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bird/proto/ospf/rt.c
Ondrej Filip 7e681ef360 Calculation of external routes works. :-)
2000-05-12 00:22:43 +00:00

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/*
* BIRD -- OSPF
*
* (c) 2000 Ondrej Filip <feela@network.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include "ospf.h"
#define LOCAL_DEBUG
void
init_infib(struct fib_node *fn)
{
struct infib *f=(struct infib *)fn;
f->metric=LSINFINITY;
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)
{
struct top_hash_entry *en, *nx;
u32 i,*rts;
struct ospf_lsa_rt *rt;
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 ospf_lsa_net *ln;
debug("%s: Starting routing table calculation for area %I\n",p->name,
oa->areaid);
flush=can_flush_lsa(oa);
if((delta=now-oa->lage)>=AGINGDELTA)
{
oa->lage=now;
age=1;
}
WALK_SLIST_DELSAFE(SNODE en, nx, oa->lsal)
{
en->color=OUTSPF;
en->dist=LSINFINITY;
en->nhi=NULL;
if(age) ospf_age(en,delta,flush,oa);
}
FIB_WALK(in,nftmp)
{
nf=(struct infib *)nftmp;
nf->metric=LSINFINITY;
}
FIB_WALK_END;
init_list(&oa->cand); /* Empty list of candidates */
oa->trcap=0;
DBG("LSA db prepared, adding me into candidate list.\n");
oa->rt->dist=0;
oa->rt->color=CANDIDATE;
add_head(&oa->cand, &oa->rt->cn);
DBG("RT LSA: rt: %I, id: %I, type: %u\n",oa->rt->lsa.rt,oa->rt->lsa.id,oa->rt->lsa.type);
while(!EMPTY_LIST(oa->cand))
{
struct top_hash_entry *act,*tmp;
node *n;
u16 met;
n=HEAD(oa->cand);
act=SKIP_BACK(struct top_hash_entry, cn, n);
rem_node(n);
DBG("Working on LSA: rt: %I, id: %I, type: %u\n",act->lsa.rt,act->lsa.id,act->lsa.type);
act->color=INSPF;
switch(act->lsa.type)
{
case LSA_T_RT:
rt=(struct ospf_lsa_rt *)act->lsa_body;
if((rt->VEB)&(1>>LSA_RT_V)) oa->trcap=1;
rr=(struct ospf_lsa_rt_link *)(rt+1);
DBG(" Number of links: %u\n",rt->links);
for(i=0;i<rt->links;i++)
{
tmp=NULL;
rtl=(rr+i);
DBG(" Working on link: %I (type: %u) ",rtl->id,rtl->type);
switch(rtl->type)
{
case LSART_STUB:
DBG("\n");
ip=ipa_from_u32(rtl->id);
nf=fib_get(in,&ip, ipa_mklen(ipa_from_u32(rtl->data)));
if(nf->metric>(met=act->dist+rtl->metric))
{
nf->metric=met;
nf->en=act;
}
break;
case LSART_VLNK:
DBG("Ignoring\n");
continue;
break;
case LSART_NET:
tmp=ospf_hash_find(oa->gr,rtl->id,rtl->id,LSA_T_NET);
if(tmp==NULL) DBG("Fuck!\n");
else DBG("Found. :-)\n");
break;
case LSART_PTP:
tmp=ospf_hash_find(oa->gr,rtl->id,rtl->id,LSA_T_RT);
DBG("PTP searched.\n");
break;
default:
log("Unknown link type in router lsa.\n");
break;
}
add_cand(&oa->cand,tmp,act,act->dist+rtl->metric,oa);
}
break;
case LSA_T_NET: /* FIXME Add to fib */
ln=act->lsa_body;
ip=ipa_and(ipa_from_u32(act->lsa.id),ln->netmask);
nf=fib_get(in,&ip, ipa_mklen(ln->netmask));
if(nf->metric>act->dist)
{
nf->metric=act->dist;
nf->en=act;
}
rts=(u32 *)(ln+1);
for(i=0;i<(act->lsa.length-sizeof(struct ospf_lsa_header)-
sizeof(struct ospf_lsa_net))/sizeof(u32);i++)
{
DBG(" Working on router %I ",*(rts+i));
tmp=ospf_hash_find(oa->gr, *(rts+i), *(rts+i), LSA_T_RT);
if(tmp!=NULL) DBG("Found :-)\n");
else DBG("Fuck!\n");
add_cand(&oa->cand,tmp,act,act->dist,oa);
}
break;
}
}
/* Now sync our fib with nest's */
DBG("\nNow syncing my rt table with nest's\n\n");
FIB_ITERATE_INIT(&fit,in);
again:
FIB_ITERATE_START(in,&fit,nftmp)
{
nf=(struct infib *)nftmp;
if(nf->metric==LSINFINITY)
{
net *ne;
struct top_hash_entry *en=nf->en;
ln=en->lsa_body;
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,en->nh,en->nhi->name);
rte_update(p->table, ne, p, NULL);
/* Now delete my fib */
FIB_ITERATE_PUT(&fit, nftmp);
fib_delete(in, nftmp);
goto again;
}
else
{
/* Update routing table */
if(nf->en->nhi==NULL)
{
struct top_hash_entry *en=nf->en;
struct ospf_neighbor *neigh;
neighbor *nn;
if((neigh=find_neigh_noifa(po,en->lsa.rt))==NULL)
{
goto skip;
}
nn=neigh_find(p,&neigh->ip,0);
DBG(" Next hop calculated: %I\n", nn->addr);
en->nh=nn->addr;
en->nhi=nn->iface;
}
{
net *ne;
rta a0;
rte *e;
struct top_hash_entry *en=nf->en;
ln=en->lsa_body;
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=en->nhi;
a0.gw=en->nh;
a0.from=en->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=0;
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);
}
}
}
skip:
FIB_ITERATE_END(nftmp);
ospf_ext_spfa(po);
}
void
ospf_ext_spfa(struct proto_ospf *po) /* FIXME looking into inter-area */
{
struct top_hash_entry *en,*etmp,*absr;
struct fib *ef=&po->efib;
struct extfib *nf;
struct fib_iterator fit;
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;
debug("%s: Starting routing table calculation for external routes\n",
p->name);
FIB_WALK(ef,nftmp)
{
nf=(struct extfib *)nftmp;
nf->metric=LSINFINITY;
nf->metric2=LSINFINITY;
}
FIB_WALK_END;
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_find(&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(ef,&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)
{
continue;
}
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(&fit,ef);
noch:
FIB_ITERATE_START(ef,&fit,nftmp)
{
nf=(struct extfib *)nftmp;
if(nf->metric==LSINFINITY)
{
net *ne;
ne=net_get(p->table, nf->fn.prefix, nf->fn.pxlen);
DBG("Deleting rt entry %I\n (IP: %I, GW: %I)\n",
nf->fn.prefix,ip,nf->nh);
rte_update(p->table, ne, p, NULL);
/* Now delete my fib */
FIB_ITERATE_PUT(&fit, nftmp);
fib_delete(ef, nftmp);
goto noch;
}
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)\n",
nf->fn.prefix,ip,nf->nh);
rte_update(p->table, ne, p, e);
}
}
let:
FIB_ITERATE_END(nftmp);
}
void
add_cand(list *l, struct top_hash_entry *en, struct top_hash_entry *par,
u16 dist, struct ospf_area *oa)
{
node *prev,*n;
int flag=0,added=0;
struct top_hash_entry *act;
struct proto *p=&oa->po->proto;
if(en==NULL) return;
if(en->lsa.age==LSA_MAXAGE) return;
/* FIXME Does it have link back? Test it! */
if(en->color==INSPF) return;
if(dist>=en->dist) return;
/*
* FIXME The line above is not a bug, but we don't support
* multiple next hops. I'll start as soon as nest will
*/
DBG(" Adding candidate: rt: %I, id: %I, type: %u\n",en->lsa.rt,en->lsa.id,en->lsa.type);
en->nhi=NULL;
calc_next_hop(par,en,oa);
if(en->color==CANDIDATE) /* We found a shorter path */
{
rem_node(&en->cn);
}
en->dist=dist;
en->color=CANDIDATE;
prev=NULL;
if(EMPTY_LIST(*l))
{
add_head(l,&en->cn);
}
else
{
WALK_LIST(n,*l)
{
act=SKIP_BACK(struct top_hash_entry, cn, n);
if((act->dist>dist)||
((act->dist==dist)&&(act->lsa.type==LSA_T_NET)))
{
if(prev==NULL) add_head(l,&en->cn);
else insert_node(&en->cn,prev);
added=1;
break;
}
prev=n;
}
if(!added)
{
add_tail(l,&en->cn);
}
}
/* FIXME Some VLINK staff should be here */
}
void
calc_next_hop(struct top_hash_entry *par, struct top_hash_entry *en,
struct ospf_area *oa)
{
struct ospf_neighbor *neigh;
struct proto *p=&oa->po->proto;
struct proto_ospf *po=oa->po;
DBG(" Next hop called\n");
if(par==oa->rt) return;
if(par->nhi==NULL)
{
neighbor *nn;
DBG(" Next hop calculating for id: %I rt: %I type: %u\n",en->lsa.id,en->lsa.rt,en->lsa.type);
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);
}
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