Initial revision

1 files changed, 905 insertions, 0 deletions

diff --git a/bgpd/bgp_clist.c b/bgpd/bgp_clist.c
new file mode 100644
index 00000000..0b6a2e8c
--- /dev/null
+++ b/bgpd/bgp_clist.c
@@ -0,0 +1,905 @@
+/* BGP community-list and extcommunity-list.
+   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 "command.h"
+#include "prefix.h"
+#include "memory.h"
+
+#include "bgpd/bgpd.h"
+#include "bgpd/bgp_community.h"
+#include "bgpd/bgp_ecommunity.h"
+#include "bgpd/bgp_aspath.h"
+#include "bgpd/bgp_regex.h"
+#include "bgpd/bgp_clist.h"
+
+/* Lookup master structure for community-list or
+   extcommunity-list.  */
+struct community_list_master *
+community_list_master_lookup (struct community_list_handler *ch, int style)
+{
+  if (ch)
+    switch (style)
+      {
+      case COMMUNITY_LIST_STANDARD:
+      case COMMUNITY_LIST_EXPANDED:
+      case COMMUNITY_LIST_AUTO:
+	return &ch->community_list;
+	break;
+      case EXTCOMMUNITY_LIST_STANDARD:
+      case EXTCOMMUNITY_LIST_EXPANDED:
+      case EXTCOMMUNITY_LIST_AUTO:
+	return &ch->extcommunity_list;
+      }
+  return NULL;
+}
+
+/* Allocate a new community list entry.  */
+struct community_entry *
+community_entry_new ()
+{
+  struct community_entry *new;
+
+  new = XMALLOC (MTYPE_COMMUNITY_LIST_ENTRY, sizeof (struct community_entry));
+  memset (new, 0, sizeof (struct community_entry));
+  return new;
+}
+
+/* Free community list entry.  */
+void
+community_entry_free (struct community_entry *entry)
+{
+  switch (entry->style)
+    {
+    case COMMUNITY_LIST_STANDARD:
+      if (entry->u.com)
+	community_free (entry->u.com);
+      break;
+    case EXTCOMMUNITY_LIST_STANDARD:
+      /* In case of standard extcommunity-list, configuration string
+	 is made by ecommunity_ecom2str().  */
+      if (entry->config)
+	XFREE (MTYPE_ECOMMUNITY_STR, entry->config);
+      if (entry->u.ecom)
+	ecommunity_free (entry->u.ecom);
+      break;
+    case COMMUNITY_LIST_EXPANDED:
+    case EXTCOMMUNITY_LIST_EXPANDED:
+      if (entry->config)
+	XFREE (MTYPE_COMMUNITY_LIST_CONFIG, entry->config);
+      if (entry->reg)
+	bgp_regex_free (entry->reg);
+    default:
+      break;
+    }
+  XFREE (MTYPE_COMMUNITY_LIST_ENTRY, entry);
+}
+
+/* Allocate a new community-list.  */
+struct community_list *
+community_list_new ()
+{
+  struct community_list *new;
+
+  new = XMALLOC (MTYPE_COMMUNITY_LIST, sizeof (struct community_list));
+  memset (new, 0, sizeof (struct community_list));
+  return new;
+}
+
+/* Free community-list.  */
+void
+community_list_free (struct community_list *list)
+{
+  if (list->name)
+    XFREE (MTYPE_COMMUNITY_LIST_NAME, list->name);
+  XFREE (MTYPE_COMMUNITY_LIST, list);
+}
+
+struct community_list *
+community_list_insert (struct community_list_handler *ch,
+		       char *name, int style)
+{
+  int i;
+  long number;
+  struct community_list *new;
+  struct community_list *point;
+  struct community_list_list *list;
+  struct community_list_master *cm;
+
+  /* Lookup community-list master.  */
+  cm = community_list_master_lookup (ch, style);
+  if (! cm)
+    return NULL;
+
+  /* Allocate new community_list and copy given name. */
+  new = community_list_new ();
+  new->name = XSTRDUP (MTYPE_COMMUNITY_LIST_NAME, name);
+
