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diff --git a/src/plugins/stn/stn.api b/src/plugins/stn/stn.api
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+/*
+ * Copyright (c) 2017 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 stn.api
+ * @brief VPP control-plane API messages for STN plugin.
+ *
+ */
+
+
+/** \brief Add/del STN rules
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param is_ip4 - 1 if address type is IPv4
+    @param ip_address - STN rule IP address
+    @param sw_if_index - Interface index
+    @param is_add - 1 if add, 0 if delete
+*/
+autoreply manual_print define stn_add_del_rule {
+  u32 client_index;
+  u32 context;
+  u8 is_ip4;
+  u8 ip_address[16];
+  u32 sw_if_index;
+  u8 is_add;
+};
+
+/** \brief Dump STN rules
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+*/
+define stn_rules_dump {
+  u32 client_index;
+  u32 context;
+};
+
+/** \brief STN response to rules request
+    @param context - sender context, to match reply w/ request
+    @param is_ip4 - 1 if address type is IPv4
+    @param ip_address - IP address
+    @param sw_if_index - Interface index
+*/
+define stn_rule_details {
+  u32 context;
+  u8 is_ip4;
+  u8 ip_address[16];
+  u32 sw_if_index;
+};
+