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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.
+ */
+/**
+ * Midchain Adjacency sub-type. These adjs represent an L3 peer on a
+ * tunnel interface. The tunnel's adjacency is thus not the end of the chain,
+ * and needs to stack on/link to another chain (or portion of the graph) to
+ * reach the tunnel's destination.
+ */
+
+#ifndef __ADJ_MIDCHAIN_H__
+#define __ADJ_MIDCHAIN_H__
+
+#include <vnet/adj/adj.h>
+
+/**
+ * @brief Flags controlling the midchain adjacency
+ */
+typedef enum adj_midchain_flag_t_
+{
+ /**
+ * No flags
+ */
+ ADJ_MIDCHAIN_FLAG_NONE = 0,
+
+ /**
+ * Packets TX through the midchain do not increment the interface
+ * counters. This should be used when the adj is associated with an L2
+ * interface and that L2 interface is in a bridege domain. In that case
+ * the packet will have traversed the interface's TX node, and hence have
+ * been counted, before it traverses ths midchain
+ */
+ ADJ_MIDCHAIN_FLAG_NO_COUNT = (1 << 0),
+} adj_midchain_flag_t;
+
+/**
+ * @brief
+ * Convert an existing neighbour adjacency into a midchain
+ *
+ * @param adj_index
+ * The index of the neighbour adjacency.
+ *
+ * @param post_rewrite_node
+ * The VLIB graph node that provides the post-encap fixup.
+ * where 'fixup' is e.g., correcting chksum, length, etc.
+ *
+ * @param rewrite
+ * The rewrite.
+ */
+extern void adj_nbr_midchain_update_rewrite(adj_index_t adj_index,
+ adj_midchain_fixup_t fixup,
+ adj_midchain_flag_t flags,
+ u8 *rewrite);
+
+/**
+ * @brief
+ * [re]stack a midchain. 'Stacking' is the act of forming parent-child
+ * relationships in the data-plane graph.
+ *
+ * @param adj_index
+ * The index of the midchain to stack
+ *
+ * @param dpo
+ * The parent DPO to stack onto (i.e. become a child of).
+ */
+extern void adj_nbr_midchain_stack(adj_index_t adj_index,
+ const dpo_id_t *dpo);
+
+/**
+ * @brief
+ * unstack a midchain. This will break the chain between the midchain and
+ * the next graph section. This is a implemented as stack-on-drop
+ *
+ * @param adj_index
+ * The index of the midchain to stack
+ */
+extern void adj_nbr_midchain_unstack(adj_index_t adj_index);
+
+/**
+ * @brief
+ * Module initialisation
+ */
+extern void adj_midchain_module_init(void);
+
+/**
+ * @brief
+ * Format a midchain adjacency
+ */
+extern u8* format_adj_midchain(u8* s, va_list *ap);
+
+#endif