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diff --git a/test/packetdrill/hash_map.h b/test/packetdrill/hash_map.h
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+/*
+ * Copyright 2013 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+/*
+ * Author: ncardwell@google.com (Neal Cardwell)
+ *
+ * Interface and data structure declarations for a simple hash map
+ * mapping u32 keys to u32 values.
+ */
+
+#ifndef __HASH_MAP_H__
+#define __HASH_MAP_H__
+
+#include "types.h"
+
+/* Node for hash table buckets; maps u32 key to u32 value. */
+struct hash_node {
+	u32 key;
+	u32 value;
+	struct hash_node *next;
+};
+
+/* Hash map mapping u32 to u32. */
+struct hash_map {
+	size_t num_keys;		/* number of keys */
+	size_t num_buckets;		/* number of buckets (a power of 2) */
+	size_t bucket_mask;		/* bit mask to find bucket number */
+	struct hash_node **buckets;	/* array of hash buckets */
+};
+
+extern struct hash_map *hash_map_new(size_t num_keys);
+
+extern void hash_map_free(struct hash_map *map);
+
+extern void hash_map_set(struct hash_map *map,
+			 u32 key, u32 value);
+
+extern bool hash_map_get(const struct hash_map *map,
+			 u32 key, u32 *value);
+
+#endif /* __HASH_MAP_H__ */