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diff --git a/src/vnet/lisp-gpe/lisp_gpe_tunnel.h b/src/vnet/lisp-gpe/lisp_gpe_tunnel.h
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+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ * 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.
+ */
+/**
+ * @file
+ * @brief Common utility functions for IPv4, IPv6 and L2 LISP-GPE tunnels.
+ *
+ */
+
+#ifndef LISP_GPE_TUNNEL_H__
+#define LISP_GPE_TUNNEL_H__
+
+#include <vnet/lisp-gpe/lisp_gpe.h>
+#include <vnet/lisp-gpe/lisp_gpe_packet.h>
+
+/**
+ * Forward declaration
+ */
+struct lisp_gpe_adjacency_t_;
+
+/**
+ * A Key for a tunnel
+ */
+typedef struct lisp_gpe_tunnel_key_t_
+{
+  ip_address_t rmt;
+  ip_address_t lcl;
+  u32 fib_index;
+} lisp_gpe_tunnel_key_t;
+
+/**
+ * @brief A LISP GPE Tunnel.
+ *
+ * A tunnel represents an associatation between a local and remote RLOC.
+ * As such it represents a unique LISP rewrite.
+ */
+typedef struct lisp_gpe_tunnel_t_
+{
+  /**
+   * RLOC pair and rloc fib_index. This is the tunnel's key.
+   */
+  lisp_gpe_tunnel_key_t *key;
+
+  /**
+   * number of reference counting locks
+   */
+  u32 locks;
+
+  /**
+   * the FIB entry through which the remote rloc is reachable
+   s */
+  fib_node_index_t fib_entry_index;
+} lisp_gpe_tunnel_t;
+
+extern index_t lisp_gpe_tunnel_find_or_create_and_lock (const locator_pair_t *
+							pair,
+							u32 rloc_fib_index);
+
+extern void lisp_gpe_tunnel_unlock (index_t lgti);
+
+extern const lisp_gpe_tunnel_t *lisp_gpe_tunnel_get (index_t lgti);
+
+extern u8 *lisp_gpe_tunnel_build_rewrite (const lisp_gpe_tunnel_t * lgt,
+					  const struct lisp_gpe_adjacency_t_
+					  *ladj,
+					  lisp_gpe_next_protocol_e
+					  payload_proto);
+extern u8 *format_lisp_gpe_tunnel (u8 * s, va_list * args);
+
+#endif
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */