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diff --git a/lib/src/protocol.h b/lib/src/protocol.h
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+/*
+ * Copyright (c) 2017-2019 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 protocol.h
+ * @brief Protocol header definitions
+ */
+#ifndef HICN_PROTOCOL_H
+#define HICN_PROTOCOL_H
+
+#include "protocol/ah.h"
+#include "protocol/ipv4.h"
+#include "protocol/ipv6.h"
+#include "protocol/icmp.h"
+#include "protocol/icmprd.h"
+#include "protocol/tcp.h"
+#include "protocol/udp.h"
+
+typedef union
+{
+  _ipv4_header_t ipv4;
+  _ipv6_header_t ipv6;
+  _tcp_header_t tcp;
+  _udp_header_t udp;
+  _icmp_header_t icmp;
+  _icmprd_header_t icmprd;
+  _ah_header_t ah;
+  void *bytes;
+} hicn_protocol_t;
+
+#endif /* HICN_PROTOCOL_H */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */