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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 Mcast Adjacency
+ *
+ * The multicast adjacency forwards IP traffic on an interface toward a multicast
+ * group address. This is a different type of adjacency to a unicast adjacency
+ * since the application of the MAC header is different, and so the VLIB node
+ * visited is also different. DPO types have different VLIB nodes.
+ */
+
+#ifndef __ADJ_MCAST_H__
+#define __ADJ_MCAST_H__
+
+#include <vnet/adj/adj_types.h>
+
+/**
+ * @brief
+ * Add (and lock) a new or lock an existing mcast adjacency
+ *
+ * @param proto
+ * The protocol for the neighbours that we wish to mcast
+ *
+ * @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 to mcast
+ */
+extern adj_index_t adj_mcast_add_or_lock(fib_protocol_t proto,
+ vnet_link_t link_type,
+ u32 sw_if_index);
+
+/**
+ * @brief
+ * Update the rewrite string for an existing adjacecny.
+ *
+ * @param
+ * The index of the adj to update
+ *
+ * @param
+ * The new rewrite
+ */
+extern void adj_mcast_update_rewrite(adj_index_t adj_index,
+ u8 *rewrite);
+
+/**
+ * @brief Format/display a mcast adjacency.
+ */
+extern u8* format_adj_mcast(u8* s, va_list *ap);
+
+/**
+ * @brief Get the sze of the mcast adj DB. Test purposes only.
+ */
+extern u32 adj_mcast_db_size(void);
+
+/**
+ * @brief
+ * Module initialisation
+ */
+extern void adj_mcast_module_init(void);
+
+#endif