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diff --git a/fluent-bit/include/fluent-bit/flb_routes_mask.h b/fluent-bit/include/fluent-bit/flb_routes_mask.h
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+++ b/fluent-bit/include/fluent-bit/flb_routes_mask.h
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+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+
+/*  Fluent Bit
+ *  ==========
+ *  Copyright (C) 2015-2022 The Fluent Bit Authors
+ *
+ *  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.
+ */
+
+/*
+ * This file defines a few utility methods for handling the routing masks
+ * used by input chunks to keep track of which output plugins they are
+ * routed to.
+ */
+#ifndef FLB_ROUTES_MASK_H
+#define FLB_ROUTES_MASK_H
+
+#include <limits.h>
+
+/*
+ * The routing mask is an array integers used to store a bitfield. Each
+ * bit represents the unique id of an output plugin. For example, the 9th
+ * bit in the routes_mask represents the output plugin with id = 9.
+ *
+ * A value of 1 in the bitfield means that output plugin is selected
+ * and a value of zero means that output is deselected.
+ *
+ * The size of the bitmask array limits the number of output plugins
+ * The router can route to. For example: with a value of 4 using
+ * 64-bit integers the bitmask can represent up to 256 output plugins
+ */
+#define FLB_ROUTES_MASK_ELEMENTS		4
+
+/*
+ * How many bits are in each element of the bitmask array
+ */
+#define FLB_ROUTES_MASK_ELEMENT_BITS 	(sizeof(uint64_t) * CHAR_BIT)
+
+/*
+ * The maximum number of routes that can be stored in the array
+ */
+#define FLB_ROUTES_MASK_MAX_VALUE		(FLB_ROUTES_MASK_ELEMENTS * FLB_ROUTES_MASK_ELEMENT_BITS)
+
+
+/* forward declaration */
+struct flb_input_instance;
+
+
+int flb_routes_mask_set_by_tag(uint64_t *routes_mask, const char *tag, int tag_len, struct flb_input_instance *in);
+int flb_routes_mask_get_bit(uint64_t *routes_mask, int value);
+void flb_routes_mask_set_bit(uint64_t *routes_mask, int value);
+void flb_routes_mask_clear_bit(uint64_t *routes_mask, int value);
+int flb_routes_mask_is_empty(uint64_t *routes_mask);
+
+#endif