diff --git a/lib/memory.h b/lib/memory.h
new file mode 100644
index 0000000..52e3bc1
--- /dev/null
+++ b/lib/memory.h
@@ -0,0 +1,245 @@
+/* Memory management routine
+   Copyright (C) 1998 Kunihiro Ishiguro
+
+This file is part of GNU Zebra.
+
+GNU Zebra 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, or (at your option) any
+later version.
+
+GNU Zebra 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 GNU Zebra; see the file COPYING.  If not, write to the Free
+Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+02111-1307, USA.  */
+
+#ifndef _ZEBRA_MEMORY_H
+#define _ZEBRA_MEMORY_H
+
+/* #define MEMORY_LOG */
+
+/* For tagging memory, below is the type of the memory. */
+enum
+{
+  MTYPE_TMP = 1,
+  MTYPE_STRVEC,
+  MTYPE_VECTOR,
+  MTYPE_VECTOR_INDEX,
+  MTYPE_LINK_LIST,
+  MTYPE_LINK_NODE,
+  MTYPE_THREAD,
+  MTYPE_THREAD_MASTER,
+  MTYPE_VTY,
+  MTYPE_VTY_HIST,
+  MTYPE_VTY_OUT_BUF,
+  MTYPE_IF,
+  MTYPE_CONNECTED,
+  MTYPE_AS_SEG,
+  MTYPE_AS_STR,
+  MTYPE_AS_PATH,
+  MTYPE_CLUSTER,
+  MTYPE_CLUSTER_VAL,
+  MTYPE_ATTR,
+  MTYPE_TRANSIT,
+  MTYPE_TRANSIT_VAL,
+  MTYPE_BUFFER,
+  MTYPE_BUFFER_DATA,
+  MTYPE_STREAM,
+  MTYPE_STREAM_DATA,
+  MTYPE_STREAM_FIFO,
+  MTYPE_PREFIX,
+  MTYPE_PREFIX_IPV4,
+  MTYPE_PREFIX_IPV6,
+  MTYPE_HASH,
+  MTYPE_HASH_INDEX,
+  MTYPE_HASH_BACKET,
+  MTYPE_RIPNG_ROUTE,
+  MTYPE_RIPNG_AGGREGATE,
+  MTYPE_ROUTE_TABLE,
+  MTYPE_ROUTE_NODE,
+  MTYPE_ACCESS_LIST,
+  MTYPE_ACCESS_LIST_STR,
+  MTYPE_ACCESS_FILTER,
+  MTYPE_PREFIX_LIST,
+  MTYPE_PREFIX_LIST_STR,
+  MTYPE_PREFIX_LIST_ENTRY,
+  MTYPE_ROUTE_MAP,
+  MTYPE_ROUTE_MAP_NAME,
+  MTYPE_ROUTE_MAP_INDEX,
+  MTYPE_ROUTE_MAP_RULE,
+  MTYPE_ROUTE_MAP_RULE_STR,
+  MTYPE_ROUTE_MAP_COMPILED,
+
+  MTYPE_RIB,
+  MTYPE_DISTRIBUTE,
+  MTYPE_ZLOG,
+  MTYPE_ZCLIENT,
+  MTYPE_NEXTHOP,
+  MTYPE_RTADV_PREFIX,
+  MTYPE_IF_RMAP,
+  MTYPE_SOCKUNION,
+  MTYPE_STATIC_IPV4,
+  MTYPE_STATIC_IPV6,
+
+  MTYPE_DESC,
+  MTYPE_OSPF_TOP,
+  MTYPE_OSPF_AREA,
+  MTYPE_OSPF_AREA_RANGE,
+  MTYPE_OSPF_NETWORK,
+  MTYPE_OSPF_NEIGHBOR_STATIC,
+  MTYPE_OSPF_IF,
+  MTYPE_OSPF_NEIGHBOR,
+  MTYPE_OSPF_ROUTE,
+  MTYPE_OSPF_TMP,
+  MTYPE_OSPF_LSA,
+  MTYPE_OSPF_LSA_DATA,
+  MTYPE_OSPF_LSDB,
+  MTYPE_OSPF_PACKET,
+  MTYPE_OSPF_FIFO,
+  MTYPE_OSPF_VERTEX,
+  MTYPE_OSPF_NEXTHOP,
+  MTYPE_OSPF_PATH,
+  MTYPE_OSPF_VL_DATA,
+  MTYPE_OSPF_CRYPT_KEY,
+  MTYPE_OSPF_EXTERNAL_INFO,
+  MTYPE_OSPF_MESSAGE,
+  MTYPE_OSPF_DISTANCE,
+  MTYPE_OSPF_IF_INFO,
+  MTYPE_OSPF_IF_PARAMS,
+
+  MTYPE_OSPF6_TOP,
+  MTYPE_OSPF6_AREA,
+  MTYPE_OSPF6_IF,
+  MTYPE_OSPF6_NEIGHBOR,
+  MTYPE_OSPF6_ROUTE,
+  MTYPE_OSPF6_PREFIX,
+  MTYPE_OSPF6_MESSAGE,
+  MTYPE_OSPF6_LSA,
+  MTYPE_OSPF6_LSA_SUMMARY,
+  MTYPE_OSPF6_LSDB,
+  MTYPE_OSPF6_VERTEX,
+  MTYPE_OSPF6_SPFTREE,
+  MTYPE_OSPF6_NEXTHOP,
+  MTYPE_OSPF6_EXTERNAL_INFO,
+  MTYPE_OSPF6_OTHER,
+
+  MTYPE_BGP,
