unison/src/internet/test/udp-test.cc

/*
 * Copyright (c) 2007 Georgia Tech Research Corporation
 *
 * 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
 *
 * Author: Raj Bhattacharjea <raj.b@gatech.edu>
 */
/**
 * This is the test code for udp-socket-impl.cc, it was moved out of udp-socket-impl.cc to
 * be in an independent file for clarity purposes.
 */

#include "ns3/arp-l3-protocol.h"
#include "ns3/boolean.h"
#include "ns3/icmpv4-l4-protocol.h"
#include "ns3/icmpv6-l4-protocol.h"
#include "ns3/inet-socket-address.h"
#include "ns3/inet6-socket-address.h"
#include "ns3/internet-stack-helper.h"
#include "ns3/ipv4-l3-protocol.h"
#include "ns3/ipv4-list-routing.h"
#include "ns3/ipv4-queue-disc-item.h"
#include "ns3/ipv4-static-routing.h"
#include "ns3/ipv6-address-helper.h"
#include "ns3/ipv6-l3-protocol.h"
#include "ns3/ipv6-list-routing.h"
#include "ns3/ipv6-static-routing.h"
#include "ns3/log.h"
#include "ns3/node.h"
#include "ns3/simple-channel.h"
#include "ns3/simple-net-device-helper.h"
#include "ns3/simple-net-device.h"
#include "ns3/simulator.h"
#include "ns3/socket-factory.h"
#include "ns3/socket.h"
#include "ns3/tcp-l4-protocol.h"
#include "ns3/test.h"
#include "ns3/traffic-control-helper.h"
#include "ns3/udp-l4-protocol.h"
#include "ns3/udp-socket-factory.h"

#include <limits>
#include <string>

using namespace ns3;

/**
 * \ingroup internet-test
 *
 * \brief UDP Socket Loopback over IPv4 Test
 */
class UdpSocketLoopbackTest : public TestCase
{
  public:
    UdpSocketLoopbackTest();
    void DoRun() override;

    /**
     * \brief Receive a packet.
     * \param socket The receiving socket.
     */
    void ReceivePkt(Ptr<Socket> socket);
    Ptr<Packet> m_receivedPacket; //!< Received packet
};

UdpSocketLoopbackTest::UdpSocketLoopbackTest()
    : TestCase("UDP loopback test")
{
}

void
UdpSocketLoopbackTest::ReceivePkt(Ptr<Socket> socket)
{
    uint32_t availableData;
    availableData = socket->GetRxAvailable();
    m_receivedPacket = socket->Recv(std::numeric_limits<uint32_t>::max(), 0);
    NS_TEST_ASSERT_MSG_EQ(availableData,
                          m_receivedPacket->GetSize(),
                          "ReceivedPacket size is not equal to the Rx buffer size");
}

void
UdpSocketLoopbackTest::DoRun()
{
    Ptr<Node> rxNode = CreateObject<Node>();
    InternetStackHelper internet;
    internet.Install(rxNode);

    Ptr<SocketFactory> rxSocketFactory = rxNode->GetObject<UdpSocketFactory>();
    Ptr<Socket> rxSocket = rxSocketFactory->CreateSocket();
    rxSocket->Bind(InetSocketAddress(Ipv4Address::GetAny(), 80));
    rxSocket->SetRecvCallback(MakeCallback(&UdpSocketLoopbackTest::ReceivePkt, this));

    Ptr<Socket> txSocket = rxSocketFactory->CreateSocket();
    txSocket->SendTo(Create<Packet>(246), 0, InetSocketAddress("127.0.0.1", 80));
    Simulator::Run();
    Simulator::Destroy();
    NS_TEST_EXPECT_MSG_EQ(m_receivedPacket->GetSize(),
                          246,
                          "first socket should not receive it (it is bound specifically to the "
                          "second interface's address");
}

/**
 * \ingroup internet-test
 *
 * \brief UDP Socket Loopback over IPv6 Test
 */
class Udp6SocketLoopbackTest : public TestCase
{
  public:
    Udp6SocketLoopbackTest();
    void DoRun() override;

    /**
     * \brief Receive a packet.
     * \param socket The receiving socket.
     */
    void ReceivePkt(Ptr<Socket> socket);
    Ptr<Packet> m_receivedPacket; //!< Received packet
};

Udp6SocketLoopbackTest::Udp6SocketLoopbackTest()
    : TestCase("UDP6 loopback test")
{
}

void
Udp6SocketLoopbackTest::ReceivePkt(Ptr<Socket> socket)
{
    uint32_t availableData [[maybe_unused]] = socket->GetRxAvailable();
    m_receivedPacket = socket->Recv(std::numeric_limits<uint32_t>::max(), 0);
    NS_TEST_ASSERT_MSG_EQ(availableData,
                          m_receivedPacket->GetSize(),
                          "ReceivedPacket size is not equal to the Rx buffer size");
}

void
Udp6SocketLoopbackTest::DoRun()
{
    Ptr<Node> rxNode = CreateObject<Node>();
    InternetStackHelper internet;
    internet.Install(rxNode);

    Ptr<SocketFactory> rxSocketFactory = rxNode->GetObject<UdpSocketFactory>();
    Ptr<Socket> rxSocket = rxSocketFactory->CreateSocket();
    rxSocket->Bind(Inet6SocketAddress(Ipv6Address::GetAny(), 80));
    rxSocket->SetRecvCallback(MakeCallback(&Udp6SocketLoopbackTest::ReceivePkt, this));

    Ptr<Socket> txSocket = rxSocketFactory->CreateSocket();
    txSocket->SendTo(Create<Packet>(246), 0, Inet6SocketAddress("::1", 80));
    Simulator::Run();
    Simulator::Destroy();
    NS_TEST_EXPECT_MSG_EQ(m_receivedPacket->GetSize(),
                          246,
                          "first socket should not receive it (it is bound specifically to the "
                          "second interface's address");
}

/**
 * \ingroup internet-test
 *
 * \brief UDP Socket over IPv4 Test
 */
class UdpSocketImplTest : public TestCase
{
    Ptr<Packet> m_receivedPacket;        //!< Received packet (1).
    Ptr<Packet> m_receivedPacket2;       //!< Received packet (2).
    Ptr<Ipv4QueueDiscItem> m_sentPacket; //!< Sent packet.

    /**
     * \brief Get the TOS of the received packet.
     * \returns The TOS.
     */
    uint32_t GetTos();

    /**
     * \brief Get the priority of the received packet.
     * \returns The priority.
     */
    uint32_t GetPriority();

    /**
     * \brief Send data.
     * \param socket The sending socket.
     * \param to The destination address.
     */
    void DoSendDataTo(Ptr<Socket> socket, std::string to);
    /**
     * \brief Send data.
     * \param socket The sending socket.
     * \param to The destination address.
     */
    void SendDataTo(Ptr<Socket> socket, std::string to);
    /**
     * \brief Send data.
     * \param socket The sending socket.
     */
    void DoSendData(Ptr<Socket> socket);
    /**
     * \brief Send data.
     * \param socket The sending socket.
     */
    void SendData(Ptr<Socket> socket);

  public:
    void DoRun() override;
    UdpSocketImplTest();

    /**
     * \brief Receive packets (1).
     * \param socket The receiving socket.
     */
    void ReceivePkt(Ptr<Socket> socket);
    /**
     * \brief Receive packets (2).
     * \param socket The receiving socket.
     */
    void ReceivePkt2(Ptr<Socket> socket);

    /**
     * \brief Adds a packet to the list of sent packets.
     * \param item The sent packet.
     */
    void SentPkt(Ptr<const QueueDiscItem> item);
};

