face: EthernetTransport
This commit replaces NDNLPv1 fragmentation and reassembly
with NDNLPv2 fragmentation and reassembly.
Change-Id: I10751157fcced94d441167ce470aaed79c12bb54
Refs: #3170
diff --git a/daemon/face/ethernet-transport.hpp b/daemon/face/ethernet-transport.hpp
new file mode 100644
index 0000000..1d41008
--- /dev/null
+++ b/daemon/face/ethernet-transport.hpp
@@ -0,0 +1,155 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2014-2015, Regents of the University of California,
+ * Arizona Board of Regents,
+ * Colorado State University,
+ * University Pierre & Marie Curie, Sorbonne University,
+ * Washington University in St. Louis,
+ * Beijing Institute of Technology,
+ * The University of Memphis.
+ *
+ * This file is part of NFD (Named Data Networking Forwarding Daemon).
+ * See AUTHORS.md for complete list of NFD authors and contributors.
+ *
+ * NFD is free software: you can redistribute it and/or modify it under the terms
+ * of the GNU General Public License as published by the Free Software Foundation,
+ * either version 3 of the License, or (at your option) any later version.
+ *
+ * NFD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+ * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ * PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * NFD, e.g., in COPYING.md file. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef NFD_DAEMON_FACE_ETHERNET_TRANSPORT_HPP
+#define NFD_DAEMON_FACE_ETHERNET_TRANSPORT_HPP
+
+#include "common.hpp"
+#include "transport.hpp"
+#include "core/network-interface.hpp"
+
+#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 {
+namespace face {
+
+/**
+ * \brief A multicast Transport that uses raw Ethernet II frames
+ */
+class EthernetTransport DECL_CLASS_FINAL : public Transport
+{
+public:
+ class Error : public std::runtime_error
+ {
+ public:
+ explicit
+ Error(const std::string& what)
+ : std::runtime_error(what)
+ {
+ }
+ };
+
+ /**
+ * @brief Creates an Ethernet-based transport for multicast communication
+ */
+ EthernetTransport(const NetworkInterfaceInfo& interface,
+ const ethernet::Address& mcastAddress);
+
+protected:
+ virtual void
+ beforeChangePersistency(ndn::nfd::FacePersistency newPersistency) DECL_FINAL;
+
+ virtual void
+ doClose() DECL_FINAL;
+
+private:
+ virtual void
+ doSend(Transport::Packet&& packet) DECL_FINAL;
+
+ /**
+ * @brief Allocates and initializes a libpcap context for live capture
+ */
+ void
+ pcapInit();
+
+ /**
+ * @brief Installs a BPF filter on the receiving socket
+ *
+ * @param filterString string containing the source BPF program
+ */
+ void
+ setPacketFilter(const char* filterString);
+
+ /**
+ * @brief Enables receiving frames addressed to our MAC multicast group
+ *
+ * @return true if successful, false otherwise
+ */
+ bool
+ joinMulticastGroup();
+
+ /**
+ * @brief Sends the specified TLV block on the network wrapped in an Ethernet frame
+ */
+ void
+ sendPacket(const ndn::Block& block);
+
+ /**
+ * @brief Receive callback
+ */
+ void
+ handleRead(const boost::system::error_code& error, size_t nBytesRead);
+
+PUBLIC_WITH_TESTS_ELSE_PRIVATE:
+ /**
+ * @brief Processes an incoming frame as captured by libpcap
+ *
+ * @param header pointer to capture metadata
+ * @param packet pointer to the received frame, including the link-layer header
+ */
+ void
+ processIncomingPacket(const pcap_pkthdr* header, const uint8_t* packet);
+
+private:
+ /**
+ * @brief Handles errors encountered by Boost.Asio on the receive path
+ */
+ void
+ processErrorCode(const boost::system::error_code& error);
+
+ /**
+ * @brief Returns the MTU of the underlying network interface
+ */
+ size_t
+ getInterfaceMtu();
+
+private:
+ unique_ptr<pcap_t, void(*)(pcap_t*)> m_pcap;
+ boost::asio::posix::stream_descriptor m_socket;
+
+ ethernet::Address m_srcAddress;
+ ethernet::Address m_destAddress;
+ std::string m_interfaceName;
+#if defined(__linux__)
+ int m_interfaceIndex;
+#endif
+
+#ifdef _DEBUG
+ /// number of packets dropped by the kernel, as reported by libpcap
+ unsigned int m_nDropped;
+#endif
+};
+
+} // namespace face
+} // namespace nfd
+
+#endif // NFD_DAEMON_FACE_ETHERNET_TRANSPORT_HPP