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diff --git a/src/vnet/ip/ip_sas.h b/src/vnet/ip/ip_sas.h
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+/*
+ * Copyright (c) 2021 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_ip_sas_h
+#define included_ip_sas_h
+
+#include <stdbool.h>
+#include <vnet/ip/ip6_packet.h>
+#include <vnet/ip/ip4_packet.h>
+
+bool ip6_sas_by_sw_if_index (u32 sw_if_index, const ip6_address_t *dst,
+ ip6_address_t *src);
+bool ip4_sas_by_sw_if_index (u32 sw_if_index, const ip4_address_t *dst,
+ ip4_address_t *src);
+bool ip6_sas (u32 table_id, u32 sw_if_index, const ip6_address_t *dst,
+ ip6_address_t *src);
+bool ip4_sas (u32 table_id, u32 sw_if_index, const ip4_address_t *dst,
+ ip4_address_t *src);
+
+#endif