net: move network-related files to src/net

Some namespaces are changed:

* ndn::util::FaceUri is now ndn::FaceUri
* ndn::util::ethernet is now ndn::ethernet
* ndn::util::NetworkMonitor and related classes are now in ndn::net

refs #3940

Change-Id: Ia4754caef9726efc73f5a303cec46fc95c744d70
diff --git a/src/net/detail/network-monitor-impl-rtnl.hpp b/src/net/detail/network-monitor-impl-rtnl.hpp
new file mode 100644
index 0000000..d43abce
--- /dev/null
+++ b/src/net/detail/network-monitor-impl-rtnl.hpp
@@ -0,0 +1,126 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2013-2017 Regents of the University of California.
+ *
+ * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
+ *
+ * ndn-cxx library is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * ndn-cxx library 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 Lesser General Public License for more details.
+ *
+ * You should have received copies of the GNU General Public License and GNU Lesser
+ * General Public License along with ndn-cxx, e.g., in COPYING.md file.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
+ *
+ * @author Davide Pesavento <davide.pesavento@lip6.fr>
+ */
+
+#ifndef NDN_NET_NETWORK_MONITOR_IMPL_RTNL_HPP
+#define NDN_NET_NETWORK_MONITOR_IMPL_RTNL_HPP
+
+#include "ndn-cxx-config.hpp"
+#include "../network-monitor.hpp"
+
+#ifndef NDN_CXX_HAVE_RTNETLINK
+#error "This file should not be compiled ..."
+#endif
+
+#include <boost/asio/posix/stream_descriptor.hpp>
+
+#include <array>
+#include <map>
+
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+#include <linux/if_addr.h>
+#include <linux/if_link.h>
+
+namespace ndn {
+namespace net {
+
+class NetworkMonitor::Impl
+{
+public:
+  /** \brief initialize netlink socket and start enumerating interfaces
+   */
+  Impl(NetworkMonitor& nm, boost::asio::io_service& io);
+
+  ~Impl();
+
+  uint32_t
+  getCapabilities() const
+  {
+    return NetworkMonitor::CAP_ENUM |
+           NetworkMonitor::CAP_IF_ADD_REMOVE |
+           NetworkMonitor::CAP_STATE_CHANGE |
+           NetworkMonitor::CAP_MTU_CHANGE |
+           NetworkMonitor::CAP_ADDR_ADD_REMOVE;
+  }
+
+  shared_ptr<NetworkInterface>
+  getNetworkInterface(const std::string& ifname) const;
+
+  std::vector<shared_ptr<NetworkInterface>>
+  listNetworkInterfaces() const;
+
+private:
+  struct RtnlRequest
+  {
+    nlmsghdr nlh;
+    ifinfomsg ifi;
+    rtattr rta __attribute__((aligned(NLMSG_ALIGNTO))); // rtattr has to be aligned
+    uint32_t rtext;                                     // space for IFLA_EXT_MASK
+  };
+
+  bool
+  isEnumerating() const;
+
+  void
+  initSocket();
+
+  void
+  sendDumpRequest(uint16_t nlmsgType);
+
+  void
+  asyncRead();
+
+  void
+  handleRead(const boost::system::error_code& error, size_t nBytesReceived,
+             const shared_ptr<boost::asio::posix::stream_descriptor>& socket);
+
+  void
+  parseNetlinkMessage(const nlmsghdr* nlh, size_t len);
+
+  void
+  parseLinkMessage(const nlmsghdr* nlh, const ifinfomsg* ifi);
+
+  void
+  parseAddressMessage(const nlmsghdr* nlh, const ifaddrmsg* ifa);
+
+  void
+  parseRouteMessage(const nlmsghdr* nlh, const rtmsg* rtm);
+
+  static void
+  updateInterfaceState(NetworkInterface& interface, uint8_t operState);
+
+private:
+  NetworkMonitor& m_nm;
+  std::map<int /*ifindex*/, shared_ptr<NetworkInterface>> m_interfaces; ///< interface map
+  std::array<uint8_t, 16384> m_buffer; ///< holds netlink messages received from the kernel
+  shared_ptr<boost::asio::posix::stream_descriptor> m_socket; ///< the netlink socket
+  uint32_t m_pid; ///< our port ID (unicast address for netlink sockets)
+  uint32_t m_sequenceNo; ///< sequence number of the last netlink request sent to the kernel
+  bool m_isEnumeratingLinks; ///< true if a dump of all links is in progress
+  bool m_isEnumeratingAddresses; ///< true if a dump of all addresses is in progress
+};
+
+} // namespace net
+} // namespace ndn
+
+#endif // NDN_NET_NETWORK_MONITOR_IMPL_RTNL_HPP