olsr-routing-protocol.h

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/*
 * Copyright (c) 2004 Francisco J. Ros
 * Copyright (c) 2007 INESC Porto
 *
 * SPDX-License-Identifier: GPL-2.0-only
 *
 * Authors: Francisco J. Ros  <fjrm@dif.um.es>
 *          Gustavo J. A. M. Carneiro <gjc@inescporto.pt>
 */
 
#ifndef OLSR_AGENT_IMPL_H
#define OLSR_AGENT_IMPL_H
 
#include "olsr-header.h"
#include "olsr-repositories.h"
#include "olsr-state.h"
 
#include "ns3/event-garbage-collector.h"
#include "ns3/ipv4-routing-protocol.h"
#include "ns3/ipv4-static-routing.h"
#include "ns3/ipv4.h"
#include "ns3/node.h"
#include "ns3/object.h"
#include "ns3/packet.h"
#include "ns3/random-variable-stream.h"
#include "ns3/socket.h"
#include "ns3/test.h"
#include "ns3/timer.h"
#include "ns3/traced-callback.h"
 
#include <map>
#include <vector>
 
/// Testcase for MPR computation mechanism
class OlsrMprTestCase;
 
namespace ns3
{
namespace olsr
{
 
///
/// \defgroup olsr OLSR Routing
/// This section documents the API of the ns-3 OLSR module. For a generic
/// functional description, please refer to the ns-3 manual.
 
/// \ingroup olsr
/// An OLSR's routing table entry.
struct RoutingTableEntry
{
    Ipv4Address destAddr; //!< Address of the destination node.
    Ipv4Address nextAddr; //!< Address of the next hop.
    uint32_t interface;   //!< Interface index
    uint32_t distance;    //!< Distance in hops to the destination.
 
    RoutingTableEntry()
        : // default values
          destAddr(),
          nextAddr(),
          interface(0),
          distance(0)
    {
    }
};
 
class RoutingProtocol;
 
///
/// \ingroup olsr
///
/// \brief OLSR routing protocol for IPv4
///
class RoutingProtocol : public Ipv4RoutingProtocol
{
  public:
    /**
     * Declared friend to enable unit tests.
     */
    friend class ::OlsrMprTestCase;
 
    static const uint16_t OLSR_PORT_NUMBER; //!< port number (698)
 
    /**
     * \brief Get the type ID.
     * \return The object TypeId.
     */
    static TypeId GetTypeId();
 
    RoutingProtocol();
    ~RoutingProtocol() override;
 
    /**
     * \brief Set the OLSR main address to the first address on the indicated interface.
     *
     * \param interface IPv4 interface index
     */
    void SetMainInterface(uint32_t interface);
 
    /**
     * Dump the neighbor table, two-hop neighbor table, and routing table
     * to logging output (NS_LOG_DEBUG log level).  If logging is disabled,
     * this function does nothing.
     */
    void Dump();
 
    /**
     * Get the routing table entries.
     * \return the list of routing table entries discovered by OLSR
     */
    std::vector<RoutingTableEntry> GetRoutingTableEntries() const;
 
    /**
     * Gets the MPR set.
     * \return The MPR set.
     */
    MprSet GetMprSet() const;
 
    /**
     * Gets the MPR selectors.
     * \returns The MPR selectors.
     */
    const MprSelectorSet& GetMprSelectors() const;
 
    /**
     * Get the one hop neighbors.
     * \return the set of neighbors discovered by OLSR
     */
    const NeighborSet& GetNeighbors() const;
 
    /**
     * Get the two hop neighbors.
     * \return the set of two hop neighbors discovered by OLSR
     */
    const TwoHopNeighborSet& GetTwoHopNeighbors() const;
 
    /**
     * Gets the topology set.
     * \returns The topology set discovery by OLSR
     */
    const TopologySet& GetTopologySet() const;
 
    /**
     * Gets the underlying OLSR state object
     * \returns The OLSR state object
     */
    const OlsrState& GetOlsrState() const;
 
    /**
     * Assign a fixed random variable stream number to the random variables
     * used by this model.  Return the number of streams (possibly zero) that
     * have been assigned.
     *
     * \param stream first stream index to use
     * \return the number of stream indices assigned by this model
     */
    int64_t AssignStreams(int64_t stream);
 
    /**
     * TracedCallback signature for Packet transmit and receive events.
     *
     * \param [in] header
     * \param [in] messages
     */
    typedef void (*PacketTxRxTracedCallback)(const PacketHeader& header,
                                             const MessageList& messages);
 
    /**
     * TracedCallback signature for routing table computation.
     *
     * \param [in] size Final routing table size.
     */
    typedef void (*TableChangeTracedCallback)(uint32_t size);
 
  private:
    std::set<uint32_t> m_interfaceExclusions; //!< Set of interfaces excluded by OSLR.
    Ptr<Ipv4StaticRouting>
        m_routingTableAssociation; //!< Associations from an Ipv4StaticRouting instance
 
  public:
    /**
     * Get the excluded interfaces.
     * \returns Container of excluded interfaces.
     */
    std::set<uint32_t> GetInterfaceExclusions() const
    {
        return m_interfaceExclusions;
    }
 
    /**
     * Set the interfaces to be excluded.
     * \param exceptions Container of excluded interfaces.
     */
    void SetInterfaceExclusions(std::set<uint32_t> exceptions);
 
    /**
     *  \brief Injects the specified (networkAddr, netmask) tuple in the list of
     *  local HNA associations to be sent by the node via HNA messages.
     *  If this tuple already exists, nothing is done.
     *
     * \param networkAddr The network address.
     * \param netmask The network mask.
     */
    void AddHostNetworkAssociation(Ipv4Address networkAddr, Ipv4Mask netmask);
 
    /**
     * \brief Removes the specified (networkAddr, netmask) tuple from the list of
     * local HNA associations to be sent by the node via HNA messages.
     * If this tuple does not exist, nothing is done (see "OlsrState::EraseAssociation()").
     *
     * \param networkAddr The network address.
     * \param netmask The network mask.
     */
    void RemoveHostNetworkAssociation(Ipv4Address networkAddr, Ipv4Mask netmask);
 
    /**
     * \brief Associates the specified Ipv4StaticRouting routing table
     *        to the OLSR routing protocol. Entries from this associated
     *        routing table that use non-olsr outgoing interfaces are added
     *        to the list of local HNA associations so that they are included
     *        in HNA messages sent by the node.
     *        If this method is called more than once, entries from the old
     *        association are deleted before entries from the new one are added.
     * \param routingTable the Ipv4StaticRouting routing table to be associated.
     */
    void SetRoutingTableAssociation(Ptr<Ipv4StaticRouting> routingTable);
 
    /**
     * \brief Returns the internal HNA table
     * \returns the internal HNA table
     */
    Ptr<const Ipv4StaticRouting> GetRoutingTableAssociation() const;
 
  protected:
    void DoInitialize() override;
    void DoDispose() override;
 
  private:
    std::map<Ipv4Address, RoutingTableEntry> m_table; //!< Data structure for the routing table.
 
    Ptr<Ipv4StaticRouting> m_hnaRoutingTable; //!< Routing table for HNA routes
 
    EventGarbageCollector m_events; //!< Running events.
 
    uint16_t m_packetSequenceNumber;  //!< Packets sequence number counter.
    uint16_t m_messageSequenceNumber; //!< Messages sequence number counter.
    uint16_t m_ansn;                  //!< Advertised Neighbor Set sequence number.
 
    Time m_helloInterval;      //!< HELLO messages' emission interval.
    Time m_tcInterval;         //!< TC messages' emission interval.
    Time m_midInterval;        //!< MID messages' emission interval.
    Time m_hnaInterval;        //!< HNA messages' emission interval.
    Willingness m_willingness; //!< Willingness for forwarding packets on behalf of other nodes.
 
    OlsrState m_state; //!< Internal state with all needed data structs.
    Ptr<Ipv4> m_ipv4;  //!< IPv4 object the routing is linked to.
 
    /**
     * \brief Clears the routing table and frees the memory assigned to each one of its entries.
     */
    void Clear();
 
    /**
     * Returns the routing table size.
     * \return The routing table size.
     */
    uint32_t GetSize() const
    {
        return m_table.size();
    }
 
    /**
     * \brief Deletes the entry whose destination address is given.
     * \param dest address of the destination node.
     */
    void RemoveEntry(const Ipv4Address& dest);
    /**
     * \brief Adds a new entry into the routing table.
     *
     * If an entry for the given destination existed, it is deleted and freed.
     *
     * \param dest address of the destination node.
     * \param next address of the next hop node.
     * \param interface address of the local interface.
     * \param distance distance to the destination node.
     */
    void AddEntry(const Ipv4Address& dest,
                  const Ipv4Address& next,
                  uint32_t interface,
                  uint32_t distance);
    /**
     * \brief Adds a new entry into the routing table.
     *
     * If an entry for the given destination existed, an error is thrown.
     *
     * \param dest address of the destination node.
     * \param next address of the next hop node.
     * \param interfaceAddress address of the local interface.
     * \param distance distance to the destination node.
     */
    void AddEntry(const Ipv4Address& dest,
                  const Ipv4Address& next,
                  const Ipv4Address& interfaceAddress,
                  uint32_t distance);
 
    /**
     * \brief Looks up an entry for the specified destination address.
     * \param [in] dest Destination address.
     * \param [out] outEntry Holds the routing entry result, if found.
     * \return true if found, false if not found.
     */
    bool Lookup(const Ipv4Address& dest, RoutingTableEntry& outEntry) const;
 
    /**
     * \brief Finds the appropriate entry which must be used in order to forward
     * a data packet to a next hop (given a destination).
     *
     * Imagine a routing table like this: [A,B] [B,C] [C,C]; being each pair of the
     * form [dest addr, next-hop addr]. In this case, if this function is invoked
     * with [A,B] then pair [C,C] is returned because C is the next hop that must be used
     * to forward a data packet destined to A. That is, C is a neighbor of this node,
     * but B isn't. This function finds the appropriate neighbor for forwarding a packet.
     *
     * \param[in] entry The routing table entry which indicates the destination node
     * we are interested in.
     *
     * \param[out] outEntry The appropriate routing table entry which indicates the next
     * hop which must be used for forwarding a data packet, or NULL if there is no such entry.
     *
     * \return True if an entry was found, false otherwise.
     */
    bool FindSendEntry(const RoutingTableEntry& entry, RoutingTableEntry& outEntry) const;
 
  public:
    // From Ipv4RoutingProtocol
    Ptr<Ipv4Route> RouteOutput(Ptr<Packet> p,
                               const Ipv4Header& header,
                               Ptr<NetDevice> oif,
                               Socket::SocketErrno& sockerr) override;
    bool RouteInput(Ptr<const Packet> p,
                    const Ipv4Header& header,
                    Ptr<const NetDevice> idev,
                    const UnicastForwardCallback& ucb,
                    const MulticastForwardCallback& mcb,
                    const LocalDeliverCallback& lcb,
                    const ErrorCallback& ecb) override;
    void SetIpv4(Ptr<Ipv4> ipv4) override;
 
    void PrintRoutingTable(Ptr<OutputStreamWrapper> stream,
                           Time::Unit unit = Time::S) const override;
 
  private:
    void NotifyInterfaceUp(uint32_t interface) override;
    void NotifyInterfaceDown(uint32_t interface) override;
    void NotifyAddAddress(uint32_t interface, Ipv4InterfaceAddress address) override;
    void NotifyRemoveAddress(uint32_t interface, Ipv4InterfaceAddress address) override;
 
    /**
     * Send an OLSR message.
     * \param packet The packet to be sent.
     * \param containedMessages The messages contained in the packet.
     */
    void SendPacket(Ptr<Packet> packet, const MessageList& containedMessages);
 
    /**
     * Increments packet sequence number and returns the new value.
     * \return The packet sequence number.
     */
    inline uint16_t GetPacketSequenceNumber();
 
