static int calc_next_hop(struct ospf_area *oa,
struct top_hash_entry *en,
struct top_hash_entry *par);
-static void ospf_ext_spf(struct proto_ospf *po);
static void rt_sync(struct proto_ospf *po);
/* In ospf_area->rtr we store paths to routers, but we use RID (and not IP address)
{
orta->type = RTS_DUMMY;
orta->options = 0;
- orta->oa = NULL;
orta->metric1 = LSINFINITY;
orta->metric2 = LSINFINITY;
- orta->nh = IPA_NONE;
- orta->ifa = NULL;
- orta->ar = NULL;
orta->tag = 0;
orta->rid = 0;
+ orta->oa = NULL;
+ orta->ifa = NULL;
+ orta->nh = IPA_NONE;
}
void
ort *ri = (ort *) fn;
fill_ri(&ri->n);
memcpy(&ri->o, &ri->n, sizeof(orta));
- ri->efn = NULL;
}
-/* If new is better return 1 */
+/* Whether the ASBR or the forward address destination is preferred in AS external route selection
+ according to 16.4.1. */
+static inline int
+epath_preferred(orta *ep)
+{
+ return (ep->type == RTS_OSPF) && (ep->oa->areaid != 0);
+}
-/*
- * This is hard to understand:
- * If rfc1583 is set to 1, it work likes normal route_better()
- * But if it is set to 0, it prunes number of AS boundary
- * routes before it starts the router decision
- */
+/* If new is better return 1 */
static int
-ri_better(struct proto_ospf *po, orta * new, ort *nefn, orta * old, ort *oefn, int rfc1583)
+ri_better(struct proto_ospf *po, orta *new, orta *old)
{
- int newtype = new->type;
- int oldtype = old->type;
-
if (old->type == RTS_DUMMY)
return 1;
if (old->metric1 == LSINFINITY)
return 1;
- if (!rfc1583)
+ if (new->type < old->type)
+ return 1;
+
+ if (new->type > old->type)
+ return 0;
+
+ if (new->metric1 < old->metric1)
+ return 1;
+
+ if (new->metric1 > old->metric1)
+ return 0;
+
+ return 0;
+}
+
+
+/* 16.4. (3), return 1 if new is better */
+static int
+ri_better_asbr(struct proto_ospf *po, orta *new, orta *old)
+{
+ /* We know that the old ASBB is valid */
+
+ if (!po->rfc1583)
{
- if ((new->type < RTS_OSPF_EXT1) && (new->oa->areaid == 0)) newtype = RTS_OSPF_IA;
- if ((old->type < RTS_OSPF_EXT1) && (old->oa->areaid == 0)) oldtype = RTS_OSPF_IA;
+ int new_pref = epath_preferred(new);
+ int old_pref = epath_preferred(old);
+
+ if (new_pref > old_pref)
+ return 1;
+
+ if (new_pref < old_pref)
+ return 0;
}
- if (newtype < oldtype)
+ if (new->metric1 < old->metric1)
return 1;
- if (newtype > oldtype)
+ if (new->metric1 > old->metric1)
return 0;
- /* Same type */
+ /* Larger area ID is preferred */
+ if (new->oa->areaid > old->oa->areaid)
+ return 1;
+
+ return 0;
+}
+
+/* 16.4. (6), return 1 if new is better */
+static int
+ri_better_ext(struct proto_ospf *po, orta *new, orta *old)
+{
+ if (old->type == RTS_DUMMY)
+ return 1;
+
+ if (old->metric1 == LSINFINITY)
+ return 1;
+
+ /* 16.4. (6a) */
+ if (new->type < old->type)
+ return 1;
+
+ if (new->type > old->type)
+ return 0;
+
+ /* 16.4. (6b), same type */
if (new->type == RTS_OSPF_EXT2)
{
- if (new->metric2 < old->metric2) return 1;
- if (new->metric2 > old->metric2) return 0;
+ if (new->metric2 < old->metric2)
+ return 1;
+
+ if (new->metric2 > old->metric2)
+ return 0;
}
- if (((new->type == RTS_OSPF_EXT2) || (new->type == RTS_OSPF_EXT1)) && (!po->rfc1583))
+ /* 16.4. (6c) */
+ if (!po->rfc1583)
{
- newtype = nefn->n.type;
- oldtype = oefn->n.type;
+ u32 new_pref = new->options & ORTA_PREF;
+ u32 old_pref = old->options & ORTA_PREF;
- if (nefn->n.oa->areaid == 0) newtype = RTS_OSPF_IA;
- if (oefn->n.oa->areaid == 0) oldtype = RTS_OSPF_IA;
+ if (new_pref > old_pref)
+ return 1;
- if (newtype < oldtype) return 1;
- if (newtype > oldtype) return 0;
+ if (new_pref < old_pref)
+ return 0;
}
+ /* 16.4. (6d) */
if (new->metric1 < old->metric1)
return 1;
if (new->metric1 > old->metric1)
return 0;
- if (new->oa->areaid > old->oa->areaid) return 1; /* Larger AREAID is preffered */
+ return 0;
+}
- return 0; /* Old is shorter or same */
+static inline void
+ri_install_net(struct proto_ospf *po, ip_addr prefix, int pxlen, orta *new)
+{
+ ort *old = (ort *) fib_get(&po->rtf, &prefix, pxlen);
+ if (ri_better(po, new, &old->n))
+ memcpy(&old->n, new, sizeof(orta));
}
-static void
-ri_install(struct proto_ospf *po, ip_addr prefix, int pxlen, int dest,
- orta * new, ort * ipath)
+static inline void
+ri_install_rt(struct ospf_area *oa, u32 rid, orta *new)
{
- struct ospf_area *oa = new->oa;
- ort *old;
+ ip_addr addr = ipa_from_rid(rid);
+ ort *old = (ort *) fib_get(&oa->rtr, &addr, MAX_PREFIX_LENGTH);
+ if (ri_better(oa->po, new, &old->n))
+ memcpy(&old->n, new, sizeof(orta));
+}
- if (dest == ORT_NET)
- {
- struct area_net *anet;
- old = (ort *) fib_get(&po->rtf, &prefix, pxlen);
- if (ri_better(po, new, ipath, &old->n, old->efn, 1))
- {
- memcpy(&old->n, new, sizeof(orta));
- old->efn = ipath;
- if ((new->type == RTS_OSPF) && (anet = (struct area_net *)fib_route(&oa->net_fib, prefix, pxlen)))
- {
- anet->active = 1;
- if (new->metric1 > anet->metric) anet->metric = new->metric1;
- }
- }
- }
- else
- {
- old = (ort *) fib_get(&oa->rtr, &prefix, pxlen);
+static inline void
+ri_install_ext(struct proto_ospf *po, ip_addr prefix, int pxlen, orta *new)
+{
+ ort *old = (ort *) fib_get(&po->rtf, &prefix, pxlen);
+ if (ri_better_ext(po, new, &old->n))
+ memcpy(&old->n, new, sizeof(orta));
+}
- if (ri_better(po, new, ipath, &old->n, old->efn, 1))
- {
- memcpy(&old->n, new, sizeof(orta));
- old->efn = ipath;
- }
- }
+static inline void
+update_anet(struct ospf_area *oa, ip_addr prefix, int pxlen, u32 metric)
+{
+ struct area_net *anet = (struct area_net *) fib_route(&oa->net_fib, prefix, pxlen);
+ if (!anet)
+ return;
+
+ anet->active = 1;
+ if (metric > anet->metric)
+ anet->metric = metric;
}
+
#ifdef OSPFv2
static struct ospf_iface *
static void
add_network(struct ospf_area *oa, ip_addr px, int pxlen, int metric, struct top_hash_entry *en)
{
- orta nf;
- nf.type = RTS_OSPF;
- nf.options = 0;
- nf.metric1 = metric;
- nf.metric2 = LSINFINITY;
- nf.tag = 0;
- nf.oa = oa;
- nf.ar = en;
- nf.nh = en->nh;
- nf.ifa = en->nhi;
- nf.rid = en->lsa.rt;
+ orta nf = {
+ .type = RTS_OSPF,
+ .options = 0,
+ .metric1 = metric,
+ .metric2 = LSINFINITY,
+ .tag = 0,
+ .rid = en->lsa.rt,
+ .oa = oa,
+ .ifa = en->nhi,
+ .nh = en->nh
+ };
if (en == oa->rt)
{
*/
nf.ifa = find_stub_src(oa, px, pxlen);
+ nf.nh = IPA_NONE;
if (!nf.ifa)
return;
}
- ri_install(oa->po, px, pxlen, ORT_NET, &nf, NULL);
+ ri_install_net(oa->po, px, pxlen, &nf);
+ update_anet(oa, px, pxlen, metric);
}
#ifdef OSPFv3
if (!src)
continue;
+ /* Reachable in SPF */
+ if (src->color != INSPF)
+ continue;
+
if (src->lsa.age == LSA_MAXAGE)
continue;
if (pxopts & OPT_PX_NU)
continue;
+ /* Store the first global address to use it later as a vlink endpoint */
+ if ((pxopts & OPT_PX_LA) && ipa_zero(src->lb))
+ src->lb = pxa;
+
add_network(oa, pxa, pxlen, src->dist + metric, src);
}
}
}
}
-/* 16.1 calculating shortest paths for an area */
+/* RFC 2328 16.1. calculating shortest paths for an area */
static void
ospf_rt_spfa(struct ospf_area *oa)
{
struct proto_ospf *po = oa->po;
struct ospf_lsa_rt *rt;
struct ospf_lsa_net *ln;
- struct ospf_iface *iface;
struct top_hash_entry *act, *tmp;
u32 i, *rts;
- orta nf;
node *n;
if (oa->rt == NULL)
if (rt->options & OPT_RT_V)
oa->trcap = 1;
- /* In OSPFv2, just ASBRs and ABRs are needed to add to oa->rtr table */
- // ((rt->options & OPT_RT_V) || (rt->options & OPT_RT_E))
-
- nf.type = RTS_OSPF;
- nf.options = rt->options;
- nf.metric1 = act->dist;
- nf.metric2 = LSINFINITY;
- nf.tag = 0;
- nf.oa = oa;
- nf.ar = act;
- nf.nh = act->nh;
- nf.ifa = act->nhi;
- nf.rid = act->lsa.rt;
- ri_install(po, ipa_from_rid(act->lsa.rt), MAX_PREFIX_LENGTH, ORT_ROUTER, &nf, NULL);
+ /*
+ * In OSPFv3, all routers are added to per-area routing
+ * tables. But we use it just for ASBRs and ABRs. For the
+ * purpose of the last step in SPF - prefix-LSA processing in
+ * process_prefixes(), we use information stored in LSA db.
