diff --git a/include/common/sessionhash.h b/include/common/sessionhash.h
new file mode 100644
index 0000000..da5fde0
--- /dev/null
+++ b/include/common/sessionhash.h
@@ -0,0 +1,62 @@
+#ifndef SESSION_HASH_H
+#define SESSION_HASH_H
+
+/*
+ * HashTable functions.
+ *
+ * Copyright 2007 Arnaud Cornet
+ *
+ * This file is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License, version 2.1 as published by the Free Software Foundation.
+ *
+ */
+
+#include <common/appsession.h>
+
+#ifndef TABLESHIFT
+#define TABLESHIFT 11
+#endif
+#define TABLESIZE (1UL << TABLESHIFT)
+#define TABLEMASK (TABLESIZE - 1)
+
+/*
+ * quick and dirty AppSession hash table, using sessid as key
+ */
+
+struct appsession_hash
+{
+	struct list *table;
+	void (*destroy)(appsess *);
+};
+
+unsigned int appsession_hash_f(char *);
+int appsession_hash_init(struct appsession_hash *hash,
+		void(*destroy)(appsess*));
+void appsession_hash_insert(struct appsession_hash *hash,
+		struct appsessions *session);
+struct appsessions *appsession_hash_lookup(struct appsession_hash *hash,
+		char *key);
+void appsession_hash_remove(struct appsession_hash *hash,
+		struct appsessions *session);
+
+void appsession_hash_destroy(struct appsession_hash *hash);
+#if defined(DEBUG_HASH)
+void appsession_hash_dump(struct appsession_hash *hash);
+#endif
+
+/*
+ * Iterates <item> through a hashtable of items of type "typeof(*item)"
+ * A pointer to the appsession_hash is passed in <hash>. The hash table
+ * internaly uses <list_head> member of the struct. A temporary variable <back>
+ * of same type as <item> is needed so that <item> may safely be deleted if
+ * needed.  <idx> is a variable containing <item>'s current bucket index in the
+ * hash table.
+ * Example: as_hash_for_each_entry_safe(idx, item, tmp, &hash, hash_list)
+ * { ... }
+ */
+#define as_hash_for_each_entry_safe(idx, item, back, hash, member) \
+	 for (idx = 0; idx < TABLESIZE; idx++)                          \
+		list_for_each_entry_safe(item, back, &((hash)->table[idx]), member)
+
+#endif /* SESSION_HASH_H */