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Implements proper RID handling in OSPFv3.

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This commit is contained in:
Ondrej Zajicek 2009-09-17 12:18:03 +02:00
parent c15e569065
commit 9f0ba7b1c7
3 changed files with 195 additions and 106 deletions
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198
proto/ospf/rt.c
View File

@ -225,10 +225,12 @@ process_prefixes(struct ospf_area *oa)
continue;
px = en->lsa_body;
/* FIXME: for router LSA, we should find the first one */
src = ospf_hash_find(po->gr, oa->areaid,
((px->ref_type == LSA_T_RT) ? px->ref_rt : px->ref_id),
px->ref_rt, px->ref_type);
/* For router prefix-LSA, we would like to find the first router-LSA */
if (px->ref_type == LSA_T_RT)
src = ospf_hash_find_rt(po->gr, oa->areaid, px->ref_rt);
else
src = ospf_hash_find(po->gr, oa->areaid, px->ref_id, px->ref_rt, px->ref_type);
if (!src)
continue;
@ -253,18 +255,107 @@ process_prefixes(struct ospf_area *oa)
}
#endif
static void
ospf_rt_spfa_rtlinks(struct ospf_area *oa, struct top_hash_entry *act, struct top_hash_entry *en)
{
struct proto *p = &oa->po->proto;
struct proto_ospf *po = oa->po;
orta nf;
u32 i;
struct ospf_lsa_rt *rt = en->lsa_body;
struct ospf_lsa_rt_link *rr = (struct ospf_lsa_rt_link *) (rt + 1);
for (i = 0; i < lsa_rt_count(&en->lsa); i++)
{
struct ospf_lsa_rt_link *rtl = rr + i;
struct top_hash_entry *tmp = NULL;
DBG(" Working on link: %R (type: %u) ", rtl->id, rtl->type);
switch (rtl->type)
{
#ifdef OSPFv2
case LSART_STUB:
/*
* This violates rfc2328! But it is mostly harmless.
*/
DBG("\n");
nf.type = RTS_OSPF;
nf.options = 0;
nf.metric1 = act->dist + rtl->metric;
nf.metric2 = LSINFINITY;
nf.tag = 0;
nf.oa = oa;
nf.ar = act;
nf.nh = act->nh;
nf.ifa = act->nhi;
if (act == oa->rt)
{
struct ospf_iface *iff;
WALK_LIST(iff, po->iface_list) /* Try to find corresponding interface */
{
if (iff->iface && (iff->type != OSPF_IT_VLINK) &&
(rtl->id == (ipa_to_u32(ipa_mkmask(iff->iface->addr->pxlen))
& ipa_to_u32(iff->iface->addr->prefix)))) /* No VLINK and IP must match */
{
nf.ifa = iff;
break;
}
}
}
if (!nf.ifa)
continue;
ri_install(po, ipa_from_u32(rtl->id),
ipa_mklen(ipa_from_u32(rtl->data)), ORT_NET, &nf, NULL);
break;
#endif
case LSART_NET:
#ifdef OSPFv2
/* In OSPFv2, rtl->id is IP addres of DR, Router ID is not known */
tmp = ospf_hash_find_net(po->gr, oa->areaid, rtl->id);
#else /* OSPFv3 */
tmp = ospf_hash_find(po->gr, oa->areaid, rtl->nif, rtl->id, LSA_T_NET);
#endif
if (tmp == NULL)
DBG("Not found!\n");
else
DBG("Found. :-)\n");
break;
case LSART_VLNK:
case LSART_PTP:
tmp = ospf_hash_find_rt(po->gr, oa->areaid, rtl->id);
DBG("PTP found.\n");
break;
default:
log("Unknown link type in router lsa. (rid = %R)", act->lsa.id);
break;
}
if (tmp)
DBG("Going to add cand, Mydist: %u, Req: %u\n",
tmp->dist, act->dist + rtl->metric);
add_cand(&oa->cand, tmp, act, act->dist + rtl->metric, oa);
}
}
static void
ospf_rt_spfa(struct ospf_area *oa)
{
u32 i, *rts;
struct ospf_lsa_rt *rt;
struct ospf_lsa_rt_link *rtl, *rr;
struct proto *p = &oa->po->proto;
struct proto_ospf *po = oa->po;
struct ospf_lsa_rt *rt;
struct ospf_lsa_net *ln;
orta nf;
struct ospf_iface *iface;
struct top_hash_entry *act, *tmp;
u32 i, *rts;
orta nf;
node *n;
if (oa->rt == NULL)
@ -300,7 +391,6 @@ ospf_rt_spfa(struct ospf_area *oa)
switch (act->lsa.type)
{
case LSA_T_RT:
/* FIXME - in OSPFv3 we should process all RT LSAs from that router */
rt = (struct ospf_lsa_rt *) act->lsa_body;
if (rt->options & OPT_RT_V)
oa->trcap = 1;
@ -320,83 +410,14 @@ ospf_rt_spfa(struct ospf_area *oa)
ri_install(po, ipa_from_rid(act->lsa.rt), MAX_PREFIX_LENGTH, ORT_ROUTER, &nf, NULL);
}
rr = (struct ospf_lsa_rt_link *) (rt + 1);
for (i = 0; i < lsa_rt_count(&act->lsa); i++)
{
tmp = NULL;
rtl = (rr + i);
DBG(" Working on link: %R (type: %u) ", rtl->id, rtl->type);
switch (rtl->type)
{
#ifdef OSPFv2
case LSART_STUB:
/*
* This violates rfc2328! But it is mostly harmless.
*/
DBG("\n");
nf.type = RTS_OSPF;
nf.options = 0;
nf.metric1 = act->dist + rtl->metric;
nf.metric2 = LSINFINITY;
nf.tag = 0;
nf.oa = oa;
nf.ar = act;
nf.nh = act->nh;
nf.ifa = act->nhi;
if (act == oa->rt)
{
struct ospf_iface *iff;
WALK_LIST(iff, po->iface_list) /* Try to find corresponding interface */
{
if (iff->iface && (iff->type != OSPF_IT_VLINK) &&
(rtl->id == (ipa_to_u32(ipa_mkmask(iff->iface->addr->pxlen))
& ipa_to_u32(iff->iface->addr->prefix)))) /* No VLINK and IP must match */
{
nf.ifa = iff;
break;
}
}
}
if (!nf.ifa)
continue;
ri_install(po, ipa_from_u32(rtl->id),
ipa_mklen(ipa_from_u32(rtl->data)), ORT_NET, &nf, NULL);
break;
#endif
case LSART_NET:
#ifdef OSPFv2
/* In OSPFv2, rtl->id is IP addres of DR, router ID is not known */
tmp = ospf_hash_find(po->gr, oa->areaid, rtl->id, 0, LSA_T_NET);
ospf_rt_spfa_rtlinks(oa, act, act);
#else /* OSPFv3 */
tmp = ospf_hash_find(po->gr, oa->areaid, rtl->nif, rtl->id, LSA_T_NET);
for (tmp = ospf_hash_find_rt_first(po->gr, act->domain, act->lsa.rt);
tmp; tmp = ospf_hash_find_rt_next(tmp))
ospf_rt_spfa_rtlinks(oa, act, tmp);
#endif
if (tmp == NULL)
DBG("Not found!\n");
else
DBG("Found. :-)\n");
break;
case LSART_VLNK:
case LSART_PTP:
/* FIXME - in OSPFv3, find lowest LSA ID */
tmp = ospf_hash_find(po->gr, oa->areaid, rtl->id, rtl->id, LSA_T_RT);
DBG("PTP found.\n");
break;
default:
log("Unknown link type in router lsa. (rid = %R)", act->lsa.id);
break;
}
if (tmp)
DBG("Going to add cand, Mydist: %u, Req: %u\n",
tmp->dist, act->dist + rtl->metric);
add_cand(&oa->cand, tmp, act, act->dist + rtl->metric, oa);
}
break;
case LSA_T_NET:
ln = act->lsa_body;
@ -410,8 +431,7 @@ ospf_rt_spfa(struct ospf_area *oa)
for (i = 0; i < lsa_net_count(&act->lsa); i++)
{
DBG(" Working on router %R ", rts[i]);
/* FIXME - in OSPFv3, find any LSA ID */
tmp = ospf_hash_find(po->gr, oa->areaid, rts[i], rts[i], LSA_T_RT);
tmp = ospf_hash_find_rt(po->gr, oa->areaid, rts[i]);
if (tmp != NULL)
DBG("Found :-)\n");
else
@ -431,9 +451,8 @@ ospf_rt_spfa(struct ospf_area *oa)
{
if ((iface->type == OSPF_IT_VLINK) && (iface->voa == oa))
{
/* FIXME in OSPFv3, different LSAID */
if ((tmp = ospf_hash_find(po->gr, oa->areaid, iface->vid, iface->vid, LSA_T_RT)) &&
(!ipa_equal(tmp->lb, IPA_NONE)))
if ((tmp = ospf_hash_find_rt(po->gr, oa->areaid, iface->vid)) &&
(!ipa_equal(tmp->lb, IPA_NONE)))
{
if ((iface->state != OSPF_IS_PTP) || (iface->iface != tmp->nhi->iface) || (!ipa_equal(iface->vip, tmp->lb)))
{
@ -1187,9 +1206,8 @@ again1:
{
if ((ifa->type == OSPF_IT_VLINK) && ipa_equal(ifa->vip, nf->n.nh))
{
/* FIXME in OSPFv3, may be different LSA ID */
if ((en = ospf_hash_find(po->gr, ifa->voa->areaid, ifa->vid, ifa->vid, LSA_T_RT))
&& (!ipa_equal(en->nh, IPA_NONE)))
if ((en = ospf_hash_find_rt(po->gr, ifa->voa->areaid, ifa->vid))
&& (!ipa_equal(en->nh, IPA_NONE)))
{
a0.gw = en->nh;
found = 1;