+ */
+ if ((rt->options & OPT_RT_E) || (rt->options & OPT_RT_B))
+ {
+ orta nf = {
+ .type = RTS_OSPF,
+ .options = rt->options,
+ .metric1 = act->dist,
+ .metric2 = LSINFINITY,
+ .tag = 0,
+ .rid = act->lsa.rt,
+ .oa = oa,
+ .ifa = act->nhi,
+ .nh = act->nh
+ };
+ ri_install_rt(oa, act->lsa.rt, &nf);
+ }
#ifdef OSPFv2
ospf_rt_spfa_rtlinks(oa, act, act);
#ifdef OSPFv3
process_prefixes(oa);
#endif
-
- /* Find new/lost VLINK peers */
- WALK_LIST(iface, po->iface_list)
- {
- if ((iface->type == OSPF_IT_VLINK) && (iface->voa == oa))
- {
- 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->vifa != tmp->nhi) || (!ipa_equal(iface->vip, tmp->lb)))
- {
- OSPF_TRACE(D_EVENTS, "Vlink peer %R found", tmp->lsa.id);
- ospf_iface_sm(iface, ISM_DOWN);
- iface->vifa = tmp->nhi;
- iface->iface = tmp->nhi->iface;
- iface->addr = tmp->nhi->addr;
- iface->sk = tmp->nhi->sk;
- iface->vip = tmp->lb;
- ospf_iface_sm(iface, ISM_UP);
- }
- }
- else
- {
- if (iface->state > OSPF_IS_DOWN)
- {
- OSPF_TRACE(D_EVENTS, "Vlink peer %R lost", iface->vid);
- ospf_iface_sm(iface, ISM_DOWN);
- }
- }
- }
- }
}
static int
if (!en || !par) return 0;
- // FIXME lb should be properly set for vlinks */
+ /* In OSPFv2, en->lb is set here. In OSPFv3, en->lb is just cleared here,
+ it is set in process_prefixes() to any global addres in the area */
+
en->lb = IPA_NONE;
#ifdef OSPFv3
en->lb_id = 0;
return 0;
}
-/* 16.3 examining summary-LSAs in transit areas */
+
+/* RFC 2328 16.2. calculating inter-area routes */
static void
-ospf_rt_sum_tr(struct ospf_area *oa)
+ospf_rt_sum(struct ospf_area *oa)
{
- // struct proto *p = &oa->po->proto;
struct proto_ospf *po = oa->po;
- struct ospf_area *bb = po->backbone;
- ip_addr ip, abrip;
+ struct proto *p = &po->proto;
struct top_hash_entry *en;
- u32 dst_rid, metric, options;
+ ip_addr ip = IPA_NONE;
+ u32 dst_rid = 0;
+ u32 metric, options;
+ struct area_net *anet;
+ ort *abr;
int pxlen = -1, type = -1;
- ort *re = NULL, *abr;
- orta nf;
- if (!bb) return;
+ OSPF_TRACE(D_EVENTS, "Starting routing table calculation for inter-area (area %R)", oa->areaid);
WALK_SLIST(en, po->lsal)
{
if (en->domain != oa->areaid)
continue;
- /* 16.3 (1a) */
+ /* 16.2. (1a) */
if (en->lsa.age == LSA_MAXAGE)
continue;
- // if (en->dist == LSINFINITY)
- // continue;
-
- /* 16.3 (2) */
+ /* 16.2. (2) */
if (en->lsa.rt == po->router_id)
continue;
+
if (en->lsa.type == LSA_T_SUM_NET)
{
+ struct ospf_area *oaa;
+ int skip = 0;
+
#ifdef OSPFv2
struct ospf_lsa_sum *ls = en->lsa_body;
pxlen = ipa_mklen(ls->netmask);
metric = ls->metric & METRIC_MASK;
options = 0;
type = ORT_NET;
- re = fib_find(&po->rtf, &ip, pxlen);
+
+ /* 16.2. (3) */
+ WALK_LIST(oaa, po->area_list)
+ {
+ if ((anet = fib_find(&oaa->net_fib, &ip, pxlen)) && anet->active)
+ {
+ skip = 1;
+ break;
+ }
+ }
+ if (skip)
+ continue;
}
- else // en->lsa.type == LSA_T_SUM_RT
+ else /* LSA_T_SUM_RT */
{
#ifdef OSPFv2
struct ospf_lsa_sum *ls = en->lsa_body;
options = ls->options & OPTIONS_MASK;
#endif
- ip = ipa_from_rid(dst_rid);
- pxlen = MAX_PREFIX_LENGTH;
