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/*
* BIRD -- OSPF
*
* (c) 1999--2004 Ondrej Filip <feela@network.cz>
* (c) 2009--2014 Ondrej Zajicek <santiago@crfreenet.org>
* (c) 2009--2014 CZ.NIC z.s.p.o.
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#ifndef _BIRD_OSPF_TOPOLOGY_H_
#define _BIRD_OSPF_TOPOLOGY_H_
struct top_hash_entry
{ /* Index for fast mapping (type,rtrid,LSid)->vertex */
snode n;
node cn; /* For adding into list of candidates
in intra-area routing table calculation */
struct top_hash_entry *next; /* Next in hash chain */
struct ospf_lsa_header lsa;
u16 lsa_type; /* lsa.type processed and converted to common values */
u16 init_age; /* Initial value for lsa.age during inst_time */
u32 domain; /* Area ID for area-wide LSAs, Iface ID for link-wide LSAs */
// struct ospf_area *oa;
void *lsa_body; /* May be NULL if LSA was flushed but hash entry was kept */
void *next_lsa_body; /* For postponed LSA origination */
u16 next_lsa_blen; /* For postponed LSA origination */
u16 next_lsa_opts; /* For postponed LSA origination */
bird_clock_t inst_time; /* Time of installation into DB */
struct ort *nf; /* Reference fibnode for sum and ext LSAs, NULL for otherwise */
struct mpnh *nhs; /* Computed nexthops - valid only in ospf_rt_spf() */
ip_addr lb; /* In OSPFv2, link back address. In OSPFv3, any global address in the area useful for vlinks */
u32 lb_id; /* Interface ID of link back iface (for bcast or NBMA networks) */
u32 dist; /* Distance from the root */
int ret_count; /* Number of retransmission lists referencing the entry */
u8 color;
#define OUTSPF 0
#define CANDIDATE 1
#define INSPF 2
u8 rtcalc; /* LSA generated during RT calculation (LSA_RTCALC or LSA_STALE)*/
u8 nhs_reuse; /* Whether nhs nodes can be reused during merging.
See a note in rt.c:merge_nexthops() */
};
#define LSA_RTCALC 1
#define LSA_STALE 2
struct top_graph
{
pool *pool; /* Pool we allocate from */
slab *hash_slab; /* Slab for hash entries */
struct top_hash_entry **hash_table; /* Hashing (modelled a`la fib) */
uint ospf2; /* Whether it is for OSPFv2 or OSPFv3 */
uint hash_size;
uint hash_order;
uint hash_mask;
uint hash_entries;
uint hash_entries_min, hash_entries_max;
};
struct ospf_new_lsa
{
u16 type;
u32 dom;
u32 id;
u16 opts;
u16 length;
struct ospf_iface *ifa;
struct ort *nf;
};
struct top_graph *ospf_top_new(pool *);
void ospf_top_free(struct top_graph *);
void ospf_top_dump(struct top_graph *, struct proto *);
struct top_hash_entry * ospf_install_lsa(struct ospf_proto *p, struct ospf_lsa_header *lsa, u32 type, u32 domain, void *body);
struct top_hash_entry * ospf_originate_lsa(struct ospf_proto *p, struct ospf_new_lsa *lsa);
void ospf_advance_lsa(struct ospf_proto *p, struct top_hash_entry *en, struct ospf_lsa_header *lsa, u32 type, u32 domain, void *body);
void ospf_flush_lsa(struct ospf_proto *p, struct top_hash_entry *en);
void ospf_update_lsadb(struct ospf_proto *p);
static inline void ospf_flush2_lsa(struct ospf_proto *p, struct top_hash_entry **en)
{ if (*en) { ospf_flush_lsa(p, *en); *en = NULL; } }
void ospf_originate_sum_net_lsa(struct ospf_proto *p, struct ospf_area *oa, ort *nf, int metric);
void ospf_originate_sum_rt_lsa(struct ospf_proto *p, struct ospf_area *oa, ort *nf, int metric, u32 options);
void ospf_originate_ext_lsa(struct ospf_proto *p, struct ospf_area *oa, ort *nf, u8 rtcalc, u32 metric, u32 ebit, ip_addr fwaddr, u32 tag, int pbit);
void ospf_rt_notify(struct proto *P, rtable *tbl, net *n, rte *new, rte *old, ea_list *attrs);
void ospf_update_topology(struct ospf_proto *p);
struct top_hash_entry *ospf_hash_find(struct top_graph *, u32 domain, u32 lsa, u32 rtr, u32 type);
struct top_hash_entry *ospf_hash_get(struct top_graph *, u32 domain, u32 lsa, u32 rtr, u32 type);
void ospf_hash_delete(struct top_graph *, struct top_hash_entry *);
static inline struct top_hash_entry * ospf_hash_find_entry(struct top_graph *f, struct top_hash_entry *en)
{ return ospf_hash_find(f, en->domain, en->lsa.id, en->lsa.rt, en->lsa_type); }
static inline struct top_hash_entry * ospf_hash_get_entry(struct top_graph *f, struct top_hash_entry *en)
{ return ospf_hash_get(f, en->domain, en->lsa.id, en->lsa.rt, en->lsa_type); }
struct top_hash_entry * ospf_hash_find_rt(struct top_graph *f, u32 domain, u32 rtr);
struct top_hash_entry * ospf_hash_find_rt3_first(struct top_graph *f, u32 domain, u32 rtr);
struct top_hash_entry * ospf_hash_find_rt3_next(struct top_hash_entry *e);
struct top_hash_entry * ospf_hash_find_net2(struct top_graph *f, u32 domain, u32 id);
/* In OSPFv2, id is network IP prefix (lsa.id) while lsa.rt field is unknown
In OSPFv3, id is lsa.rt of DR while nif is neighbor iface id (lsa.id) */
static inline struct top_hash_entry *
ospf_hash_find_net(struct top_graph *f, u32 domain, u32 id, u32 nif)
{
return f->ospf2 ?
ospf_hash_find_net2(f, domain, id) :
ospf_hash_find(f, domain, nif, id, LSA_T_NET);
}
#endif /* _BIRD_OSPF_TOPOLOGY_H_ */
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