1 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */

     2 /*

     3  * This program is free software; you can redistribute it and/or modify

     4  * it under the terms of the GNU General Public License version 2 as

     5  * published by the Free Software Foundation;

     6  *

     7  * This program is distributed in the hope that it will be useful,

     8  * but WITHOUT ANY WARRANTY; without even the implied warranty of

     9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    10  * GNU General Public License for more details.

    11  *

    12  * You should have received a copy of the GNU General Public License

    13  * along with this program; if not, write to the Free Software

    14  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    15  *

    16  */

    17 

    18 //

    19 // Network topology

    20 //

    21 //  n0

    22 //     \ 5 Mb/s, 2ms

    23 //      \          1.5Mb/s, 10ms

    24 //       n2 ------------------------n3

    25 //      /                          /

    26 //     / 5 Mb/s, 2ms              /

    27 //   n1--------------------------

    28 //          1.5 Mb/s, 100ms

    29 //

    30 // this is a modification of simple-global-routing to allow for

    31 // a single hop but higher-cost path between n1 and n3

    32 // 

    33 // - Tracing of queues and packet receptions to file "simple-rerouting.tr"

    34 

    35 #include <iostream>

    36 #include <fstream>

    37 #include <string>

    38 #include <cassert>

    39 

    40 #include "ns3/log.h"

    41 

    42 #include "ns3/command-line.h"

    43 #include "ns3/default-value.h"

    44 #include "ns3/ptr.h"

    45 #include "ns3/random-variable.h"

    46 

    47 #include "ns3/simulator.h"

    48 #include "ns3/nstime.h"

    49 #include "ns3/data-rate.h"

    50 

    51 #include "ns3/ascii-trace.h"

    52 #include "ns3/pcap-trace.h"

    53 #include "ns3/internet-node.h"

    54 #include "ns3/point-to-point-channel.h"

    55 #include "ns3/point-to-point-net-device.h"

    56 #include "ns3/ipv4-address.h"

    57 #include "ns3/ipv4.h"

    58 #include "ns3/socket.h"

    59 #include "ns3/inet-socket-address.h"

    60 #include "ns3/ipv4-route.h"

    61 #include "ns3/point-to-point-topology.h"

    62 #include "ns3/onoff-application.h"

    63 #include "ns3/packet-sink.h"

    64 #include "ns3/global-route-manager.h"

    65 

    66 using namespace ns3;

    67 

    68 NS_LOG_COMPONENT_DEFINE ("SimpleAlternateRoutingExample");

    69 

    70 int 

    71 main (int argc, char *argv[])

    72 {

    73   // Users may find it convenient to turn on explicit debugging

    74   // for selected modules; the below lines suggest how to do this

    75 #if 0 

    76   LogComponentEnable("GlobalRouteManager", LOG_LOGIC);

    77   LogComponentEnable("GlobalRouter", LOG_LOGIC);

    78   LogComponentEnable("Object", LOG_LEVEL_ALL);

    79   LogComponentEnable("Queue", LOG_LEVEL_ALL);

    80   LogComponentEnable("DropTailQueue", LOG_LEVEL_ALL);

    81   LogComponentEnable("Channel", LOG_LEVEL_ALL);

    82   LogComponentEnable("CsmaChannel", LOG_LEVEL_ALL);

    83   LogComponentEnable("NetDevice", LOG_LEVEL_ALL);

    84   LogComponentEnable("CsmaNetDevice", LOG_LEVEL_ALL);

    85   LogComponentEnable("Ipv4L3Protocol", LOG_LEVEL_ALL);

    86   LogComponentEnable("PacketSocket", LOG_LEVEL_ALL);

    87   LogComponentEnable("Socket", LOG_LEVEL_ALL);

    88   LogComponentEnable("UdpSocket", LOG_LEVEL_ALL);

    89   LogComponentEnable("UdpL4Protocol", LOG_LEVEL_ALL);

    90   LogComponentEnable("Ipv4L3Protocol", LOG_LEVEL_ALL);

    91   LogComponentEnable("Ipv4StaticRouting", LOG_LEVEL_ALL);

    92   LogComponentEnable("Ipv4Interface", LOG_LEVEL_ALL);

    93   LogComponentEnable("ArpIpv4Interface", LOG_LEVEL_ALL);

    94   LogComponentEnable("Ipv4LoopbackInterface", LOG_LEVEL_ALL);

    95   LogComponentEnable("OnOffApplication", LOG_LEVEL_ALL);

    96   LogComponentEnable("PacketSinkApplication", LOG_LEVEL_ALL);

    97   LogComponentEnable("UdpEchoClientApplication", LOG_LEVEL_ALL);

    98   LogComponentEnable("UdpEchoServerApplication", LOG_LEVEL_ALL);

    99 #endif

   100   // Set up some default values for the simulation.  Use the 

   101   // DefaultValue::Bind () technique to tell the system what subclass of 

   102   // Queue to use, and what the queue limit is

   103 

   104   // The below Bind command tells the queue factory which class to

   105   // instantiate, when the queue factory is invoked in the topology code

   106   DefaultValue::Bind ("Queue", "DropTailQueue");

   107 

   108   DefaultValue::Bind ("OnOffApplicationPacketSize", "210");

   109   DefaultValue::Bind ("OnOffApplicationDataRate", "300b/s");

   110 

   111   // The below metric, if set to 3 or higher, will cause packets between

   112   // n1 and n3 to take the 2-hop route through n2

   113   // 

   114   // Additionally, we plumb this metric into the default value / command 

   115   // line argument system as well, for exemplary purposes.  This means 

   116   // that it can be resettable at the command-line to the program, 

   117   // rather than recompiling

   118   // e.g. waf --run "simple-alternate-routing --AlternateCost=5"

