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1 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */ |
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2 /* |
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3 * This program is free software; you can redistribute it and/or modify |
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4 * it under the terms of the GNU General Public License version 2 as |
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5 * published by the Free Software Foundation; |
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6 * |
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7 * This program is distributed in the hope that it will be useful, |
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8 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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10 * GNU General Public License for more details. |
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11 * |
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12 * You should have received a copy of the GNU General Public License |
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13 * along with this program; if not, write to the Free Software |
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14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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15 */ |
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16 |
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17 #include <fstream> |
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18 #include "ns3/core-module.h" |
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19 #include "ns3/common-module.h" |
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20 #include "ns3/simulator-module.h" |
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21 #include "ns3/node-module.h" |
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22 #include "ns3/helper-module.h" |
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23 |
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24 using namespace ns3; |
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25 |
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26 NS_LOG_COMPONENT_DEFINE ("FifthScriptExample"); |
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27 |
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28 // =========================================================================== |
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29 // |
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30 // node 0 node 1 |
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31 // +----------------+ +----------------+ |
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32 // | ns-3 TCP | | ns-3 TCP | |
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33 // +----------------+ +----------------+ |
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34 // | 10.1.1.1 | | 10.1.1.2 | |
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35 // +----------------+ +----------------+ |
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36 // | point-to-point | | point-to-point | |
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37 // +----------------+ +----------------+ |
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38 // | | |
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39 // +---------------------+ |
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40 // 5 Mbps, 2 ms |
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41 // |
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42 // |
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43 // We want to look at changes in the ns-3 TCP congestion window. We need |
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44 // to crank up a flow and hook the CongestionWindow attribute on the socket |
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45 // of the sender. Normally one would use an on-off application to generate a |
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46 // flow, but this has a couple of problems. First, the socket of the on-off |
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47 // application is not created until Application Start time, so we wouldn't be |
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48 // able to hook the socket (now) at configuration time. Second, even if we |
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49 // could arrange a call after start time, the socket is not public so we |
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50 // couldn't get at it. |
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51 // |
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52 // So, we can cook up a simple version of the on-off application that does what |
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53 // we want. On the plus side we don't need all of the complexity of the on-off |
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54 // application. On the minus side, we don't have a helper, so we have to get |
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55 // a little more involved in the details, but this is trivial. |
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56 // |
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57 // So first, we create a socket and do the trace connect on it; then we pass |
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58 // this socket into the constructor of our simple application which we then |
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59 // install in the source node. |
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60 // =========================================================================== |
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61 // |
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62 class SimpleSource : public Application |
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63 { |
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64 public: |
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65 |
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66 SimpleSource (); |
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67 virtual ~SimpleSource(); |
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68 |
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69 void Setup (Ptr<Socket> socket, Address address, uint32_t packetSize, uint32_t nPackets, DataRate dataRate); |
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70 |
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71 private: |
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72 virtual void StartApplication (void); |
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73 virtual void StopApplication (void); |
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74 |
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75 void ScheduleTx (void); |
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76 void SendPacket (void); |
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77 |
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78 Ptr<Socket> m_socket; |
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79 Address m_peer; |
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80 uint32_t m_packetSize; |
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81 uint32_t m_nPackets; |
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82 DataRate m_dataRate; |
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83 EventId m_sendEvent; |
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84 bool m_running; |
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85 uint32_t m_packetsSent; |
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86 }; |
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87 |
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88 SimpleSource::SimpleSource () |
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89 : m_socket (0), |
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90 m_peer (), |
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91 m_packetSize (0), |
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92 m_nPackets (0), |
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93 m_dataRate (0), |
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94 m_sendEvent (), |
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95 m_running (false), |
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96 m_packetsSent (0) |
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97 { |
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98 } |
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99 |
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100 SimpleSource::~SimpleSource() |
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101 { |
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102 m_socket = 0; |
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103 } |
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104 |
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105 void |
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106 SimpleSource::Setup (Ptr<Socket> socket, Address address, uint32_t packetSize, uint32_t nPackets, DataRate dataRate) |
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107 { |
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108 m_socket = socket; |
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109 m_peer = address; |
