author | Andrey Mazo <mazo@iitp.ru> |
Fri, 23 Apr 2010 15:09:31 +0400 | |
changeset 6273 | 8d70de29d514 |
parent 5971 | 805783c866fc |
child 6328 | f03f4d82daaf |
permissions | -rw-r--r-- |
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/* -*- 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_IMPL_H |
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#define TCP_SOCKET_IMPL_H |
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#include <stdint.h> |
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#include <queue> |
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#include "ns3/callback.h" |
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#include "ns3/traced-value.h" |
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#include "ns3/tcp-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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/** |
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* \ingroup socket |
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* \ingroup tcp |
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* |
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* \brief An implementation of a stream socket using TCP. |
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* |
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* This class contains an implementation of TCP Tahoe, as well as a sockets |
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* interface for talking to TCP. Features include connection orientation, |
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* reliability through cumulative acknowledgements, congestion and flow |
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* control. Finite send buffer semantics are modeled, but as of yet, finite |
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* receive buffer modelling is unimplemented. |
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* |
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* The closedown of these sockets is as of yet not compliant with the relevant |
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* RFCs, i.e. the FIN handshaking isn't correct. While this is visible at the |
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* PCAP tracing level, it has no effect on the statistics users are interested |
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* in, i.e. throughput, delay, etc. of actual payload data. |
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* |
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* Asynchronous callbacks to provide notifications to higher layers that a |
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* protocol event has occured, such as space freeing up in the send buffer |
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* or new data arriving in the receive buffer. |
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*/ |
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class TcpSocketImpl : public TcpSocket |
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{ |
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public: |
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static TypeId GetTypeId (void); |
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/** |
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* Create an unbound tcp socket. |
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*/ |
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TcpSocketImpl (); |
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TcpSocketImpl (const TcpSocketImpl& sock); |
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virtual ~TcpSocketImpl (); |
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void SetNode (Ptr<Node> node); |
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void SetTcp (Ptr<TcpL4Protocol> tcp); |
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void SetRtt (Ptr<RttEstimator> rtt); |
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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 Listen(void); |
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virtual uint32_t GetTxAvailable (void) const; |
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virtual int Send (Ptr<Packet> p, uint32_t flags); |
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virtual int SendTo(Ptr<Packet> p, uint32_t flags, const Address &toAddress); |
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virtual uint32_t GetRxAvailable (void) const; |
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virtual Ptr<Packet> Recv (uint32_t maxSize, uint32_t flags); |
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virtual Ptr<Packet> RecvFrom (uint32_t maxSize, uint32_t flags, |
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Address &fromAddress); |
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virtual int GetSockName (Address &address) const; |
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virtual void BindToNetDevice (Ptr<NetDevice> netdevice); |
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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 saddr, Ipv4Address daddr, 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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void SendRST(); |
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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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const Address& toAddress); |
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Actions_t ProcessEvent (Events_t e); |
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bool SendPendingData(bool withAck = false); |
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void CompleteFork(Ptr<Packet>, const TcpHeader&, const Address& fromAddress, const Address& toAddress); |
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122 |
void ConnectionSucceeded(); |
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123 |
|
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124 |
//methods for window management |
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125 |
virtual uint32_t UnAckDataCount(); // Return count of number of unacked bytes |
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126 |
virtual uint32_t BytesInFlight(); // Return total bytes in flight |
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127 |
virtual uint32_t Window(); // Return window size (integer) |
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128 |
virtual uint32_t AvailableWindow();// Return unfilled portion of window |
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129 |
|
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130 |
//methods for Rx buffer management |
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131 |
uint32_t RxBufferFreeSpace(); |
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132 |
uint16_t AdvertisedWindowSize(); |
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133 |
|
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134 |
// Manage data tx/rx |
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135 |
void NewRx (Ptr<Packet>, const TcpHeader&, const Address& fromAddress, const Address& toAddress); |
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136 |
void RxBufFinishInsert (SequenceNumber); |
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137 |
Ptr<TcpSocketImpl> Copy (); |
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138 |
virtual void NewAck (SequenceNumber seq); |
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139 |
virtual void DupAck (const TcpHeader& t, uint32_t count); |
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140 |
virtual void ReTxTimeout (); |
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141 |
void DelAckTimeout (); |
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142 |
void LastAckTimeout (); |
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143 |
void PersistTimeout (); |
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144 |
void Retransmit (); |
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145 |
void CommonNewAck (SequenceNumber seq, bool skipTimer = false); |
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146 |
// All timers are cancelled when the endpoint is deleted, to insure |
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147 |
// we don't have additional activity |
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148 |
void CancelAllTimers(); |
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149 |