UdpSocketImplTest::UdpSocketImplTest()
    : TestCase("UDP socket implementation")
{
}

void
UdpSocketImplTest::ReceivePkt(Ptr<Socket> socket)
{
    uint32_t availableData;
    availableData = socket->GetRxAvailable();
    m_receivedPacket = socket->Recv(std::numeric_limits<uint32_t>::max(), 0);
    NS_TEST_ASSERT_MSG_EQ(availableData,
                          m_receivedPacket->GetSize(),
                          "ReceivedPacket size is not equal to the Rx buffer size");
}

void
UdpSocketImplTest::ReceivePkt2(Ptr<Socket> socket)
{
    uint32_t availableData;
    availableData = socket->GetRxAvailable();
    m_receivedPacket2 = socket->Recv(std::numeric_limits<uint32_t>::max(), 0);
    NS_TEST_ASSERT_MSG_EQ(availableData,
                          m_receivedPacket2->GetSize(),
                          "ReceivedPacket size is not equal to the Rx buffer size");
}

void
UdpSocketImplTest::SentPkt(Ptr<const QueueDiscItem> item)
{
    Ptr<const Ipv4QueueDiscItem> ipv4Item = DynamicCast<const Ipv4QueueDiscItem>(item);
    NS_TEST_EXPECT_MSG_NE(ipv4Item, nullptr, "no IPv4 packet");
    Address addr;
    m_sentPacket =
        Create<Ipv4QueueDiscItem>(ipv4Item->GetPacket()->Copy(), addr, 0, ipv4Item->GetHeader());
}

uint32_t
UdpSocketImplTest::GetTos()
{
    return static_cast<uint32_t>(m_sentPacket->GetHeader().GetTos());
}

uint32_t
UdpSocketImplTest::GetPriority()
{
    SocketPriorityTag priorityTag;
    bool found = m_sentPacket->GetPacket()->PeekPacketTag(priorityTag);
    NS_TEST_EXPECT_MSG_EQ(found, true, "the packet should carry a SocketPriorityTag");
    return static_cast<uint32_t>(priorityTag.GetPriority());
}

void
UdpSocketImplTest::DoSendDataTo(Ptr<Socket> socket, std::string to)
{
    Address realTo = InetSocketAddress(Ipv4Address(to.c_str()), 1234);
    NS_TEST_EXPECT_MSG_EQ(socket->SendTo(Create<Packet>(123), 0, realTo), 123, "100");
}

void
UdpSocketImplTest::SendDataTo(Ptr<Socket> socket, std::string to)
{
    m_receivedPacket = Create<Packet>();
    m_receivedPacket2 = Create<Packet>();
    Simulator::ScheduleWithContext(socket->GetNode()->GetId(),
                                   Seconds(0),
                                   &UdpSocketImplTest::DoSendDataTo,
                                   this,
                                   socket,
                                   to);
    Simulator::Run();
}

void
UdpSocketImplTest::DoSendData(Ptr<Socket> socket)
{
    NS_TEST_EXPECT_MSG_EQ(socket->Send(Create<Packet>(123), 0), 123, "100");
}

void
UdpSocketImplTest::SendData(Ptr<Socket> socket)
{
    Simulator::ScheduleWithContext(socket->GetNode()->GetId(),
                                   Seconds(0),
                                   &UdpSocketImplTest::DoSendData,
                                   this,
                                   socket);
    Simulator::Run();
}

void
UdpSocketImplTest::DoRun()
{
    // Create topology

    // Receiver Node
    Ptr<Node> rxNode = CreateObject<Node>();
    // Sender Node
    Ptr<Node> txNode = CreateObject<Node>();

    NodeContainer nodes(rxNode, txNode);

    SimpleNetDeviceHelper helperChannel1;
    helperChannel1.SetNetDevicePointToPointMode(true);
    NetDeviceContainer net1 = helperChannel1.Install(nodes);

    SimpleNetDeviceHelper helperChannel2;
    helperChannel2.SetNetDevicePointToPointMode(true);
    NetDeviceContainer net2 = helperChannel2.Install(nodes);