    /**
     * Increments message sequence number and returns the new value.
     * \return The message sequence number.
     */
    inline uint16_t GetMessageSequenceNumber();
 
    /**
     * Receive an OLSR message.
     * \param socket The receiving socket.
     */
    void RecvOlsr(Ptr<Socket> socket);
 
    /**
     * \brief Computes MPR set of a node following \RFC{3626} hints.
     */
    void MprComputation();
 
    /**
     * \brief Creates the routing table of the node following \RFC{3626} hints.
     */
    void RoutingTableComputation();
 
  public:
    /**
     * \brief Gets the main address associated with a given interface address.
     * \param iface_addr the interface address.
     * \return the corresponding main address.
     */
    Ipv4Address GetMainAddress(Ipv4Address iface_addr) const;
 
  private:
    /**
     * \brief Tests whether or not the specified route uses a non-OLSR outgoing interface.
     * \param route The route to be tested.
     * \returns True if the outgoing interface of the specified route is a non-OLSR interface,
     * false otherwise.
     */
    bool UsesNonOlsrOutgoingInterface(const Ipv4RoutingTableEntry& route);
 
    // Timer handlers
    Timer m_helloTimer; //!< Timer for the HELLO message.
    /**
     * \brief Sends a HELLO message and reschedules the HELLO timer.
     */
    void HelloTimerExpire();
 
    Timer m_tcTimer; //!< Timer for the TC message.
    /**
     * \brief Sends a TC message (if there exists any MPR selector) and reschedules the TC timer.
     */
    void TcTimerExpire();
 
    Timer m_midTimer; //!< Timer for the MID message.
    /**
     * \brief \brief Sends a MID message (if the node has more than one interface) and resets the
     * MID timer.
     */
    void MidTimerExpire();
 
    Timer m_hnaTimer; //!< Timer for the HNA message.
    /**
     * \brief Sends an HNA message (if the node has associated hosts/networks) and reschedules the
     * HNA timer.
     */
    void HnaTimerExpire();
 
    /**
     * \brief Removes tuple if expired. Else timer is rescheduled to expire at tuple.expirationTime.
     *
     * The task of actually removing the tuple is left to the OLSR agent.
     *
     * \param address The address of the tuple.
     * \param sequenceNumber The sequence number of the tuple.
     */
    void DupTupleTimerExpire(Ipv4Address address, uint16_t sequenceNumber);
 
    bool m_linkTupleTimerFirstTime; //!< Flag to indicate if it is the first time the LinkTupleTimer
                                    //!< fires.
    /**
     * \brief Removes tuple_ if expired. Else if symmetric time
     * has expired then it is assumed a neighbor loss and agent_->nb_loss()
     * is called. In this case the timer is rescheduled to expire at
     * tuple_->time(). Otherwise the timer is rescheduled to expire at
     * the minimum between tuple_->time() and tuple_->sym_time().
     *
     * The task of actually removing the tuple is left to the OLSR agent.
     *
     * \param neighborIfaceAddr The tuple neighbor interface address.
     */
    void LinkTupleTimerExpire(Ipv4Address neighborIfaceAddr);
 
    /**
     * \brief Removes 2_hop neighbor tuple_ if expired. Else the timer is rescheduled to expire at
     * tuple_->time().
     *
     * The task of actually removing the tuple is left to the OLSR agent.
     *
     * \param neighborMainAddr The neighbor main address.
     * \param twoHopNeighborAddr The 2-hop neighbor address.
     */
    void Nb2hopTupleTimerExpire(Ipv4Address neighborMainAddr, Ipv4Address twoHopNeighborAddr);
 
    /**
     * \brief Removes MPR selector tuple_ if expired. Else the timer is rescheduled to expire at
     * tuple_->time().
     *
     * The task of actually removing the tuple is left to the OLSR agent.
     *
     * \param mainAddr The tuple IPv4 address.
     */
    void MprSelTupleTimerExpire(Ipv4Address mainAddr);
 