+  MTYPE_BGP_PEER,
+  MTYPE_PEER_GROUP,
+  MTYPE_PEER_DESC,
+  MTYPE_PEER_UPDATE_SOURCE,
+  MTYPE_BGP_STATIC,
+  MTYPE_BGP_AGGREGATE,
+  MTYPE_BGP_CONFED_LIST,
+  MTYPE_BGP_NEXTHOP_CACHE,
+  MTYPE_BGP_DAMP_INFO,
+  MTYPE_BGP_DAMP_ARRAY,
+  MTYPE_BGP_ANNOUNCE,
+  MTYPE_BGP_ATTR_QUEUE,
+  MTYPE_BGP_ROUTE_QUEUE,
+  MTYPE_BGP_DISTANCE,
+  MTYPE_BGP_ROUTE,
+  MTYPE_BGP_TABLE,
+  MTYPE_BGP_NODE,
+  MTYPE_BGP_ADVERTISE_ATTR,
+  MTYPE_BGP_ADVERTISE,
+  MTYPE_BGP_ADJ_IN,
+  MTYPE_BGP_ADJ_OUT,
+  MTYPE_BGP_REGEXP,
+  MTYPE_AS_FILTER,
+  MTYPE_AS_FILTER_STR,
+  MTYPE_AS_LIST,
+
+  MTYPE_COMMUNITY,
+  MTYPE_COMMUNITY_VAL,
+  MTYPE_COMMUNITY_STR,
+
+  MTYPE_ECOMMUNITY,
+  MTYPE_ECOMMUNITY_VAL,
+  MTYPE_ECOMMUNITY_STR,
+
+  /* community-list and extcommunity-list.  */
+  MTYPE_COMMUNITY_LIST_HANDLER,
+  MTYPE_COMMUNITY_LIST,
+  MTYPE_COMMUNITY_LIST_NAME,
+  MTYPE_COMMUNITY_LIST_ENTRY,
+  MTYPE_COMMUNITY_LIST_CONFIG,
+
+  MTYPE_RIP,
+  MTYPE_RIP_INTERFACE,
+  MTYPE_RIP_DISTANCE,
+  MTYPE_RIP_OFFSET_LIST,
+  MTYPE_RIP_INFO,
+  MTYPE_RIP_PEER,
+  MTYPE_KEYCHAIN,
+  MTYPE_KEY,
+
+  MTYPE_VTYSH_CONFIG,
+  MTYPE_VTYSH_CONFIG_LINE,
+
+  MTYPE_VRF,
+  MTYPE_VRF_NAME,
+
+  MTYPE_MAX
+};
+
+#ifdef MEMORY_LOG
+#define XMALLOC(mtype, size) \
+  mtype_zmalloc (__FILE__, __LINE__, (mtype), (size))
+#define XCALLOC(mtype, size) \
+  mtype_zcalloc (__FILE__, __LINE__, (mtype), (size))
+#define XREALLOC(mtype, ptr, size)  \
+  mtype_zrealloc (__FILE__, __LINE__, (mtype), (ptr), (size))
+#define XFREE(mtype, ptr) \
+  mtype_zfree (__FILE__, __LINE__, (mtype), (ptr))
+#define XSTRDUP(mtype, str) \
+  mtype_zstrdup (__FILE__, __LINE__, (mtype), (str))
+#else
+#define XMALLOC(mtype, size)       zmalloc ((mtype), (size))
+#define XCALLOC(mtype, size)       zcalloc ((mtype), (size))
+#define XREALLOC(mtype, ptr, size) zrealloc ((mtype), (ptr), (size))
+#define XFREE(mtype, ptr)          zfree ((mtype), (ptr))
+#define XSTRDUP(mtype, str)        zstrdup ((mtype), (str))
+#endif /* MEMORY_LOG */
+
+/* Prototypes of memory function. */
+void *zmalloc (int type, size_t size);
+void *zcalloc (int type, size_t size);
+void *zrealloc (int type, void *ptr, size_t size);
+void  zfree (int type, void *ptr);
+char *zstrdup (int type, char *str);
+
+void *mtype_zmalloc (const char *file,
+		     int line,
+		     int type,
+		     size_t size);
+
+void *mtype_zcalloc (const char *file,
+		     int line,
+		     int type,
+		     size_t num,
+		     size_t size);
+
+void *mtype_zrealloc (const char *file,
+		     int line,
+		     int type, 
+		     void *ptr,
+		     size_t size);
+
+void mtype_zfree (const char *file,
+		  int line,
+		  int type,
+		  void *ptr);
+
+char *mtype_zstrdup (const char *file,
+		     int line,
+		     int type,
+		     char *str);
+void memory_init ();
+
+#endif /* _ZEBRA_MEMORY_H */