+  /* If name is made by all digit character.  We treat it as
+     number. */
+  for (number = 0, i = 0; i < strlen (name); i++)
+    {
+      if (isdigit ((int) name[i]))
+	number = (number * 10) + (name[i] - '0');
+      else
+	break;
+    }
+
+  /* In case of name is all digit character */
+  if (i == strlen (name))
+    {
+      new->sort = COMMUNITY_LIST_NUMBER;
+
+      /* Set access_list to number list. */
+      list = &cm->num;
+
+      for (point = list->head; point; point = point->next)
+	if (atol (point->name) >= number)
+	  break;
+    }
+  else
+    {
+      new->sort = COMMUNITY_LIST_STRING;
+
+      /* Set access_list to string list. */
+      list = &cm->str;
+  
+      /* Set point to insertion point. */
+      for (point = list->head; point; point = point->next)
+	if (strcmp (point->name, name) >= 0)
+	  break;
+    }
+
+  /* Link to upper list.  */
+  new->parent = list;
+
+  /* In case of this is the first element of master. */
+  if (list->head == NULL)
+    {
+      list->head = list->tail = new;
+      return new;
+    }
+
+  /* In case of insertion is made at the tail of access_list. */
+  if (point == NULL)
+    {
+      new->prev = list->tail;
+      list->tail->next = new;
+      list->tail = new;
+      return new;
+    }
+
+  /* In case of insertion is made at the head of access_list. */
+  if (point == list->head)
+    {
+      new->next = list->head;
+      list->head->prev = new;
+      list->head = new;
+      return new;
+    }
+
+  /* Insertion is made at middle of the access_list. */
+  new->next = point;
+  new->prev = point->prev;
+
+  if (point->prev)
+    point->prev->next = new;
+  point->prev = new;
+
+  return new;
+}
+
+struct community_list *
+community_list_lookup (struct community_list_handler *ch,
+		       char *name, int style)
+{
+  struct community_list *list;
+  struct community_list_master *cm;
+
+  if (! name)
+    return NULL;
+
+  cm = community_list_master_lookup (ch, style);
+  if (! cm)
+    return NULL;
+
+  for (list = cm->num.head; list; list = list->next)
+    if (strcmp (list->name, name) == 0)
+      return list;
+  for (list = cm->str.head; list; list = list->next)
+    if (strcmp (list->name, name) == 0)
+      return list;
+
+  return NULL;
+}
+
+struct community_list *
+community_list_get (struct community_list_handler *ch, char *name, int style)
+{
+  struct community_list *list;
+
+  list = community_list_lookup (ch, name, style);
+  if (! list)
+    list = community_list_insert (ch, name, style);
+  return list;
+}
+
+void
+community_list_delete (struct community_list *list)
+{
+  struct community_list_list *clist;
+  struct community_entry *entry, *next;
+
+  for (entry = list->head; entry; entry = next)
+    {
+      next = entry->next;
+      community_entry_free (entry);
+    }
+
+  clist = list->parent;
+
+  if (list->next)
+    list->next->prev = list->prev;
+  else
+    clist->tail = list->prev;
+
+  if (list->prev)
+    list->prev->next = list->next;
+  else
+    clist->head = list->next;
+
+  community_list_free (list);
+}
+
+int 
+community_list_empty_p (struct community_list *list)
+{
+  return (list->head == NULL && list->tail == NULL) ? 1 : 0;
+}
+
+/* Add community-list entry to the list.  */
+static void
+community_list_entry_add (struct community_list *list, 
