How to Implement network Source Location Privacy in ns3

To implement the network source location privacy (SLP) in ns3 has needs to generate an emulation where the location of the communication is covered or protected to mitigate the observers from indicative the source node. This is specifically helpful in the scenarios such as wireless sensor networks where safeguard the source location is vital. The given below is the step-by-procedure on how to implement the source location privacy in ns3:

Step-by-Step Implementation:

Step 1: Set Up ns3 Environment

1. Install ns3: Install and download the ns3 in the system.
2. Familiarize yourself with ns3: Read through the ns3 tutorial to familiarize the simple concepts and structure of ns3 simulations.

Step 2: Define the Network Topology

1. Create a Simple Network: Describe the simple network topology using ns3. This includes to creating nodes, setting up channels, and configuring IP addresses. We’ll use a simple topology for this instance.

Step 3: Implement Source Location Privacy

To implement SLP, we can use techniques like:

1. Random Walk: Nodes can follow a random walk to forward packets, thereby obfuscating the actual source.
2. Dummy Traffic: To confuse eavesdropper’s nodes can make dummy traffic.
3. Phantom Routing: Use a phantom source node to relay messages to the actual destination.

The given below are the instance snippets to implement the basic SLP mechanism using random walk and dummy traffic:

C++ Code for ns3 Simulation (main.cc)

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/internet-module.h”

#include “ns3/point-to-point-module.h”

#include “ns3/applications-module.h”

#include <iostream>

#include <vector>

#include <cstdlib>

#include <ctime>

using namespace ns3;

class SLPApp : public Application

{

public:

SLPApp() : m_packetsReceived(0) {}

virtual ~SLPApp() {}

void Setup(Address address, uint16_t port, NodeContainer allNodes)

{

m_peerAddress = address;

m_peerPort = port;

m_allNodes = allNodes;

}

private:

virtual void StartApplication()

{

m_socket = Socket::CreateSocket(GetNode(), TypeId::LookupByName(“ns3::UdpSocketFactory”));

m_socket->Bind();

m_socket->Connect(InetSocketAddress(m_peerAddress, m_peerPort));

// Schedule the first packet transmission

Simulator::Schedule(Seconds(1.0), &SLPApp::SendPacket, this);

// Schedule dummy traffic generation

Simulator::Schedule(Seconds(2.0), &SLPApp::GenerateDummyTraffic, this);

// Set up the receive callback

m_socket->SetRecvCallback(MakeCallback(&SLPApp::ReceivePacket, this));

}

virtual void StopApplication()

{

if (m_socket)

{

m_socket->Close();

m_socket = 0;

}

}

void SendPacket()

{

std::string message = “Sensitive data”;

Ptr<Packet> packet = Create<Packet>((uint8_t *)message.c_str(), message.size());

Ptr<Node> nextHop = ChooseRandomNextHop();

Ipv4Address nextHopAddress = nextHop->GetObject<Ipv4>()->GetAddress(1, 0).GetLocal();

m_socket->Connect(InetSocketAddress(nextHopAddress, m_peerPort));

m_socket->Send(packet);

// Schedule the next packet transmission

Simulator::Schedule(Seconds(5.0), &SLPApp::SendPacket, this);

}

void ReceivePacket(Ptr<Socket> socket)

{

Ptr<Packet> packet = socket->Recv();

m_packetsReceived++;

// Print received message (for demonstration purposes)

uint8_t buffer[1024];

packet->CopyData(buffer, packet->GetSize());

std::string receivedMessage((char *)buffer, packet->GetSize());

std::cout << “Received message: ” << receivedMessage << std::endl;

// Forward packet to next hop

Ptr<Node> nextHop = ChooseRandomNextHop();

Ipv4Address nextHopAddress = nextHop->GetObject<Ipv4>()->GetAddress(1, 0).GetLocal();

socket->Connect(InetSocketAddress(nextHopAddress, m_peerPort));

socket->Send(packet);

}

Ptr<Node> ChooseRandomNextHop()

{

int randIndex = rand() % m_allNodes.GetN();

return m_allNodes.Get(randIndex);

}

void GenerateDummyTraffic()

{

std::string dummyMessage = “Dummy traffic”;

