diff --git a/lib/if_rmap.c b/lib/if_rmap.c
new file mode 100644
index 0000000..4227102
--- /dev/null
+++ b/lib/if_rmap.c
@@ -0,0 +1,306 @@
+/* route-map for interface.
+ * Copyright (C) 1999 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.  
+ */
+
+#include <zebra.h>
+
+#include "hash.h"
+#include "command.h"
+#include "memory.h"
+#include "if.h"
+#include "if_rmap.h"
+
+struct hash *ifrmaphash;
+
+/* Hook functions. */
+void (*if_rmap_add_hook) (struct if_rmap *) = NULL;
+void (*if_rmap_delete_hook) (struct if_rmap *) = NULL;
+
+struct if_rmap *
+if_rmap_new ()
+{
+  struct if_rmap *new;
+
+  new = XCALLOC (MTYPE_IF_RMAP, sizeof (struct if_rmap));
+
+  return new;
+}
+
+void
+if_rmap_free (struct if_rmap *if_rmap)
+{
+  if (if_rmap->ifname)
+    free (if_rmap->ifname);
+
+  if (if_rmap->routemap[IF_RMAP_IN])
+    free (if_rmap->routemap[IF_RMAP_IN]);
+  if (if_rmap->routemap[IF_RMAP_OUT])
+    free (if_rmap->routemap[IF_RMAP_OUT]);
+
+  XFREE (MTYPE_IF_RMAP, if_rmap);
+}
+
+struct if_rmap *
+if_rmap_lookup (char *ifname)
+{
+  struct if_rmap key;
+  struct if_rmap *if_rmap;
+
+  key.ifname = ifname;
+
+  if_rmap = hash_lookup (ifrmaphash, &key);
+  
+  return if_rmap;
+}
+
+void
+if_rmap_hook_add (void (*func) (struct if_rmap *))
+{
+  if_rmap_add_hook = func;
+}
+
+void
+if_rmap_hook_delete (void (*func) (struct if_rmap *))
+{
+  if_rmap_delete_hook = func;
+}
+
+void *
+if_rmap_hash_alloc (struct if_rmap *arg)
+{
+  struct if_rmap *if_rmap;
+
+  if_rmap = if_rmap_new ();
+  if_rmap->ifname = strdup (arg->ifname);
+
+  return if_rmap;
+}
+
+struct if_rmap *
+if_rmap_get (char *ifname)
+{
+  struct if_rmap key;
+
+  key.ifname = ifname;
+
+  return (struct if_rmap *) hash_get (ifrmaphash, &key, if_rmap_hash_alloc);
+}
+
+unsigned int
+if_rmap_hash_make (struct if_rmap *if_rmap)
+{
+  unsigned int key;
+  int i;
+
+  key = 0;
+  for (i = 0; i < strlen (if_rmap->ifname); i++)
+    key += if_rmap->ifname[i];
+
+  return key;
+}
+
+int
+if_rmap_hash_cmp (struct if_rmap *if_rmap1, struct if_rmap *if_rmap2)
+{
+  if (strcmp (if_rmap1->ifname, if_rmap2->ifname) == 0)
+    return 1;
+  return 0;
+}
+
+struct if_rmap *
+if_rmap_set (char *ifname, enum if_rmap_type type, char *routemap_name)
+{
+  struct if_rmap *if_rmap;
+
+  if_rmap = if_rmap_get (ifname);
+
+  if (type == IF_RMAP_IN)
+    {
+      if (if_rmap->routemap[IF_RMAP_IN])
+	free (if_rmap->routemap[IF_RMAP_IN]);
+      if_rmap->routemap[IF_RMAP_IN] = strdup (routemap_name);
+    }
+  if (type == IF_RMAP_OUT)
+    {
+      if (if_rmap->routemap[IF_RMAP_OUT])
+	free (if_rmap->routemap[IF_RMAP_OUT]);
+      if_rmap->routemap[IF_RMAP_OUT] = strdup (routemap_name);
+    }
+
+  if (if_rmap_add_hook)
+    (*if_rmap_add_hook) (if_rmap);
+  
+  return if_rmap;
+}
+
+int
+if_rmap_unset (char *ifname, enum if_rmap_type type, char *routemap_name)
+{
+  struct if_rmap *if_rmap;
+
+  if_rmap = if_rmap_lookup (ifname);
+  if (!if_rmap)
+    return 0;
+
+  if (type == IF_RMAP_IN)
+    {
+      if (!if_rmap->routemap[IF_RMAP_IN])
+	return 0;
+      if (strcmp (if_rmap->routemap[IF_RMAP_IN], routemap_name) != 0)
+	return 0;
+
+      free (if_rmap->routemap[IF_RMAP_IN]);
