utils: LocalInfoTag to track face information
diff --git a/utils/ndn-local-info-tag.h b/utils/ndn-local-info-tag.h
new file mode 100644
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+++ b/utils/ndn-local-info-tag.h
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+/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2013 University of California, Los Angeles
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Author: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ */
+
+#ifndef NDN_LOCAL_INFO_TAG_H
+#define NDN_LOCAL_INFO_TAG_H
+
+#include "ns3/tag.h"
+#include "ns3/ptr.h"
+
+namespace ns3 {
+namespace ndn {
+
+class Face;
+
+/**
+ * @brief Packet tag that is used to keep information about face from which packet was received
+ *
+ * This tag may be extended later to include more information, if necessary
+ */
+class LocalInfoTag : public Tag
+{
+public:
+ static TypeId
+ GetTypeId ();
+
+ /**
+ * @brief Constructor
+ */
+ LocalInfoTag (Ptr<Face> inFace);
+
+ /**
+ * @brief Destructor
+ */
+ ~LocalInfoTag ();
+
+ /**
+ * @brief Get smart pointer to the face
+ *
+ * @returns 0 or a valid smart pointer to a face
+ */
+ uint32_t
+ Get () const
+ {
+ return m_faceId;
+ }
+
+ ////////////////////////////////////////////////////////
+ // from ObjectBase
+ ////////////////////////////////////////////////////////
+ virtual TypeId
+ GetInstanceTypeId () const;
+
+ ////////////////////////////////////////////////////////
+ // from Tag
+ ////////////////////////////////////////////////////////
+
+ virtual uint32_t
+ GetSerializedSize () const;
+
+ virtual void
+ Serialize (TagBuffer i) const;
+
+ virtual void
+ Deserialize (TagBuffer i);
+
+ virtual void
+ Print (std::ostream &os) const;
+
+public:
+ static const uint32_t CACHE_FACE = static_cast<uint32_t> (-1);
+
+private:
+ uint32_t m_faceId;
+};
+
+} // namespace ndn
+} // namespace ns3
+
+#endif // NDN_LOCAL_INFO_TAG_H