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diff --git a/vnet/vnet/adj/adj_alloc.h b/vnet/vnet/adj/adj_alloc.h
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+++ b/vnet/vnet/adj/adj_alloc.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.
+ */
+
+#ifndef __adj_alloc_h__
+#define __adj_alloc_h__
+
+/**
+ * @brief
+ * Adjacency allocator: heap-like in that the code
+ * will dole out contiguous chunks of n items. In the interests of 
+ * thread safety, we don't bother about coalescing free blocks of size r
+ * into free blocks of size s, where r < s.
+ * 
+ * We include explicit references to worker thread barrier synchronization
+ * where necessary.  
+ */ 
+
+#include <vppinfra/vec.h>
+#include <vlib/vlib.h>
+#include <vnet/ip/lookup.h>
+
+typedef struct {
+  u32 ** free_indices_by_size;
+} aa_header_t;
+
+#define aa_aligned_header_bytes \
+  vec_aligned_header_bytes (sizeof (aa_header_t), sizeof (void *))
+
+/* Pool header from user pointer */
+static inline aa_header_t * aa_header (void * v)
+{
+  return vec_aligned_header (v, sizeof (aa_header_t), sizeof (void *));
+}
+
+extern ip_adjacency_t *aa_alloc(void);
+extern void aa_free (ip_adjacency_t * adj);
+extern void aa_bootstrap (u32 n);
+
+format_function_t format_adj_allocation;
+
+#endif /* __adj_alloc_h__ */