   119   uint16_t sampleMetric = 1;

   120   CommandLine::AddArgValue ("AlternateCost",

   121     "This metric is used in the example script between n3 and n1 ", 

   122     sampleMetric);

   123 

   124   // Allow the user to override any of the defaults and the above

   125   // DefaultValue::Bind ()s at run-time, via command-line arguments

   126   CommandLine::Parse (argc, argv);

   127 

   128   // Here, we will explicitly create four nodes.  In more sophisticated

   129   // topologies, we could configure a node factory.

   130   NS_LOG_INFO ("Create nodes.");

   131   Ptr<Node> n0 = Create<InternetNode> ();

   132   Ptr<Node> n1 = Create<InternetNode> (); 

   133   Ptr<Node> n2 = Create<InternetNode> (); 

   134   Ptr<Node> n3 = Create<InternetNode> ();

   135 

   136   // We create the channels first without any IP addressing information

   137   NS_LOG_INFO ("Create channels.");

   138   Ptr<PointToPointChannel> channel0 = 

   139     PointToPointTopology::AddPointToPointLink (

   140       n0, n2, DataRate (5000000), MilliSeconds (2));

   141 

   142   Ptr<PointToPointChannel> channel1 = 

   143     PointToPointTopology::AddPointToPointLink (

   144       n1, n2, DataRate (5000000), MilliSeconds (2));

   145   

   146   Ptr<PointToPointChannel> channel2 = 

   147     PointToPointTopology::AddPointToPointLink (

   148       n2, n3, DataRate (1500000), MilliSeconds (10));

   149   

   150   Ptr<PointToPointChannel> channel3 = 

   151     PointToPointTopology::AddPointToPointLink (

   152       n1, n3, DataRate (1500000), MilliSeconds (100));

   153   

   154   // Later, we add IP addresses.  The middle two octets correspond to 

   155  // the channel number.  

   156   NS_LOG_INFO ("Assign IP Addresses.");

   157   PointToPointTopology::AddIpv4Addresses (

   158       channel0, n0, Ipv4Address ("10.0.0.1"),

   159       n2, Ipv4Address ("10.0.0.2"));

   160   

   161   PointToPointTopology::AddIpv4Addresses (

   162       channel1, n1, Ipv4Address ("10.1.1.1"),

   163       n2, Ipv4Address ("10.1.1.2"));

   164   

   165   PointToPointTopology::AddIpv4Addresses (

   166       channel2, n2, Ipv4Address ("10.2.2.1"),

   167       n3, Ipv4Address ("10.2.2.2"));

   168 

   169   PointToPointTopology::AddIpv4Addresses (

   170       channel3, n1, Ipv4Address ("10.3.3.1"),

   171       n3, Ipv4Address ("10.3.3.2"));

   172 

   173   PointToPointTopology::SetIpv4Metric (

   174       channel3, n1, n3, sampleMetric);

   175 

   176   // Create router nodes, initialize routing database and set up the routing

   177   // tables in the nodes.

   178   GlobalRouteManager::PopulateRoutingTables ();

   179 

   180   // Create the OnOff application to send UDP datagrams 

   181   NS_LOG_INFO ("Create Application.");

   182   uint16_t port = 9;   // Discard port (RFC 863)

   183 

   184   // Create a flow from n3 to n1, starting at time 1.1 seconds

   185   Ptr<OnOffApplication> ooff = Create<OnOffApplication> (

   186     n3, 

   187     InetSocketAddress ("10.1.1.1", port),

   188     "Udp",

   189     ConstantVariable (1), 

   190     ConstantVariable (0));

   191   // Start the application

   192   ooff->Start (Seconds (1.1));

   193   ooff->Stop (Seconds (10.0));

   194 

   195   // Create a packet sink to receive these packets

   196   Ptr<PacketSink> sink = Create<PacketSink> (

   197     n1, 

   198     InetSocketAddress (Ipv4Address::GetAny (), port), 

   199     "Udp");

   200   // Start the sink

   201   sink->Start (Seconds (1.1));

   202   sink->Stop (Seconds (10.0));

   203 

   204   // Configure tracing of all enqueue, dequeue, and NetDevice receive events

   205   // Trace output will be sent to the simple-alternate-routing.tr file

   206   NS_LOG_INFO ("Configure Tracing.");

   207   AsciiTrace asciitrace ("simple-alternate-routing.tr");

   208   asciitrace.TraceAllQueues ();

   209   asciitrace.TraceAllNetDeviceRx ();

   210 

   211   // Also configure some tcpdump traces; each interface will be traced

   212   // The output files will be named simple-p2p.pcap-<nodeId>-<interfaceId>

   213   // and can be read by the "tcpdump -r" command (use "-tt" option to

   214   // display timestamps correctly)

   215   PcapTrace pcaptrace ("simple-alternate-routing.pcap");

   216   pcaptrace.TraceAllIp ();

   217 

   218   NS_LOG_INFO ("Run Simulation.");

   219   Simulator::Run ();

   220   Simulator::Destroy ();

   221   NS_LOG_INFO ("Done.");

   222 

   223   return 0;

   224 }