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+//
+// Copyright (C) 2015 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#ifndef UPDATE_ENGINE_CROS_CONNECTION_MANAGER_INTERFACE_H_
+#define UPDATE_ENGINE_CROS_CONNECTION_MANAGER_INTERFACE_H_
+
+#include <memory>
+
+#include <base/macros.h>
+
+#include "update_engine/common/connection_utils.h"
+
+namespace chromeos_update_engine {
+
+// This class exposes a generic interface to the connection manager
+// (e.g FlimFlam, Shill, etc.) to consolidate all connection-related
+// logic in update_engine.
+class ConnectionManagerInterface {
+ public:
+  virtual ~ConnectionManagerInterface() = default;
+
+  // Populates |out_type| with the type of the network connection
+  // that we are currently connected and |out_tethering| with the estimate of
+  // whether that network is being tethered.
+  virtual bool GetConnectionProperties(ConnectionType* out_type,
+                                       ConnectionTethering* out_tethering) = 0;
+
+  // Returns true if we're allowed to update the system when we're
+  // connected to the internet through the given network connection type and the
+  // given tethering state.
+  virtual bool IsUpdateAllowedOver(ConnectionType type,
+                                   ConnectionTethering tethering) const = 0;
+
+  // Returns true if the allowed connection types for update is set in the
+  // device policy. Otherwise, returns false.
+  virtual bool IsAllowedConnectionTypesForUpdateSet() const = 0;
+
+ protected:
+  ConnectionManagerInterface() = default;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ConnectionManagerInterface);
+};
+
+namespace connection_manager {
+// Factory function which creates a ConnectionManager.
+std::unique_ptr<ConnectionManagerInterface> CreateConnectionManager();
+}  // namespace connection_manager
+
+}  // namespace chromeos_update_engine
+
+#endif  // UPDATE_ENGINE_CROS_CONNECTION_MANAGER_INTERFACE_H_