpSocketState::TcpCongState_t newValue) const
 Callback function to hook to TcpSocketState congestion state.
 
void UpdateCwnd (uint32_t oldValue, uint32_t newValue) const
 Callback function to hook to TcpSocketState congestion window.
 
void UpdateCwndInfl (uint32_t oldValue, uint32_t newValue) const
 Callback function to hook to TcpSocketState inflated congestion window.
 
void UpdateEcnState (TcpSocketState::EcnState_t oldValue, TcpSocketState::EcnState_t newValue) const
 Callback function to hook to EcnState state.
 
void UpdateHighTxMark (SequenceNumber32 oldValue, SequenceNumber32 newValue) const
 Callback function to hook to TcpSocketState high tx mark.
 
void UpdateLastRtt (Time oldValue, Time newValue) const
 Callback function to hook to TcpSocketState lastRtt.
 
void UpdateNextTxSequence (SequenceNumber32 oldValue, SequenceNumber32 newValue) const
 Callback function to hook to TcpSocketState next tx sequence.
 
void UpdatePacingRateTrace (DataRate oldValue, DataRate newValue) const
 Callback function to hook to TcpSocketState pacing rate.
 
void UpdateRtt (Time oldValue, Time newValue) const
 Callback function to hook to TcpSocketState rtt.
 
void UpdateSsThresh (uint32_t oldValue, uint32_t newValue) const
 Callback function to hook to TcpSocketState slow start threshold.
 
- Public Member Functions inherited from ns3::TcpSocket
 TcpSocket ()
 
 ~TcpSocket () override
 
- Public Member Functions inherited from ns3::Socket
 Socket ()
 
 ~Socket () override
 
Ptr< NetDeviceGetBoundNetDevice ()
 Returns socket's bound NetDevice, if any.
 
uint8_t GetIpTos () const
 Query the value of IP Type of Service of this socket.
 
virtual uint8_t GetIpTtl () const
 Query the value of IP Time to Live field of this socket.
 
virtual uint8_t GetIpv6HopLimit () const
 Query the value of IP Hop Limit field of this socket.
 
uint8_t GetIpv6Tclass () const
 Query the value of IPv6 Traffic Class field of this socket.
 
uint8_t GetPriority () const
 Query the priority value of this socket.
 
virtual void Ipv6JoinGroup (Ipv6Address address)
 Joins a IPv6 multicast group without filters.
 
virtual void Ipv6JoinGroup (Ipv6Address address, Ipv6MulticastFilterMode filterMode, std::vector< Ipv6Address > sourceAddresses)
 Joins a IPv6 multicast group.
 
virtual void Ipv6LeaveGroup ()
 Leaves IPv6 multicast group this socket is joined to.
 
bool IsIpRecvTos () const
 Ask if the socket is currently passing information about IP Type of Service up the stack.
 
bool IsIpRecvTtl () const
 Ask if the socket is currently passing information about IP_TTL up the stack.
 
bool IsIpv6RecvHopLimit () const
 Ask if the socket is currently passing information about IPv6 Hop Limit up the stack.
 
bool IsIpv6RecvTclass () const
 Ask if the socket is currently passing information about IPv6 Traffic Class up the stack.
 
bool IsRecvPktInfo () const
 Get status indicating whether enable/disable packet information to socket.
 
Ptr< PacketRecv ()
 Read a single packet from the socket.
 
int Recv (uint8_t *buf, uint32_t size, uint32_t flags)
 Recv data (or dummy data) from the remote host.
 
Ptr< PacketRecvFrom (Address &fromAddress)
 Read a single packet from the socket and retrieve the sender address.
 
int RecvFrom (uint8_t *buf, uint32_t size, uint32_t flags, Address &fromAddress)
 Read a single packet from the socket and retrieve the sender address.
 
int Send (const uint8_t *buf, uint32_t size, uint32_t flags)
 Send data (or dummy data) to the remote host.
 
int Send (Ptr< Packet > p)
 Send data (or dummy data) to the remote host.
 
int SendTo (const uint8_t *buf, uint32_t size, uint32_t flags, const Address &address)
 Send data to a specified peer.
 
void SetAcceptCallback (Callback< bool, Ptr< Socket >, const Address & > connectionRequest, Callback< void, Ptr< Socket >, const Address & > newConnectionCreated)
 Accept connection requests from remote hosts.
 
void SetCloseCallbacks (Callback< void, Ptr< Socket > > normalClose, Callback< void, Ptr< Socket > > errorClose)
 Detect socket recv() events such as graceful shutdown or error.
 
void SetConnectCallback (Callback< void, Ptr< Socket > > connectionSucceeded, Callback< void, Ptr< Socket > > connectionFailed)
 Specify callbacks to allow the caller to determine if the connection succeeds of fails.
 
void SetDataSentCallback (Callback< void, Ptr< Socket >, uint32_t > dataSent)
 Notify application when a packet has been sent from transport protocol (non-standard socket call)
 
void SetIpRecvTos (bool ipv4RecvTos)
 Tells a socket to pass information about IP Type of Service up the stack.
 
void SetIpRecvTtl (bool ipv4RecvTtl)
 Tells a socket to pass information about IP_TTL up the stack.
 
void SetIpTos (uint8_t ipTos)
 Manually set IP Type of Service field.
 
virtual void SetIpTtl (uint8_t ipTtl)
 Manually set IP Time to Live field.
 
virtual void SetIpv6HopLimit (uint8_t ipHopLimit)
 Manually set IPv6 Hop Limit.
 
void SetIpv6RecvHopLimit (bool ipv6RecvHopLimit)
 Tells a socket to pass information about IPv6 Hop Limit up the stack.
 
void SetIpv6RecvTclass (bool ipv6RecvTclass)
 Tells a socket to pass information about IPv6 Traffic Class up the stack.
 
void SetIpv6Tclass (int ipTclass)
 Manually set IPv6 Traffic Class field.
 
void SetPriority (uint8_t priority)
 Manually set the socket priority.
 
void SetRecvCallback (Callback< void, Ptr< Socket > > receivedData)
 Notify application when new data is available to be read.
 
void SetRecvPktInfo (bool flag)
 Enable/Disable receive packet information to socket.
 
void SetSendCallback (Callback< void, Ptr< Socket >, uint32_t > sendCb)
 Notify application when space in transmit buffer is added.
 
- Public Member Functions inherited from ns3::Object
 Object ()
 Constructor.
 
 ~Object () override
 Destructor.
 
void AggregateObject (Ptr< Object > other)
 Aggregate two Objects together.
 
void Dispose ()
 Dispose of this Object.
 
AggregateIterator GetAggregateIterator () const
 Get an iterator to the Objects aggregated to this one.
 
template<typename T >
Ptr< T > GetObject () const
 Get a pointer to the requested aggregated Object.
 
template<>
Ptr< ObjectGetObject () const
 Specialization of () for objects of type ns3::Object.
 
template<typename T >
Ptr< T > GetObject (TypeId tid) const
 Get a pointer to the requested aggregated Object by TypeId.
 
template<>
Ptr< ObjectGetObject (TypeId tid) const
 Specialization of (TypeId tid) for objects of type ns3::Object.
 
void Initialize ()
 Invoke DoInitialize on all Objects aggregated to this one.
 
bool IsInitialized () const
 Check if the object has been initialized.
 
void UnidirectionalAggregateObject (Ptr< Object > other)
 Aggregate an Object to another Object.
 
- Public Member Functions inherited from ns3::SimpleRefCount< Object, ObjectBase, ObjectDeleter >
 SimpleRefCount ()
 Default constructor.
 
 SimpleRefCount (const SimpleRefCount &o)
 Copy constructor.
 
uint32_t GetReferenceCount () const
 Get the reference count of the object.
 
SimpleRefCountoperator= (const SimpleRefCount &o)
 Assignment operator.
 
void Ref () const
 Increment the reference count.
 
void Unref () const
 Decrement the reference count.
 
- Public Member Functions inherited from ns3::ObjectBase
virtual ~ObjectBase ()
 Virtual destructor.
 
void GetAttribute (std::string name, AttributeValue &value, bool permissive=false) const
 Get the value of an attribute, raising fatal errors if unsuccessful.
 
bool GetAttributeFailSafe (std::string name, AttributeValue &value) const
 Get the value of an attribute without raising errors.
 
void SetAttribute (std::string name, const AttributeValue &value)
 Set a single attribute, raising fatal errors if unsuccessful.
 
bool SetAttributeFailSafe (std::string name, const AttributeValue &value)
 Set a single attribute without raising errors.
 
bool TraceConnect (std::string name, std::string context, const CallbackBase &cb)
 Connect a TraceSource to a Callback with a context.
 
bool TraceConnectWithoutContext (std::string name, const CallbackBase &cb)
 Connect a TraceSource to a Callback without a context.
 
bool TraceDisconnect (std::string name, std::string context, const CallbackBase &cb)
 Disconnect from a TraceSource a Callback previously connected with a context.
 
bool TraceDisconnectWithoutContext (std::string name, const CallbackBase &cb)
 Disconnect from a TraceSource a Callback previously connected without a context.
 

Static Public Member Functions

static TypeId GetTypeId ()
 Get the type ID.
 
- Static Public Member Functions inherited from ns3::TcpSocketBase
static TypeId GetTypeId ()
 Get the type ID.
 
- Static Public Member Functions inherited from ns3::TcpSocket
static TypeId GetTypeId ()
 Get the type ID.
 
- Static Public Member Functions inherited from ns3::Socket
static Ptr< SocketCreateSocket (Ptr< Node > node, TypeId tid)
 This method wraps the creation of sockets that is performed on a given node by a SocketFactory specified by TypeId.
 
static TypeId GetTypeId ()
 Get the type ID.
 
static uint8_t IpTos2Priority (uint8_t ipTos)
 Return the priority corresponding to a given TOS value.
 
- Static Public Member Functions inherited from ns3::Object
static TypeId GetTypeId ()
 Register this type.
 
- Static Public Member Functions inherited from ns3::ObjectBase
static TypeId GetTypeId ()
 Get the type ID.
 

Protected Member Functions

void CompleteFork (Ptr< Packet > p, const TcpHeader &tcpHeader, const Address &fromAddress, const Address &toAddress) override
 Complete a connection by forking the socket.
 
Ptr< TcpSocketBaseFork () override
 Call CopyObject<> to clone me.
 
void ReceivedAck (Ptr< Packet > packet, const TcpHeader &tcpHeader) override
 Received an ACK packet.
 
void ReTxTimeout () override
 An RTO event happened.
 
void UpdateRttHistory (const SequenceNumber32 &seq, uint32_t sz, bool isRetransmission) override
 Update the RTT history, when we send TCP segments.
 
- Protected Member Functions inherited from ns3::TcpSocketBase
void AddOptions (TcpHeader &tcpHeader)
 Add options to TcpHeader.
 
void AddOptionSack (TcpHeader &header)
 Add the SACK option to the header.
 
void AddOptionSackPermitted (TcpHeader &header)
 Add the SACK PERMITTED option to the header.
 
void AddOptionTimestamp (TcpHeader &header)
 Add the timestamp option to the header.
 
void AddOptionWScale (TcpHeader &header)
 Add the window scale option to the header.
 
void AddSocketTags (const Ptr< Packet > &p, bool isEct) const
 Add Tags for the Socket.
 
virtual uint16_t AdvertisedWindowSize (bool scale=true) const
 The amount of Rx window announced to the peer.
 
virtual uint32_t AvailableWindow () const
 Return unfilled portion of window.
 
virtual uint32_t BytesInFlight () const
 Return total bytes in flight.
 
virtual Time CalculateRttSample (const TcpHeader &tcpHeader, const RttHistory &rttHistory)
 Calculate RTT sample for the ACKed packet.
 
uint8_t CalculateWScale () const
 Calculate window scale value based on receive buffer space.
 
void CancelAllTimers ()
 Cancel all timer when endpoint is deleted.
 
void CloseAndNotify ()
 Peacefully close the socket by notifying the upper layer and deallocate end point.
 
void ConnectionSucceeded ()
 Schedule-friendly wrapper for Socket::NotifyConnectionSucceeded()
 
void DeallocateEndPoint ()
 Deallocate m_endPoint and m_endPoint6.
 
virtual void DelAckTimeout ()
 Action upon delay ACK timeout, i.e.
 
void Destroy ()
 Kill this socket by zeroing its attributes (IPv4)
 
void Destroy6 ()
 Kill this socket by zeroing its attributes (IPv6)
 
int DoClose ()
 Close a socket by sending RST, FIN, or FIN+ACK, depend on the current state.
 
int DoConnect ()
 Perform the real connection tasks: Send SYN if allowed, RST if invalid.
 
virtual void DoForwardUp (Ptr< Packet > packet, const Address &fromAddress, const Address &toAddress)
 Called by TcpSocketBase::ForwardUp{,6}().
 
void DoPeerClose ()
 FIN is in sequence, notify app and respond with a FIN.
 
void DoRetransmit ()
 Retransmit the first segment marked as lost, without considering available window nor pacing.
 
void DupAck (uint32_t currentDelivered)
 Dupack management.
 
void EnterCwr (uint32_t currentDelivered)
 Enter CA_CWR state upon receipt of an ECN Echo.
 
void EnterRecovery (uint32_t currentDelivered)
 Enter the CA_RECOVERY, and retransmit the head.
 
virtual void EstimateRtt (const TcpHeader &tcpHeader)
 Take into account the packet for RTT estimation.
 
void ForwardIcmp (Ipv4Address icmpSource, uint8_t icmpTtl, uint8_t icmpType, uint8_t icmpCode, uint32_t icmpInfo)
 Called by the L3 protocol when it received an ICMP packet to pass on to TCP.
 
void ForwardIcmp6 (Ipv6Address icmpSource, uint8_t icmpTtl, uint8_t icmpType, uint8_t icmpCode, uint32_t icmpInfo)
 Called by the L3 protocol when it received an ICMPv6 packet to pass on to TCP.
 
void ForwardUp (Ptr< Packet > packet, Ipv4Header header, uint16_t port, Ptr< Ipv4Interface > incomingInterface)
 Called by the L3 protocol when it received a packet to pass on to TCP.
 
void ForwardUp6 (Ptr< Packet > packet, Ipv6Header header, uint16_t port, Ptr< Ipv6Interface > incomingInterface)
 Called by the L3 protocol when it received a packet to pass on to TCP.
 
bool GetAllowBroadcast () const override
 Query whether broadcast datagram transmissions are allowed.
 
Time GetConnTimeout () const override
 Get the connection timeout.
 
uint32_t GetDataRetries () const override
 Get the number of data transmission retries before giving up.
 
uint32_t GetDelAckMaxCount () const override
 Get the number of packet to fire an ACK before delay timeout.
 
Time GetDelAckTimeout () const override
 Get the time to delay an ACK.
 
SequenceNumber32 GetHighRxAck () const
 Get the current value of the receiver's highest (in-sequence) sequence number acked.
 
uint32_t GetInitialCwnd () const override
 Get the initial Congestion Window.
 
uint32_t GetInitialSSThresh () const override
 Get the initial Slow Start Threshold.
 
Time GetPersistTimeout () const override
 Get the timeout for persistent connection.
 
uint32_t GetRcvBufSize () const override
 Get the receive buffer size.
 
uint32_t GetRWnd () const
 Get the current value of the receiver's offered window (RCV.WND)
 
uint32_t GetSegSize () const override
 Get the segment size.
 
uint32_t GetSndBufSize () const override
 Get the send buffer size.
 
uint32_t GetSynRetries () const override
 Get the number of connection retries before giving up.
 
bool GetTcpNoDelay () const override
 Check if Nagle's algorithm is enabled or not.
 
bool IsPacingEnabled () const
 Return true if packets in the current window should be paced.
 
bool IsTcpOptionEnabled (uint8_t kind) const
 Return true if the specified option is enabled.
 
bool IsValidTcpSegment (const SequenceNumber32 seq, const uint32_t tcpHeaderSize, const uint32_t tcpPayloadSize)
 Checks whether the given TCP segment is valid or not.
 
virtual void LastAckTimeout ()
 Timeout at LAST_ACK, close the connection.
 
virtual void NewAck (const SequenceNumber32 &seq, bool resetRTO)
 Update buffers w.r.t.
 
void NotifyPacingPerformed ()
 Notify Pacing.
 
bool OutOfRange (SequenceNumber32 head, SequenceNumber32 tail) const
 Check if a sequence number range is within the rx window.
 
void PeerClose (Ptr< Packet > p, const TcpHeader &tcpHeader)
 Received a FIN from peer, notify rx buffer.
 
virtual void PersistTimeout ()
 Send 1 byte probe to get an updated window size.
 
virtual void ProcessAck (const SequenceNumber32 &ackNumber, bool scoreboardUpdated, uint32_t currentDelivered, const SequenceNumber32 &oldHeadSequence, bool receivedData)
 Process a received ack.
 
void ProcessClosing (Ptr< Packet > packet, const TcpHeader &tcpHeader)
 Received a packet upon CLOSING.
 
void ProcessEstablished (Ptr< Packet > packet, const TcpHeader &tcpHeader)
 Received a packet upon ESTABLISHED state.
 
void ProcessLastAck (Ptr< Packet > packet, const TcpHeader &tcpHeader)
 Received a packet upon LAST_ACK.
 
void ProcessListen (Ptr< Packet > packet, const TcpHeader &tcpHeader, const Address &fromAddress, const Address &toAddress)
 Received a packet upon LISTEN state.
 
uint32_t ProcessOptionSack (const Ptr< const TcpOption > option)
 Read the SACK option.
 
void ProcessOptionSackPermitted (const Ptr< const TcpOption > option)
 Read the SACK PERMITTED option.
 
void ProcessOptionTimestamp (const Ptr< const TcpOption > option, const SequenceNumber32 &seq)
 Process the timestamp option from other side.
 
void ProcessOptionWScale (const Ptr< const TcpOption > option)
 Read and parse the Window scale option.
 
void ProcessSynRcvd (Ptr< Packet > packet, const TcpHeader &tcpHeader, const Address &fromAddress, const Address &toAddress)
 Received a packet upon SYN_RCVD.
 
void ProcessSynSent (Ptr< Packet > packet, const TcpHeader &tcpHeader)
 Received a packet upon SYN_SENT.
 
void ProcessWait (Ptr< Packet > packet, const TcpHeader &tcpHeader)
 Received a packet upon CLOSE_WAIT, FIN_WAIT_1, FIN_WAIT_2.
 
void ReadOptions (const TcpHeader &tcpHeader, uint32_t *bytesSacked)
 Read TCP options before Ack processing.
 
virtual void ReceivedData (Ptr< Packet > packet, const TcpHeader &tcpHeader)
 Recv of a data, put into buffer, call L7 to get it if necessary.
 
virtual uint32_t SendDataPacket (SequenceNumber32 seq, uint32_t maxSize, bool withAck)
 Extract at most maxSize bytes from the TxBuffer at sequence seq, add the TCP header, and send to TcpL4Protocol.
 
virtual void SendEmptyPacket (uint8_t flags)
 Send a empty packet that carries a flag, e.g., ACK.
 
uint32_t SendPendingData (bool withAck=false)
 Send as much pending data as possible according to the Tx window.
 
void SendRST ()
 Send reset and tear down this socket.
 
bool SetAllowBroadcast (bool allowBroadcast) override
 Configure whether broadcast datagram transmissions are allowed.
 
void SetConnTimeout (Time timeout) override
 Set the connection timeout.
 
void SetDataRetries (uint32_t retries) override
 Set the number of data transmission retries before giving up.
 
void SetDelAckMaxCount (uint32_t count) override
 Set the number of packet to fire an ACK before delay timeout.
 
void SetDelAckTimeout (Time timeout) override
 Set the time to delay an ACK.
 
void SetInitialCwnd (uint32_t cwnd) override
 Set the initial Congestion Window.
 
void SetInitialSSThresh (uint32_t threshold) override
 Set the initial Slow Start Threshold.
 
void SetPersistTimeout (Time timeout) override
 Set the timeout for persistent connection.
 
void SetRcvBufSize (uint32_t size) override
 Set the receive buffer size.
 
void SetSegSize (uint32_t size) override
 Set the segment size.
 
void SetSndBufSize (uint32_t size) override
 Set the send buffer size.
 
void SetSynRetries (uint32_t count) override
 Set the number of connection retries before giving up.
 
