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diff --git a/src/plugins/gtpu/gtpu.api b/src/plugins/gtpu/gtpu.api
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+/*
+ * Copyright (c) 2017 Intel 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.
+ */
+
+/** \brief Set or delete an GTPU tunnel
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param is_add - add address if non-zero, else delete
+    @param is_ipv6 - src_address and dst_address is ipv6 or not
+    @param src_address - GTPU tunnel's source address.
+    @param dst_address - GTPU tunnel's destination address.
+    @param mcast_sw_if_index - version, O-bit and C-bit (see nsh_packet.h)
+    @param encap_vrf_id - fib identifier used for outgoing encapsulated packets
+    @param decap_next_index - the index of the next node if success
+    @param teid - Local Tunnel Endpoint Identifier
+*/
+define gtpu_add_del_tunnel
+{
+  u32 client_index;
+  u32 context;
+  u8 is_add;
+  u8 is_ipv6;
+  u8 src_address[16];
+  u8 dst_address[16];
+  u32 mcast_sw_if_index;
+  u32 encap_vrf_id;
+  u32 decap_next_index;
+  u32 teid;
+};
+
+/** \brief reply for set or delete an GTPU tunnel
+    @param context - sender context, to match reply w/ request
+    @param retval - return code
+    @param sw_if_index - software index of the interface
+*/
+define gtpu_add_del_tunnel_reply
+{
+  u32 context;
+  i32 retval;
+  u32 sw_if_index;
+};
+
+/** \brief Dump GTPU tunnel
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param sw_if_index - software index of the interface
+*/
+define gtpu_tunnel_dump
+{
+  u32 client_index;
+  u32 context;
+  u32 sw_if_index;
+};
+
+/** \brief dump details of an GTPU tunnel
+    @param context - sender context, to match reply w/ request
+    @param sw_if_index - software index of the interface
+    @param is_ipv6 - src_address and dst_address is ipv6 or not
+    @param src_address - GTPU tunnel's source address.
+    @param dst_address - GTPU tunnel's destination address.
+    @param mcast_sw_if_index - version, O-bit and C-bit (see nsh_packet.h)
+    @param encap_vrf_id - fib identifier used for outgoing encapsulated packets
+    @param decap_next_index - the index of the next node if success
+    @param teid - Local Tunnel Endpoint Identifier
+*/
+define gtpu_tunnel_details
+{
+  u32 context;
+  u32 sw_if_index;
+  u8 is_ipv6;
+  u8 src_address[16];
+  u8 dst_address[16];
+  u32 mcast_sw_if_index;
+  u32 encap_vrf_id;
+  u32 decap_next_index;
+  u32 teid;
+};
+
+/** \brief Interface set gtpu-bypass request
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param sw_if_index - interface used to reach neighbor
+    @param is_ipv6 - if non-zero, enable ipv6-gtpu-bypass, else ipv4-gtpu-bypass
+    @param enable - if non-zero enable, else disable
+*/
+define sw_interface_set_gtpu_bypass
+{
+  u32 client_index;
+  u32 context;
+  u32 sw_if_index;
+  u8 is_ipv6;
+  u8 enable;
+};
+
+/** \brief Interface set gtpu-bypass response
+    @param context - sender context, to match reply w/ request
+    @param retval - return code for the request
+*/
+define sw_interface_set_gtpu_bypass_reply
+{
+  u32 context;
+  i32 retval;
+};
+
+/*
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */