#ifndef ns_or_h#define ns_or_h#include "agent.h"#include "tclcl.h"#include "packet.h"#include "address.h"#include "ip.h"struct hdr_or {		int nexthop;	double send_time; 	double rcv_time;	// when or arrived to receiver 	int seq;		// sequence number 	struct hdr_or* next;	// Header access methods	static int offset_; // required by PacketHeaderManager	inline static int& offset() { return offset_; }	inline static hdr_or* access(const Packet* p) {		return (hdr_or*) p->access(offset_);	}};class OrAgent : public Agent {public:	OrAgent();	int seq; 	int size_of_packet(Packet* p);	virtual int command(int argc, const char*const* argv);	virtual void recv(Packet*, Handler*);};#endif // ns_or_h