udpipencaps.hh

COPE the first practical network coding scheme which is developped on click

#ifndef CLICK_UDPIPENCAPS_HH
#define CLICK_UDPIPENCAPS_HH
#include <click/element.hh>
#include <click/glue.hh>
#include <click/atomic.hh>
#include <clicknet/udp.h>
CLICK_DECLS

/*
 * =c
 * UDPIPEncap(SADDR, SPORT, DADDR, DPORT [, CHECKSUM?])
 * =s encapsulation, UDP
 * encapsulates packets in static UDP/IP headers
 * =d
 * Encapsulates each incoming packet in a UDP/IP packet with source address
 * SADDR, source port SPORT, destination address DADDR, and destination port
 * DPORT. The UDP checksum is calculated if CHECKSUM? is true; it is true by
 * default.
 *
 * The UDPIPEncap element adds both a UDP header and an IP header.
 *
 * The Strip element can be used by the receiver to get rid of the
 * encapsulation header.
 * =e
 *   UDPIPEncap(1.0.0.1, 1234, 2.0.0.2, 1234)
 * =a Strip, IPEncap
 */

class UDPFlow { public:
  IPAddress _src;
  IPAddress _dst;
  unsigned _sport;
  unsigned _dport;
};

class UDPIPEncaps : public Element { public:

  UDPIPEncaps();
  ~UDPIPEncaps();
  
  const char *class_name() const	{ return "UDPIPEncaps"; }
  const char *processing() const	{ return AGNOSTIC; }
  
  int configure(Vector<String> &, ErrorHandler *);
  bool can_live_reconfigure() const     { return true; }
  void add_handlers();
  static int add_flow(const String &arg, Element *e, void *, ErrorHandler *errh);

  Packet *simple_action(Packet *);

  typedef Vector<UDPFlow*> Flows;
  Flows _flows;
  int _nflows;
  int _flowidx;
 
 private:
  bool _cksum : 1;
#if HAVE_FAST_CHECKSUM && FAST_CHECKSUM_ALIGNED
  bool _aligned : 1;
#endif
  atomic_uint32_t _id;

};

CLICK_ENDDECLS
#endif