+			  struct community_entry *entry)
+{
+  entry->next = NULL;
+  entry->prev = list->tail;
+
+  if (list->tail)
+    list->tail->next = entry;
+  else
+    list->head = entry;
+  list->tail = entry;
+}
+
+/* Delete community-list entry from the list.  */
+static void
+community_list_entry_delete (struct community_list *list,
+			     struct community_entry *entry, int style)
+{
+  if (entry->next)
+    entry->next->prev = entry->prev;
+  else
+    list->tail = entry->prev;
+
+  if (entry->prev)
+    entry->prev->next = entry->next;
+  else
+    list->head = entry->next;
+
+  community_entry_free (entry);
+
+  if (community_list_empty_p (list))
+    community_list_delete (list);
+}
+
+/* Lookup community-list entry from the list.  */
+static struct community_entry *
+community_list_entry_lookup (struct community_list *list, void *arg,
+			     int direct)
+{
+  struct community_entry *entry;
+
+  for (entry = list->head; entry; entry = entry->next)
+    {
+      switch (entry->style)
+	{
+	case COMMUNITY_LIST_STANDARD:
+	  if (community_cmp (entry->u.com, arg))
+	    return entry;
+	  break;
+	case EXTCOMMUNITY_LIST_STANDARD:
+	  if (ecommunity_cmp (entry->u.ecom, arg))
+	    return entry;
+	  break;
+	case COMMUNITY_LIST_EXPANDED:
+	case EXTCOMMUNITY_LIST_EXPANDED:
+	  if (strcmp (entry->config, arg) == 0)
+	    return entry;
+	  break;
+	default:
+	  break;
+	}
+    }
+  return NULL;
+}
+
+/* Internal function to perform regular expression match for community
+   attribute.  */
+static int
+community_regexp_match (struct community *com, regex_t *reg)
+{
+  char *str;
+
+  /* When there is no communities attribute it is treated as empty
+     string.  */
+  if (com == NULL || com->size == 0)
+    str = "";
+  else
+    str = community_str (com);
+
+  /* Regular expression match.  */
+  if (regexec (reg, str, 0, NULL, 0) == 0)
+    return 1;
+
+  /* No match.  */
+  return 0;
+}
+
+/* Delete community attribute using regular expression match.  Return
+   modified communites attribute.  */
+static struct community *
+community_regexp_delete (struct community *com, regex_t *reg)
+{
+  int i;
+  u_int32_t comval;
+  /* Maximum is "65535:65535" + '\0'. */
+  char c[12];
+  char *str;
+
+  if (! com)
+    return NULL;
+
+  i = 0;
+  while (i < com->size)
+    {
+      memcpy (&comval, com_nthval (com, i), sizeof (u_int32_t));
+      comval = ntohl (comval);
+
+      switch (comval)
+	{
+	case COMMUNITY_INTERNET:
+	  str = "internet";
+	  break;
+	case COMMUNITY_NO_EXPORT:
+	  str = "no-export";
+	  break;
+	case COMMUNITY_NO_ADVERTISE:
+	  str = "no-advertise";
+	  break;
+	case COMMUNITY_LOCAL_AS:
+	  str = "local-AS";
+	  break;
+	default:
+	  sprintf (c, "%d:%d", (comval >> 16) & 0xFFFF, comval & 0xFFFF);
+	  str = c;
+	  break;
+	}
+
+      if (regexec (reg, str, 0, NULL, 0) == 0)
+	community_del_val (com, com_nthval (com, i));
+      else
+	i++;
+    }
+  return com;
+}
+
+/* When given community attribute matches to the community-list return
+   1 else return 0.  */
+int
+community_list_match (struct community *com, struct community_list *list)
+{
+  struct community_entry *entry;
+
+  for (entry = list->head; entry; entry = entry->next)
+    {
+      if (entry->any)
+	return entry->direct == COMMUNITY_PERMIT ? 1 : 0;
