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Calculation of external routes.

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This commit is contained in:
Ondrej Filip 2000-05-10 10:47:17 +00:00
parent 4bfe4e8551
commit aa1e082c67
4 changed files with 193 additions and 4 deletions
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1
proto/ospf/ospf.c
View file

@ -15,6 +15,7 @@ ospf_start(struct proto *p)
DBG("%s: Start\n",p->name);
p->if_notify=ospf_if_notify;
fib_init(&po->efib,p->pool,sizeof(struct extfib),16,init_efib);
return PS_UP;
}

1
proto/ospf/ospf.h
View file

@ -341,6 +341,7 @@ struct proto_ospf {
list iface_list; /* Interfaces we really use */
list area_list;
int areano; /* Number of area I belong to */
struct fib efib; /* FIB for external routes */
};
static int ospf_start(struct proto *p);

186
proto/ospf/rt.c
View file

@ -8,6 +8,8 @@
#include "ospf.h"
#define LOCAL_DEBUG
void
init_infib(struct fib_node *fn)
{
@ -17,6 +19,17 @@ init_infib(struct fib_node *fn)
f->en=NULL;
}
void
init_efib(struct fib_node *fn)
{
struct extfib *f=(struct extfib *)fn;
f->metric=LSINFINITY;
f->metric2=LSINFINITY;
f->nh=ipa_from_u32(0);
f->nhi=NULL;
}
void
ospf_rt_spfa(struct ospf_area *oa)
{
@ -26,12 +39,12 @@ ospf_rt_spfa(struct ospf_area *oa)
struct ospf_lsa_rt_link *rtl,*rr;
struct fib *in=&oa->infib;
struct infib *nf;
struct fib_iterator fit;
bird_clock_t delta;
int age=0,flush=0;
struct proto *p=&oa->po->proto;
struct proto_ospf *po=oa->po;
ip_addr ip;
struct fib_iterator fit;
struct ospf_lsa_net *ln;
debug("%s: Starting routing table calculation for area %I\n",p->name,
@ -244,11 +257,176 @@ skip:
}
void
ospf_ext_spfa(struct proto_ospf *po)
ospf_ext_spfa(struct proto_ospf *po) /* FIXME looking into inter-area */
{
struct top_hash_entry *en;
struct top_hash_entry *en,*etmp,*absr;
struct fib *in=&po->efib;
struct extfib *nf;
struct fib_iterator efit;
struct ospf_area *oa=NULL,*atmp,*absroa;
struct proto *p=&po->proto;
struct ospf_lsa_ext *le;
struct ospf_lsa_ext_tos *lt;
int mlen;
ip_addr ip;
u16 met,met2;
/* FIXME Go on */
debug("%s: Starting routing table calculation for external routes\n",
p->name);
WALK_LIST(oa,po->area_list)
{
if(!oa->stub) break;
}
if(oa==NULL) return;
WALK_SLIST(en,oa->lsal)
{
if(en->lsa.type!=LSA_T_EXT) continue;
if(en->lsa.age==LSA_MAXAGE) continue;
if(en->lsa.rt==p->cf->global->router_id) continue;
le=en->lsa_body;
lt=(struct ospf_lsa_ext_tos *)(le+1);
if(lt->metric==LSINFINITY) continue;
ip=ipa_and(ipa_from_u32(en->lsa.id),le->netmask);
mlen=ipa_mklen(le->netmask);
nf=NULL;
WALK_LIST(atmp,po->area_list)
{
if((nf=fib_get(&atmp->infib,&ip, mlen))!=NULL) break;
}
if(nf!=NULL) continue; /* Some intra area path exists */
absr=NULL;
absroa=NULL;
met=0;met2=0;
if(1 || ipa_compare(lt->fwaddr,ipa_from_u32(0))==0) /* FIXME add fwaddr */
{
WALK_LIST(atmp,po->area_list)
{
if((etmp=ospf_hash_find(atmp->gr,en->lsa.rt,en->lsa.rt,LSA_T_RT))!=NULL)
{
if((absr==NULL) || (absr->dist>etmp->dist) ||
((etmp->dist==absr->dist) && (absroa->areaid<atmp->areaid)))
{
absr=etmp;
absroa=atmp;
}
}
}
if(absr==NULL) continue;
if(lt->etos>0)
{
met=absr->dist;
met2=lt->metric;
}
else
{
met=absr->dist+lt->metric;
met2=0;
}
}
nf=fib_get(&po->efib,&ip, mlen);
if((nf->metric>met) || ((nf->metric==met)&&(nf->metric2>met2)))
{
nf->metric=met;
nf->metric2=met2;
if(absr->nhi==NULL)
{
struct ospf_neighbor *neigh;
neighbor *nn;
if((neigh=find_neigh_noifa(po,absr->lsa.rt))==NULL)
{
goto skip2;
}
nn=neigh_find(p,&neigh->ip,0);
DBG(" Next hop calculated: %I\n", nn->addr);
nf->nh=nn->addr;
nf->nhi=nn->iface;
}
else
{
nf->nh=absr->nh;
nf->nhi=absr->nhi;
}
}
}
DBG("\nNow syncing my rt table with nest's\n\n");
FIB_ITERATE_INIT(&efit,&po->efib);
again2:
FIB_ITERATE_START(&po->efib,&efit,nfptmp)
{
nf=(struct extfib *)nfptmp;
if(nf->metric==LSINFINITY)
{
net *ne;
rta a0;
bzero(&a0, sizeof(a0));
a0.proto=p;
a0.source=RTS_OSPF_EXT;
a0.scope=SCOPE_UNIVERSE; /* What's this good for? */
a0.cast=RTC_UNICAST;
a0.dest=RTD_ROUTER;
a0.flags=0;
a0.aflags=0;
a0.iface=nf->nhi;
a0.gw=nf->nh;
a0.from=nf->nh; /* FIXME Just a test */
ne=net_get(p->table, nf->fn.prefix, nf->fn.pxlen);
DBG("Deleting rt entry %I\n (IP: %I, GW: %I, Iface: %s)\n",
nf->fn.prefix,ip,nf->nh,nf->nhi->name);
rte_update(p->table, ne, p, NULL);
/* Now delete my fib */
FIB_ITERATE_PUT(&efit, nfptmp);
fib_delete(&po->efib, nfptmp);
goto again2;
}
else
{
net *ne;
rta a0;
rte *e;
bzero(&a0, sizeof(a0));
a0.proto=p;
a0.source=RTS_OSPF_EXT;
a0.scope=SCOPE_UNIVERSE; /* What's this good for? */
a0.cast=RTC_UNICAST;
a0.dest=RTD_ROUTER;
a0.flags=0;
a0.aflags=0;
a0.iface=nf->nhi;
a0.gw=nf->nh;
a0.from=nf->nh; /* FIXME Just a test */
ne=net_get(p->table, nf->fn.prefix, nf->fn.pxlen);
e=rte_get_temp(&a0);
e->u.ospf.metric1=nf->metric;
e->u.ospf.metric2=nf->metric2;
e->u.ospf.tag=0; /* FIXME Some config? */
e->pflags = 0;
e->net=ne;
e->pref = p->preference;
DBG("Modifying rt entry %I\n (IP: %I, GW: %I, Iface: %s)\n",
nf->fn.prefix,ip,en->nh,en->nhi->name);
rte_update(p->table, ne, p, e);
}
}
skip2:
FIB_ITERATE_END(nfptmp);
}
void

9
proto/ospf/rt.h
View file

@ -17,6 +17,14 @@ struct infib {
struct top_hash_entry *en;
};
struct extfib {
struct fib_node fn;
u16 metric;
u16 metric2;
ip_addr nh;
struct iface *nhi;
};
void ospf_rt_spfa(struct ospf_area *oa);
void ospf_ext_spfa(struct proto_ospf *po);
void add_cand(list *l, struct top_hash_entry *en, struct top_hash_entry *par,
@ -24,5 +32,6 @@ void add_cand(list *l, struct top_hash_entry *en, struct top_hash_entry *par,
void calc_next_hop(struct top_hash_entry *par, struct top_hash_entry *en,
struct ospf_area *oa);
void init_infib(struct fib_node *fn);
void init_efib(struct fib_node *fn);
#endif /* _BIRD_OSPF_RT_H_ */