void SetTcpNoDelay (bool noDelay) override
 Enable/Disable Nagle's algorithm.
 
int SetupCallback ()
 Common part of the two Bind(), i.e.
 
int SetupEndpoint ()
 Configure the endpoint to a local address.
 
int SetupEndpoint6 ()
 Configure the endpoint v6 to a local address.
 
void TimeWait ()
 Move from CLOSING or FIN_WAIT_2 to TIME_WAIT state.
 
virtual uint32_t UnAckDataCount () const
 Return count of number of unacked bytes.
 
void UpdatePacingRate ()
 Dynamically update the pacing rate.
 
void UpdateWindowSize (const TcpHeader &header)
 Update the receiver window (RWND) based on the value of the window field in the header.
 
virtual uint32_t Window () const
 Return the max possible number of unacked bytes.
 
- Protected Member Functions inherited from ns3::Socket
void DoDispose () override
 Destructor implementation.
 
bool IsManualIpTtl () const
 Checks if the socket has a specific IPv4 TTL set.
 
bool IsManualIpv6HopLimit () const
 Checks if the socket has a specific IPv6 Hop Limit set.
 
bool IsManualIpv6Tclass () const
 Checks if the socket has a specific IPv6 Tclass set.
 
void NotifyConnectionFailed ()
 Notify through the callback (if set) that the connection has not been established due to an error.
 
bool NotifyConnectionRequest (const Address &from)
 Notify through the callback (if set) that an incoming connection is being requested by a remote host.
 
void NotifyConnectionSucceeded ()
 Notify through the callback (if set) that the connection has been established.
 
void NotifyDataRecv ()
 Notify through the callback (if set) that some data have been received.
 
void NotifyDataSent (uint32_t size)
 Notify through the callback (if set) that some data have been sent.
 
void NotifyErrorClose ()
 Notify through the callback (if set) that the connection has been closed due to an error.
 
void NotifyNewConnectionCreated (Ptr< Socket > socket, const Address &from)
 Notify through the callback (if set) that a new connection has been created.
 
void NotifyNormalClose ()
 Notify through the callback (if set) that the connection has been closed.
 
void NotifySend (uint32_t spaceAvailable)
 Notify through the callback (if set) that some data have been sent.
 
- Protected Member Functions inherited from ns3::Object
 Object (const Object &o)
 Copy an Object.
 
virtual void DoInitialize ()
 Initialize() implementation.
 
virtual void NotifyNewAggregate ()
 Notify all Objects aggregated to this one of a new Object being aggregated.
 
- Protected Member Functions inherited from ns3::ObjectBase
void ConstructSelf (const AttributeConstructionList &attributes)
 Complete construction of ObjectBase; invoked by derived classes.
 
virtual void NotifyConstructionCompleted ()
 Notifier called once the ObjectBase is fully constructed.
 

Private Attributes

RetrCb m_afterRetrCallback
 After retransmission callback.
 
RetrCb m_beforeRetrCallback
 Before retransmission callback.
 
Callback< void, Ptr< TcpSocketMsgBase > > m_forkCb
 Fork callback.
 
AckManagementCb m_processedAckCb
 Processed ACK callback.
 
AckManagementCb m_rcvAckCb
 Receive ACK callback.
 
UpdateRttCallback m_updateRttCb
 Update RTT callback.
 

Additional Inherited Members

- Public Attributes inherited from ns3::TcpSocketBase
TracedCallback< uint32_t, uint32_tm_bytesInFlightTrace
 Callback pointer for bytesInFlight trace chaining.
 
TracedCallback< TcpSocketState::TcpCongState_t, TcpSocketState::TcpCongState_tm_congStateTrace
 Callback pointer for congestion state trace chaining.
 
TracedCallback< uint32_t, uint32_tm_cWndInflTrace
 Callback pointer for cWndInfl trace chaining.
 
TracedCallback< uint32_t, uint32_tm_cWndTrace
 Callback pointer for cWnd trace chaining.
 
TracedCallback< TcpSocketState::EcnState_t, TcpSocketState::EcnState_tm_ecnStateTrace
 Callback pointer for ECN state trace chaining.
 
TracedCallback< SequenceNumber32, SequenceNumber32m_highTxMarkTrace
 Callback pointer for high tx mark chaining.
 
TracedCallback< Time, Timem_lastRttTrace
 Callback pointer for Last RTT trace chaining.
 
TracedCallback< SequenceNumber32, SequenceNumber32m_nextTxSequenceTrace
 Callback pointer for next tx sequence chaining.
 
TracedCallback< DataRate, DataRatem_pacingRateTrace
 Callback pointer for pacing rate trace chaining.
 
TracedCallback< Time, Timem_srttTrace
 Callback pointer for RTT trace chaining.
 
TracedCallback< uint32_t, uint32_tm_ssThTrace
 Callback pointer for ssTh trace chaining.
 
- Static Public Attributes inherited from ns3::TcpSocket
static const char *const TcpStateName [TcpSocket::LAST_STATE]
 Literal names of TCP states for use in log messages.
 
