ethernet-face.hpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
#ifndef NFD_DAEMON_FACE_ETHERNET_FACE_HPP
#define NFD_DAEMON_FACE_ETHERNET_FACE_HPP

#include "common.hpp"
#include "face.hpp"
#include "ndnlp-partial-message-store.hpp"
#include "ndnlp-slicer.hpp"
#include "core/network-interface.hpp"

#include <unordered_map>

#ifndef HAVE_LIBPCAP
#error "Cannot include this file when libpcap is not available"
#endif

// forward declarations
struct pcap;
typedef pcap pcap_t;
struct pcap_pkthdr;

namespace nfd {

class EthernetFace : public Face
{
public:
  struct Error : public Face::Error
  {
    Error(const std::string& what) : Face::Error(what) {}
  };

  EthernetFace(boost::asio::posix::stream_descriptor socket,
               const NetworkInterfaceInfo& interface,
               const ethernet::Address& address);

  void
  sendInterest(const Interest& interest) DECL_OVERRIDE;

  void
  sendData(const Data& data) DECL_OVERRIDE;

  void
  close() DECL_OVERRIDE;

private:
  void
  pcapInit();

  void
  setPacketFilter(const char* filterString);

  bool
  joinMulticastGroup();

  void
  sendPacket(const ndn::Block& block);

  void
  handleRead(const boost::system::error_code& error, size_t nBytesRead);

PUBLIC_WITH_TESTS_ELSE_PRIVATE:
  void
  processIncomingPacket(const pcap_pkthdr* header, const uint8_t* packet);

private:
  void
  processErrorCode(const boost::system::error_code& error);

  size_t
  getInterfaceMtu();

private:
  struct Reassembler
  {
    unique_ptr<ndnlp::PartialMessageStore> pms;
    scheduler::EventId expireEvent;
  };

  unique_ptr<pcap_t, void(*)(pcap_t*)> m_pcap;
  boost::asio::posix::stream_descriptor m_socket;

#if defined(__linux__)
  int m_interfaceIndex;
#endif
  std::string m_interfaceName;
  ethernet::Address m_srcAddress;
  ethernet::Address m_destAddress;

  size_t m_interfaceMtu;
  unique_ptr<ndnlp::Slicer> m_slicer;
  std::unordered_map<ethernet::Address, Reassembler> m_reassemblers;
  static const time::nanoseconds REASSEMBLER_LIFETIME;

#ifdef _DEBUG
  unsigned int m_nDropped;
#endif
};

} // namespace nfd

#endif // NFD_DAEMON_FACE_ETHERNET_FACE_HPP