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diff --git a/src/plugins/mss_clamp/mss_clamp.h b/src/plugins/mss_clamp/mss_clamp.h
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+++ b/src/plugins/mss_clamp/mss_clamp.h
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+/*
+ * mss_clamp.h - TCP MSS clamping plug-in header file
+ *
+ * Copyright (c) 2018 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.
+ */
+
+#ifndef __included_mss_clamp_h__
+#define __included_mss_clamp_h__
+
+#include <stdbool.h> /* for bool in .api */
+#include <vnet/vnet.h>
+
+extern int mssc_enable_disable (u32 sw_if_index, u8 dir4, u8 dir6, u16 mss4,
+				u16 mss6);
+extern int mssc_get_mss (u32 sw_if_index, u8 *dir4, u8 *dir6, u16 *mss4,
+			 u16 *mss6);
+
+typedef struct
+{
+  /* Maximum segment size per interface for IPv4/IPv6 */
+  u16 *max_mss4;
+  u16 *max_mss6;
+
+  /* Direction the feature is enabled for IPv4/IPv6 (rx, tx, both) */
+  u8 *dir_enabled4;
+  u8 *dir_enabled6;
+
+  /* API message ID base */
+  u16 msg_id_base;
+} mssc_main_t;
+
+extern mssc_main_t mssc_main;
+
+#define MSS_CLAMP_UNSET 0xffff
+
+#endif /* __included_mss_clamp_h__ */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */