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/*
* 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 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_LSA_H
#define _ZEBRA_OSPF_LSA_H
#include "stream.h"
/* OSPF LSA Range definition. */
#define OSPF_MIN_LSA 1 /* begin range here */
#if defined (HAVE_OPAQUE_LSA)
#define OSPF_MAX_LSA 12
#else
#define OSPF_MAX_LSA 8
#endif
/* 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
{
u_int16_t ls_age;
u_char options;
u_char type;
struct in_addr id;
struct in_addr adv_router;
u_int32_t ls_seqnum;
u_int16_t checksum;
u_int16_t length;
};
/* OSPF LSA. */
struct ospf_lsa
{
/* LSA origination flag. */
u_char 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. */
int stat;
#define LSA_SPF_NOT_EXPLORED -1
#define LSA_SPF_IN_SPFTREE -2
/* If stat >= 0, stat is LSA position in candidates heap. */
/* 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;
};
/* 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
{
u_char type;
u_char tos_count;
u_int16_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;
u_char flags;
u_char zero;
u_int16_t links;
struct
{
struct in_addr link_id;
struct in_addr link_data;
u_char type;
u_char tos;
u_int16_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;
u_char tos;
u_char 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
{
u_char tos;
u_char metric[3];
struct in_addr fwd_addr;
u_int32_t route_tag;
} e[1];
};
#ifdef HAVE_OPAQUE_LSA
#include "ospfd/ospf_opaque.h"
#endif /* HAVE_OPAQUE_LSA */
/* 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 tv_adjust (struct timeval);
extern int tv_ceil (struct timeval);
extern int tv_floor (struct timeval);
extern struct timeval intms2tv (int);
extern struct timeval int2tv (int);
extern struct timeval tv_add (struct timeval, struct timeval);
extern struct timeval tv_sub (struct timeval, struct timeval);
extern int tv_cmp (struct timeval, struct timeval);
extern int get_age (struct ospf_lsa *);
extern u_int16_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 u_int32_t lsa_seqnum_increment (struct ospf_lsa *);
extern void lsa_header_set (struct stream *, u_char, u_char, 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_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 *, u_int32_t,
struct ospf_area *);
extern struct ospf_lsa *ospf_summary_asbr_lsa_originate (struct prefix_ipv4 *,
u_int32_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 *, u_char, struct prefix_ipv4 *,
unsigned int /* , 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 int ospf_external_lsa_originate_timer (struct thread *);
extern int ospf_default_originate_timer (struct thread *);
extern struct ospf_lsa *ospf_lsa_lookup (struct ospf_area *, u_int32_t,
struct in_addr, struct in_addr);
extern struct ospf_lsa *ospf_lsa_lookup_by_id (struct ospf_area *,
u_int32_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 *, u_char,
struct prefix_ipv4 *,
struct in_addr);
extern void ospf_lsa_maxage (struct ospf *, struct ospf_lsa *);
extern u_int32_t get_metric (u_char *);
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 *, u_char, u_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 *, u_char,
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 *, u_char, u_short);
extern int metric_value (struct ospf *, u_char, u_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 */
|
