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diff --git a/VNFs/DPPD-PROX/gre.h b/VNFs/DPPD-PROX/gre.h
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+/*
+// Copyright (c) 2010-2017 Intel Corporation
+//
+// 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 _GRE_H_
+#define _GRE_H_
+
+#define GRE_CRC_PRESENT 0x10
+#define GRE_ROUTING_PRESENT 0x08
+#define GRE_KEY_PRESENT 0x04
+#define GRE_SEQNUM_PRESENT 0x02
+#define GRE_STRICT_ROUTE 0x01
+
+struct gre_hdr {
+ uint8_t recur: 3; /* recur */
+ uint8_t bits: 5; /* bits: Checksum, Routing, Key, Sequence Number, strict Route */
+ uint8_t version: 3; /* Version: must be 0 */
+ uint8_t flags: 5; /* Flags: must be 0 */
+ uint16_t type; /* Protocol type */
+ uint32_t gre_id; /* Key ID */
+} __attribute__((__packed__));
+
+#endif /* _GRE_H_ */