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diff --git a/src/plugins/ioam/udp-ping/udp_ping.h b/src/plugins/ioam/udp-ping/udp_ping.h
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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.
+ */
+
+#ifndef PLUGINS_IOAM_PLUGIN_IOAM_UDP_PING_UDP_PING_H_
+#define PLUGINS_IOAM_PLUGIN_IOAM_UDP_PING_UDP_PING_H_
+
+#include <ioam/analyse/ioam_analyse.h>
+
+#define MAX_PING_RETRIES 5
+
+#define EVENT_SIG_RECHECK 2
+
+/** @brief udp-ping session data.
+    @note cache aligned.
+*/
+typedef struct
+{
+  /** UDP ping packet */
+  u8 *ping_rewrite;
+
+  /** Ping packet rewrite string len. */
+  u16 rewrite_len;
+
+  /** Number of times ping response was dropped.
+   * If retry > MAX_PING_RETRIES then declare connectivity as down.
+   */
+  u16 retry;
+
+  u16 reserve[2];
+
+  /** Analysed data. */
+  ioam_analyser_data_t analyse_data;
+
+  /** This is used by ioam e2e for identifying flow and add seq number. */
+  u32 flow_ctx;
+
+  /** No of packets sent for this flow. */
+  u32 pak_sent;
+} udp_ping_flow_data;
+
+/** @brief udp-ping flow data.
+    @note cache aligned.
+*/
+typedef struct
+{
+  /** Time at which next udp-ping probe has to be sent out. */
+  f64 next_send_time;
+
+  /** Interval for which ping packet to be sent. */
+  u16 interval;
+
+  u16 reserve[3];
+
+  /** Defines start port of the src port range. */
+  u16 start_src_port;
+
+  /** Defines end port of the src port range. */
+  u16 end_src_port;
+
+  /** Defines start port of the dest port range. */
+  u16 start_dst_port;
+
+  /** Defines end port of the dest port range. */
+  u16 end_dst_port;
+
+  /** Ping statistics. */
+  udp_ping_flow_data *stats;
+
+} udp_ping_flow;
+
+/** @brief udp-ping data.
+*/
+typedef struct
+{
+  /** Local source IPv4/6 address to be used. */
+  ip46_address_t src;
+
+  /** Remote destination IPv4/6 address to be used. */
+  ip46_address_t dst;
+
+  /** Per flow data. */
+  udp_ping_flow udp_data;
+
+  /** To enable fault detection/isolation in network. */
+  u8 fault_det;
+} ip46_udp_ping_flow;
+
+/** @brief udp-ping main data-structure.
+*/
+typedef struct
+{
+  /** Vector od udp-ping data */
+  ip46_udp_ping_flow *ip46_flow;
+
+  /** Stores the time interval at which process node has to wake up. */
+  u64 timer_interval;
+
+  /** Pointer to VLib main for the node - ipfix-collector. */
+  vlib_main_t *vlib_main;
+
+  /** Pointer to vnet main for convenience. */
+  vnet_main_t *vnet_main;
+
+  /** API message ID base */
+  u16 msg_id_base;
+} udp_ping_main_t;
+
+extern udp_ping_main_t udp_ping_main;
+
+void
+ip46_udp_ping_set_flow (ip46_address_t src, ip46_address_t dst,
+			u16 start_src_port, u16 end_src_port,
+			u16 start_dst_port, u16 end_dst_port,
+			u16 interval, u8 fault_det, u8 is_disable);
+
+clib_error_t *udp_ping_flow_create (u8 del);
+
+#endif /* PLUGINS_IOAM_PLUGIN_IOAM_UDP_PING_UDP_PING_H_ */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */