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Route calculation for stub networks.

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This commit is contained in:
Ondrej Filip 2000-05-02 19:27:57 +00:00
parent 53943a0022
commit a92847e78f
2 changed files with 89 additions and 0 deletions
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79
proto/ospf/rt.c
View file

@ -8,6 +8,15 @@
#include "ospf.h"
void
init_stub_fib(struct fib_node *fn)
{
struct stub_fib *sf=(struct stub_fib *)fn;
sf->metric=LSINFINITY;
sf->nhi=NULL;
}
void
ospf_rt_spfa(struct ospf_area *oa, struct proto *p)
{
@ -15,6 +24,8 @@ ospf_rt_spfa(struct ospf_area *oa, struct proto *p)
u32 i,*rts;
struct ospf_lsa_rt *rt;
struct ospf_lsa_rt_link *rtl,*rr;
struct fib fib;
struct stub_fib *sf;
/*
* First of all, mark all vertices as they are not in SPF
@ -147,6 +158,8 @@ ospf_rt_spfa(struct ospf_area *oa, struct proto *p)
DBG("Now calculating routes for stub networks.\n");
/* Now calculate routes to stub networks */
fib_init(&fib,p->pool,sizeof(struct stub_fib),16,init_stub_fib);
/*FIXME 16? */
WALK_SLIST_DELSAFE(SNODE en, SNODE nx, oa->lsal)
{
@ -162,6 +175,8 @@ ospf_rt_spfa(struct ospf_area *oa, struct proto *p)
}
if(en->lsa.type==LSA_T_RT)
{
ip_addr ip;
DBG("Working on LSA: rt: %I, id: %I, type: %u\n",en->lsa.rt,en->lsa.id,en->lsa.type);
rt=(struct ospf_lsa_rt *)en->lsa_body;
if((rt->VEB)&(1>>LSA_RT_V)) oa->trcap=1;
@ -172,7 +187,46 @@ ospf_rt_spfa(struct ospf_area *oa, struct proto *p)
if(rtl->type==LSART_STUB)
{
DBG(" Working on stub network: %I\n",rtl->id);
ip=ipa_from_u32(rtl->id);
/* Check destination and so on (pg 166) */
sf=fib_get(&fib,&ip,
ipa_mklen(ipa_from_u32(rtl->data)));
if(sf->metric>(en->dist+rtl->metric))
{
sf->metric=en->dist+rtl->metric;
calc_next_hop_fib(en,sf,p,oa);
if(sf->nhi!=NULL)
{
net *ne;
rta a0;
rte *e;
bzero(&a0, sizeof(a0));
a0.proto=p;
a0.source=RTS_OSPF;
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=sf->nhi;
a0.gw=sf->nh;
a0.from=sf->nh; /* FIXME Just a test */
ip=ipa_from_u32(rtl->id);
ne=net_get(p->table, ip, ipa_mklen(ipa_from_u32(rtl->data)));
e=rte_get_temp(&a0);
e->u.ospf.metric1=sf->metric;
e->u.ospf.metric2=0;
e->u.ospf.tag=0; /* FIXME Some config? */
e->pflags = 0;
e->net=ne;
DBG("Modifying stub rt entry %I mask %I\n (GW: %I, Iface: %s)\n",
ip,rtl->data,sf->nh,sf->nhi->name);
rte_update(p->table, ne, p, e);
}
}
}
}
}
@ -266,3 +320,28 @@ calc_next_hop(struct top_hash_entry *par, struct top_hash_entry *en,
en->nhi=par->nhi;
DBG(" Next hop calculated: %I\n", en->nh);
}
void
calc_next_hop_fib(struct top_hash_entry *par, struct stub_fib *en,
struct proto *p, struct ospf_area *oa)
{
struct ospf_neighbor *neigh;
struct proto_ospf *po=(struct proto_ospf *)p;
DBG(" Next hop called\n");
if(par==oa->rt) return;
if(par->nhi==NULL)
{
neighbor *nn;
DBG(" Next hop calculating for Fib\n");
if(par->lsa.type!=LSA_T_RT) return;
if((neigh=find_neigh_noifa(po,par->lsa.rt))==NULL) return;
nn=neigh_find(p,&neigh->ip,0);
DBG(" Next hop calculated: %I\n", nn->addr);
en->nh=nn->addr;
en->nhi=nn->iface;
return;
}
en->nh=par->nh;
en->nhi=par->nhi;
DBG(" Next hop calculated: %I\n", en->nh);
}

10
proto/ospf/rt.h
View file

@ -10,10 +10,20 @@
#ifndef _BIRD_OSPF_RT_H_
#define _BIRD_OSPF_RT_H_
struct stub_fib {
struct fib_node fn;
u16 metric;
u16 pad;
ip_addr nh;
struct iface *nhi;
};
void ospf_rt_spfa(struct ospf_area *oa, struct proto *p);
void add_cand(list *l, struct top_hash_entry *en, struct top_hash_entry *par,
u16 dist, struct proto *p, struct ospf_area *oa);
void calc_next_hop(struct top_hash_entry *par, struct top_hash_entry *en,
struct proto *p, struct ospf_area *oa);
void calc_next_hop_fib(struct top_hash_entry *par, struct stub_fib *en,
struct proto *p, struct ospf_area *oa);
#endif /* _BIRD_OSPF_RT_H_ */