+      if_rmap->routemap[IF_RMAP_IN] = NULL;      
+    }
+
+  if (type == IF_RMAP_OUT)
+    {
+      if (!if_rmap->routemap[IF_RMAP_OUT])
+	return 0;
+      if (strcmp (if_rmap->routemap[IF_RMAP_OUT], routemap_name) != 0)
+	return 0;
+
+      free (if_rmap->routemap[IF_RMAP_OUT]);
+      if_rmap->routemap[IF_RMAP_OUT] = NULL;      
+    }
+
+  if (if_rmap_delete_hook)
+    (*if_rmap_delete_hook) (if_rmap);
+
+  if (if_rmap->routemap[IF_RMAP_IN] == NULL &&
+      if_rmap->routemap[IF_RMAP_OUT] == NULL)
+    {
+      hash_release (ifrmaphash, if_rmap);
+      if_rmap_free (if_rmap);
+    }
+
+  return 1;
+}
+
+DEFUN (if_rmap,
+       if_rmap_cmd,
+       "route-map RMAP_NAME (in|out) IFNAME",
+       "Route map set\n"
+       "Route map name\n"
+       "Route map set for input filtering\n"
+       "Route map set for output filtering\n"
+       "Route map interface name\n")
+{
+  enum if_rmap_type type;
+  struct if_rmap *if_rmap;
+
+  if (strncmp (argv[1], "i", 1) == 0)
+    type = IF_RMAP_IN;
+  else if (strncmp (argv[1], "o", 1) == 0)
+    type = IF_RMAP_OUT;
+  else
+    {
+      vty_out (vty, "route-map direction must be [in|out]%s", VTY_NEWLINE);
+      return CMD_WARNING;
+    }
+
+  if_rmap = if_rmap_set (argv[2], type, argv[0]);
+
+  return CMD_SUCCESS;
+}       
+
+DEFUN (no_if_rmap,
+       no_if_rmap_cmd,
+       "no route-map ROUTEMAP_NAME (in|out) IFNAME",
+       NO_STR
+       "Route map unset\n"
+       "Route map name\n"
+       "Route map for input filtering\n"
+       "Route map for output filtering\n"
+       "Route map interface name\n")
+{
+  int ret;
+  enum if_rmap_type type;
+
+  if (strncmp (argv[1], "i", 1) == 0)
+    type = IF_RMAP_IN;
+  else if (strncmp (argv[1], "o", 1) == 0)
+    type = IF_RMAP_OUT;
+  else
+    {
+      vty_out (vty, "route-map direction must be [in|out]%s", VTY_NEWLINE);
+      return CMD_WARNING;
+    }
+
+  ret = if_rmap_unset (argv[2], type, argv[0]);
+  if (! ret)
+    {
+      vty_out (vty, "route-map doesn't exist%s", VTY_NEWLINE);
+      return CMD_WARNING;
+    }
+  return CMD_SUCCESS;
+}       
+
+/* Configuration write function. */
+int
+config_write_if_rmap (struct vty *vty)
+{
+  int i;
+  struct hash_backet *mp;
+  int write = 0;
+
+  for (i = 0; i < ifrmaphash->size; i++)
+    for (mp = ifrmaphash->index[i]; mp; mp = mp->next)
+      {
+	struct if_rmap *if_rmap;
+
+	if_rmap = mp->data;
+
+	if (if_rmap->routemap[IF_RMAP_IN])
+	  {
+	    vty_out (vty, " route-map %s in %s%s", 
+		     if_rmap->routemap[IF_RMAP_IN],
+		     if_rmap->ifname,
+		     VTY_NEWLINE);
+	    write++;
+	  }
+
+	if (if_rmap->routemap[IF_RMAP_OUT])
+	  {
+	    vty_out (vty, " route-map %s out %s%s", 
+		     if_rmap->routemap[IF_RMAP_OUT],
+		     if_rmap->ifname,
+		     VTY_NEWLINE);
+	    write++;
+	  }
+      }
+  return write;
+}
+
+void
+if_rmap_reset ()
+{
+  hash_clean (ifrmaphash, (void (*) (void *)) if_rmap_free);
+}
+
+void
+if_rmap_init (int node)
+{
+  ifrmaphash = hash_create (if_rmap_hash_make, if_rmap_hash_cmp);
+  if (node == RIPNG_NODE) {
+    install_element (RIPNG_NODE, &if_rmap_cmd);
+    install_element (RIPNG_NODE, &no_if_rmap_cmd);
+  }
+}