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diff --git a/vnet/vnet/adj/adj_rewrite.h b/vnet/vnet/adj/adj_rewrite.h
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+++ b/vnet/vnet/adj/adj_rewrite.h
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+/*
+ * Copyright (c) 2016 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.
+ */
+/**
+ * @brief
+ * A rewrite adjacency has no key, and thus cannot be 'found' from the
+ * FIB resolution code. the client therefore needs to maange these adjacencies
+ */
+
+#ifndef __ADJ_REWRITE_H__
+#define __ADJ_REWRITE_H__
+
+#include <vnet/adj/adj_types.h>
+
+/**
+ * @brief
+ *  Add (and lock) a new or lock an existing neighbour adjacency
+ *
+ * @param nh_proto
+ *  The protocol for the next-hop address (v4 or v6)
+ *
+ * @param link_type
+ *  A description of the protocol of the packets that will forward
+ *  through this adj. On an ethernet interface this is the MAC header's
+ *  ether-type
+ *
+ * @param sw_if_index
+ *  The interface on which the peer resides
+ *
+ * @param rewrite
+ *  The rewrite to prepend to packets
+ */
+extern adj_index_t adj_rewrite_add_and_lock(fib_protocol_t nh_proto,
+					    fib_link_t link_type,
+					    u32 sw_if_index,
+					    u8 *rewrite);
+
+#endif