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/*
 * OSPF ABR functions.
 * Copyright (C) 1999 Alex Zinin
 *
 * 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_OSPF_ABR_H
#define _ZEBRA_OSPF_ABR_H

#define OSPF_ABR_TASK_DELAY 	7

#define OSPF_AREA_RANGE_ADVERTISE	(1 << 0)
#define OSPF_AREA_RANGE_SUBSTITUTE	(1 << 1)

/* Area range. */
struct ospf_area_range
{
  /* Area range address. */
  struct in_addr addr;

  /* Area range masklen. */
  u_char masklen;

  /* Flags. */
  u_char flags;

  /* Number of more specific prefixes. */
  int specifics;

  /* Addr and masklen to substitute. */
  struct in_addr subst_addr;
  u_char subst_masklen;

  /* Range cost. */
  u_int32_t cost;

  /* Configured range cost. */
  u_int32_t cost_config;
#define OSPF_AREA_RANGE_COST_UNSPEC	-1U
};

/* Prototypes. */
extern struct ospf_area_range *ospf_area_range_lookup (struct ospf_area *,
						       struct prefix_ipv4 *);

extern struct ospf_area_range *ospf_some_area_range_match (struct prefix_ipv4
							   *);

extern struct ospf_area_range *ospf_area_range_lookup_next (struct ospf_area
							    *,
							    struct in_addr *,
							    int);

extern int ospf_area_range_set (struct ospf *, struct in_addr,
				struct prefix_ipv4 *, int);
extern int ospf_area_range_cost_set (struct ospf *, struct in_addr,
				     struct prefix_ipv4 *, u_int32_t);
extern int ospf_area_range_unset (struct ospf *, struct in_addr,
				  struct prefix_ipv4 *);
extern int ospf_area_range_substitute_set (struct ospf *, struct in_addr,
					   struct prefix_ipv4 *,
					   struct prefix_ipv4 *);
extern int ospf_area_range_substitute_unset (struct ospf *, struct in_addr,
					     struct prefix_ipv4 *);
extern struct ospf_area_range *ospf_area_range_match_any (struct ospf *,
							  struct prefix_ipv4
							  *);
extern int ospf_area_range_active (struct ospf_area_range *);
extern int ospf_act_bb_connection (struct ospf *);

extern void ospf_check_abr_status (struct ospf *);
extern void ospf_abr_task (struct ospf *);
extern void ospf_schedule_abr_task (struct ospf *);

extern void ospf_abr_announce_network_to_area (struct prefix_ipv4 *, 
                                               u_int32_t,
                                               struct ospf_area *);
#endif /* _ZEBRA_OSPF_ABR_H */