diff --git a/daemon/fw/retx-suppression.hpp b/daemon/fw/retx-suppression.hpp
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+++ b/daemon/fw/retx-suppression.hpp
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+/* -*- 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_FW_RETX_SUPPRESSION_HPP
+#define NFD_DAEMON_FW_RETX_SUPPRESSION_HPP
+
+#include "strategy.hpp"
+
+namespace nfd {
+namespace fw {
+
+/** \brief helper for consumer retransmission suppression
+ */
+class RetxSuppression : noncopyable
+{
+public:
+  enum Result {
+    /** \brief Interest is new (not a retransmission)
+     */
+    NEW,
+
+    /** \brief Interest is retransmission and should be forwarded
+     */
+    FORWARD,
+
+    /** \brief Interest is retransmission and should be suppressed
+     */
+    SUPPRESS
+  };
+
+  /** \brief determines whether Interest is a retransmission,
+   *         and if so, whether it shall be forwarded or suppressed
+   */
+  virtual Result
+  decide(const Face& inFace, const Interest& interest, const pit::Entry& pitEntry) const = 0;
+};
+
+} // namespace fw
+} // namespace nfd
+
+#endif // NFD_DAEMON_FW_RETX_SUPPRESSION_HPP