#ifndef ICMPV4_L4_PROTOCOL_H

#define ICMPV4_L4_PROTOCOL_H

#include "ip-l4-protocol.h"

#include "icmpv4.h"

#include "ns3/ipv4-address.h"

namespace ns3 {

class Node;

class Ipv4Interface;

class Ipv4Route;

class Icmpv4L4Protocol : public IpL4Protocol

{

public:

  static TypeId GetTypeId (void);

  static const uint8_t PROT_NUMBER;

  Icmpv4L4Protocol ();

  virtual ~Icmpv4L4Protocol ();

  void SetNode (Ptr<Node> node);

  static uint16_t GetStaticProtocolNumber (void);

  virtual int GetProtocolNumber (void) const;

  virtual enum IpL4Protocol::RxStatus Receive (Ptr<Packet> p,

  virtual enum IpL4Protocol::RxStatus Receive (Ptr<Packet> p,

  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);

  // From IpL4Protocol

  virtual void SetDownTarget (IpL4Protocol::DownTargetCallback cb);

  virtual void SetDownTarget6 (IpL4Protocol::DownTargetCallback6 cb);

  // From IpL4Protocol

  virtual IpL4Protocol::DownTargetCallback GetDownTarget (void) const;

  virtual IpL4Protocol::DownTargetCallback6 GetDownTarget6 (void) const;

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;

  IpL4Protocol::DownTargetCallback m_downTarget;

};

} // namespace ns3

#endif /* ICMPV4_L4_PROTOCOL_H */