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/network-address.hpp b/src/net/network-address.hpp
new file mode 100644
index 0000000..632a30f
--- /dev/null
+++ b/src/net/network-address.hpp
@@ -0,0 +1,130 @@
+/* -*- 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_ADDRESS_HPP
+#define NDN_NET_NETWORK_ADDRESS_HPP
+
+#include "network-monitor.hpp"
+
+#include <boost/asio/ip/address.hpp>
+
+namespace ndn {
+namespace net {
+
+enum class AddressFamily {
+  UNSPECIFIED,
+  V4,
+  V6,
+};
+
+enum class AddressScope {
+  NOWHERE,
+  HOST,
+  LINK,
+  GLOBAL,
+};
+
+std::ostream&
+operator<<(std::ostream& os, AddressScope scope);
+
+/**
+ * @brief Stores one IP address supported by a network interface.
+ */
+class NetworkAddress
+{
+public: // getters
+  /** @brief Returns the address family
+   */
+  AddressFamily
+  getFamily() const
+  {
+    return m_family;
+  }
+
+  /** @brief Returns the IP address (v4 or v6)
+   */
+  boost::asio::ip::address
+  getIp() const
+  {
+    return m_ip;
+  }
+
+  /** @brief Returns the IP broadcast address
+   */
+  boost::asio::ip::address
+  getBroadcast() const
+  {
+    return m_broadcast;
+  }
+
+  /** @brief Returns a bitset of platform-specific flags enabled on the address
+   */
+  uint32_t
+  getFlags() const
+  {
+    return m_flags;
+  }
+
+  /** @brief Returns the address scope
+   */
+  AddressScope
+  getScope() const
+  {
+    return m_scope;
+  }
+
+  /** @brief Returns the prefix length
+   */
+  uint8_t
+  getPrefixLength() const
+  {
+    return m_prefixLength;
+  }
+
+  friend bool
+  operator<(const NetworkAddress& a, const NetworkAddress& b)
+  {
+    return a.m_ip < b.m_ip;
+  }
+
+private: // constructor
+  NetworkAddress();
+
+private:
+  friend class NetworkMonitor::Impl;
+
+  AddressFamily m_family;
+  boost::asio::ip::address m_ip;
+  boost::asio::ip::address m_broadcast;
+  uint32_t m_flags; // IFA_F_* in if_addr.h
+  AddressScope m_scope;
+  uint8_t m_prefixLength;
+};
+
+std::ostream&
+operator<<(std::ostream& os, const NetworkAddress& address);
+
+} // namespace net
+} // namespace ndn
+
+#endif // NDN_NET_NETWORK_ADDRESS_HPP