    InternetStackHelper internet;
    internet.Install(nodes);

    TrafficControlHelper tch = TrafficControlHelper::Default();
    QueueDiscContainer qdiscs = tch.Install(net1.Get(1));

    Ptr<Ipv4> ipv4;
    uint32_t netdev_idx;
    Ipv4InterfaceAddress ipv4Addr;

    // Receiver Node
    ipv4 = rxNode->GetObject<Ipv4>();
    netdev_idx = ipv4->AddInterface(net1.Get(0));
    ipv4Addr = Ipv4InterfaceAddress(Ipv4Address("10.0.0.1"), Ipv4Mask("/24"));
    ipv4->AddAddress(netdev_idx, ipv4Addr);
    ipv4->SetUp(netdev_idx);

    netdev_idx = ipv4->AddInterface(net2.Get(0));
    ipv4Addr = Ipv4InterfaceAddress(Ipv4Address("10.0.1.1"), Ipv4Mask("/24"));
    ipv4->AddAddress(netdev_idx, ipv4Addr);
    ipv4->SetUp(netdev_idx);

    // Sender Node
    ipv4 = txNode->GetObject<Ipv4>();
    netdev_idx = ipv4->AddInterface(net1.Get(1));
    ipv4Addr = Ipv4InterfaceAddress(Ipv4Address("10.0.0.2"), Ipv4Mask("/24"));
    ipv4->AddAddress(netdev_idx, ipv4Addr);
    ipv4->SetUp(netdev_idx);

    netdev_idx = ipv4->AddInterface(net2.Get(1));
    ipv4Addr = Ipv4InterfaceAddress(Ipv4Address("10.0.1.2"), Ipv4Mask("/24"));
    ipv4->AddAddress(netdev_idx, ipv4Addr);
    ipv4->SetUp(netdev_idx);

    // Create the UDP sockets
    Ptr<SocketFactory> rxSocketFactory = rxNode->GetObject<UdpSocketFactory>();

    Ptr<Socket> rxSocket = rxSocketFactory->CreateSocket();
    NS_TEST_EXPECT_MSG_EQ(rxSocket->Bind(InetSocketAddress(Ipv4Address("10.0.0.1"), 1234)),
                          0,
                          "trivial");
    rxSocket->SetRecvCallback(MakeCallback(&UdpSocketImplTest::ReceivePkt, this));

    Ptr<Socket> rxSocket2 = rxSocketFactory->CreateSocket();
    NS_TEST_EXPECT_MSG_EQ(rxSocket2->Bind(InetSocketAddress(Ipv4Address("10.0.1.1"), 1234)),
                          0,
                          "trivial");
    rxSocket2->SetRecvCallback(MakeCallback(&UdpSocketImplTest::ReceivePkt2, this));

    Ptr<SocketFactory> txSocketFactory = txNode->GetObject<UdpSocketFactory>();
    Ptr<Socket> txSocket = txSocketFactory->CreateSocket();
    txSocket->SetAllowBroadcast(true);

    // ------ Now the tests ------------

    // Unicast test
    SendDataTo(txSocket, "10.0.0.1");
    NS_TEST_EXPECT_MSG_EQ(m_receivedPacket->GetSize(), 123, "trivial");
    NS_TEST_EXPECT_MSG_EQ(m_receivedPacket2->GetSize(),
                          0,
                          "second interface should not receive it");

    m_receivedPacket->RemoveAllByteTags();
    m_receivedPacket2->RemoveAllByteTags();

    // Simple broadcast test

    SendDataTo(txSocket, "255.255.255.255");
    NS_TEST_EXPECT_MSG_EQ(m_receivedPacket->GetSize(),
                          0,
                          "first socket should not receive it (it is bound specifically to the "
                          "first interface's address");
    NS_TEST_EXPECT_MSG_EQ(m_receivedPacket2->GetSize(),
                          0,
                          "second socket should not receive it (it is bound specifically to the "
                          "second interface's address");

    m_receivedPacket->RemoveAllByteTags();
    m_receivedPacket2->RemoveAllByteTags();

