/*
 * Copyright (C) 2004 Yasuhiro Ohara
 *
 * 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 this program; see the file COPYING; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef OSPF6_ABR_H
#define OSPF6_ABR_H

/* for struct ospf6_route */
#include "ospf6_route.h"
/* for struct ospf6_prefix */
#include "ospf6_proto.h"

/* Debug option */
extern unsigned char conf_debug_ospf6_abr;
#define OSPF6_DEBUG_ABR_ON() (conf_debug_ospf6_abr = 1)
#define OSPF6_DEBUG_ABR_OFF() (conf_debug_ospf6_abr = 0)
#define IS_OSPF6_DEBUG_ABR (conf_debug_ospf6_abr)

/* Inter-Area-Prefix-LSA */
#define OSPF6_INTER_PREFIX_LSA_MIN_SIZE        4U /* w/o IPv6 prefix */
struct ospf6_inter_prefix_lsa {
	uint32_t metric;
	struct ospf6_prefix prefix;
};

/* Inter-Area-Router-LSA */
#define OSPF6_INTER_ROUTER_LSA_FIX_SIZE       12U
struct ospf6_inter_router_lsa {
	uint8_t mbz;
	uint8_t options[3];
	uint32_t metric;
	uint32_t router_id;
};

#define OSPF6_ABR_SUMMARY_METRIC(E) (ntohl ((E)->metric & htonl (0x00ffffff)))
#define OSPF6_ABR_SUMMARY_METRIC_SET(E, C)                                     \
	{                                                                      \
		(E)->metric &= htonl(0x00000000);                              \
		(E)->metric |= htonl(0x00ffffff) & htonl(C);                   \
	}

#define OSPF6_ABR_RANGE_CLEAR_COST(range) (range->path.cost = OSPF_AREA_RANGE_COST_UNSPEC)
#define IS_OSPF6_ABR(o) ((o)->flag & OSPF6_FLAG_ABR)

extern bool ospf6_check_and_set_router_abr(struct ospf6 *o);

extern void ospf6_abr_enable_area(struct ospf6_area *oa);
extern void ospf6_abr_disable_area(struct ospf6_area *oa);

extern int ospf6_abr_originate_summary_to_area(struct ospf6_route *route,
					       struct ospf6_area *area);
extern void ospf6_abr_originate_summary(struct ospf6_route *route,
					struct ospf6 *ospf6);
extern void ospf6_abr_examin_summary(struct ospf6_lsa *lsa,
				     struct ospf6_area *oa);
extern void ospf6_abr_defaults_to_stub(struct ospf6 *ospf6);
extern void ospf6_abr_examin_brouter(uint32_t router_id,
				     struct ospf6_route *route,
				     struct ospf6 *ospf6);
extern void ospf6_abr_reimport(struct ospf6_area *oa);
extern void ospf6_abr_reexport(struct ospf6_area *oa);
extern void ospf6_abr_range_reset_cost(struct ospf6 *ospf6);
extern void ospf6_abr_prefix_resummarize(struct ospf6 *ospf6);

extern int config_write_ospf6_debug_abr(struct vty *vty);
extern void install_element_ospf6_debug_abr(void);
extern int ospf6_abr_config_write(struct vty *vty);
extern void ospf6_abr_old_route_remove(struct ospf6_lsa *lsa,
				       struct ospf6_route *old,
				       struct ospf6_route_table *table);
extern void ospf6_abr_old_path_update(struct ospf6_route *old_route,
				      struct ospf6_route *route,
				      struct ospf6_route_table *table);
extern void ospf6_abr_init(void);
extern void ospf6_abr_reexport(struct ospf6_area *oa);
extern void ospf6_abr_range_update(struct ospf6_route *range,
				   struct ospf6 *ospf6);
extern void ospf6_abr_remove_unapproved_summaries(struct ospf6 *ospf6);

#endif /*OSPF6_ABR_H*/