+
+      if (entry->style == COMMUNITY_LIST_STANDARD)
+	{
+	  if (community_include (entry->u.com, COMMUNITY_INTERNET))
+	    return entry->direct == COMMUNITY_PERMIT ? 1 : 0;
+
+	  if (community_match (com, entry->u.com))
+	    return entry->direct == COMMUNITY_PERMIT ? 1 : 0;
+	}
+      else if (entry->style == COMMUNITY_LIST_EXPANDED)
+	{
+	  if (community_regexp_match (com, entry->reg))
+	    return entry->direct == COMMUNITY_PERMIT ? 1 : 0;
+	}
+    }
+  return 0;
+}
+
+/* Perform exact matching.  In case of expanded community-list, do
+   same thing as community_list_match().  */
+int
+community_list_exact_match (struct community *com, struct community_list *list)
+{
+  struct community_entry *entry;
+
+  for (entry = list->head; entry; entry = entry->next)
+    {
+      if (entry->any)
+	return entry->direct == COMMUNITY_PERMIT ? 1 : 0;
+
+      if (entry->style == COMMUNITY_LIST_STANDARD)
+	{
+	  if (community_include (entry->u.com, COMMUNITY_INTERNET))
+	    return entry->direct == COMMUNITY_PERMIT ? 1 : 0;
+
+	  if (community_cmp (com, entry->u.com))
+	    return entry->direct == COMMUNITY_PERMIT ? 1 : 0;
+	}
+      else if (entry->style == COMMUNITY_LIST_EXPANDED)
+	{
+	  if (community_regexp_match (com, entry->reg))
+	    return entry->direct == COMMUNITY_PERMIT ? 1 : 0;
+	}
+    }
+  return 0;
+}
+
+/* Delete all permitted communities in the list from com1 */
+struct community *
+community_list_match_delete (struct community *com,
+			     struct community_list *list)
+{
+  struct community_entry *entry;
+
+  for (entry = list->head; entry; entry = entry->next)
+    {
+      if (entry->any && entry->direct == COMMUNITY_PERMIT)
+	{
+	  /* This is a tricky part.  Currently only
+	     route_set_community_delete() uses this function.  In the
+	     function com->size is zero, it free the community
+	     structure.  */
+	  com->size = 0;
+	  return com;
+	}
+
+      if (entry->style == COMMUNITY_LIST_STANDARD)
+	{
+	  if (entry->direct == COMMUNITY_PERMIT)
+	    community_delete (com, entry->u.com);
+	}
+      else if (entry->style == COMMUNITY_LIST_EXPANDED)
+	{
+	  if (entry->direct == COMMUNITY_PERMIT)
+	    community_regexp_delete (com, entry->reg);
+	}
+    }
+  return com;
+}
+
+/* To avoid duplicated entry in the community-list, this function
+   compares specified entry to existing entry.  */
+int
+community_list_dup_check (struct community_list *list, 
+			  struct community_entry *new)
+{
+  struct community_entry *entry;
+  
+  for (entry = list->head; entry; entry = entry->next)
+    {
+      if (entry->style != new->style)
+	continue;
+
+      if (entry->direct != new->direct)
+	continue;
+
+      if (entry->any != new->any)
+	continue;
+
+      if (entry->any)
+	return 1;
+
+      switch (entry->style)
+	{
+	case COMMUNITY_LIST_STANDARD:
+	  if (community_cmp (entry->u.com, new->u.com))
+	    return 1;
+	  break;
+	case EXTCOMMUNITY_LIST_STANDARD:
+	  if (ecommunity_cmp (entry->u.ecom, new->u.ecom))
+	    return 1;
+	  break;
+	case COMMUNITY_LIST_EXPANDED:
+	case EXTCOMMUNITY_LIST_EXPANDED:
+	  if (strcmp (entry->config, new->config) == 0)
+	    return 1;
+	  break;
+	default:
+	  break;
+	}
+    }
+  return 0;
+}
+
+/* Set community-list.  */
+int
+community_list_set (struct community_list_handler *ch,