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110 m_packetSize = packetSize; |
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111 m_nPackets = nPackets; |
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112 m_dataRate = dataRate; |
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113 } |
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114 |
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115 void |
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116 SimpleSource::StartApplication (void) |
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117 { |
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118 m_running = true; |
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119 m_packetsSent = 0; |
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120 m_socket->Bind (); |
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121 m_socket->Connect (m_peer); |
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122 SendPacket (); |
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123 } |
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124 |
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125 void |
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126 SimpleSource::StopApplication (void) |
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127 { |
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128 m_running = false; |
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129 |
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130 if (m_sendEvent.IsRunning ()) |
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131 { |
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132 Simulator::Cancel (m_sendEvent); |
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133 } |
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134 |
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135 if (m_socket) |
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136 { |
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137 m_socket->Close (); |
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138 } |
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139 } |
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140 |
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141 void |
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142 SimpleSource::SendPacket (void) |
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143 { |
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144 Ptr<Packet> packet = Create<Packet> (m_packetSize); |
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145 m_socket->Send (packet); |
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146 |
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147 if (++m_packetsSent < m_nPackets) |
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148 { |
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149 ScheduleTx (); |
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150 } |
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151 } |
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152 |
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153 void |
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154 SimpleSource::ScheduleTx (void) |
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155 { |
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156 if (m_running) |
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157 { |
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158 Time tNext (Seconds (m_packetSize * 8 / static_cast<double> (m_dataRate.GetBitRate ()))); |
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159 m_sendEvent = Simulator::Schedule (tNext, &SimpleSource::SendPacket, this); |
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160 } |
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161 } |
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162 |
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163 static void |
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164 CwndChange (uint32_t oldCwnd, uint32_t newCwnd) |
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165 { |
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166 NS_LOG_UNCOND (Simulator::Now ().GetSeconds () << "\t" << newCwnd); |
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167 } |
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168 |
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169 static void |
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170 RxDrop (Ptr<const Packet> p) |
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171 { |
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172 NS_LOG_UNCOND ("RxDrop at " << Simulator::Now ().GetSeconds ()); |
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173 } |
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174 |
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175 int |
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176 main (int argc, char *argv[]) |
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177 { |
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178 NodeContainer nodes; |
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179 nodes.Create (2); |
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180 |
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181 PointToPointHelper pointToPoint; |
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182 pointToPoint.SetDeviceAttribute ("DataRate", StringValue ("1Mbps")); |
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183 pointToPoint.SetChannelAttribute ("Delay", StringValue ("2ms")); |
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184 |
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185 NetDeviceContainer devices; |
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186 devices = pointToPoint.Install (nodes); |
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187 |
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188 Ptr<RateErrorModel> em = CreateObjectWithAttributes<RateErrorModel> ( |
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189 "RanVar", RandomVariableValue (UniformVariable (0., 1.)), |
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190 "ErrorRate", DoubleValue (0.00001)); |
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191 devices.Get (1)->SetAttribute ("ReceiveErrorModel", PointerValue (em)); |
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192 |
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193 InternetStackHelper stack; |
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194 stack.Install (nodes); |
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195 |
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196 Ipv4AddressHelper address; |
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197 address.SetBase ("10.1.1.0", "255.255.255.252"); |
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198 Ipv4InterfaceContainer interfaces = address.Assign (devices); |
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199 |
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200 uint16_t sinkPort = 8080; |
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201 Address sinkAddress (InetSocketAddress(interfaces.GetAddress (1), sinkPort)); |
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202 PacketSinkHelper packetSinkHelper ("ns3::TcpSocketFactory", InetSocketAddress (Ipv4Address::GetAny (), sinkPort)); |
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203 ApplicationContainer sinkApps = packetSinkHelper.Install (nodes.Get (1)); |
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204 sinkApps.Start (Seconds (0.)); |
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205 sinkApps.Stop (Seconds (20.)); |
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206 |
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207 Ptr<Socket> ns3TcpSocket = Socket::CreateSocket (nodes.Get (0), TcpSocketFactory::GetTypeId ()); |
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208 ns3TcpSocket->TraceConnectWithoutContext ("CongestionWindow", MakeCallback (&CwndChange)); |
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209 |
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210 Ptr<SimpleSource> app = CreateObject<SimpleSource> (); |
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211 app->Setup (ns3TcpSocket, sinkAddress, 1040, 1000, DataRate ("5Mbps")); |
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212 nodes.Get (0)->AddApplication (app); |
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213 app->Start (Seconds (1.)); |
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214 app->Stop (Seconds (20.)); |
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215 |
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216 devices.Get (1)->TraceConnectWithoutContext("PhyRxDrop", MakeCallback (&RxDrop)); |
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217 |
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218 Simulator::Stop (Seconds(20)); |
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219 Simulator::Run (); |
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220 Simulator::Destroy (); |
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221 |
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222 return 0; |
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223 } |
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224 |