- Static Protected Member Functions inherited from ns3::TcpSocketBase
static uint32_t SafeSubtraction (uint32_t a, uint32_t b)
 Performs a safe subtraction between a and b (a-b)
 
- Protected Attributes inherited from ns3::TcpSocketBase
TracedValue< uint32_tm_advWnd {0}
 Advertised Window size.
 
uint32_t m_bytesAckedNotProcessed {0}
 Bytes acked, but not processed.
 
Time m_clockGranularity {Seconds(0.001)}
 Clock Granularity used in RTO calcs.
 
bool m_closeNotified {false}
 Told app to close socket.
 
bool m_closeOnEmpty {false}
 Close socket upon tx buffer emptied.
 
Time m_cnTimeout
 Timeout for connection retry.
 
Ptr< TcpCongestionOpsm_congestionControl
 Congestion control.
 
bool m_connected {false}
 Connection established.
 
uint32_t m_dataRetrCount {0}
 Count of remaining data retransmission attempts.
 
uint32_t m_dataRetries {0}
 Number of data retransmission attempts.
 
uint32_t m_delAckCount {0}
 Delayed ACK counter.
 
EventId m_delAckEvent {}
 Delayed ACK timeout event.
 
uint32_t m_delAckMaxCount {0}
 Number of packet to fire an ACK before delay timeout.
 
Time m_delAckTimeout
 Time to delay an ACK.
 
uint32_t m_dupAckCount {0}
 Dupack counter.
 
TracedValue< SequenceNumber32m_ecnCESeq
 Sequence number of the last received Congestion Experienced.
 
TracedValue< SequenceNumber32m_ecnCWRSeq {0}
 Sequence number of the last sent CWR.
 
TracedValue< SequenceNumber32m_ecnEchoSeq
 Sequence number of the last received ECN Echo.
 
Ipv4EndPointm_endPoint {nullptr}
 the IPv4 endpoint
 
Ipv6EndPointm_endPoint6 {nullptr}
 the IPv6 endpoint
 
SocketErrno m_errno {ERROR_NOTERROR}
 Socket error code.
 
TracedValue< SequenceNumber32m_highRxAckMark {0}
 Highest ack received.
 
TracedValue< SequenceNumber32m_highRxMark {0}
 Highest seqno received.
 
SequenceNumber32 m_highTxAck {0}
 Highest ack sent.
 
std::deque< RttHistorym_history
 List of sent packet.
 
Callback< void, Ipv4Address, uint8_t, uint8_t, uint8_t, uint32_tm_icmpCallback
 ICMP callback.
 
Callback< void, Ipv6Address, uint8_t, uint8_t, uint8_t, uint32_tm_icmpCallback6
 ICMPv6 callback.
 
bool m_isFirstPartialAck {true}
 First partial ACK during RECOVERY.
 
EventId m_lastAckEvent {}
 Last ACK timeout event.
 
bool m_limitedTx {true}
 perform limited transmit
 
uint16_t m_maxWinSize {0}
 Maximum window size to advertise.
 
Time m_minRto {Time::Max()}
 minimum value of the Retransmit timeout
 
double m_msl {0.0}
 Max segment lifetime.
 
Ptr< Nodem_node
 the associated node
 
bool m_noDelay {false}
 Set to true to disable Nagle's algorithm.
 
Timer m_pacingTimer {Timer::CANCEL_ON_DESTROY}
 Pacing Event.
 
EventId m_persistEvent {}
 Persist event: Send 1 byte to probe for a non-zero Rx window.
 
Time m_persistTimeout
 Time between sending 1-byte probes.
 
Ptr< TcpRateOpsm_rateOps
 Rate operations.
 
uint8_t m_rcvWindShift {0}
 Window shift to apply to outgoing segments.
 
SequenceNumber32 m_recover
 Previous highest Tx seqnum for fast recovery (set it to initial seq number)
 
bool m_recoverActive {false}
 Whether "m_recover" has been set/activated It is used to avoid comparing with the old m_recover value which was set for handling previous congestion event.
 
Ptr< TcpRecoveryOpsm_recoveryOps
 Recovery Algorithm.
 
TracedCallback< Ptr< const Packet >, const TcpHeader &, const Address &, const Address &, Ptr< const TcpSocketBase > > m_retransmissionTrace
 Trace of retransmitted packets.
 
EventId m_retxEvent {}
 Retransmission event.
 
uint32_t m_retxThresh {3}
 Fast Retransmit threshold.
 
TracedValue< Timem_rto
 Retransmit timeout.
 
Ptr< RttEstimatorm_rtt
 Round trip time estimator.
 
TracedValue< uint32_tm_rWnd {0}
 Receiver window (RCV.WND in RFC793)
 
TracedCallback< Ptr< const Packet >, const TcpHeader &, Ptr< const TcpSocketBase > > m_rxTrace
 Trace of received packets.
 
bool m_sackEnabled {true}
 RFC SACK option enabled.
 
EventId m_sendPendingDataEvent {}
 micro-delay event to send pending data
 
bool m_shutdownRecv {false}
 Receive no longer allowed.
 
bool m_shutdownSend {false}
 Send no longer allowed.
 
uint8_t m_sndWindShift {0}
 Window shift to apply to incoming segments.
 
TracedValue< TcpStates_tm_state {CLOSED}
 TCP state.
 
uint32_t m_synCount {0}
 Count of remaining connection retries.
 
uint32_t m_synRetries {0}
 Number of connection attempts.
 
