/* * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation; * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ /* Test program for multi-interface host, static routing Destination host (10.20.1.2) | | 10.20.1.0/24 DSTRTR 10.10.1.0/24 / \ 10.10.2.0/24 / \ Rtr1 Rtr2 10.1.1.0/24 | | 10.1.2.0/24 | / \ / Source */ #include "ns3/applications-module.h" #include "ns3/core-module.h" #include "ns3/internet-module.h" #include "ns3/ipv4-list-routing-helper.h" #include "ns3/ipv4-static-routing-helper.h" #include "ns3/network-module.h" #include "ns3/point-to-point-module.h" #include #include #include #include using namespace ns3; NS_LOG_COMPONENT_DEFINE("SocketBoundTcpRoutingExample"); static const uint32_t totalTxBytes = 20000; static uint32_t currentTxBytes = 0; static const uint32_t writeSize = 1040; uint8_t data[writeSize]; void StartFlow(Ptr, Ipv4Address, uint16_t); void WriteUntilBufferFull(Ptr, uint32_t); void SendStuff(Ptr sock, Ipv4Address dstaddr, uint16_t port); void BindSock(Ptr sock, Ptr netdev); void srcSocketRecv(Ptr socket); void dstSocketRecv(Ptr socket); int main(int argc, char* argv[]) { // Allow the user to override any of the defaults and the above // DefaultValue::Bind ()s at run-time, via command-line arguments CommandLine cmd(__FILE__); cmd.Parse(argc, argv); Ptr nSrc = CreateObject(); Ptr nDst = CreateObject(); Ptr nRtr1 = CreateObject(); Ptr nRtr2 = CreateObject(); Ptr nDstRtr = CreateObject(); NodeContainer c = NodeContainer(nSrc, nDst, nRtr1, nRtr2, nDstRtr); InternetStackHelper internet; internet.Install(c); // Point-to-point links NodeContainer nSrcnRtr1 = NodeContainer(nSrc, nRtr1); NodeContainer nSrcnRtr2 = NodeContainer(nSrc, nRtr2); NodeContainer nRtr1nDstRtr = NodeContainer(nRtr1, nDstRtr); NodeContainer nRtr2nDstRtr = NodeContainer(nRtr2, nDstRtr); NodeContainer nDstRtrnDst = NodeContainer(nDstRtr, nDst); // We create the channels first without any IP addressing information PointToPointHelper p2p; p2p.SetDeviceAttribute("DataRate", StringValue("5Mbps")); p2p.SetChannelAttribute("Delay", StringValue("2ms")); NetDeviceContainer dSrcdRtr1 = p2p.Install(nSrcnRtr1); NetDeviceContainer dSrcdRtr2 = p2p.Install(nSrcnRtr2); NetDeviceContainer dRtr1dDstRtr = p2p.Install(nRtr1nDstRtr); NetDeviceContainer dRtr2dDstRtr = p2p.Install(nRtr2nDstRtr); NetDeviceContainer dDstRtrdDst = p2p.Install(nDstRtrnDst); Ptr SrcToRtr1 = dSrcdRtr1.Get(0); Ptr SrcToRtr2 = dSrcdRtr2.Get(0); // Later, we add IP addresses. Ipv4AddressHelper ipv4; ipv4.SetBase("10.1.1.0", "255.255.255.0"); Ipv4InterfaceContainer iSrciRtr1 = ipv4.Assign(dSrcdRtr1); ipv4.SetBase("10.1.2.0", "255.255.255.0"); Ipv4InterfaceContainer iSrciRtr2 = ipv4.Assign(dSrcdRtr2); ipv4.SetBase("10.10.1.0", "255.255.255.0"); Ipv4InterfaceContainer iRtr1iDstRtr = ipv4.Assign(dRtr1dDstRtr); ipv4.SetBase("10.10.2.0", "255.255.255.0"); Ipv4InterfaceContainer iRtr2iDstRtr = ipv4.Assign(dRtr2dDstRtr); ipv4.SetBase("10.20.1.0", "255.255.255.0"); Ipv4InterfaceContainer iDstRtrDst = ipv4.Assign(dDstRtrdDst); Ptr ipv4Src = nSrc->GetObject(); Ptr ipv4Rtr1 = nRtr1->GetObject(); Ptr ipv4Rtr2 = nRtr2->GetObject(); Ptr ipv4DstRtr = nDstRtr->GetObject(); Ptr ipv4Dst = nDst->GetObject(); Ipv4StaticRoutingHelper ipv4RoutingHelper; Ptr staticRoutingSrc = ipv4RoutingHelper.GetStaticRouting(ipv4Src); Ptr staticRoutingRtr1 = ipv4RoutingHelper.GetStaticRouting(ipv4Rtr1); Ptr staticRoutingRtr2 = ipv4RoutingHelper.GetStaticRouting(ipv4Rtr2); Ptr staticRoutingDstRtr = ipv4RoutingHelper.GetStaticRouting(ipv4DstRtr); Ptr staticRoutingDst = ipv4RoutingHelper.GetStaticRouting(ipv4Dst); // Create static routes from Src to Dst staticRoutingRtr1->AddHostRouteTo(Ipv4Address("10.20.1.2"), Ipv4Address("10.10.1.2"), 2); staticRoutingRtr2->AddHostRouteTo(Ipv4Address("10.20.1.2"), Ipv4Address("10.10.2.2"), 2); // Two routes to same destination - setting separate metrics. // You can switch these to see how traffic gets diverted via