    // Broadcast test with multiple receiving sockets

    // When receiving broadcast packets, all sockets sockets bound to
    // the address/port should receive a copy of the same packet -- if
    // the socket address matches.
    rxSocket2->Dispose();
    rxSocket2 = rxSocketFactory->CreateSocket();
    rxSocket2->SetRecvCallback(MakeCallback(&UdpSocketImplTest::ReceivePkt2, this));
    NS_TEST_EXPECT_MSG_EQ(rxSocket2->Bind(InetSocketAddress(Ipv4Address("0.0.0.0"), 1234)),
                          0,
                          "trivial");

    SendDataTo(txSocket, "255.255.255.255");
    NS_TEST_EXPECT_MSG_EQ(m_receivedPacket->GetSize(),
                          0,
                          "first socket should not receive it (it is bound specifically to the "
                          "first interface's address");
    NS_TEST_EXPECT_MSG_EQ(m_receivedPacket2->GetSize(), 123, "trivial");

    m_receivedPacket = nullptr;
    m_receivedPacket2 = nullptr;

    // Simple Link-local multicast test

    txSocket->BindToNetDevice(net1.Get(1));
    SendDataTo(txSocket, "224.0.0.9");
    NS_TEST_EXPECT_MSG_EQ(m_receivedPacket->GetSize(),
                          0,
                          "first socket should not receive it (it is bound specifically to the "
                          "first interface's address");
    NS_TEST_EXPECT_MSG_EQ(m_receivedPacket2->GetSize(), 123, "recv2: 224.0.0.9");

    m_receivedPacket->RemoveAllByteTags();
    m_receivedPacket2->RemoveAllByteTags();

    // Simple getpeername tests

    Address peerAddress;
    int err = txSocket->GetPeerName(peerAddress);
    NS_TEST_EXPECT_MSG_EQ(err, -1, "socket GetPeerName() should fail when socket is not connected");
    NS_TEST_EXPECT_MSG_EQ(txSocket->GetErrno(),
                          Socket::ERROR_NOTCONN,
                          "socket error code should be ERROR_NOTCONN");

    InetSocketAddress peer("10.0.0.1", 1234);
    err = txSocket->Connect(peer);
    NS_TEST_EXPECT_MSG_EQ(err, 0, "socket Connect() should succeed");

    err = txSocket->GetPeerName(peerAddress);
    NS_TEST_EXPECT_MSG_EQ(err, 0, "socket GetPeerName() should succeed when socket is connected");
    NS_TEST_EXPECT_MSG_EQ(peerAddress,
                          peer,
                          "address from socket GetPeerName() should equal the connected address");

    m_receivedPacket->RemoveAllByteTags();
    m_receivedPacket2->RemoveAllByteTags();

    // TOS and priority tests

    // Intercept the packets dequeued by the queue disc on the sender node
    qdiscs.Get(0)->TraceConnectWithoutContext("Dequeue",
                                              MakeCallback(&UdpSocketImplTest::SentPkt, this));

    // The socket is not connected.
    txSocket->SetIpTos(0x28); // AF11
    txSocket->SetPriority(6); // Interactive
    // Send a packet to a specified destination:
    // - for not connected sockets, the tos specified in the destination address (0) is used
    // - since the tos is zero, the priority set for the socket is used
    SendDataTo(txSocket, "10.0.0.1");
    NS_TEST_EXPECT_MSG_EQ(m_receivedPacket->GetSize(), 123, "trivial");

    NS_TEST_EXPECT_MSG_EQ(GetTos(), 0, "the TOS should be set to 0");
    NS_TEST_EXPECT_MSG_EQ(GetPriority(), 6, "Interactive (6)");

    m_receivedPacket->RemoveAllByteTags();

