[mirror_frr.git] / ospfd / ospf_lsa.h

/*
 * OSPF Link State Advertisement
 * Copyright (C) 1999, 2000 Toshiaki Takada
 *
 * 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 _ZEBRA_OSPF_LSA_H
#define _ZEBRA_OSPF_LSA_H

#include "stream.h"

/* OSPF LSA Default metric values */
#define DEFAULT_DEFAULT_METRIC 20
#define DEFAULT_DEFAULT_ORIGINATE_METRIC 10
#define DEFAULT_DEFAULT_ALWAYS_METRIC 1
#define DEFAULT_METRIC_TYPE EXTERNAL_METRIC_TYPE_2

/* OSPF LSA Range definition. */
#define OSPF_MIN_LSA		1  /* begin range here */
#define OSPF_MAX_LSA           12

/* OSPF LSA Type definition. */
#define OSPF_UNKNOWN_LSA	      0
#define OSPF_ROUTER_LSA               1
#define OSPF_NETWORK_LSA              2
#define OSPF_SUMMARY_LSA              3
#define OSPF_ASBR_SUMMARY_LSA         4
#define OSPF_AS_EXTERNAL_LSA          5
#define OSPF_GROUP_MEMBER_LSA	      6  /* Not supported. */
#define OSPF_AS_NSSA_LSA	              7
#define OSPF_EXTERNAL_ATTRIBUTES_LSA  8  /* Not supported. */
#define OSPF_OPAQUE_LINK_LSA	      9
#define OSPF_OPAQUE_AREA_LSA	     10
#define OSPF_OPAQUE_AS_LSA	     11

#define OSPF_LSA_HEADER_SIZE	     20U
#define OSPF_ROUTER_LSA_LINK_SIZE    12U
#define OSPF_ROUTER_LSA_TOS_SIZE      4U
#define OSPF_MAX_LSA_SIZE	   1500U

/* AS-external-LSA refresh method. */
#define LSA_REFRESH_IF_CHANGED	0
#define LSA_REFRESH_FORCE	1

/* OSPF LSA header. */
struct lsa_header {
	uint16_t ls_age;
	uint8_t options;
	uint8_t type;
	struct in_addr id;
	struct in_addr adv_router;
	uint32_t ls_seqnum;
	uint16_t checksum;
	uint16_t length;
};

struct vertex;

/* OSPF LSA. */
struct ospf_lsa {
	/* LSA origination flag. */
	uint8_t flags;
#define OSPF_LSA_SELF		  0x01
#define OSPF_LSA_SELF_CHECKED	  0x02
#define OSPF_LSA_RECEIVED	  0x04
#define OSPF_LSA_APPROVED	  0x08
#define OSPF_LSA_DISCARD	  0x10
#define OSPF_LSA_LOCAL_XLT	  0x20
#define OSPF_LSA_PREMATURE_AGE	  0x40
#define OSPF_LSA_IN_MAXAGE	  0x80

	/* LSA data. */
	struct lsa_header *data;

	/* Received time stamp. */
	struct timeval tv_recv;

	/* Last time it was originated */
	struct timeval tv_orig;

	/* All of reference count, also lock to remove. */
	int lock;

	/* Flags for the SPF calculation. */
	struct vertex *stat;

	/* References to this LSA in neighbor retransmission lists*/
	int retransmit_counter;

	/* Area the LSA belongs to, may be NULL if AS-external-LSA. */
	struct ospf_area *area;

	/* Parent LSDB. */
	struct ospf_lsdb *lsdb;

	/* Related Route. */
	void *route;

	/* Refreshement List or Queue */
	int refresh_list;

	/* For Type-9 Opaque-LSAs */
	struct ospf_interface *oi;

	/* VRF Id */
	vrf_id_t vrf_id;
};