different routes staticRoutingSrc->AddHostRouteTo(Ipv4Address("10.20.1.2"), Ipv4Address("10.1.1.2"), 1, 5); staticRoutingSrc->AddHostRouteTo(Ipv4Address("10.20.1.2"), Ipv4Address("10.1.2.2"), 2, 10); // Creating static routes from DST to Source pointing to Rtr1 VIA Rtr2(!) staticRoutingDst->AddHostRouteTo(Ipv4Address("10.1.1.1"), Ipv4Address("10.20.1.1"), 1); staticRoutingDstRtr->AddHostRouteTo(Ipv4Address("10.1.1.1"), Ipv4Address("10.10.2.1"), 2); staticRoutingRtr2->AddHostRouteTo(Ipv4Address("10.1.1.1"), Ipv4Address("10.1.2.1"), 1); staticRoutingDst->AddHostRouteTo(Ipv4Address("10.1.2.1"), Ipv4Address("10.20.1.1"), 1); staticRoutingDstRtr->AddHostRouteTo(Ipv4Address("10.1.2.1"), Ipv4Address("10.10.2.1"), 2); staticRoutingRtr2->AddHostRouteTo(Ipv4Address("10.1.2.1"), Ipv4Address("10.1.2.1"), 1); // There are no apps that can utilize the Socket Option so doing the work directly.. // Taken from tcp-large-transfer example Ptr srcSocket1 = Socket::CreateSocket(nSrc, TypeId::LookupByName("ns3::TcpSocketFactory")); Ptr srcSocket2 = Socket::CreateSocket(nSrc, TypeId::LookupByName("ns3::TcpSocketFactory")); Ptr srcSocket3 = Socket::CreateSocket(nSrc, TypeId::LookupByName("ns3::TcpSocketFactory")); Ptr srcSocket4 = Socket::CreateSocket(nSrc, TypeId::LookupByName("ns3::TcpSocketFactory")); uint16_t dstport = 12345; Ipv4Address dstaddr("10.20.1.2"); PacketSinkHelper sink("ns3::TcpSocketFactory", InetSocketAddress(Ipv4Address::GetAny(), dstport)); ApplicationContainer apps = sink.Install(nDst); apps.Start(Seconds(0.0)); apps.Stop(Seconds(10.0)); AsciiTraceHelper ascii; p2p.EnableAsciiAll(ascii.CreateFileStream("socket-bound-tcp-static-routing.tr")); p2p.EnablePcapAll("socket-bound-tcp-static-routing"); LogComponentEnableAll(LOG_PREFIX_TIME); LogComponentEnable("SocketBoundTcpRoutingExample", LOG_LEVEL_INFO); // First packet as normal (goes via Rtr1) Simulator::Schedule(Seconds(0.1), &StartFlow, srcSocket1, dstaddr, dstport); // Second via Rtr1 explicitly Simulator::Schedule(Seconds(1.0), &BindSock, srcSocket2, SrcToRtr1); Simulator::Schedule(Seconds(1.1), &StartFlow, srcSocket2, dstaddr, dstport); // Third via Rtr2 explicitly Simulator::Schedule(Seconds(2.0), &BindSock, srcSocket3, SrcToRtr2); Simulator::Schedule(Seconds(2.1), &StartFlow, srcSocket3, dstaddr, dstport); // Fourth again as normal (goes via Rtr1) Simulator::Schedule(Seconds(3.0), &BindSock, srcSocket4, Ptr(nullptr)); Simulator::Schedule(Seconds(3.1), &StartFlow, srcSocket4, dstaddr, dstport); // If you uncomment what's below, it results in ASSERT failing since you can't // bind to a socket not existing on a node // Simulator::Schedule(Seconds(4.0),&BindSock, srcSocket, dDstRtrdDst.Get(0)); Simulator::Run(); Simulator::Destroy(); return 0; } void BindSock(Ptr sock, Ptr netdev) { sock->BindToNetDevice(netdev); } void StartFlow(Ptr localSocket, Ipv4Address servAddress, uint16_t servPort) { NS_LOG_INFO("Starting flow at time " << Simulator::Now().GetSeconds()); currentTxBytes = 0; localSocket->Bind(); localSocket->Connect(InetSocketAddress(servAddress, servPort)); // connect // tell the tcp implementation to call WriteUntilBufferFull again // if we blocked and new tx buffer space becomes available localSocket->SetSendCallback(MakeCallback(&WriteUntilBufferFull)); WriteUntilBufferFull(localSocket, localSocket->GetTxAvailable()); } void WriteUntilBufferFull(Ptr localSocket, uint32_t txSpace) { while (currentTxBytes < totalTxBytes && localSocket->GetTxAvailable() > 0) { uint32_t left = totalTxBytes - currentTxBytes; uint32_t dataOffset = currentTxBytes % writeSize; uint32_t toWrite = writeSize - dataOffset; toWrite = std::min(toWrite, left); toWrite = std::min(toWrite, localSocket->GetTxAvailable()); int amountSent = localSocket->Send(&data[dataOffset], toWrite, 0); if (amountSent < 0) { // we will be called again when new tx space becomes available. return; } currentTxBytes += amountSent; } localSocket->Close(); }