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9e48d717cf
bird/proto/ospf/rt.c
Ondrej Filip 9e48d717cf Test for "flushing" added.
2000-05-03 22:36:12 +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"
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 top_hash_entry *en, *nx;
u32 i,*rts;
struct ospf_lsa_rt *rt;
struct ospf_lsa_rt_link *rtl,*rr;
struct fib fib;
struct stub_fib *sf;
bird_clock_t delta;
int age=0,flush=0;
struct proto *p=&oa->po->proto;
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;
if(age) ospf_age(en,delta,flush,oa);
}
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;
struct ospf_lsa_net *netw;
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:
case LSART_VLNK:
DBG("Ignoring\n");
continue;
break;
case LSART_NET:
/* FIXME Oh shit so bad complication */
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: /* FIXME */
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:
netw=(struct ospf_lsa_net *)act->lsa_body;
rts=(u32 *)(netw+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;
}
/* FIXME Now modify rt for this entry */
if((act->lsa.type==LSA_T_NET)&&(act->nhi!=NULL))
{
net *ne;
rta a0;
rte *e;
ip_addr ip;
struct ospf_lsa_net *ln=act->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=act->nhi;
a0.gw=act->nh;
a0.from=act->nh; /* FIXME Just a test */
ip=ipa_and(ipa_from_u32(act->lsa.id),ln->netmask);
ne=net_get(p->table, ip, ipa_mklen(ln->netmask));
e=rte_get_temp(&a0);
e->u.ospf.metric1=act->dist;
e->u.ospf.metric2=0;
e->u.ospf.tag=0; /* FIXME Some config? */
e->pflags = 0;
e->net=ne;
DBG("Modifying rt entry %I mask %I\n (IP: %I, GW: %I, Iface: %s)\n",
act->lsa.id,ln->netmask,ip,act->nh,act->nhi->name);
rte_update(p->table, ne, p, e);
}
else
{
if(act->lsa.type==LSA_T_NET)
{
struct ospf_lsa_net *ln=act->lsa_body;
DBG("NOT modifying rt entry %I mask %I\n",act->lsa.id,ln->netmask);
}
}
}
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)
{
if((en->lsa.type==LSA_T_RT)||(en->lsa.type==LSA_T_NET))
{
if(en->dist==LSINFINITY)
{
/* FIXME I cannot remove node If I'm not FULL states */
//s_rem_node(SNODE en);
/* FIXME Remove from routing table! */
//mb_free(en->lsa_body);
//ospf_hash_delete(oa->gr, en);
}
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;
rr=(struct ospf_lsa_rt_link *)(rt+1);
for(i=0;i<rt->links;i++)
{
rtl=rr+i;
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,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);
}
}
}
}
}
}
}
}
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,en->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);
}
void
calc_next_hop_fib(struct top_hash_entry *par, struct stub_fib *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 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);
}
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