    /**
     * \brief Removes topology tuple_ if expired. Else the timer is rescheduled to expire at
     * tuple_->time().
     *
     * The task of actually removing the tuple is left to the OLSR agent.
     *
     * \param destAddr The destination address.
     * \param lastAddr The last address.
     */
    void TopologyTupleTimerExpire(Ipv4Address destAddr, Ipv4Address lastAddr);
 
    /**
     * \brief Removes interface association tuple_ if expired. Else the timer is rescheduled to
     * expire at tuple_->time().
     *
     * \param ifaceAddr The interface address.
     */
    void IfaceAssocTupleTimerExpire(Ipv4Address ifaceAddr);
 
    /**
     * \brief Removes association tuple_ if expired. Else timer is rescheduled to expire at
     * tuple_->time().
     *
     * \param gatewayAddr The gateway address.
     * \param networkAddr The network address.
     * \param netmask  The network mask.
     */
    void AssociationTupleTimerExpire(Ipv4Address gatewayAddr,
                                     Ipv4Address networkAddr,
                                     Ipv4Mask netmask);
 
    /**
     * Increments the ANSN counter.
     */
    void IncrementAnsn();
 
    /// A list of pending messages which are buffered awaiting for being sent.
    olsr::MessageList m_queuedMessages;
    Timer m_queuedMessagesTimer; //!< timer for throttling outgoing messages
 
    /**
     * \brief OLSR's default forwarding algorithm.
     *
     * See \RFC{3626} for details.
     *
     * \param olsrMessage The %OLSR message which must be forwarded.
     * \param duplicated NULL if the message has never been considered for forwarding, or a
     * duplicate tuple in other case.
     * \param localIface The address of the interface where the message was received from.
     * \param senderAddress The sender IPv4 address.
     */
    void ForwardDefault(olsr::MessageHeader olsrMessage,
                        DuplicateTuple* duplicated,
                        const Ipv4Address& localIface,
                        const Ipv4Address& senderAddress);
 
    /**
     * \brief Enqueues an %OLSR message which will be sent with a delay of (0, delay].
     *
     * This buffering system is used in order to piggyback several %OLSR messages in
     * a same %OLSR packet.
     *
     * \param message the %OLSR message which must be sent.
     * \param delay maximum delay the %OLSR message is going to be buffered.
     */
    void QueueMessage(const olsr::MessageHeader& message, Time delay);
 
    /**
     * \brief Creates as many %OLSR packets as needed in order to send all buffered
     * %OLSR messages.
     *
     * Maximum number of messages which can be contained in an %OLSR packet is
     * dictated by OLSR_MAX_MSGS constant.
     */
    void SendQueuedMessages();
 
    /**
     * \brief Creates a new %OLSR HELLO message which is buffered for being sent later on.
     */
    void SendHello();
 
    /**
     * \brief Creates a new %OLSR TC message which is buffered for being sent later on.
     */
    void SendTc();
 
    /**
     * \brief Creates a new %OLSR MID message which is buffered for being sent later on.
     */
    void SendMid();
 
    /**
     * \brief Creates a new %OLSR HNA message which is buffered for being sent later on.
     */
    void SendHna();
 
    /**
     * \brief Performs all actions needed when a neighbor loss occurs.
     *
     * Neighbor Set, 2-hop Neighbor Set, MPR Set and MPR Selector Set are updated.
     *
     * \param tuple link tuple with the information of the link to the neighbor which has been lost.
     */
    void NeighborLoss(const LinkTuple& tuple);
 
    /**
     * \brief Adds a duplicate tuple to the Duplicate Set.
     *
     * \param tuple The duplicate tuple to be added.
     */
    void AddDuplicateTuple(const DuplicateTuple& tuple);
 
    /**
     * \brief Removes a duplicate tuple from the Duplicate Set.
     *
     * \param tuple The duplicate tuple to be removed.
     */
    void RemoveDuplicateTuple(const DuplicateTuple& tuple);
 
    /**
     * Adds a link tuple.
     * \param tuple The tuple to be added.
     * \param willingness The tuple willingness.
     */
    void LinkTupleAdded(const LinkTuple& tuple, Willingness willingness);
 