    InetSocketAddress dest("10.0.0.1", 1234);
    dest.SetTos(0xb8); // EF
    // the connect operation sets the tos (and priority) for the socket
    NS_TEST_EXPECT_MSG_EQ(txSocket->Connect(dest), 0, "the connect operation failed");

    SendData(txSocket);
    NS_TEST_EXPECT_MSG_EQ(m_receivedPacket->GetSize(), 123, "trivial");

    NS_TEST_EXPECT_MSG_EQ(GetTos(), 0xb8, "the TOS should be set to 0xb8");
    NS_TEST_EXPECT_MSG_EQ(GetPriority(), 4, "Interactive bulk (4)");

    m_receivedPacket->RemoveAllByteTags();

    Simulator::Destroy();
}

/**
 * \ingroup internet-test
 *
 * \brief UDP Socket over IPv6 Test
 */
class Udp6SocketImplTest : public TestCase
{
    Ptr<Packet> m_receivedPacket;  //!< Received packet (1).
    Ptr<Packet> m_receivedPacket2; //!< Received packet (2).

    /**
     * \brief Send data.
     * \param socket The sending socket.
     * \param to The destination address.
     */
    void DoSendDataTo(Ptr<Socket> socket, std::string to);
    /**
     * \brief Send data.
     * \param socket The sending socket.
     * \param to The destination address.
     */
    void SendDataTo(Ptr<Socket> socket, std::string to);

  public:
    void DoRun() override;
    Udp6SocketImplTest();

    /**
     * \brief Receive packets (1).
     * \param socket The receiving socket.
     * \param packet The received packet.
     * \param from The source address.
     */
    void ReceivePacket(Ptr<Socket> socket, Ptr<Packet> packet, const Address& from);
    /**
     * \brief Receive packets (2).
     * \param socket The receiving socket.
     * \param packet The received packet.
     * \param from The source address.
     */
    void ReceivePacket2(Ptr<Socket> socket, Ptr<Packet> packet, const Address& from);
    /**
     * \brief Receive packets (1).
     * \param socket The receiving socket.
     */
    void ReceivePkt(Ptr<Socket> socket);
    /**
     * \brief Receive packets (2).
     * \param socket The receiving socket.
     */
    void ReceivePkt2(Ptr<Socket> socket);
};

Udp6SocketImplTest::Udp6SocketImplTest()
    : TestCase("UDP6 socket implementation")
{
}

void
Udp6SocketImplTest::ReceivePacket(Ptr<Socket> socket, Ptr<Packet> packet, const Address& from)
{
    m_receivedPacket = packet;
}

void
Udp6SocketImplTest::ReceivePacket2(Ptr<Socket> socket, Ptr<Packet> packet, const Address& from)
{
    m_receivedPacket2 = packet;
}

void
Udp6SocketImplTest::ReceivePkt(Ptr<Socket> socket)
{
    uint32_t availableData [[maybe_unused]] = socket->GetRxAvailable();
    m_receivedPacket = socket->Recv(std::numeric_limits<uint32_t>::max(), 0);
    NS_TEST_ASSERT_MSG_EQ(availableData,
                          m_receivedPacket->GetSize(),
                          "ReceivedPacket size is not equal to the Rx buffer size");
}

void
Udp6SocketImplTest::ReceivePkt2(Ptr<Socket> socket)
{
    uint32_t availableData [[maybe_unused]] = socket->GetRxAvailable();
    m_receivedPacket2 = socket->Recv(std::numeric_limits<uint32_t>::max(), 0);
    NS_TEST_ASSERT_MSG_EQ(availableData,
                          m_receivedPacket2->GetSize(),
                          "ReceivedPacket size is not equal to the Rx buffer size");
}

void
Udp6SocketImplTest::DoSendDataTo(Ptr<Socket> socket, std::string to)
{
    Address realTo = Inet6SocketAddress(Ipv6Address(to.c_str()), 1234);
    NS_TEST_EXPECT_MSG_EQ(socket->SendTo(Create<Packet>(123), 0, realTo), 123, "200");
}