+		    char *name, char *str, int direct, int style)
+{
+  struct community_entry *entry;
+  struct community_list *list;
+  struct community *com;
+  regex_t *regex;
+
+  entry = NULL;
+
+  /* Get community list. */
+  list = community_list_get (ch, name, style);
+
+  /* When community-list already has entry, new entry should have same
+     style.  If you want to have mixed style community-list, you can
+     comment out this check.  */
+  if (! community_list_empty_p (list))
+    {
+      struct community_entry *first;
+
+      first = list->head;
+
+      if (style == COMMUNITY_LIST_AUTO)
+	style = first->style;
+      else if (style != first->style)
+	{
+	  return (first->style == COMMUNITY_LIST_STANDARD
+		  ? COMMUNITY_LIST_ERR_STANDARD_CONFLICT
+		  : COMMUNITY_LIST_ERR_EXPANDED_CONFLICT);
+	}
+    }
+
+  /* When str is NULL, it is matches any.  */
+  if (! str)
+    {
+      entry = community_entry_new ();
+      entry->direct = direct;
+      entry->any = 1;
+      if (style == COMMUNITY_LIST_AUTO)
+	entry->style = COMMUNITY_LIST_STANDARD;
+      else
+	entry->style = style;
+    }
+  else
+    {
+      /* Standard community-list parse.  String must be converted into
+	 community structure without problem.  */
+      if (style == COMMUNITY_LIST_STANDARD || style == COMMUNITY_LIST_AUTO)
+	{
+	  com = community_str2com (str);
+	  if (com)
+	    {
+	      entry = community_entry_new ();
+	      entry->u.com = com;
+	      entry->direct = direct;
+	      entry->style = COMMUNITY_LIST_STANDARD;
+	    }
+	  else if (style == COMMUNITY_LIST_STANDARD)
+	    return COMMUNITY_LIST_ERR_MALFORMED_VAL;
+	  
+	  /* We can't convert string into communities value.  When
+	     community-list type is auto, fall dawn to regular expression
+	     match.  */
+	}
+
+      /* Expanded community-list parse.  String may include regular
+	 expression.  */
+      if (! entry && (style == COMMUNITY_LIST_EXPANDED
+		      || style == COMMUNITY_LIST_AUTO))
+	{
+	  regex = bgp_regcomp (str);
+	  if (regex)
+	    {
+	      entry = community_entry_new ();
+	      entry->reg = regex;
+	      entry->config = XSTRDUP (MTYPE_COMMUNITY_LIST_CONFIG, str);
+	      entry->direct = direct;
+	      entry->style = COMMUNITY_LIST_EXPANDED;
+	    }
+	  else
+	    return COMMUNITY_LIST_ERR_MALFORMED_VAL;
+	}
+    }
+
+  /* Do not put duplicated community entry.  */
+  if (community_list_dup_check (list, entry))
+    community_entry_free (entry);
+  else
+    community_list_entry_add (list, entry);
+
+  return 0;
+}
+
+/* Unset community-list.  When str is NULL, delete all of
+   community-list entry belongs to the specified name.  */
+int
+community_list_unset (struct community_list_handler *ch,
+		      char *name, char *str, int direct, int style)
+{
+  struct community_entry *entry;
+  struct community_list *list;
+  struct community *com;
+  regex_t *regex;
+
+  entry = NULL;
+
+  /* Lookup community list.  */
+  list = community_list_lookup (ch, name, style);
+  if (list == NULL)
+    return COMMUNITY_LIST_ERR_CANT_FIND_LIST;
+
+  /* Delete all of entry belongs to this community-list.  */
+  if (! str)
+    {
+      community_list_delete (list);
+      return 0;
+    }
+
+  /* Community list string is specified.  Lookup entry from community