    /**
     * \brief Removes a link tuple from the Link Set.
     *
     * \param tuple The link tuple to be removed.
     */
    void RemoveLinkTuple(const LinkTuple& tuple);
 
    /**
     * \brief This function is invoked when a link tuple is updated. Its aim is to
     * also update the corresponding neighbor tuple if it is needed.
     *
     * \param tuple The link tuple which has been updated.
     * \param willingness The tuple willingness.
     */
    void LinkTupleUpdated(const LinkTuple& tuple, Willingness willingness);
 
    /**
     * \brief Adds a neighbor tuple to the Neighbor Set.
     *
     * \param tuple The neighbor tuple to be added.
     */
    void AddNeighborTuple(const NeighborTuple& tuple);
 
    /**
     * \brief Removes a neighbor tuple from the Neighbor Set.
     *
     * \param tuple The neighbor tuple to be removed.
     */
    void RemoveNeighborTuple(const NeighborTuple& tuple);
 
    /**
     * \brief Adds a 2-hop neighbor tuple to the 2-hop Neighbor Set.
     *
     * \param tuple The 2-hop neighbor tuple to be added.
     */
    void AddTwoHopNeighborTuple(const TwoHopNeighborTuple& tuple);
 
    /**
     * \brief Removes a 2-hop neighbor tuple from the 2-hop Neighbor Set.
     *
     * \param tuple The 2-hop neighbor tuple to be removed.
     */
    void RemoveTwoHopNeighborTuple(const TwoHopNeighborTuple& tuple);
 
    /**
     * \brief Adds an MPR selector tuple to the MPR Selector Set.
     * Advertised Neighbor Sequence Number (ANSN) is also updated.
     *
     * \param tuple The MPR selector tuple to be added.
     */
    void AddMprSelectorTuple(const MprSelectorTuple& tuple);
 
    /**
     * \brief Removes an MPR selector tuple from the MPR Selector Set.
     * Advertised Neighbor Sequence Number (ANSN) is also updated.
     *
     * \param tuple The MPR selector tuple to be removed.
     */
    void RemoveMprSelectorTuple(const MprSelectorTuple& tuple);
 
    /**
     * \brief Adds a topology tuple to the Topology Set.
     *
     * \param tuple The topology tuple to be added.
     */
    void AddTopologyTuple(const TopologyTuple& tuple);
 
    /**
     * \brief Removes a topology tuple to the Topology Set.
     *
     * \param tuple The topology tuple to be removed.
     */
    void RemoveTopologyTuple(const TopologyTuple& tuple);
 
    /**
     * \brief Adds an interface association tuple to the Interface Association Set.
     *
     * \param tuple The interface association tuple to be added.
     */
    void AddIfaceAssocTuple(const IfaceAssocTuple& tuple);
 
    /**
     * \brief Removed an interface association tuple to the Interface Association Set.
     *
     * \param tuple The interface association tuple to be removed.
     */
    void RemoveIfaceAssocTuple(const IfaceAssocTuple& tuple);
 
    /**
     * \brief Adds a host network association tuple to the Association Set.
     *
     * \param tuple The host network association tuple to be added.
     */
    void AddAssociationTuple(const AssociationTuple& tuple);
 
    /**
     * \brief Removes a host network association tuple to the Association Set.
     *
     * \param tuple The host network association tuple to be removed.
     */
    void RemoveAssociationTuple(const AssociationTuple& tuple);
 
    /**
     * \brief Processes a HELLO message following \RFC{3626} specification.
     *
     * Link sensing and population of the Neighbor Set, 2-hop Neighbor Set and MPR
     * Selector Set are performed.
     *
     * \param msg the %OLSR message which contains the HELLO message.
     * \param receiverIface the address of the interface where the message was received from.
     * \param senderIface the address of the interface where the message was sent from.
     */
    void ProcessHello(const olsr::MessageHeader& msg,
                      const Ipv4Address& receiverIface,
                      const Ipv4Address& senderIface);
 