Ptr<Packet> dummyPacket = Create<Packet>((uint8_t *)dummyMessage.c_str(), dummyMessage.size());

Ptr<Node> nextHop = ChooseRandomNextHop();

Ipv4Address nextHopAddress = nextHop->GetObject<Ipv4>()->GetAddress(1, 0).GetLocal();

m_socket->Connect(InetSocketAddress(nextHopAddress, m_peerPort));

m_socket->Send(dummyPacket);

// Schedule the next dummy traffic generation

Simulator::Schedule(Seconds(2.0), &SLPApp::GenerateDummyTraffic, this);

}

Ptr<Socket> m_socket;

Address m_peerAddress;

uint16_t m_peerPort;

uint32_t m_packetsReceived;

NodeContainer m_allNodes; // All nodes in the network

};

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

{

// Initialize random seed

srand(time(0));

NodeContainer nodes;

nodes.Create(5); // Example: 5 nodes

PointToPointHelper pointToPoint;

pointToPoint.SetDeviceAttribute(“DataRate”, StringValue(“1Gbps”));

pointToPoint.SetChannelAttribute(“Delay”, StringValue(“2ms”));

NetDeviceContainer devices;

for (size_t i = 0; i < nodes.GetN(); ++i)

{

for (size_t j = i + 1; j < nodes.GetN(); ++j)

{

devices.Add(pointToPoint.Install(nodes.Get(i), nodes.Get(j)));

}

}

InternetStackHelper stack;

stack.Install(nodes);

Ipv4AddressHelper address;

address.SetBase(“10.1.1.0”, “255.255.255.0”);

for (size_t i = 0; i < devices.GetN(); ++i)

{

address.NewNetwork();

address.Assign(devices.Get(i));

}

uint16_t port = 9;

Ptr<SLPApp> sourceApp = CreateObject<SLPApp>();

sourceApp->Setup(InetSocketAddress(Ipv4Address(“255.255.255.255”), port), port, nodes);

nodes.Get(0)->AddApplication(sourceApp);

sourceApp->SetStartTime(Seconds(2.0));

sourceApp->SetStopTime(Seconds(60.0));

Ptr<SLPApp> receiverApp = CreateObject<SLPApp>();

receiverApp->Setup(InetSocketAddress(Ipv4Address::GetAny(), port), port, nodes);

nodes.Get(4)->AddApplication(receiverApp);

receiverApp->SetStartTime(Seconds(1.0));

receiverApp->SetStopTime(Seconds(60.0));

Simulator::Run();

Simulator::Destroy();

return 0;

}

Explanation:

1. Network Topology:
   • The network consists of 5 nodes interconnected with point-to-point links.
   • Each node can communicate with every other node.
2. SLPApp Class:
   • This custom application class manage to sending, receiving, and forwarding packets with SLP algorithm.
   • Setup method initializes the application with the peer address, port, and all nodes in the network.
   • StartApplication method sets up the socket connection, schedules packet transmission, and sets up the receive callback.
   • SendPacket method sends a message to a randomly chosen next hop.
   • ReceivePacket method receives a message, prints it (for demonstration purposes), and forwards it to the next hop.
   • ChooseRandomNextHop method selects a random next hop from the network nodes.
   • GenerateDummyTraffic method generates and sends dummy traffic to confuse eavesdroppers.
3. Main Function:
   • Creates a network with 5 nodes interrelated with point-to-point links.
   • Sets up IP addresses for the nodes.
   • Adjusts the SLPApp applications on the source and destination nodes.
   • The source node sends packets and dummy traffic, while the receiver node receives and forwards packets.

Compile and Run

1. Compile the Code: Compile the ns3 simulation code using the following command:

g++ -std=c++11 -o ns3-slp main.cc `pkg-config –cflags –libs ns3-dev`

1. Run the Simulation: Execute the compiled program:

./ns3-slp

In this setup we will see a simple implementation of source location privacy in ns3. We need to expand it more to contain more sophisticated SLP methods, additional nodes, and more complex network topologies as needed.

In the end, we clearly talk about how the source location privacy is implemented in ns3 tool that creates to network topology then apply the SLP methods to compile the results that were implemented using the ns3 tool.

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