/* OSPF LSA Link Type. */
#define LSA_LINK_TYPE_POINTOPOINT      1
#define LSA_LINK_TYPE_TRANSIT          2
#define LSA_LINK_TYPE_STUB             3
#define LSA_LINK_TYPE_VIRTUALLINK      4

/* OSPF Router LSA Flag. */
#define ROUTER_LSA_BORDER	       0x01 /* The router is an ABR */
#define ROUTER_LSA_EXTERNAL	       0x02 /* The router is an ASBR */
#define ROUTER_LSA_VIRTUAL	       0x04 /* The router has a VL in this area */
#define ROUTER_LSA_NT		       0x10 /* The routers always translates Type-7 */
#define ROUTER_LSA_SHORTCUT	       0x20 /* Shortcut-ABR specific flag */

#define IS_ROUTER_LSA_VIRTUAL(x)       ((x)->flags & ROUTER_LSA_VIRTUAL)
#define IS_ROUTER_LSA_EXTERNAL(x)      ((x)->flags & ROUTER_LSA_EXTERNAL)
#define IS_ROUTER_LSA_BORDER(x)	       ((x)->flags & ROUTER_LSA_BORDER)
#define IS_ROUTER_LSA_SHORTCUT(x)      ((x)->flags & ROUTER_LSA_SHORTCUT)
#define IS_ROUTER_LSA_NT(x)            ((x)->flags & ROUTER_LSA_NT)

/* OSPF Router-LSA Link information. */
struct router_lsa_link {
	struct in_addr link_id;
	struct in_addr link_data;
	struct {
		uint8_t type;
		uint8_t tos_count;
		uint16_t metric;
	} m[1];
};

/* OSPF Router-LSAs structure. */
#define OSPF_ROUTER_LSA_MIN_SIZE                   4U /* w/0 link descriptors */
/* There is an edge case, when number of links in a Router-LSA may be 0 without
   breaking the specification. A router, which has no other links to backbone
   area besides one virtual link, will not put any VL descriptor blocks into
   the Router-LSA generated for area 0 until a full adjacency over the VL is
   reached (RFC2328 12.4.1.3). In this case the Router-LSA initially received
   by the other end of the VL will have 0 link descriptor blocks, but soon will
   be replaced with the next revision having 1 descriptor block. */
struct router_lsa {
	struct lsa_header header;
	uint8_t flags;
	uint8_t zero;
	uint16_t links;
	struct {
		struct in_addr link_id;
		struct in_addr link_data;
		uint8_t type;
		uint8_t tos;
		uint16_t metric;
	} link[1];
};

/* OSPF Network-LSAs structure. */
#define OSPF_NETWORK_LSA_MIN_SIZE                  8U /* w/1 router-ID */
struct network_lsa {
	struct lsa_header header;
	struct in_addr mask;
	struct in_addr routers[1];
};

/* OSPF Summary-LSAs structure. */
#define OSPF_SUMMARY_LSA_MIN_SIZE                  8U /* w/1 TOS metric block */
struct summary_lsa {
	struct lsa_header header;
	struct in_addr mask;
	uint8_t tos;
	uint8_t metric[3];
};

/* OSPF AS-external-LSAs structure. */
#define OSPF_AS_EXTERNAL_LSA_MIN_SIZE             16U /* w/1 TOS forwarding block */
struct as_external_lsa {
	struct lsa_header header;
	struct in_addr mask;
	struct {
		uint8_t tos;
		uint8_t metric[3];
		struct in_addr fwd_addr;
		uint32_t route_tag;
	} e[1];
};

#include "ospfd/ospf_opaque.h"

/* Macros. */
#define GET_METRIC(x) get_metric(x)
#define IS_EXTERNAL_METRIC(x)   ((x) & 0x80)

#define GET_AGE(x)     (ntohs ((x)->data->ls_age) + time (NULL) - (x)->tv_recv)
#define LS_AGE(x) (OSPF_LSA_MAXAGE < get_age(x) ? OSPF_LSA_MAXAGE : get_age(x))
#define IS_LSA_SELF(L)          (CHECK_FLAG ((L)->flags, OSPF_LSA_SELF))
#define IS_LSA_MAXAGE(L)        (LS_AGE ((L)) == OSPF_LSA_MAXAGE)

#define OSPF_LSA_UPDATE_DELAY		2

#define OSPF_LSA_UPDATE_TIMER_ON(T, F)                                         \
	if (!(T))                                                              \
	(T) = thread_add_timer(master, (F), 0, 2)

/* Prototypes. */
/* XXX: Eek, time functions, similar are in lib/thread.c */
extern struct timeval int2tv(int);
extern struct timeval msec2tv(int);

extern int get_age(struct ospf_lsa *);
extern uint16_t ospf_lsa_checksum(struct lsa_header *);
extern int ospf_lsa_checksum_valid(struct lsa_header *);
extern int ospf_lsa_refresh_delay(struct ospf_lsa *);

extern const char *dump_lsa_key(struct ospf_lsa *);
extern uint32_t lsa_seqnum_increment(struct ospf_lsa *);
extern void lsa_header_set(struct stream *, uint8_t, uint8_t, struct in_addr,
			   struct in_addr);
extern struct ospf_neighbor *ospf_nbr_lookup_ptop(struct ospf_interface *);
extern int ospf_check_nbr_status(struct ospf *);

/* Prototype for LSA primitive. */
extern struct ospf_lsa *ospf_lsa_new(void);
extern struct ospf_lsa *ospf_lsa_new_and_data(size_t size);
extern struct ospf_lsa *ospf_lsa_dup(struct ospf_lsa *);
extern void ospf_lsa_free(struct ospf_lsa *);
extern struct ospf_lsa *ospf_lsa_lock(struct ospf_lsa *);
extern void ospf_lsa_unlock(struct ospf_lsa **);
extern void ospf_lsa_discard(struct ospf_lsa *);
extern int ospf_lsa_flush_schedule(struct ospf *, struct ospf_lsa *);
extern struct lsa_header *ospf_lsa_data_new(size_t);
extern struct lsa_header *ospf_lsa_data_dup(struct lsa_header *);
extern void ospf_lsa_data_free(struct lsa_header *);

/* Prototype for various LSAs */
extern int ospf_router_lsa_update(struct ospf *);
extern int ospf_router_lsa_update_area(struct ospf_area *);

extern void ospf_network_lsa_update(struct ospf_interface *);

extern struct ospf_lsa *
ospf_summary_lsa_originate(struct prefix_ipv4 *, uint32_t, struct ospf_area *);
extern struct ospf_lsa *ospf_summary_asbr_lsa_originate(struct prefix_ipv4 *,
							uint32_t,
							struct ospf_area *);

extern struct ospf_lsa *ospf_lsa_install(struct ospf *, struct ospf_interface *,
					 struct ospf_lsa *);

extern void ospf_nssa_lsa_flush(struct ospf *ospf, struct prefix_ipv4 *p);
extern void ospf_external_lsa_flush(struct ospf *, uint8_t,
				    struct prefix_ipv4 *,
				    ifindex_t /* , struct in_addr nexthop */);

extern struct in_addr ospf_get_ip_from_ifp(struct ospf_interface *);

extern struct ospf_lsa *ospf_external_lsa_originate(struct ospf *,
						    struct external_info *);
extern void ospf_external_lsa_rid_change(struct ospf *ospf);
extern struct ospf_lsa *ospf_lsa_lookup(struct ospf *ospf, struct ospf_area *,
					uint32_t, struct in_addr,
					struct in_addr);
extern struct ospf_lsa *ospf_lsa_lookup_by_id(struct ospf_area *, uint32_t,
					      struct in_addr);
extern struct ospf_lsa *ospf_lsa_lookup_by_header(struct ospf_area *,
						  struct lsa_header *);
extern int ospf_lsa_more_recent(struct ospf_lsa *, struct ospf_lsa *);
extern int ospf_lsa_different(struct ospf_lsa *, struct ospf_lsa *);
extern void ospf_flush_self_originated_lsas_now(struct ospf *);

extern int ospf_lsa_is_self_originated(struct ospf *, struct ospf_lsa *);

extern struct ospf_lsa *ospf_lsa_lookup_by_prefix(struct ospf_lsdb *, uint8_t,
						  struct prefix_ipv4 *,
						  struct in_addr);

extern void ospf_lsa_maxage(struct ospf *, struct ospf_lsa *);
extern uint32_t get_metric(uint8_t *);

extern int ospf_lsa_maxage_walker(struct thread *);
extern struct ospf_lsa *ospf_lsa_refresh(struct ospf *, struct ospf_lsa *);

extern void ospf_external_lsa_refresh_default(struct ospf *);

extern void ospf_external_lsa_refresh_type(struct ospf *, uint8_t,
					   unsigned short, int);
extern struct ospf_lsa *ospf_external_lsa_refresh(struct ospf *,
						  struct ospf_lsa *,
						  struct external_info *, int);
extern struct in_addr ospf_lsa_unique_id(struct ospf *, struct ospf_lsdb *,
					 uint8_t, struct prefix_ipv4 *);
extern void ospf_schedule_lsa_flood_area(struct ospf_area *, struct ospf_lsa *);
extern void ospf_schedule_lsa_flush_area(struct ospf_area *, struct ospf_lsa *);

extern void ospf_refresher_register_lsa(struct ospf *, struct ospf_lsa *);
extern void ospf_refresher_unregister_lsa(struct ospf *, struct ospf_lsa *);
extern int ospf_lsa_refresh_walker(struct thread *);

extern void ospf_lsa_maxage_delete(struct ospf *, struct ospf_lsa *);

extern void ospf_discard_from_db(struct ospf *, struct ospf_lsdb *,
				 struct ospf_lsa *);
extern int is_prefix_default(struct prefix_ipv4 *);

extern int metric_type(struct ospf *, uint8_t, unsigned short);
extern int metric_value(struct ospf *, uint8_t, unsigned short);

extern struct in_addr ospf_get_nssa_ip(struct ospf_area *);
extern int ospf_translated_nssa_compare(struct ospf_lsa *, struct ospf_lsa *);
extern struct ospf_lsa *ospf_translated_nssa_refresh(struct ospf *,
						     struct ospf_lsa *,
						     struct ospf_lsa *);
extern struct ospf_lsa *ospf_translated_nssa_originate(struct ospf *,
						       struct ospf_lsa *);

