/* BGP Community 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.  */

/* Community-list deny and permit.  */
#define COMMUNITY_DENY                 0
#define COMMUNITY_PERMIT               1

/* Number and string based community-list name.  */
#define COMMUNITY_LIST_STRING          0
#define COMMUNITY_LIST_NUMBER          1

/* Community-list entry types.  */
#define COMMUNITY_LIST_STANDARD        0 /* Standard community-list.  */
#define COMMUNITY_LIST_EXPANDED        1 /* Expanded community-list.  */
#define COMMUNITY_LIST_AUTO            2 /* Automatically detected.  */
#define EXTCOMMUNITY_LIST_STANDARD     3 /* Standard extcommunity-list.  */
#define EXTCOMMUNITY_LIST_EXPANDED     4 /* Expanded extcommunity-list.  */
#define EXTCOMMUNITY_LIST_AUTO         5 /* Automatically detected.  */

/* Community-list.  */
struct community_list
{
  /* Name of the community-list.  */
  char *name;

  /* String or number.  */
  int sort;

  /* Link to upper list.  */
  struct community_list_list *parent;

  /* Linked list for other community-list.  */
  struct community_list *next;
  struct community_list *prev;

  /* Community-list entry in this community-list.  */
  struct community_entry *head;
  struct community_entry *tail;
};

/* Each entry in community-list.  */
struct community_entry
{
  struct community_entry *next;
  struct community_entry *prev;

  /* Permit or deny.  */
  u_char direct;

  /* Standard or expanded.  */
  u_char style;

  /* Any match.  */
  u_char any;

  /* Community structure.  */
  union
  {
    struct community *com;
    struct ecommunity *ecom;
  } u;

  /* Configuration string.  */
  char *config;

  /* Expanded community-list regular expression.  */
  regex_t *reg;
};

/* Linked list of community-list.  */
struct community_list_list
{
  struct community_list *head;
  struct community_list *tail;
};

/* Master structure of community-list and extcommunity-list.  */
struct community_list_master
{
  struct community_list_list num;
  struct community_list_list str;
};

/* Community-list handler.  community_list_init() returns this
   structure as handler.  */
struct community_list_handler
{
  /* Community-list.  */
  struct community_list_master community_list;

  /* Exteded community-list.  */
  struct community_list_master extcommunity_list;
};

/* Error code of community-list.  */
#define COMMUNITY_LIST_ERR_CANT_FIND_LIST        -1
#define COMMUNITY_LIST_ERR_MALFORMED_VAL         -2
#define COMMUNITY_LIST_ERR_STANDARD_CONFLICT     -3
#define COMMUNITY_LIST_ERR_EXPANDED_CONFLICT     -4

/* Handler.  */
extern struct community_list_handler *bgp_clist;

/* Prototypes.  */
struct community_list_handler *community_list_init ();

int community_list_set (struct community_list_handler *ch,
			char *name, char *str, int direct, int style);
int community_list_unset (struct community_list_handler *ch,
			  char *name, char *str, int direct, int style);
int extcommunity_list_set (struct community_list_handler *ch,
			   char *name, char *str, int direct, int style);
int extcommunity_list_unset (struct community_list_handler *ch,
			     char *name, char *str, int direct, int style);

struct community_list_master *
community_list_master_lookup (struct community_list_handler *, int);

struct community_list *
community_list_lookup (struct community_list_handler *, char *, int);

int community_list_match (struct community *, struct community_list *);
int community_list_exact_match (struct community *, struct community_list *);
struct community *
community_list_match_delete (struct community *,
			     struct community_list *);