metric = ls->metric & METRIC_MASK;
options |= ORTA_ASBR;
type = ORT_ROUTER;
- re = fib_find(&bb->rtr, &ip, pxlen);
}
- /* 16.3 (1b) */
- if (metric == LSINFINITY)
- continue;
+ /* 16.2. (1b) */
+ if (metric == LSINFINITY)
+ continue;
- /* 16.3 (3) */
- if (!re || !re->n.type) continue;
- if (re->n.oa->areaid != 0) continue;
- if ((re->n.type != RTS_OSPF) && (re->n.type != RTS_OSPF_IA)) continue;
+ /* 16.2. (4) */
+ ip_addr abrip = ipa_from_rid(en->lsa.rt);
+ abr = (ort *) fib_find(&oa->rtr, &abrip, MAX_PREFIX_LENGTH);
+ if (!abr || !abr->n.type)
+ continue;
- /* 16.3. (4) */
- abrip = ipa_from_rid(en->lsa.rt);
- abr = fib_find(&oa->rtr, &abrip, MAX_PREFIX_LENGTH);
- if (!abr || !abr->n.type) continue;
-
- nf.type = re->n.type;
- nf.options = options;
- nf.metric1 = abr->n.metric1 + metric;
- nf.metric2 = LSINFINITY;
- nf.tag = 0;
- nf.oa = oa;
- nf.ar = abr->n.ar;
- nf.nh = abr->n.nh;
- nf.ifa = abr->n.ifa;
- nf.rid = en->lsa.rt; /* ABR ID */
- ri_install(po, ip, pxlen, type, &nf, NULL);
+ if (abr->n.metric1 == LSINFINITY)
+ continue;
+
+ if (!(abr->n.options & ORTA_ABR))
+ continue;
+
+ /* 16.2. (5) */
+ orta nf = {
+ .type = RTS_OSPF_IA,
+ .options = options,
+ .metric1 = abr->n.metric1 + metric,
+ .metric2 = LSINFINITY,
+ .tag = 0,
+ .rid = en->lsa.rt, /* ABR ID */
+ .oa = oa,
+ .ifa = abr->n.ifa,
+ .nh = abr->n.nh
+ };
+
+ if (type == ORT_NET)
+ ri_install_net(po, ip, pxlen, &nf);
+ else
+ ri_install_rt(oa, dst_rid, &nf);
}
}
-
-/* 16.2 calculating inter-area routes */
+
+/* RFC 2328 16.3. examining summary-LSAs in transit areas */
static void
-ospf_rt_sum(struct ospf_area *oa)
+ospf_rt_sum_tr(struct ospf_area *oa)
{
+ // struct proto *p = &oa->po->proto;
struct proto_ospf *po = oa->po;
- struct proto *p = &po->proto;
+ struct ospf_area *bb = po->backbone;
+ ip_addr ip, abrip;
struct top_hash_entry *en;
- ip_addr ip, abrip; /* abrIP is actually ID */
u32 dst_rid, metric, options;
- struct area_net *anet;
- orta nf;
- ort *abr;
int pxlen = -1, type = -1;
+ ort *re = NULL, *abr;
- OSPF_TRACE(D_EVENTS, "Starting routing table calculation for inter-area (area %R)", oa->areaid);
+
+ if (!bb) return;
WALK_SLIST(en, po->lsal)
{
if (en->domain != oa->areaid)
continue;
- /* Page 169 (1) */
+ /* 16.3 (1a) */
if (en->lsa.age == LSA_MAXAGE)
continue;
- /* Page 169 (2) */
+ /* 16.3 (2) */
if (en->lsa.rt == po->router_id)
continue;
-
if (en->lsa.type == LSA_T_SUM_NET)
{
- struct ospf_area *oaa;
- int skip = 0;
-
#ifdef OSPFv2
struct ospf_lsa_sum *ls = en->lsa_body;
pxlen = ipa_mklen(ls->netmask);
metric = ls->metric & METRIC_MASK;
options = 0;
type = ORT_NET;
-
- /* Page 169 (3) */
- WALK_LIST(oaa, po->area_list)
- {
- if ((anet = fib_find(&oaa->net_fib, &ip, pxlen)) && anet->active)
- {
- skip = 1;
- break;
- }
- }
- if (skip) continue;
+ re = fib_find(&po->rtf, &ip, pxlen);
}
- else
+ else // en->lsa.type == LSA_T_SUM_RT
{
#ifdef OSPFv2
struct ospf_lsa_sum *ls = en->lsa_body;
metric = ls->metric & METRIC_MASK;
options |= ORTA_ASBR;
type = ORT_ROUTER;
+ re = fib_find(&bb->rtr, &ip, pxlen);
}
- /* Page 169 (1) */
- if (metric == LSINFINITY)
- continue;
-
- /* Page 169 (4) */
- abrip = ipa_from_rid(en->lsa.rt);
-
- abr = (ort *) fib_find(&oa->rtr, &abrip, MAX_PREFIX_LENGTH);
- if (!abr || !abr->n.type) continue;
- if (abr->n.metric1 == LSINFINITY) continue;
- if (!(abr->n.options & ORTA_ABR)) continue;
-
- nf.type = RTS_OSPF_IA;
- nf.options = options;
- nf.metric1 = abr->n.metric1 + metric;
- nf.metric2 = LSINFINITY;
- nf.tag = 0;
- nf.oa = oa;
- nf.ar = abr->n.ar;
- nf.nh = abr->n.nh;
- nf.ifa = abr->n.ifa;
- nf.rid = en->lsa.rt; /* ABR ID */
- ri_install(po, ip, pxlen, type, &nf, NULL);
- }
-}
-
-/**
- * ospf_rt_spf - calculate internal routes
- * @po: OSPF protocol
- *
- * Calculation of internal paths in an area is described in 16.1 of RFC 2328.
- * It's based on Dijkstra's shortest path tree algorithms.
- * This function is invoked from ospf_disp().
- */
-void
-ospf_rt_spf(struct proto_ospf *po)
-{
- struct proto *p = &po->proto;
- struct ospf_area *oa;
- ort *ri;
- struct area_net *anet;
-
- if (po->areano == 0) return;
+ /* 16.3 (1b) */
+ if (metric == LSINFINITY)
+ continue;
- po->cleanup = 1;
+ /* 16.3 (3) */
+ if (!re || !re->n.type)
+ continue;
- OSPF_TRACE(D_EVENTS, "Starting routing table calculation");
+ if (re->n.oa->areaid != 0)
+ continue;
- /* 16. (1) - Invalidate old routing table */
- FIB_WALK(&po->rtf, nftmp)
- {
- ri = (ort *) nftmp;
- memcpy(&ri->o, &ri->n, sizeof(orta)); /* Backup old data */
- fill_ri(&ri->n);
- }
- FIB_WALK_END;
+ if ((re->n.type != RTS_OSPF) && (re->n.type != RTS_OSPF_IA))
+ continue;
+ /* 16.3. (4) */
+ abrip = ipa_from_rid(en->lsa.rt);
+ abr = fib_find(&oa->rtr, &abrip, MAX_PREFIX_LENGTH);
+ if (!abr || !abr->n.type)
+ continue;
- WALK_LIST(oa, po->area_list)
- {
- FIB_WALK(&oa->rtr, nftmp)
- {
- ri = (ort *) nftmp;
- memcpy(&ri->o, &ri->n, sizeof(orta)); /* Backup old data */
- fill_ri(&ri->n);
- }
- FIB_WALK_END;
+ metric = abr->n.metric1 + metric; /* IAC */
- FIB_WALK(&oa->net_fib, nftmp)
+ /* 16.3. (5) */
+ if (metric <= re->n.metric1)
{
- anet = (struct area_net *) nftmp;
- anet->active = 0;
- anet->metric = 1;
+ /* We want to replace the next-hop even if the metric is equal
+ to replace a virtual next-hop through vlink with a real one */
+ re->n.metric1 = metric;
+ re->n.nh = abr->n.nh;
+ re->n.ifa = abr->n.ifa;
}
- FIB_WALK_END;
-
- /* 16. (2) */
- ospf_rt_spfa(oa);
- }
-
- /* 16. (3) */
- if ((po->areano == 1) || (!po->backbone))
- {
- ospf_rt_sum(HEAD(po->area_list));
- }
- else
- {
- ospf_rt_sum(po->backbone);
}
+}
- /* 16. (4) */
- WALK_LIST(oa, po->area_list)
+/* RFC 2328 G.3 - incomplete resolution of virtual next hops */
+static void
+ospf_cleanup_vlinks(struct proto_ospf *po)
+{
+ FIB_WALK(&po->rtf, nftmp)
{
- if (oa->trcap && (oa->areaid != 0))
- {
- ospf_rt_sum_tr(oa);
- break;
- }
+ ort *nf = (ort *) nftmp;
+ if (nf->n.type && (nf->n.ifa->type == OSPF_IT_VLINK))
+ fill_ri(&nf->n);
}
-
- /* 16. (5) */
- ospf_ext_spf(po);
-
- rt_sync(po);
-
- po->calcrt = 0;
+ FIB_WALK_END;
}
/**
static void
ospf_ext_spf(struct proto_ospf *po)