Ptr< TcpSocketStatem_tcb
 Congestion control information.
 
Ptr< TcpL4Protocolm_tcp
 the associated TCP L4 protocol
 
bool m_timestampEnabled {true}
 Timestamp option enabled.
 
uint32_t m_timestampToEcho {0}
 Timestamp to echo.
 
EventId m_timewaitEvent {}
 TIME_WAIT expiration event: Move this socket to CLOSED state.
 
Ptr< TcpTxBufferm_txBuffer
 Tx buffer.
 
TracedCallback< Ptr< const Packet >, const TcpHeader &, Ptr< const TcpSocketBase > > m_txTrace
 Trace of transmitted packets.
 
bool m_winScalingEnabled {true}
 Window Scale option enabled (RFC 7323)
 
- Protected Attributes inherited from ns3::Socket
Ptr< NetDevicem_boundnetdevice
 the device this socket is bound to (might be null).
 
Ipv6Address m_ipv6MulticastGroupAddress
 IPv6 multicast group address.
 
bool m_recvPktInfo
 if the socket should add packet info tags to the packet forwarded to L4.
 

Detailed Description

Class for inserting callbacks special points of the flow of TCP sockets.

This subclass is born to extend TcpSocketBase, inserting callbacks in certain points of the flow, to be used in testing to check certain values or flow directions.

There isn't the necessity to fill TcpSocketBase of TracedCallbacks; the rationale is to maintain the base class as clean as possible.

To be fair with testing, this class should NOT modify the behavior of TcpSocketBase.

See also
SetRcvAckCb
SetProcessedAckCb
SetAfterRetransmitCb
SetBeforeRetransmitCb

Definition at line 40 of file tcp-general-test.h.

Member Typedef Documentation

◆ AckManagementCb

Callback for the ACK management.

Definition at line 71 of file tcp-general-test.h.

◆ RetrCb

Callback for the packet retransmission management.

Definition at line 73 of file tcp-general-test.h.

◆ UpdateRttCallback

Callback for the RTT update management.

Definition at line 76 of file tcp-general-test.h.

Constructor & Destructor Documentation

◆ TcpSocketMsgBase() [1/2]

ns3::TcpSocketMsgBase::TcpSocketMsgBase ( )
inline

Definition at line 49 of file tcp-general-test.h.

◆ TcpSocketMsgBase() [2/2]

ns3::TcpSocketMsgBase::TcpSocketMsgBase ( const TcpSocketMsgBase & other)
inline

Constructor.

Parameters
otherThe object to copy from.

Definition at line 58 of file tcp-general-test.h.

References m_afterRetrCallback, m_beforeRetrCallback, m_forkCb, m_processedAckCb, m_rcvAckCb, and m_updateRttCb.

Member Function Documentation

◆ CompleteFork()

void TcpSocketMsgBase::CompleteFork ( Ptr< Packet > p,
const TcpHeader & tcpHeader,
const Address & fromAddress,
const Address & toAddress )
overrideprotectedvirtual

Complete a connection by forking the socket.

This function is called only if a SYN received in LISTEN state. After TcpSocketBase cloned, allocate a new end point to handle the incoming connection and send a SYN+ACK to complete the handshake.

Parameters
pthe packet triggering the fork
tcpHeaderthe TCP header of the triggering packet
fromAddressthe address of the remote host
toAddressthe address the connection is directed to

Reimplemented from ns3::TcpSocketBase.

Definition at line 1130 of file tcp-general-test.cc.

References ns3::TcpSocketBase::CompleteFork(), and m_forkCb.

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◆ Fork()

Ptr< TcpSocketBase > TcpSocketMsgBase::Fork ( )
overrideprotectedvirtual

Call CopyObject<> to clone me.

Returns
a copy of the socket

Reimplemented from ns3::TcpSocketBase.

Reimplemented in ns3::TcpSocketSmallAcks.

Definition at line 1053 of file tcp-general-test.cc.

References ns3::Object::CopyObject.

◆ GetTypeId()

TypeId TcpSocketMsgBase::GetTypeId ( )
static

Get the type ID.

Returns
the object TypeId

Definition at line 1043 of file tcp-general-test.cc.

References ns3::TypeId::SetParent().

Referenced by ns3::TcpGeneralTest::CreateReceiverSocket(), TcpDctcpCodePointsTest::CreateReceiverSocket(), ns3::TcpGeneralTest::CreateSenderSocket(), and TcpDctcpCodePointsTest::CreateSenderSocket().

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◆ ReceivedAck()

void TcpSocketMsgBase::ReceivedAck ( Ptr< Packet > packet,
const TcpHeader & tcpHeader )
overrideprotectedvirtual

Received an ACK packet.

Parameters
packetthe packet
tcpHeaderthe packet's TCP header

Reimplemented from ns3::TcpSocketBase.

Definition at line 1087 of file tcp-general-test.cc.

References ns3::Callback< R, UArgs >::IsNull(), m_processedAckCb, m_rcvAckCb, NS_ASSERT, and ns3::TcpSocketBase::ReceivedAck().

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◆ ReTxTimeout()

void TcpSocketMsgBase::ReTxTimeout ( )
overrideprotectedvirtual

An RTO event happened.

