#ifndef ICMPV4_L4_PROTOCOL_H

#define ICMPV4_L4_PROTOCOL_H

#include "ipv4-l4-protocol.h"

#include "icmpv4.h"

#include "ns3/ipv4-address.h"

namespace ns3 {

class Node;

class Ipv4Interface;

class Ipv4Route;

class Icmpv4L4Protocol : public Ipv4L4Protocol

{

public:

  static TypeId GetTypeId (void);

  Icmpv4L4Protocol ();

  virtual ~Icmpv4L4Protocol ();

  void SetNode (Ptr<Node> node);

  static uint16_t GetStaticProtocolNumber (void);

  virtual int GetProtocolNumber (void) const;

  virtual enum Ipv4L4Protocol::RxStatus Receive(Ptr<Packet> p, 

						const Ipv4Address &source,

						const Ipv4Address &destination,

						Ptr<Ipv4Interface> incomingInterface);

  void SendDestUnreachFragNeeded (Ipv4Header header, Ptr<const Packet> orgData, uint16_t nextHopMtu);

  void SendTimeExceededTtl (Ipv4Header header, Ptr<const Packet> orgData);

  void SendDestUnreachPort (Ipv4Header header, Ptr<const Packet> orgData);

protected:

  /*

   * This function will notify other components connected to the node that a new stack member is now connected

   * This will be used to notify Layer 3 protocol of layer 4 protocol stack to connect them together.

   */

  virtual void NotifyNewAggregate ();

private:

  void HandleEcho (Ptr<Packet> p,

		   Icmpv4Header header, 

		   Ipv4Address source,

		   Ipv4Address destination);

  void HandleDestUnreach (Ptr<Packet> p,

			  Icmpv4Header header, 

			  Ipv4Address source,

			  Ipv4Address destination);

  void HandleTimeExceeded (Ptr<Packet> p,

			   Icmpv4Header icmp, 

			   Ipv4Address source,

			   Ipv4Address destination);

  void SendDestUnreach (Ipv4Header header, Ptr<const Packet> orgData, 

			uint8_t code, uint16_t nextHopMtu);

  void SendMessage (Ptr<Packet> packet, Ipv4Address dest, uint8_t type, uint8_t code);

  void SendMessage (Ptr<Packet> packet, Ipv4Address source, Ipv4Address dest, uint8_t type, uint8_t code, Ptr<Ipv4Route> route);

  void Forward (Ipv4Address source, Icmpv4Header icmp,

		uint32_t info, Ipv4Header ipHeader,

		const uint8_t payload[8]);

  virtual void DoDispose (void);

  Ptr<Node> m_node;

};

} // namespace ns3

#endif /* ICMPV4_L4_PROTOCOL_H */