+     list.  */
+  if (style == COMMUNITY_LIST_STANDARD || style == COMMUNITY_LIST_AUTO)
+    {
+      com = community_str2com (str);
+      if (com)
+	{
+	  entry = community_list_entry_lookup (list, com, direct);
+	  community_free (com);
+	}
+      else if (style == COMMUNITY_LIST_STANDARD)
+	return COMMUNITY_LIST_ERR_MALFORMED_VAL;
+
+      /* If we can't convert string into community and community-list
+	 type is auto, fall dawn to expanded community-list.  */
+    }
+
+  /* Expanded community-list parse.  String may include regular
+     expression.  */
+  if (! entry 
+      && (style == COMMUNITY_LIST_EXPANDED || style == COMMUNITY_LIST_AUTO))
+    {
+      regex = bgp_regcomp (str);
+      if (regex)
+	{
+	  entry = community_list_entry_lookup (list, str, direct);
+	  bgp_regex_free (regex);
+	}
+      else
+	return COMMUNITY_LIST_ERR_MALFORMED_VAL;
+    }
+
+  if (! entry)
+    return COMMUNITY_LIST_ERR_CANT_FIND_LIST;
+
+  community_list_entry_delete (list, entry, style);
+
+  return 0;
+}
+
+/* Set extcommunity-list.  */
+int
+extcommunity_list_set (struct community_list_handler *ch,
+		       char *name, char *str, int direct, int style)
+{
+  struct community_entry *entry;
+  struct community_list *list;
+  struct ecommunity *ecom;
+  regex_t *regex;
+
+  entry = NULL;
+
+  /* Get community list. */
+  list = community_list_get (ch, name, style);
+
+  /* When community-list already has entry, new entry should have same
+     style.  If you want to have mixed style community-list, you can
+     comment out this check.  */
+  if (! community_list_empty_p (list))
+    {
+      struct community_entry *first;
+
+      first = list->head;
+
+      if (style == EXTCOMMUNITY_LIST_AUTO)
+	style = first->style;
+      else if (style != first->style)
+	{
+	  return (first->style == EXTCOMMUNITY_LIST_STANDARD
+		  ? COMMUNITY_LIST_ERR_STANDARD_CONFLICT
+		  : COMMUNITY_LIST_ERR_EXPANDED_CONFLICT);
+	}
+    }
+
+  /* When str is NULL, it is matches any.  */
+  if (! str)
+    {
+      entry = community_entry_new ();
+      entry->direct = direct;
+      entry->any = 1;
+      if (style == EXTCOMMUNITY_LIST_AUTO)
+	entry->style = EXTCOMMUNITY_LIST_STANDARD;
+      else
+	entry->style = style;
+    }
+  else
+    {
+      /* Standard extcommunity-list parse.  String is converted into
+	 ecommunity structure.  */
+      if (style == EXTCOMMUNITY_LIST_STANDARD
+	  || style == EXTCOMMUNITY_LIST_AUTO)
+	{
+	  /* Type is unknown.  String includes keyword.  */
+	  ecom = ecommunity_str2com (str, 0, 1);
+	  if (ecom)
+	    {
+	      entry = community_entry_new ();
+	      entry->config 
+		= ecommunity_ecom2str (ecom, ECOMMUNITY_FORMAT_COMMUNITY_LIST);
+	      ecom->str = ecommunity_ecom2str (ecom, ECOMMUNITY_FORMAT_DISPLAY);
+	      entry->u.ecom = ecom;
+	      entry->direct = direct;
+	      entry->style = EXTCOMMUNITY_LIST_STANDARD;
+	    }
+	  else if (style == EXTCOMMUNITY_LIST_STANDARD)
+	    return COMMUNITY_LIST_ERR_MALFORMED_VAL;
+
+	  /* We can't convert string into communities value.  When
+	     community-list type is auto, fall dawn to regular expression
+	     match.  */
+	}
+
+      /* Expanded extcommunity-list parse.  String may include regular
+	 expression.  */
+      if (! entry && (style == EXTCOMMUNITY_LIST_EXPANDED