void
Udp6SocketImplTest::SendDataTo(Ptr<Socket> socket, std::string to)
{
    m_receivedPacket = Create<Packet>();
    m_receivedPacket2 = Create<Packet>();
    Simulator::ScheduleWithContext(socket->GetNode()->GetId(),
                                   Seconds(0),
                                   &Udp6SocketImplTest::DoSendDataTo,
                                   this,
                                   socket,
                                   to);
    Simulator::Run();
}

void
Udp6SocketImplTest::DoRun()
{
    // Create topology

    // Receiver Node
    Ptr<Node> rxNode = CreateObject<Node>();
    // Sender Node
    Ptr<Node> txNode = CreateObject<Node>();

    NodeContainer nodes(rxNode, txNode);

    SimpleNetDeviceHelper helperChannel1;
    helperChannel1.SetNetDevicePointToPointMode(true);
    NetDeviceContainer net1 = helperChannel1.Install(nodes);

    SimpleNetDeviceHelper helperChannel2;
    helperChannel2.SetNetDevicePointToPointMode(true);
    NetDeviceContainer net2 = helperChannel2.Install(nodes);

    InternetStackHelper internetv6;
    internetv6.Install(nodes);

    txNode->GetObject<Icmpv6L4Protocol>()->SetAttribute("DAD", BooleanValue(false));
    rxNode->GetObject<Icmpv6L4Protocol>()->SetAttribute("DAD", BooleanValue(false));

    Ipv6AddressHelper ipv6helper;
    Ipv6InterfaceContainer iic1 = ipv6helper.AssignWithoutAddress(net1);
    Ipv6InterfaceContainer iic2 = ipv6helper.AssignWithoutAddress(net2);

    Ptr<NetDevice> device;
    Ptr<Ipv6> ipv6;
    int32_t ifIndex;
    Ipv6InterfaceAddress ipv6Addr;

    ipv6 = rxNode->GetObject<Ipv6>();
    device = net1.Get(0);
    ifIndex = ipv6->GetInterfaceForDevice(device);
    ipv6Addr = Ipv6InterfaceAddress(Ipv6Address("2001:0100::1"), Ipv6Prefix(64));
    ipv6->AddAddress(ifIndex, ipv6Addr);
    ipv6->SetUp(ifIndex);

    device = net2.Get(0);
    ifIndex = ipv6->GetInterfaceForDevice(device);
    ipv6Addr = Ipv6InterfaceAddress(Ipv6Address("2001:0100:1::1"), Ipv6Prefix(64));
    ipv6->AddAddress(ifIndex, ipv6Addr);
    ipv6->SetUp(ifIndex);

    ipv6 = txNode->GetObject<Ipv6>();
    device = net1.Get(1);
    ifIndex = ipv6->GetInterfaceForDevice(device);
    ipv6Addr = Ipv6InterfaceAddress(Ipv6Address("2001:0100::2"), Ipv6Prefix(64));
    ipv6->AddAddress(ifIndex, ipv6Addr);
    ipv6->SetUp(ifIndex);

    device = net2.Get(1);
    ifIndex = ipv6->GetInterfaceForDevice(device);
    ipv6Addr = Ipv6InterfaceAddress(Ipv6Address("2001:0100:1::2"), Ipv6Prefix(64));
    ipv6->AddAddress(ifIndex, ipv6Addr);
    ipv6->SetUp(ifIndex);

    // Create the UDP sockets
    Ptr<SocketFactory> rxSocketFactory = rxNode->GetObject<UdpSocketFactory>();
    Ptr<Socket> rxSocket = rxSocketFactory->CreateSocket();
    NS_TEST_EXPECT_MSG_EQ(rxSocket->Bind(Inet6SocketAddress(Ipv6Address("2001:0100::1"), 1234)),
                          0,
                          "trivial");
    rxSocket->SetRecvCallback(MakeCallback(&Udp6SocketImplTest::ReceivePkt, this));