    /**
     * \brief Processes a TC message following \RFC{3626} specification.
     *
     * The Topology Set is updated (if needed) with the information of
     * the received TC message.
     *
     * \param msg The %OLSR message which contains the TC message.
     * \param senderIface The address of the interface where the message was sent from.
     *
     */
    void ProcessTc(const olsr::MessageHeader& msg, const Ipv4Address& senderIface);
 
    /**
     * \brief Processes a MID message following \RFC{3626} specification.
     *
     * The Interface Association Set is updated (if needed) with the information
     * of the received MID message.
     *
     * \param msg the %OLSR message which contains the MID message.
     * \param senderIface the address of the interface where the message was sent from.
     */
    void ProcessMid(const olsr::MessageHeader& msg, const Ipv4Address& senderIface);
 
    /**
     *
     * \brief Processes a HNA message following \RFC{3626} specification.
     *
     * The Host Network Association Set is updated (if needed) with the information
     * of the received HNA message.
     *
     * \param msg the %OLSR message which contains the HNA message.
     * \param senderIface the address of the interface where the message was sent from.
     *
     */
    void ProcessHna(const olsr::MessageHeader& msg, const Ipv4Address& senderIface);
 
    /**
     * \brief Updates Link Set according to a new received HELLO message
     * (following \RFC{3626} specification). Neighbor Set is also updated if needed.
     * \param msg The received message.
     * \param hello The received HELLO sub-message.
     * \param receiverIface The interface that received the message.
     * \param senderIface The sender interface.
     */
    void LinkSensing(const olsr::MessageHeader& msg,
                     const olsr::MessageHeader::Hello& hello,
                     const Ipv4Address& receiverIface,
                     const Ipv4Address& senderIface);
 
    /**
     * \brief Updates the Neighbor Set according to the information contained in
     * a new received HELLO message (following \RFC{3626}).
     * \param msg The received message.
     * \param hello The received HELLO sub-message.
     */
    void PopulateNeighborSet(const olsr::MessageHeader& msg,
                             const olsr::MessageHeader::Hello& hello);
 
    /**
     * \brief Updates the 2-hop Neighbor Set according to the information contained
     * in a new received HELLO message (following \RFC{3626}).
     * \param msg The received message.
     * \param hello The received HELLO sub-message.
     */
    void PopulateTwoHopNeighborSet(const olsr::MessageHeader& msg,
                                   const olsr::MessageHeader::Hello& hello);
 
    /**
     * \brief Updates the MPR Selector Set according to the information contained in
     * a new received HELLO message (following \RFC{3626}).
     * \param msg The received message.
     * \param hello The received HELLO sub-message.
     */
    void PopulateMprSelectorSet(const olsr::MessageHeader& msg,
                                const olsr::MessageHeader::Hello& hello);
 
    int Degree(const NeighborTuple& tuple);
 
    /**
     * Check that address is one of my interfaces.
     * \param a the address to check.
     * \return true if the address is own by the node.
     */
    bool IsMyOwnAddress(const Ipv4Address& a) const;
 
    Ipv4Address m_mainAddress; //!< the node main address.
 
    // One socket per interface, each bound to that interface's address
    // (reason: for OLSR Link Sensing we need to know on which interface
    // HELLO messages arrive)
    std::map<Ptr<Socket>, Ipv4InterfaceAddress>
        m_sendSockets;        //!< Container of sockets and the interfaces they are opened onto.
    Ptr<Socket> m_recvSocket; //!< Receiving socket.
 
    /// Rx packet trace.
    TracedCallback<const PacketHeader&, const MessageList&> m_rxPacketTrace;
 
    /// Tx packet trace.
    TracedCallback<const PacketHeader&, const MessageList&> m_txPacketTrace;
 
    /// Routing table changes callback
    TracedCallback<uint32_t> m_routingTableChanged;
 
    /// Provides uniform random variables.
    Ptr<UniformRandomVariable> m_uniformRandomVariable;
};
 
} // namespace olsr
} // namespace ns3
 
#endif /* OLSR_AGENT_IMPL_H */