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diff --git a/src/vnet/tcp/tcp_bt.h b/src/vnet/tcp/tcp_bt.h
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+++ b/src/vnet/tcp/tcp_bt.h
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+/*
+ * Copyright (c) 2020 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.
+ */
+
+/*
+ * Rate estimation
+ */
+
+#ifndef SRC_VNET_TCP_TCP_BT_H_
+#define SRC_VNET_TCP_TCP_BT_H_
+
+#include <vnet/tcp/tcp_types.h>
+
+/**
+ * Byte tracker initialize
+ *
+ * @param tc	connection for which the byte tracker should be allocated and
+ * 		initialized
+ */
+void tcp_bt_init (tcp_connection_t * tc);
+/**
+ * Byte tracker cleanup
+ *
+ * @param tc	connection for which the byte tracker should be cleaned up
+ */
+void tcp_bt_cleanup (tcp_connection_t * tc);
+/**
+ * Flush byte tracker samples
+ *
+ * @param tc	tcp connection for which samples should be flushed
+ */
+void tcp_bt_flush_samples (tcp_connection_t * tc);
+/**
+ * Track a tcp tx burst
+ *
+ * @param tc	tcp connection
+ */
+void tcp_bt_track_tx (tcp_connection_t * tc, u32 len);
+/**
+ * Track a tcp retransmission
+ *
+ * @param tc	tcp connection
+ * @param start	start sequence number
+ * @param end	end sequence number
+ */
+void tcp_bt_track_rxt (tcp_connection_t * tc, u32 start, u32 end);
+/**
+ * Generate a delivery rate sample from recently acked bytes
+ *
+ * @param tc	tcp connection
+ * @param rs	resulting rate sample
+ */
+void tcp_bt_sample_delivery_rate (tcp_connection_t * tc,
+				  tcp_rate_sample_t * rs);
+/**
+ * Check if sample to be generated is app limited
+ *
+ * @param tc	tcp connection
+ */
+void tcp_bt_check_app_limited (tcp_connection_t * tc);
+/**
+ * Check if the byte tracker is in sane state
+ *
+ * Should be used only for testing
+ *
+ * @param bt	byte tracker
+ */
+int tcp_bt_is_sane (tcp_byte_tracker_t * bt);
+
+format_function_t format_tcp_bt;
+
+#endif /* SRC_VNET_TCP_TCP_BT_H_ */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */