topology.h 3.34 KB
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/*
 *	BIRD -- OSPF
 *
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 *	(c) 1999--2004 Ondrej Filip <feela@network.cz>
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 *
 *	Can be freely distributed and used under the terms of the GNU GPL.
 */

#ifndef _BIRD_OSPF_TOPOLOGY_H_
#define _BIRD_OSPF_TOPOLOGY_H_

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struct top_hash_entry
{				/* Index for fast mapping (type,rtrid,LSid)->vertex */
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  snode n;
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  node cn;			/* For adding into list of candidates
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				   in intra-area routing table calculation */
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  struct top_hash_entry *next;	/* Next in hash chain */
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  struct ospf_lsa_header lsa;
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  u32 domain;			/* Area ID for area-wide LSAs, Iface ID for link-wide LSAs */
  //  struct ospf_area *oa;
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  void *lsa_body;
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  bird_clock_t inst_t;		/* Time of installation into DB */
  ip_addr nh;			/* Next hop */
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  ip_addr lb;			/* In OSPFv2, link back address. In OSPFv3, any global address in the area useful for vlinks */
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  struct ospf_iface *nhi;	/* Next hop interface */
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#ifdef OSPFv3
  u32 lb_id;			/* Interface ID of link back iface (for bcast or NBMA networks) */
#endif
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  u32 dist;			/* Distance from the root */
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  u16 ini_age;
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  u8 color;
#define OUTSPF 0
#define CANDIDATE 1
#define INSPF 2
  u8 padding;
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};

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struct top_graph
{
  pool *pool;			/* Pool we allocate from */
  slab *hash_slab;		/* Slab for hash entries */
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  struct top_hash_entry **hash_table;	/* Hashing (modelled a`la fib) */
  unsigned int hash_size;
  unsigned int hash_order;
  unsigned int hash_mask;
  unsigned int hash_entries;
  unsigned int hash_entries_min, hash_entries_max;
};

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struct top_graph *ospf_top_new(pool *);
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void ospf_top_free(struct top_graph *);
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void ospf_top_dump(struct top_graph *, struct proto *);
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u32 ospf_lsa_domain(u32 type, struct ospf_iface *ifa);
struct top_hash_entry *ospf_hash_find_header(struct top_graph *f, u32 domain,
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					     struct ospf_lsa_header *h);
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struct top_hash_entry *ospf_hash_get_header(struct top_graph *f, u32 domain,
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					    struct ospf_lsa_header *h);
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struct top_hash_entry *ospf_hash_find(struct top_graph *, u32 domain, u32 lsa, u32 rtr,
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				      u32 type);
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struct top_hash_entry *ospf_hash_get(struct top_graph *, u32 domain, u32 lsa, u32 rtr,
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				     u32 type);
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void ospf_hash_delete(struct top_graph *, struct top_hash_entry *);
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void originate_rt_lsa(struct ospf_area *oa);
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void update_rt_lsa(struct ospf_area *oa);
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void originate_net_lsa(struct ospf_iface *ifa);
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void update_net_lsa(struct ospf_iface *ifa);
void update_link_lsa(struct ospf_iface *ifa);
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int can_flush_lsa(struct proto_ospf *po);
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int max_ext_lsa(unsigned pxlen);
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void originate_ext_lsa(net * n, rte * e, struct proto_ospf *po,
		       struct ea_list *attrs);
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void flush_ext_lsa(net *n, struct proto_ospf *po);
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void check_sum_lsa(struct proto_ospf *po, ort *nf, int);
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void originate_sum_lsa(struct ospf_area *oa, struct fib_node *fn, int type, int metric, u32 options);
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void flush_sum_lsa(struct ospf_area *oa, struct fib_node *fn, int type);

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#ifdef OSPFv2
struct top_hash_entry * ospf_hash_find_net(struct top_graph *f, u32 domain, u32 lsa);
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static inline struct top_hash_entry *
ospf_hash_find_rt(struct top_graph *f, u32 domain, u32 rtr)
{
  return ospf_hash_find(f, domain, rtr, rtr, LSA_T_RT);
}

#else /* OSPFv3 */
struct top_hash_entry * ospf_hash_find_rt(struct top_graph *f, u32 domain, u32 rtr);
struct top_hash_entry * ospf_hash_find_rt_first(struct top_graph *f, u32 domain, u32 rtr);
struct top_hash_entry * ospf_hash_find_rt_next(struct top_hash_entry *e);
#endif
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#endif /* _BIRD_OSPF_TOPOLOGY_H_ */