{
- ort *nf1, *nf2, *nfh;
+ ort *nf1, *nf2;
orta nfa;
struct top_hash_entry *en;
struct proto *p = &po->proto;
ip_addr ip, nh, rtid, rt_fwaddr;
struct ospf_iface *nhi = NULL;
u32 br_metric, rt_metric, rt_tag;
- neighbor *nn;
struct ospf_area *atmp;
OSPF_TRACE(D_EVENTS, "Starting routing table calculation for ext routes");
/* 16.4. (1) */
if (en->lsa.type != LSA_T_EXT)
continue;
+
if (en->lsa.age == LSA_MAXAGE)
continue;
nf1 = NULL;
WALK_LIST(atmp, po->area_list)
{
- nfh = fib_find(&atmp->rtr, &rtid, MAX_PREFIX_LENGTH);
- if (!nfh || !nfh->n.type) continue;
- if (nf1 == NULL) nf1 = nfh;
- else if (ri_better(po, &nfh->n, NULL, &nf1->n, NULL, po->rfc1583)) nf1 = nfh;
+ ort *nfh = fib_find(&atmp->rtr, &rtid, MAX_PREFIX_LENGTH);
+ if (!nfh || !nfh->n.type)
+ continue;
+
+ if (nfh->n.metric1 == LSINFINITY)
+ continue;
+
+ if (!nf1 || ri_better_asbr(po, &nfh->n, &nf1->n))
+ nf1 = nfh;
}
if (!nf1)
continue; /* No AS boundary router found */
- if (nf1->n.metric1 == LSINFINITY)
- continue; /* distance is INF */
-
if (!(nf1->n.options & ORTA_ASBR))
continue; /* It is not ASBR */
if (!rt_fwaddr_valid)
{
+ nf2 = nf1;
nh = nf1->n.nh;
nhi = nf1->n.ifa;
- nfh = nf1;
br_metric = nf1->n.metric1;
}
else
{
+ /* FIXME: what about more specific dummy route? */
nf2 = fib_route(&po->rtf, rt_fwaddr, MAX_PREFIX_LENGTH);
-
- if (!nf2)
- {
- DBG("Cannot find network route (GW=%I)\n", rt_fwaddr);
+ if (!nf2) /* nf2->n.type is checked later */
continue;
- }
- if ((nn = neigh_find(p, &rt_fwaddr, 0)) != NULL)
- {
- nh = rt_fwaddr;
- nhi = ospf_iface_find(po, nn->iface);
- }
- else
- {
- nh = nf2->n.nh;
- nhi = nf2->n.ifa;
- }
+ if (nf2->n.metric1 == LSINFINITY)
+ continue;
+
+ if ((nf2->n.type != RTS_OSPF) && (nf2->n.type != RTS_OSPF_IA))
+ continue;
+ /* If nh is zero, it is a device route */
+ nh = ipa_nonzero(nf2->n.nh) ? nf2->n.nh : rt_fwaddr;
+ nhi = nf2->n.ifa;
br_metric = nf2->n.metric1;
- if (br_metric == LSINFINITY)
- continue; /* distance is INF */
}
if (ebit)
nfa.metric2 = LSINFINITY;
}
- nfa.options = 0;
+ /* Whether the route is preferred in route selection according to 16.4.1 */
+ nfa.options = epath_preferred(&nf2->n) ? ORTA_PREF : 0;
+
nfa.tag = rt_tag;
- nfa.oa = (po->backbone == NULL) ? HEAD(po->area_list) : po->backbone;
- nfa.ar = nf1->n.ar;
- nfa.nh = nh;
- nfa.ifa = nhi;
nfa.rid = en->lsa.rt;
- ri_install(po, ip, pxlen, ORT_NET, &nfa, nfh);
+ nfa.oa = nf1->n.oa; /* undefined in RFC 2328 */
+ nfa.ifa = nhi;
+ nfa.nh = nh;
+
+ ri_install_ext(po, ip, pxlen, &nfa);
+ }
+}
+
+/* RFC 2328 16.7. p2 - find new/lost vlink endpoints */
+static void
+ospf_check_vlinks(struct proto_ospf *po)
+{
+ struct proto *p = &po->proto;
+
+ struct ospf_iface *iface;
+ WALK_LIST(iface, po->iface_list)
+ {
+ if (iface->type == OSPF_IT_VLINK)
+ {
+ struct top_hash_entry *tmp;
+ tmp = ospf_hash_find_rt(po->gr, iface->voa->areaid, iface->vid);
+
+ if (tmp && (tmp->color == INSPF)
+ && (tmp->dist < LSINFINITY)
+ && ipa_nonzero(tmp->lb))
+ {
+ if ((iface->state != OSPF_IS_PTP)
+ || (iface->vifa != tmp->nhi)