#endif /* _ZEBRA_OSPF_LSA_H */
Commit	Line	Data
	1	/*
	2	* OSPF Link State Advertisement
	3	* Copyright (C) 1999, 2000 Toshiaki Takada
	4	*
	5	* This file is part of GNU Zebra.
	6	*
	7	* GNU Zebra is free software; you can redistribute it and/or modify it
	8	* under the terms of the GNU General Public License as published by the
	9	* Free Software Foundation; either version 2, or (at your option) any
	10	* later version.
	11	*
	12	* GNU Zebra is distributed in the hope that it will be useful, but
	13	* WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License along
	18	* with this program; see the file COPYING; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	20	*/
	21
	22	#ifndef _ZEBRA_OSPF_LSA_H
	23	#define _ZEBRA_OSPF_LSA_H
	24
	25	#include "stream.h"
	26
	27	/* OSPF LSA Default metric values */
	28	#define DEFAULT_DEFAULT_METRIC 20
	29	#define DEFAULT_DEFAULT_ORIGINATE_METRIC 10
	30	#define DEFAULT_DEFAULT_ALWAYS_METRIC 1
	31	#define DEFAULT_METRIC_TYPE EXTERNAL_METRIC_TYPE_2
	32
	33	/* OSPF LSA Range definition. */
	34	#define OSPF_MIN_LSA 1 /* begin range here */
	35	#define OSPF_MAX_LSA 12
	36
	37	/* OSPF LSA Type definition. */
	38	#define OSPF_UNKNOWN_LSA 0
	39	#define OSPF_ROUTER_LSA 1
	40	#define OSPF_NETWORK_LSA 2
	41	#define OSPF_SUMMARY_LSA 3
	42	#define OSPF_ASBR_SUMMARY_LSA 4
	43	#define OSPF_AS_EXTERNAL_LSA 5
	44	#define OSPF_GROUP_MEMBER_LSA 6 /* Not supported. */
	45	#define OSPF_AS_NSSA_LSA 7
	46	#define OSPF_EXTERNAL_ATTRIBUTES_LSA 8 /* Not supported. */
	47	#define OSPF_OPAQUE_LINK_LSA 9
	48	#define OSPF_OPAQUE_AREA_LSA 10
	49	#define OSPF_OPAQUE_AS_LSA 11
	50
	51	#define OSPF_LSA_HEADER_SIZE 20U
	52	#define OSPF_ROUTER_LSA_LINK_SIZE 12U
	53	#define OSPF_ROUTER_LSA_TOS_SIZE 4U
	54	#define OSPF_MAX_LSA_SIZE 1500U
	55
	56	/* AS-external-LSA refresh method. */
	57	#define LSA_REFRESH_IF_CHANGED 0
	58	#define LSA_REFRESH_FORCE 1
	59
	60	/* OSPF LSA header. */
	61	struct lsa_header {
	62	uint16_t ls_age;
	63	uint8_t options;
	64	uint8_t type;
	65	struct in_addr id;
	66	struct in_addr adv_router;
	67	uint32_t ls_seqnum;
	68	uint16_t checksum;
	69	uint16_t length;
	70	};
	71
	72	struct vertex;
	73
	74	/* OSPF LSA. */
	75	struct ospf_lsa {
	76	/* LSA origination flag. */
	77	uint8_t flags;
	78	#define OSPF_LSA_SELF 0x01
	79	#define OSPF_LSA_SELF_CHECKED 0x02
	80	#define OSPF_LSA_RECEIVED 0x04
	81	#define OSPF_LSA_APPROVED 0x08
	82	#define OSPF_LSA_DISCARD 0x10
	83	#define OSPF_LSA_LOCAL_XLT 0x20
	84	#define OSPF_LSA_PREMATURE_AGE 0x40
	85	#define OSPF_LSA_IN_MAXAGE 0x80
	86
	87	/* LSA data. */
	88	struct lsa_header *data;
	89
	90	/* Received time stamp. */
	91	struct timeval tv_recv;
	92
	93	/* Last time it was originated */
	94	struct timeval tv_orig;
	95
	96	/* All of reference count, also lock to remove. */
	97	int lock;
	98
	99	/* Flags for the SPF calculation. */
	100	struct vertex *stat;
	101
	102	/* References to this LSA in neighbor retransmission lists*/
	103	int retransmit_counter;
	104
	105	/* Area the LSA belongs to, may be NULL if AS-external-LSA. */
	106	struct ospf_area *area;
	107
	108	/* Parent LSDB. */
	109	struct ospf_lsdb *lsdb;
	110
	111	/* Related Route. */
	112	void *route;
	113
	114	/* Refreshement List or Queue */
	115	int refresh_list;
	116
	117	/* For Type-9 Opaque-LSAs */
	118	struct ospf_interface *oi;
	119
	120	/* VRF Id */
	121	vrf_id_t vrf_id;
	122	};
	123
	124	/* OSPF LSA Link Type. */
	125	#define LSA_LINK_TYPE_POINTOPOINT 1
	126	#define LSA_LINK_TYPE_TRANSIT 2
	127	#define LSA_LINK_TYPE_STUB 3
	128	#define LSA_LINK_TYPE_VIRTUALLINK 4
	129
	130	/* OSPF Router LSA Flag. */
	131	#define ROUTER_LSA_BORDER 0x01 /* The router is an ABR */
	132	#define ROUTER_LSA_EXTERNAL 0x02 /* The router is an ASBR */
	133	#define ROUTER_LSA_VIRTUAL 0x04 /* The router has a VL in this area */
	134	#define ROUTER_LSA_NT 0x10 /* The routers always translates Type-7 */
	135	#define ROUTER_LSA_SHORTCUT 0x20 /* Shortcut-ABR specific flag */
	136
	137	#define IS_ROUTER_LSA_VIRTUAL(x) ((x)->flags & ROUTER_LSA_VIRTUAL)
	138	#define IS_ROUTER_LSA_EXTERNAL(x) ((x)->flags & ROUTER_LSA_EXTERNAL)
	139	#define IS_ROUTER_LSA_BORDER(x) ((x)->flags & ROUTER_LSA_BORDER)
	140	#define IS_ROUTER_LSA_SHORTCUT(x) ((x)->flags & ROUTER_LSA_SHORTCUT)
	141	#define IS_ROUTER_LSA_NT(x) ((x)->flags & ROUTER_LSA_NT)
	142
	143	/* OSPF Router-LSA Link information. */
	144	struct router_lsa_link {
	145	struct in_addr link_id;
	146	struct in_addr link_data;
	147	struct {
	148	uint8_t type;
	149	uint8_t tos_count;
	150	uint16_t metric;
	151	} m[1];
	152	};
	153
	154	/* OSPF Router-LSAs structure. */
	155	#define OSPF_ROUTER_LSA_MIN_SIZE 4U /* w/0 link descriptors */
	156	/* There is an edge case, when number of links in a Router-LSA may be 0 without
	157	breaking the specification. A router, which has no other links to backbone
	158	area besides one virtual link, will not put any VL descriptor blocks into
	159	the Router-LSA generated for area 0 until a full adjacency over the VL is
	160	reached (RFC2328 12.4.1.3). In this case the Router-LSA initially received
	161	by the other end of the VL will have 0 link descriptor blocks, but soon will
	162	be replaced with the next revision having 1 descriptor block. */
	163	struct router_lsa {
	164	struct lsa_header header;
	165	uint8_t flags;
	166	uint8_t zero;
	167	uint16_t links;
	168	struct {
	169	struct in_addr link_id;
	170	struct in_addr link_data;
	171	uint8_t type;
	172	uint8_t tos;
	173	uint16_t metric;
	174	} link[1];
	175	};
	176
	177	/* OSPF Network-LSAs structure. */
	178	#define OSPF_NETWORK_LSA_MIN_SIZE 8U /* w/1 router-ID */
	179	struct network_lsa {
	180	struct lsa_header header;
	181	struct in_addr mask;
	182	struct in_addr routers[1];
	183	};
	184
	185	/* OSPF Summary-LSAs structure. */
	186	#define OSPF_SUMMARY_LSA_MIN_SIZE 8U /* w/1 TOS metric block */
	187	struct summary_lsa {
	188	struct lsa_header header;
	189	struct in_addr mask;
	190	uint8_t tos;
	191	uint8_t metric[3];
	192	};
	193
	194	/* OSPF AS-external-LSAs structure. */
	195	#define OSPF_AS_EXTERNAL_LSA_MIN_SIZE 16U /* w/1 TOS forwarding block */
	196	struct as_external_lsa {
	197	struct lsa_header header;
	198	struct in_addr mask;
	199	struct {
	200	uint8_t tos;
	201	uint8_t metric[3];
	202	struct in_addr fwd_addr;
	203	uint32_t route_tag;
	204	} e[1];
	205	};
	206
	207	#include "ospfd/ospf_opaque.h"
	208
	209	/* Macros. */
	210	#define GET_METRIC(x) get_metric(x)
	211	#define IS_EXTERNAL_METRIC(x) ((x) & 0x80)
	212
	213	#define GET_AGE(x) (ntohs ((x)->data->ls_age) + time (NULL) - (x)->tv_recv)
	214	#define LS_AGE(x) (OSPF_LSA_MAXAGE < get_age(x) ? OSPF_LSA_MAXAGE : get_age(x))
	215	#define IS_LSA_SELF(L) (CHECK_FLAG ((L)->flags, OSPF_LSA_SELF))
	216	#define IS_LSA_MAXAGE(L) (LS_AGE ((L)) == OSPF_LSA_MAXAGE)
	217
	218	#define OSPF_LSA_UPDATE_DELAY 2
	219
	220	#define OSPF_LSA_UPDATE_TIMER_ON(T, F) \
	221	if (!(T)) \
	222	(T) = thread_add_timer(master, (F), 0, 2)
	223
	224	/* Prototypes. */
	225	/* XXX: Eek, time functions, similar are in lib/thread.c */
	226	extern struct timeval int2tv(int);
	227	extern struct timeval msec2tv(int);
	228
	229	extern int get_age(struct ospf_lsa *);
	230	extern uint16_t ospf_lsa_checksum(struct lsa_header *);
	231	extern int ospf_lsa_checksum_valid(struct lsa_header *);
	232	extern int ospf_lsa_refresh_delay(struct ospf_lsa *);
	233
	234	extern const char dump_lsa_key(struct ospf_lsa );
	235	extern uint32_t lsa_seqnum_increment(struct ospf_lsa *);
	236	extern void lsa_header_set(struct stream *, uint8_t, uint8_t, struct in_addr,
	237	struct in_addr);
	238	extern struct ospf_neighbor ospf_nbr_lookup_ptop(struct ospf_interface );
	239	extern int ospf_check_nbr_status(struct ospf *);
	240
	241	/* Prototype for LSA primitive. */
	242	extern struct ospf_lsa *ospf_lsa_new(void);
	243	extern struct ospf_lsa *ospf_lsa_new_and_data(size_t size);
	244	extern struct ospf_lsa ospf_lsa_dup(struct ospf_lsa );
	245	extern void ospf_lsa_free(struct ospf_lsa *);
	246	extern struct ospf_lsa ospf_lsa_lock(struct ospf_lsa );
	247	extern void ospf_lsa_unlock(struct ospf_lsa **);
	248	extern void ospf_lsa_discard(struct ospf_lsa *);
	249	extern int ospf_lsa_flush_schedule(struct ospf , struct ospf_lsa );
	250	extern struct lsa_header *ospf_lsa_data_new(size_t);
	251	extern struct lsa_header ospf_lsa_data_dup(struct lsa_header );
	252	extern void ospf_lsa_data_free(struct lsa_header *);
	253
	254	/* Prototype for various LSAs */
	255	extern int ospf_router_lsa_update(struct ospf *);
	256	extern int ospf_router_lsa_update_area(struct ospf_area *);
	257
	258	extern void ospf_network_lsa_update(struct ospf_interface *);
	259
	260	extern struct ospf_lsa *
	261	ospf_summary_lsa_originate(struct prefix_ipv4 , uint32_t, struct ospf_area );
	262	extern struct ospf_lsa ospf_summary_asbr_lsa_originate(struct prefix_ipv4 ,
	263	uint32_t,
	264	struct ospf_area *);
	265
	266	extern struct ospf_lsa ospf_lsa_install(struct ospf , struct ospf_interface *,
	267	struct ospf_lsa *);
	268
	269	extern void ospf_nssa_lsa_flush(struct ospf ospf, struct prefix_ipv4 p);