90
proto/ospf/topology.c
View File

@ -1303,15 +1303,19 @@ static inline unsigned
ospf_top_hash(struct top_graph *f, u32 domain, u32 lsaid, u32 rtrid, u32 type)
{
/* In OSPFv2, we don't know Router ID when looking for network LSAs.
dirty patch to make rt table calculation work. */
In OSPFv3, we don't know LSA ID when looking for router LSAs.
In both cases, there is (usually) just one (or small number)
appropriate LSA, so we just clear unknown part of key. */
return (ospf_top_hash_u32(lsaid) + type +
return (
#ifdef OSPFv2
((type == LSA_T_NET) ? 0 : ospf_top_hash_u32(rtrid)) +
ospf_top_hash_u32(lsaid) +
#else /* OSPFv3 */
ospf_top_hash_u32(rtrid) +
((type == LSA_T_RT) ? 0 : ospf_top_hash_u32(lsaid)) +
#endif
domain) & f->hash_mask;
type + domain) & f->hash_mask;
/*
return (ospf_top_hash_u32(lsaid) + ospf_top_hash_u32(rtrid) +
@ -1423,27 +1427,81 @@ struct top_hash_entry *
ospf_hash_find(struct top_graph *f, u32 domain, u32 lsa, u32 rtr, u32 type)
{
struct top_hash_entry *e;
e = f->hash_table[ospf_top_hash(f, domain, lsa, rtr, type)];
#ifdef OSPFv2
/* dirty patch to make rt table calculation work. */
if (type == LSA_T_NET)
{
while (e && (e->lsa.id != lsa || e->lsa.type != LSA_T_NET || e->domain != domain))
e = e->next;
return e;
}
#endif
while (e && (e->lsa.id != lsa || e->lsa.type != type || e->lsa.rt != rtr || e->domain != domain))
e = e->next;
return e;
}
#ifdef OSPFv2
/* In OSPFv2, sometimes we don't know Router ID when looking for network LSAs.
There should be just one, so we find any match. */
struct top_hash_entry *
ospf_hash_find_net(struct top_graph *f, u32 domain, u32 lsa)
{
struct top_hash_entry *e;
e = f->hash_table[ospf_top_hash(f, domain, lsa, 0, LSA_T_NET)];
while (e && (e->lsa.id != lsa || e->lsa.type != LSA_T_NET || e->domain != domain))
e = e->next;
return e;
}
#endif
#ifdef OSPFv3
/* In OSPFv3, usually we don't know LSA ID when looking for router
LSAs. We return matching LSA with smallest LSA ID. */
struct top_hash_entry *
ospf_hash_find_rt(struct top_graph *f, u32 domain, u32 rtr)
{
struct top_hash_entry *rv = NULL;
struct top_hash_entry *e;
e = f->hash_table[ospf_top_hash(f, domain, 0, rtr, LSA_T_RT)];
while (e)
{
if (e->lsa.rt == rtr && e->lsa.type == LSA_T_RT && e->domain == domain)
if (!rv || e->lsa.id < rv->lsa.id)
rv = e;
e = e->next;
}
return rv;
}
static inline struct top_hash_entry *
find_matching_rt(struct top_hash_entry *e, u32 domain, u32 rtr)
{
while (e && (e->lsa.rt != rtr || e->lsa.type != LSA_T_RT || e->domain != domain))
e = e->next;
return e;
}
struct top_hash_entry *
ospf_hash_find_rt_first(struct top_graph *f, u32 domain, u32 rtr)
{
struct top_hash_entry *e;
e = f->hash_table[ospf_top_hash(f, domain, 0, rtr, LSA_T_RT)];
return find_matching_rt(e, domain, rtr);
}
struct top_hash_entry *
ospf_hash_find_rt_next(struct top_hash_entry *e)
{
return find_matching_rt(e->next, e->domain, e->lsa.rt);
}
#endif
struct top_hash_entry *
ospf_hash_get(struct top_graph *f, u32 domain, u32 lsa, u32 rtr, u32 type)
{

13
proto/ospf/topology.h
View File

@ -72,7 +72,20 @@ void check_sum_lsa(struct proto_ospf *po, ort *nf, int);
void originate_sum_lsa(struct ospf_area *oa, struct fib_node *fn, int type, int metric, u32 options);
void flush_sum_lsa(struct ospf_area *oa, struct fib_node *fn, int type);
#ifdef OSPFv2
struct top_hash_entry * ospf_hash_find_net(struct top_graph *f, u32 domain, u32 lsa);
static inline struct top_hash_entry *
ospf_hash_find_rt(struct top_graph *f, u32 domain, u32 rtr)
{
return ospf_hash_find(f, domain, rtr, rtr, LSA_T_RT);
}
#else /* OSPFv3 */
struct top_hash_entry * ospf_hash_find_rt(struct top_graph *f, u32 domain, u32 rtr);
struct top_hash_entry * ospf_hash_find_rt_first(struct top_graph *f, u32 domain, u32 rtr);
struct top_hash_entry * ospf_hash_find_rt_next(struct top_hash_entry *e);
#endif
#endif /* _BIRD_OSPF_TOPOLOGY_H_ */