+ || !ipa_equal(iface->vip, tmp->lb))
+ {
+ OSPF_TRACE(D_EVENTS, "Vlink peer %R found", tmp->lsa.id);
+ ospf_iface_sm(iface, ISM_DOWN);
+ iface->vifa = tmp->nhi;
+ iface->iface = tmp->nhi->iface;
+ iface->addr = tmp->nhi->addr;
+ iface->sk = tmp->nhi->sk;
+ iface->cost = tmp->dist;
+ iface->vip = tmp->lb;
+ ospf_iface_sm(iface, ISM_UP);
+ }
+ else if ((iface->state == OSPF_IS_PTP) && (iface->cost != tmp->dist))
+ {
+ iface->cost = tmp->dist;
+ schedule_rt_lsa(po->backbone);
+ }
+ }
+ else
+ {
+ if (iface->state > OSPF_IS_DOWN)
+ {
+ OSPF_TRACE(D_EVENTS, "Vlink peer %R lost", iface->vid);
+ ospf_iface_sm(iface, ISM_DOWN);
+ }
+ }
+ }
+ }
+}
+/**
+ * ospf_rt_spf - calculate internal routes
+ * @po: OSPF protocol
+ *
+ * Calculation of internal paths in an area is described in 16.1 of RFC 2328.
+ * It's based on Dijkstra's shortest path tree algorithms.
+ * This function is invoked from ospf_disp().
+ */
+void
+ospf_rt_spf(struct proto_ospf *po)
+{
+ struct proto *p = &po->proto;
+ struct ospf_area *oa;
+ ort *ri;
+ struct area_net *anet;
+
+ if (po->areano == 0) return;
+
+ po->cleanup = 1;
+
+ OSPF_TRACE(D_EVENTS, "Starting routing table calculation");
+
+ /* 16. (1) - Invalidate old routing table */
+ FIB_WALK(&po->rtf, nftmp)
+ {
+ ri = (ort *) nftmp;
+ memcpy(&ri->o, &ri->n, sizeof(orta)); /* Backup old data */
+ fill_ri(&ri->n);
}
+ FIB_WALK_END;
+
+
+ WALK_LIST(oa, po->area_list)
+ {
+ FIB_WALK(&oa->rtr, nftmp)
+ {
+ ri = (ort *) nftmp;
+ memcpy(&ri->o, &ri->n, sizeof(orta)); /* Backup old data */
+ fill_ri(&ri->n);
+ }
+ FIB_WALK_END;
+
+ FIB_WALK(&oa->net_fib, nftmp)
+ {
+ anet = (struct area_net *) nftmp;
+ anet->active = 0;
+ anet->metric = 1;
+ }
+ FIB_WALK_END;
+
+ /* 16. (2) */
+ ospf_rt_spfa(oa);
+ }
+
+ /* 16. (3) */
+ if ((po->areano == 1) || (!po->backbone))
+ ospf_rt_sum(HEAD(po->area_list));
+ else
+ ospf_rt_sum(po->backbone);
+
+ /* 16. (4) */
+ WALK_LIST(oa, po->area_list)
+ if (oa->trcap && (oa->areaid != 0))
+ ospf_rt_sum_tr(oa);
+
+ /* G.3 */
+ if (po->backbone && po->backbone->rt &&
+ (((struct ospf_lsa_rt *) po->backbone->rt->lsa_body)->options & OPT_RT_V))
+ ospf_cleanup_vlinks(po);
+
+ /* 16. (5) */
+ ospf_ext_spf(po);
+
+ rt_sync(po);
+ po->calcrt = 0;
}
/* Add LSA into list of candidates in Dijkstra's algorithm */
if (dist >= en->dist)
return;
/*
- * FIXME The line above (=) is not a bug, but we don't support multiple
+ * The line above (=) is not a bug, but we don't support multiple
* next hops. I'll start as soon as nest will
*/
*/
neigh = NULL;
WALK_LIST(ifa, po->iface_list)
- if (ifa->type == OSPF_IT_PTP)
+ if ((ifa->type == OSPF_IT_PTP) || (ifa->type == OSPF_IT_VLINK))
{
m = find_neigh(ifa, rid);
if (m && (m->state == NEIGHBOR_FULL))
struct top_hash_entry *llsa;
llsa = ospf_hash_find(po->gr, par->nhi->iface->index, en->lb_id, rid, LSA_T_LINK);
- if (!llsa)
+ if (!llsa || ipa_zero(llsa->lladdr))
return 0;
en->nh = llsa->lladdr;
check_sum_lsa(po, nf, ORT_NET);
if (reload || memcmp(&nf->n, &nf->o, sizeof(orta)))
{ /* Some difference */
- net *ne;
- rta a0;
- rte *e;
-