+		      || style == EXTCOMMUNITY_LIST_AUTO))
+	{
+	  regex = bgp_regcomp (str);
+	  if (regex)
+	    {
+	      entry = community_entry_new ();
+	      entry->reg = regex;
+	      entry->config = XSTRDUP (MTYPE_COMMUNITY_LIST_CONFIG, str);
+	      entry->direct = direct;
+	      entry->style = EXTCOMMUNITY_LIST_EXPANDED;
+	    }
+	  else
+	    return COMMUNITY_LIST_ERR_MALFORMED_VAL;
+	}
+    }
+
+  /* Do not put duplicated community entry.  */
+  if (community_list_dup_check (list, entry))
+    community_entry_free (entry);
+  else
+    community_list_entry_add (list, entry);
+
+  return 0;
+}
+
+/* Unset extcommunity-list.  When str is NULL, delete all of
+   extcommunity-list entry belongs to the specified name.  */
+int
+extcommunity_list_unset (struct community_list_handler *ch,
+			 char *name, char *str, int direct, int style)
+{
+  struct community_entry *entry;
+  struct community_list *list;
+  struct ecommunity *ecom = NULL;
+  regex_t *regex;
+
+  entry = NULL;
+
+  /* Lookup extcommunity list.  */
+  list = community_list_lookup (ch, name, style);
+  if (list == NULL)
+    return COMMUNITY_LIST_ERR_CANT_FIND_LIST;
+
+  /* Delete all of entry belongs to this extcommunity-list.  */
+  if (! str)
+    {
+      community_list_delete (list);
+      return 0;
+    }
+
+  /* Community list string is specified.  Lookup entry from community
+     list.  */
+  if (style == EXTCOMMUNITY_LIST_STANDARD || style == EXTCOMMUNITY_LIST_AUTO)
+    {
+      ecom = ecommunity_str2com (str, 0, 1);
+      if (ecom)
+	{
+	  entry = community_list_entry_lookup (list, ecom, direct);
+	  ecommunity_free (ecom);
+	}
+      else if (style == COMMUNITY_LIST_STANDARD)
+	return COMMUNITY_LIST_ERR_MALFORMED_VAL;
+
+      /* If we can't convert string into community and community-list
+	 type is auto, fall dawn to expanded community-list.  */
+    }
+
+  /* Expanded community-list parse.  String may include regular
+     expression.  */
+  if (! entry 
+      && (style == COMMUNITY_LIST_EXPANDED || style == COMMUNITY_LIST_AUTO))
+    {
+      regex = bgp_regcomp (str);
+      if (regex)
+	{
+	  entry = community_list_entry_lookup (list, str, direct);
+	  bgp_regex_free (regex);
+	}
+      else
+	return COMMUNITY_LIST_ERR_MALFORMED_VAL;
+    }
+
+  if (! entry)
+    return COMMUNITY_LIST_ERR_CANT_FIND_LIST;
+
+  community_list_entry_delete (list, entry, style);
+
+  return 0;
+}
+
+/* Initializa community-list.  Return community-list handler.  */
+struct community_list_handler *
+community_list_init ()
+{
+  struct community_list_handler *ch;
+  ch = XCALLOC (MTYPE_COMMUNITY_LIST_HANDLER,
+		sizeof (struct community_list_handler));
+  return ch;
+}
+
+/* Terminate community-list.  */
+void
+community_list_terminate (struct community_list_handler *ch)
+{
+  struct community_list_master *cm;
+  struct community_list *list;
+
+  cm = &ch->community_list;
+  while ((list = cm->num.head) != NULL)
+    community_list_delete (list);
+  while ((list = cm->str.head) != NULL)
+    community_list_delete (list);
+
+  cm = &ch->extcommunity_list;
+  while ((list = cm->num.head) != NULL)
+    community_list_delete (list);
+  while ((list = cm->str.head) != NULL)
+    community_list_delete (list);
+
+  XFREE (MTYPE_COMMUNITY_LIST_HANDLER, ch);
+}