    Ptr<Socket> rxSocket2 = rxSocketFactory->CreateSocket();
    rxSocket2->SetRecvCallback(MakeCallback(&Udp6SocketImplTest::ReceivePkt2, this));
    NS_TEST_EXPECT_MSG_EQ(rxSocket2->Bind(Inet6SocketAddress(Ipv6Address("2001:0100:1::1"), 1234)),
                          0,
                          "trivial");

    Ptr<SocketFactory> txSocketFactory = txNode->GetObject<UdpSocketFactory>();
    Ptr<Socket> txSocket = txSocketFactory->CreateSocket();
    txSocket->SetAllowBroadcast(true);
    // ------ Now the tests ------------

    // Unicast test
    SendDataTo(txSocket, "2001:0100::1");
    NS_TEST_EXPECT_MSG_EQ(m_receivedPacket->GetSize(), 123, "trivial");
    NS_TEST_EXPECT_MSG_EQ(m_receivedPacket2->GetSize(), 0, "second interface should receive it");

    m_receivedPacket->RemoveAllByteTags();
    m_receivedPacket2->RemoveAllByteTags();

    // Simple Link-local multicast test

    // When receiving broadcast packets, all sockets sockets bound to
    // the address/port should receive a copy of the same packet -- if
    // the socket address matches.
    rxSocket2->Dispose();
    rxSocket2 = rxSocketFactory->CreateSocket();
    rxSocket2->SetRecvCallback(MakeCallback(&Udp6SocketImplTest::ReceivePkt2, this));
    NS_TEST_EXPECT_MSG_EQ(rxSocket2->Bind(Inet6SocketAddress(Ipv6Address("::"), 1234)),
                          0,
                          "trivial");

    txSocket->BindToNetDevice(net1.Get(1));
    SendDataTo(txSocket, "ff02::1");
    NS_TEST_EXPECT_MSG_EQ(m_receivedPacket->GetSize(),
                          0,
                          "first socket should not receive it (it is bound specifically to the "
                          "second interface's address");
    NS_TEST_EXPECT_MSG_EQ(m_receivedPacket2->GetSize(), 123, "recv2: ff02::1");

    m_receivedPacket->RemoveAllByteTags();
    m_receivedPacket2->RemoveAllByteTags();

    // Simple getpeername tests
    Address peerAddress;
    int err = txSocket->GetPeerName(peerAddress);
    NS_TEST_EXPECT_MSG_EQ(err, -1, "socket GetPeerName() should fail when socket is not connected");
    NS_TEST_EXPECT_MSG_EQ(txSocket->GetErrno(),
                          Socket::ERROR_NOTCONN,
                          "socket error code should be ERROR_NOTCONN");

    Inet6SocketAddress peer("2001:0100::1", 1234);
    err = txSocket->Connect(peer);
    NS_TEST_EXPECT_MSG_EQ(err, 0, "socket Connect() should succeed");

    err = txSocket->GetPeerName(peerAddress);
    NS_TEST_EXPECT_MSG_EQ(err, 0, "socket GetPeerName() should succeed when socket is connected");
    NS_TEST_EXPECT_MSG_EQ(peerAddress,
                          peer,
                          "address from socket GetPeerName() should equal the connected address");

    Simulator::Destroy();
}

/**
 * \ingroup internet-test
 *
 * \brief UDP TestSuite
 */
class UdpTestSuite : public TestSuite
{
  public:
    UdpTestSuite()
        : TestSuite("udp", UNIT)
    {
        AddTestCase(new UdpSocketImplTest, TestCase::QUICK);
        AddTestCase(new UdpSocketLoopbackTest, TestCase::QUICK);
        AddTestCase(new Udp6SocketImplTest, TestCase::QUICK);
        AddTestCase(new Udp6SocketLoopbackTest, TestCase::QUICK);
    }
};

static UdpTestSuite g_udpTestSuite; //!< Static variable for test initialization