	270	extern void ospf_external_lsa_flush(struct ospf *, uint8_t,
	271	struct prefix_ipv4 *,
	272	ifindex_t /* , struct in_addr nexthop */);
	273
	274	extern struct in_addr ospf_get_ip_from_ifp(struct ospf_interface *);
	275
	276	extern struct ospf_lsa ospf_external_lsa_originate(struct ospf ,
	277	struct external_info *);
	278	extern void ospf_external_lsa_rid_change(struct ospf *ospf);
	279	extern struct ospf_lsa ospf_lsa_lookup(struct ospf ospf, struct ospf_area *,
	280	uint32_t, struct in_addr,
	281	struct in_addr);
	282	extern struct ospf_lsa ospf_lsa_lookup_by_id(struct ospf_area , uint32_t,
	283	struct in_addr);
	284	extern struct ospf_lsa ospf_lsa_lookup_by_header(struct ospf_area ,
	285	struct lsa_header *);
	286	extern int ospf_lsa_more_recent(struct ospf_lsa , struct ospf_lsa );
	287	extern int ospf_lsa_different(struct ospf_lsa , struct ospf_lsa );
	288	extern void ospf_flush_self_originated_lsas_now(struct ospf *);
	289
	290	extern int ospf_lsa_is_self_originated(struct ospf , struct ospf_lsa );
	291
	292	extern struct ospf_lsa ospf_lsa_lookup_by_prefix(struct ospf_lsdb , uint8_t,
	293	struct prefix_ipv4 *,
	294	struct in_addr);
	295
	296	extern void ospf_lsa_maxage(struct ospf , struct ospf_lsa );
	297	extern uint32_t get_metric(uint8_t *);
	298
	299	extern int ospf_lsa_maxage_walker(struct thread *);
	300	extern struct ospf_lsa ospf_lsa_refresh(struct ospf , struct ospf_lsa *);
	301
	302	extern void ospf_external_lsa_refresh_default(struct ospf *);
	303
	304	extern void ospf_external_lsa_refresh_type(struct ospf *, uint8_t,
	305	unsigned short, int);
	306	extern struct ospf_lsa ospf_external_lsa_refresh(struct ospf ,
	307	struct ospf_lsa *,
	308	struct external_info *, int);
	309	extern struct in_addr ospf_lsa_unique_id(struct ospf , struct ospf_lsdb ,
	310	uint8_t, struct prefix_ipv4 *);
	311	extern void ospf_schedule_lsa_flood_area(struct ospf_area , struct ospf_lsa );
	312	extern void ospf_schedule_lsa_flush_area(struct ospf_area , struct ospf_lsa );
	313
	314	extern void ospf_refresher_register_lsa(struct ospf , struct ospf_lsa );
	315	extern void ospf_refresher_unregister_lsa(struct ospf , struct ospf_lsa );
	316	extern int ospf_lsa_refresh_walker(struct thread *);
	317
	318	extern void ospf_lsa_maxage_delete(struct ospf , struct ospf_lsa );
	319
	320	extern void ospf_discard_from_db(struct ospf , struct ospf_lsdb ,
	321	struct ospf_lsa *);
	322	extern int is_prefix_default(struct prefix_ipv4 *);
	323
	324	extern int metric_type(struct ospf *, uint8_t, unsigned short);
	325	extern int metric_value(struct ospf *, uint8_t, unsigned short);
	326
	327	extern struct in_addr ospf_get_nssa_ip(struct ospf_area *);
	328	extern int ospf_translated_nssa_compare(struct ospf_lsa , struct ospf_lsa );
	329	extern struct ospf_lsa ospf_translated_nssa_refresh(struct ospf ,
	330	struct ospf_lsa *,
	331	struct ospf_lsa *);
	332	extern struct ospf_lsa ospf_translated_nssa_originate(struct ospf ,
	333	struct ospf_lsa *);
	334
	335	#endif /* _ZEBRA_OSPF_LSA_H */