// attribute related |
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150 |
virtual void SetSndBufSize (uint32_t size); |
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151 |
virtual uint32_t GetSndBufSize (void) const; |
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152 |
virtual void SetRcvBufSize (uint32_t size); |
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153 |
virtual uint32_t GetRcvBufSize (void) const; |
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154 |
virtual void SetSegSize (uint32_t size); |
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155 |
virtual uint32_t GetSegSize (void) const; |
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156 |
virtual void SetSSThresh (uint32_t threshold); |
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157 |
virtual uint32_t GetSSThresh (void) const; |
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158 |
virtual void SetInitialCwnd (uint32_t cwnd); |
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159 |
virtual uint32_t GetInitialCwnd (void) const; |
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160 |
virtual void SetConnTimeout (Time timeout); |
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161 |
virtual Time GetConnTimeout (void) const; |
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162 |
virtual void SetConnCount (uint32_t count); |
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163 |
virtual uint32_t GetConnCount (void) const; |
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164 |
virtual void SetDelAckTimeout (Time timeout); |
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165 |
virtual Time GetDelAckTimeout (void) const; |
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166 |
virtual void SetDelAckMaxCount (uint32_t count); |
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167 |
virtual uint32_t GetDelAckMaxCount (void) const; |
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168 |
|
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169 |
bool m_skipRetxResched; |
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170 |
uint32_t m_dupAckCount; |
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|
171 |
EventId m_retxEvent; |
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|
172 |
EventId m_lastAckEvent; |
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|
173 |
|
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|
174 |
EventId m_delAckEvent; |
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|
175 |
uint32_t m_delAckCount; |
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|
176 |
uint32_t m_delAckMaxCount; |
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177 |
Time m_delAckTimeout; |
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|
178 |
|
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179 |
Ipv4EndPoint *m_endPoint; |
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|
180 |
Ptr<Node> m_node; |
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|
181 |
Ptr<TcpL4Protocol> m_tcp; |
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|
182 |
|
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|
183 |
enum SocketErrno m_errno; |
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|
184 |
bool m_shutdownSend; |
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|
185 |
bool m_shutdownRecv; |
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|
186 |
bool m_connected; |
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|
187 |
|
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|
188 |
//manage the state information |
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|
189 |
States_t m_state; |
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|
190 |
bool m_closeNotified; |
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|
191 |
bool m_closeRequestNotified; |
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|
192 |
bool m_closeOnEmpty; |
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|
193 |
bool m_pendingClose; |
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|
194 |
|
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|
195 |
|
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|
196 |
//sequence info, sender side |
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|
197 |
SequenceNumber m_nextTxSequence; |
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|
198 |
SequenceNumber m_highTxMark; |
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|
199 |
SequenceNumber m_highestRxAck; |
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|
200 |
SequenceNumber m_lastRxAck; |
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|
201 |
|
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|
202 |
//sequence info, receiver side |
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203 |
SequenceNumber m_nextRxSequence; //next expected sequence |
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204 |
|
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|
205 |
//Rx buffer |
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|
206 |
UnAckData_t m_bufferedData; //buffer which sorts out of sequence data |
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|
207 |
//Rx buffer state |
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|
208 |
uint32_t m_rxAvailable; // amount of data available for reading through Recv |
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|
209 |
uint32_t m_rxBufSize; //size in bytes of the data in the rx buf |
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|
210 |
//note that these two are not the same: rxAvailbale is the number of |
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|
211 |
//contiguous sequenced bytes that can be read, rxBufSize is the TOTAL size |
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|
212 |
//including out of sequence data, such that m_rxAvailable <= m_rxBufSize |
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|
213 |
|
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|
214 |
//this is kind of the tx buffer |
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|
215 |
PendingData* m_pendingData; |
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|
216 |
SequenceNumber m_firstPendingSequence; |
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|
217 |
|
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|
218 |
// Window management |
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|
219 |
uint32_t m_segmentSize; //SegmentSize |
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|
220 |
uint32_t m_rxWindowSize; //Flow control window |
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|
221 |
TracedValue<uint32_t> m_cWnd; //Congestion window |
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|
222 |
uint32_t m_ssThresh; //Slow Start Threshold |
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|
223 |
uint32_t m_initialCWnd; //Initial cWnd value |
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|
224 |
|
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|
225 |
//persist timer management |
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|
226 |
Time m_persistTime; |
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|
227 |
EventId m_persistEvent; |
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|
228 |
|
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|
229 |
|
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|
230 |
// Round trip time estimation |
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|
231 |
Ptr<RttEstimator> m_rtt; |
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|
232 |
Time m_lastMeasuredRtt; |
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|
233 |
|
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|
234 |
// Timer-related members |
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|
235 |
Time m_cnTimeout; |
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|
236 |
uint32_t m_cnCount; |
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237 |
|
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|
238 |
// Attributes |
3252 | 239 |
uint32_t m_sndBufSize; // buffer limit for the outgoing queue |
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uint32_t m_rxBufMaxSize; // maximum receive socket buffer size |
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}; |
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}//namespace ns3 |
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#endif /* TCP_SOCKET_IMPL_H */ |