161 lines
5.0 KiB
C++
161 lines
5.0 KiB
C++
/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
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/*
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* Copyright (c) 2007 Georgia Tech Research Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation;
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Author: Raj Bhattacharjea <raj.b@gatech.edu>
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*/
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#ifndef TCP_SOCKET_H
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#define TCP_SOCKET_H
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#include <stdint.h>
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#include "ns3/callback.h"
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#include "ns3/socket.h"
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#include "ns3/ptr.h"
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#include "ns3/ipv4-address.h"
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#include "ns3/event-id.h"
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#include "tcp-typedefs.h"
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#include "pending-data.h"
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#include "sequence-number.h"
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#include "rtt-estimator.h"
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namespace ns3 {
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class Ipv4EndPoint;
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class Node;
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class Packet;
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class TcpL4Protocol;
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class TcpHeader;
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class TcpSocket : public Socket
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{
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public:
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/**
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* Create an unbound tcp socket.
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*/
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TcpSocket (Ptr<Node> node, Ptr<TcpL4Protocol> tcp);
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virtual ~TcpSocket ();
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virtual enum SocketErrno GetErrno (void) const;
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virtual Ptr<Node> GetNode (void) const;
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virtual int Bind (void);
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virtual int Bind (const Address &address);
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virtual int Close (void);
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virtual int ShutdownSend (void);
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virtual int ShutdownRecv (void);
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virtual int Connect(const Address &address);
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virtual int Send (Ptr<Packet> p);
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virtual int Send (const uint8_t* buf, uint32_t size);
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virtual int SendTo(const Address &address, Ptr<Packet> p);
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virtual int Listen(uint32_t queueLimit);
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private:
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friend class Tcp;
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// invoked by Tcp class
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int FinishBind (void);
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void ForwardUp (Ptr<Packet> p, Ipv4Address ipv4, uint16_t port);
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void Destroy (void);
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int DoSendTo (Ptr<Packet> p, const Address &daddr);
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int DoSendTo (Ptr<Packet> p, Ipv4Address daddr, uint16_t dport);
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void SendEmptyPacket(uint8_t flags);
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//methods for state
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bool ProcessAction (Actions_t a);
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bool ProcessAction (Actions_t a, const TcpHeader& tcpHeader,
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Ipv4Address saddr, Ipv4Address daddr);
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bool ProcessPacketAction (Actions_t a, Ptr<Packet> p,
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const TcpHeader& tcpHeader,
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const Address& fromAddress);
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Actions_t ProcessEvent (Events_t e);
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bool SendPendingData(bool withAck = false);
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//methods for window management
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virtual uint32_t UnAckDataCount(); // Return count of number of unacked bytes
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virtual uint32_t BytesInFlight(); // Return total bytes in flight
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virtual uint32_t Window(); // Return window size (integer)
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virtual uint32_t AvailableWindow();// Return unfilled portion of window
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// Manage data tx/rx
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void NewRx (Ptr<Packet>, const TcpHeader&, const Address&);
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// XXX This should be virtual and overridden
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void NewAck (SequenceNumber seq);
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// XXX This should be virtual and overridden
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void DupAck (const TcpHeader& t, uint32_t count);
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void ReTxTimeout ();
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void LastAckTimeout ();
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void Retransmit ();
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void CommonNewAck (SequenceNumber seq, bool skipTimer = false);
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bool m_skipRetxResched;
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uint32_t m_dupAckCount;
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EventId m_retxEvent;
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EventId m_lastAckEvent;
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Ipv4EndPoint *m_endPoint;
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Ptr<Node> m_node;
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Ptr<TcpL4Protocol> m_tcp;
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Ipv4Address m_defaultAddress;
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uint16_t m_defaultPort;
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Callback<void, Ptr<Socket>, uint32_t, const Address &> m_dummyRxCallback;
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Callback<void, Ptr<Socket>, uint8_t const*, uint32_t, const Address &>
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m_rxCallback;
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enum SocketErrno m_errno;
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bool m_shutdownSend;
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bool m_shutdownRecv;
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bool m_connected;
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//manage the state infomation
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States_t m_state;
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bool m_closeNotified;
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bool m_closeRequestNotified;
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bool m_closeOnEmpty;
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bool m_pendingClose;
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//sequence info, sender side
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SequenceNumber m_nextTxSequence;
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SequenceNumber m_highTxMark;
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SequenceNumber m_highestRxAck;
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SequenceNumber m_lastRxAck;
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//sequence info, reciever side
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SequenceNumber m_nextRxSequence;
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//history data
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UnAckData_t m_bufferedData;
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PendingData* m_pendingData;
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SequenceNumber m_firstPendingSequence;
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// Window management
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uint32_t m_segmentSize; // SegmentSize
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uint32_t m_rxWindowSize;
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uint32_t m_advertisedWindowSize; // Window to advertise to peer
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uint32_t m_cWnd; // Congestion window
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uint32_t m_ssThresh; // Slow Start Threshold
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uint32_t m_initialCWnd; // Initial (and reset) value for cWnd
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// Round trip time estimation
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Ptr<RttEstimator> m_rtt;
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Time m_lastMeasuredRtt;
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// Timer-related members
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Time m_cnTimeout;
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uint32_t m_cnCount;
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};
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}//namespace ns3
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#endif /* UDP_SOCKET_H */
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