- bzero(&a0, sizeof(a0));
-
- a0.proto = p;
- a0.source = nf->n.type;
- a0.scope = SCOPE_UNIVERSE;
- a0.cast = RTC_UNICAST;
- a0.dest = RTD_ROUTER;
- a0.flags = 0;
- a0.aflags = 0;
- a0.iface = NULL;
- if (nf->n.ifa) a0.iface = nf->n.ifa->iface;
- a0.gw = nf->n.nh;
-
- if (ipa_nonzero(nf->n.nh) && (!neigh_find2(p, &nf->n.nh, nf->n.ifa->iface, 0)))
- {
- int found = 0;
- struct ospf_iface *ifa;
- struct top_hash_entry *en;
- OSPF_TRACE(D_EVENTS, "Trying to find correct next hop %I/%d via %I", nf->fn.prefix, nf->fn.pxlen, nf->n.nh);
- WALK_LIST(ifa, po->iface_list)
- {
- if ((ifa->type == OSPF_IT_VLINK) && ipa_equal(ifa->vip, nf->n.nh))
- {
- 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;
- }
- break;
- }
- }
- if (!found) nf->n.metric1 = LSINFINITY; /* Delete it */
- }
+ net *ne = net_get(p->table, nf->fn.prefix, nf->fn.pxlen);
+
+ rta a0 = {
+ .proto = p,
+ .source = nf->n.type,
+ .scope = SCOPE_UNIVERSE,
+ .cast = RTC_UNICAST
+ };
- if (ipa_equal(nf->n.nh, IPA_NONE)) a0.dest = RTD_DEVICE;
+ if (!nf->n.type)
+ goto remove1;
- if (!a0.iface) /* Still no match? Can this really happen? */
- nf->n.metric1 = LSINFINITY;
+ /* The distance is unreachable (or farther) */
+ if (nf->n.metric1 >= LSINFINITY)
+ goto remove1;
- ne = net_get(p->table, nf->fn.prefix, nf->fn.pxlen);
- if (nf->n.metric1 < LSINFINITY)
+ a0.iface = nf->n.ifa->iface;
+ if (ipa_nonzero(nf->n.nh))
{
- e = rte_get_temp(&a0);
- e->u.ospf.metric1 = nf->n.metric1;
- e->u.ospf.metric2 = nf->n.metric2;
- e->u.ospf.tag = nf->n.tag;
- e->u.ospf.router_id = nf->n.rid;
- e->pflags = 0;
- e->net = ne;
- e->pref = p->preference;
- DBG("Mod rte type %d - %I/%d via %I on iface %s, met %d\n",
- a0.source, nf->fn.prefix, nf->fn.pxlen, a0.gw, a0.iface ? a0.iface->name : "(none)", nf->n.metric1);
- rte_update(p->table, ne, p, p, e);
+ neighbor *ng;
+ a0.dest = RTD_ROUTER;
+ a0.gw = nf->n.nh;
+
+ ng = neigh_find2(p, &a0.gw, a0.iface, 0);
+ if (!ng || (ng->scope == SCOPE_HOST))
+ goto remove1;
}
else
- {
- rte_update(p->table, ne, p, p, NULL);
- FIB_ITERATE_PUT(&fit, nftmp);
- fib_delete(fib, nftmp);
- goto again1;
- }
+ a0.dest = RTD_DEVICE;
+
+ /* Add the route */
+ rte *e = rte_get_temp(&a0);
+ e->u.ospf.metric1 = nf->n.metric1;
+ e->u.ospf.metric2 = nf->n.metric2;
+ e->u.ospf.tag = nf->n.tag;
+ e->u.ospf.router_id = nf->n.rid;
+ e->pflags = 0;
+ e->net = ne;
+ e->pref = p->preference;
+ DBG("Mod rte type %d - %I/%d via %I on iface %s, met %d\n",
+ a0.source, nf->fn.prefix, nf->fn.pxlen, a0.gw, a0.iface ? a0.iface->name : "(none)", nf->n.metric1);
+ rte_update(p->table, ne, p, p, e);
+ goto cont1;
+
+ remove1:
+ /* Remove the route */
+ rte_update(p->table, ne, p, p, NULL);
+ FIB_ITERATE_PUT(&fit, nftmp);
+ fib_delete(fib, nftmp);
+ goto again1;
}
}
+ cont1:
FIB_ITERATE_END(nftmp);
+ ospf_check_vlinks(po);
+
WALK_LIST(oa, po->area_list)
{
FIB_ITERATE_INIT(&fit, &oa->rtr);
{
int fl = flush;
- if (oaa == oa) continue;
+ if (oaa == oa)
+ continue;
if ((oa == po->backbone) && oaa->trcap) fl = 1;
projects / thirdparty / bird.git / commitdiff