Reimplemented from ns3::TcpSocketBase.

Definition at line 1098 of file tcp-general-test.cc.

References m_afterRetrCallback, m_beforeRetrCallback, ns3::TcpSocketBase::m_tcb, and ns3::TcpSocketBase::ReTxTimeout().

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◆ SetAfterRetransmitCb()

void TcpSocketMsgBase::SetAfterRetransmitCb ( RetrCb cb)

Set the callback invoked after the processing of a retransmit timeout.

Parameters
cbcallback

Definition at line 1073 of file tcp-general-test.cc.

References ns3::Callback< R, UArgs >::IsNull(), m_afterRetrCallback, and NS_ASSERT.

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◆ SetBeforeRetransmitCb()

void TcpSocketMsgBase::SetBeforeRetransmitCb ( RetrCb cb)

Set the callback invoked before the processing of a retransmit timeout.

Parameters
cbcallback

Definition at line 1080 of file tcp-general-test.cc.

References ns3::Callback< R, UArgs >::IsNull(), m_beforeRetrCallback, and NS_ASSERT.

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◆ SetForkCb()

void TcpSocketMsgBase::SetForkCb ( Callback< void, Ptr< TcpSocketMsgBase > > cb)

Set the callback invoked after the forking.

Parameters
cbcallback

Definition at line 1106 of file tcp-general-test.cc.

References m_forkCb, and NS_ASSERT.

◆ SetProcessedAckCb()

void TcpSocketMsgBase::SetProcessedAckCb ( AckManagementCb cb)

Set the callback invoked when an ACK is received and processed (at the end of the processing)

Parameters
cbcallback

Definition at line 1066 of file tcp-general-test.cc.

References ns3::Callback< R, UArgs >::IsNull(), m_processedAckCb, and NS_ASSERT.

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◆ SetRcvAckCb()

void TcpSocketMsgBase::SetRcvAckCb ( AckManagementCb cb)

Set the callback invoked when an ACK is received (at the beginning of the processing)

Parameters
cbcallback

Definition at line 1059 of file tcp-general-test.cc.

References ns3::Callback< R, UArgs >::IsNull(), m_rcvAckCb, and NS_ASSERT.

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◆ SetUpdateRttHistoryCb()

void TcpSocketMsgBase::SetUpdateRttHistoryCb ( UpdateRttCallback cb)

Set the callback invoked when we update rtt history.

Parameters
cbcallback

Definition at line 1113 of file tcp-general-test.cc.

References ns3::Callback< R, UArgs >::IsNull(), m_updateRttCb, and NS_ASSERT.

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◆ UpdateRttHistory()

void TcpSocketMsgBase::UpdateRttHistory ( const SequenceNumber32 & seq,
uint32_t sz,
bool isRetransmission )
overrideprotectedvirtual

Update the RTT history, when we send TCP segments.

Parameters
seqThe sequence number of the TCP segment
szThe segment's size
isRetransmissionWhether or not the segment is a retransmission

Reimplemented from ns3::TcpSocketBase.

Definition at line 1120 of file tcp-general-test.cc.

References ns3::Callback< R, UArgs >::IsNull(), m_updateRttCb, and ns3::TcpSocketBase::UpdateRttHistory().

Referenced by ns3::TcpSocketCongestedRouter::SendDataPacket(), and TcpDctcpCongestedRouter::SendDataPacket().

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Member Data Documentation

◆ m_afterRetrCallback

RetrCb ns3::TcpSocketMsgBase::m_afterRetrCallback
private

After retransmission callback.

Definition at line 135 of file tcp-general-test.h.

Referenced by TcpSocketMsgBase(), ReTxTimeout(), and SetAfterRetransmitCb().

◆ m_beforeRetrCallback

RetrCb ns3::TcpSocketMsgBase::m_beforeRetrCallback
private

Before retransmission callback.

Definition at line 134 of file tcp-general-test.h.

Referenced by TcpSocketMsgBase(), ReTxTimeout(), and SetBeforeRetransmitCb().

◆ m_forkCb

Callback<void, Ptr<TcpSocketMsgBase> > ns3::TcpSocketMsgBase::m_forkCb
private

Fork callback.

Definition at line 136 of file tcp-general-test.h.

Referenced by TcpSocketMsgBase(), CompleteFork(), and SetForkCb().

◆ m_processedAckCb

AckManagementCb ns3::TcpSocketMsgBase::m_processedAckCb
private

Processed ACK callback.

Definition at line 133 of file tcp-general-test.h.

Referenced by TcpSocketMsgBase(), ReceivedAck(), and SetProcessedAckCb().

◆ m_rcvAckCb

AckManagementCb ns3::TcpSocketMsgBase::m_rcvAckCb
private

Receive ACK callback.

Definition at line 132 of file tcp-general-test.h.

Referenced by TcpSocketMsgBase(), ReceivedAck(), and SetRcvAckCb().

◆ m_updateRttCb

UpdateRttCallback ns3::TcpSocketMsgBase::m_updateRttCb
private

Update RTT callback.

Definition at line 137 of file tcp-general-test.h.

Referenced by TcpSocketMsgBase(), SetUpdateRttHistoryCb(), and UpdateRttHistory().


The documentation for this class was generated from the following files: