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https://gitlab.nic.cz/labs/bird.git
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A simplification of the next-hop calculation.
Thanks to Joakim Tjernlund for the idea.
This commit is contained in:
Ondrej Zajicek
parent
919f5411c4
commit
e7b4948cbd
@ -197,6 +197,13 @@ ospf_iface_down(struct ospf_iface *ifa)
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ifa->cost = 0;
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ifa->vip = IPA_NONE;
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}
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ifa->rt_pos_beg = 0;
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ifa->rt_pos_end = 0;
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#ifdef OSPFv3
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ifa->px_pos_beg = 0;
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ifa->px_pos_end = 0;
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#endif
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}
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@ -195,8 +195,13 @@ struct ospf_iface
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ip_addr bdrip; /* Backup DR */
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u32 drid;
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u32 bdrid;
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s16 rt_pos_beg; /* Position of iface in Router-LSA, begin, inclusive */
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s16 rt_pos_end; /* Position of iface in Router-LSA, end, exclusive */
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#ifdef OSPFv3
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s16 px_pos_beg; /* Position of iface in Rt Prefix-LSA, begin, inclusive */
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s16 px_pos_end; /* Position of iface in Rt Prefix-LSA, end, exclusive */
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u32 dr_iface_id; /* if drid is valid, this is iface_id of DR (for connecting network) */
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u8 instance_id; /* Used to differentiate between more OSPF
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instances on one interface */
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126
proto/ospf/rt.c
126
proto/ospf/rt.c
@ -10,7 +10,7 @@
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static void add_cand(list * l, struct top_hash_entry *en,
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struct top_hash_entry *par, u32 dist,
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struct ospf_area *oa, struct ospf_lsa_rt_link *rtl);
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struct ospf_area *oa, int i);
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static void rt_sync(struct proto_ospf *po);
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/* In ospf_area->rtr we store paths to routers, but we use RID (and not IP address)
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@ -208,48 +208,31 @@ ri_install_ext(struct proto_ospf *po, ip_addr prefix, int pxlen, orta *new)
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memcpy(&old->n, new, sizeof(orta));
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}
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#ifdef OSPFv2
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static struct ospf_iface *
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find_stub_src(struct ospf_area *oa, ip_addr px, int pxlen)
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static inline struct ospf_iface *
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rt_pos_to_ifa(struct ospf_area *oa, int pos)
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{
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struct ospf_iface *iff;
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WALK_LIST(iff, oa->po->iface_list)
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if ((iff->type != OSPF_IT_VLINK) &&
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(iff->oa == oa) &&
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ipa_equal(iff->addr->prefix, px) &&
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(iff->addr->pxlen == pxlen))
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return iff;
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struct ospf_iface *ifa;
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WALK_LIST(ifa, oa->po->iface_list)
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if (pos >= ifa->rt_pos_beg && pos < ifa->rt_pos_end)
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return ifa;
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return NULL;
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}
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#else /* OSPFv3 */
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static struct ospf_iface *
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find_stub_src(struct ospf_area *oa, ip_addr px, int pxlen)
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#ifdef OSPFv3
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static inline struct ospf_iface *
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px_pos_to_ifa(struct ospf_area *oa, int pos)
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{
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struct ospf_iface *iff;
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struct ifa *a;
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WALK_LIST(iff, oa->po->iface_list)
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if ((iff->type != OSPF_IT_VLINK) &&
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(iff->oa == oa))
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WALK_LIST(a, iff->iface->addrs)
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if (ipa_equal(a->prefix, px) &&
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(a->pxlen == pxlen) &&
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!(a->flags & IA_SECONDARY))
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return iff;
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struct ospf_iface *ifa;
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WALK_LIST(ifa, oa->po->iface_list)
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if (pos >= ifa->px_pos_beg && pos < ifa->px_pos_end)
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return ifa;
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return NULL;
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}
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#endif
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static void
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add_network(struct ospf_area *oa, ip_addr px, int pxlen, int metric, struct top_hash_entry *en)
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add_network(struct ospf_area *oa, ip_addr px, int pxlen, int metric, struct top_hash_entry *en, int pos)
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{
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orta nf = {
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.type = RTS_OSPF,
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@ -272,7 +255,13 @@ add_network(struct ospf_area *oa, ip_addr px, int pxlen, int metric, struct top_
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* be removed in rt_sync().
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*/
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struct ospf_iface *ifa = find_stub_src(oa, px, pxlen);
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struct ospf_iface *ifa;
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#ifdef OSPFv2
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ifa = rt_pos_to_ifa(oa, pos);
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#else /* OSPFv3 */
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ifa = px_pos_to_ifa(oa, pos);
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#endif
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nf.nhs = ifa ? new_nexthop(oa->po, IPA_NONE, ifa->iface, ifa->ecmp_weight) : NULL;
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}
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@ -335,7 +324,7 @@ process_prefixes(struct ospf_area *oa)
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if ((pxopts & OPT_PX_LA) && ipa_zero(src->lb))
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src->lb = pxa;
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add_network(oa, pxa, pxlen, src->dist + metric, src);
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add_network(oa, pxa, pxlen, src->dist + metric, src, i);
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}
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}
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}
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@ -347,7 +336,7 @@ ospf_rt_spfa_rtlinks(struct ospf_area *oa, struct top_hash_entry *act, struct to
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{
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// struct proto *p = &oa->po->proto;
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struct proto_ospf *po = oa->po;
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u32 i;
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int i;
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struct ospf_lsa_rt *rt = en->lsa_body;
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struct ospf_lsa_rt_link *rr = (struct ospf_lsa_rt_link *) (rt + 1);
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@ -370,7 +359,7 @@ ospf_rt_spfa_rtlinks(struct ospf_area *oa, struct top_hash_entry *act, struct to
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*/
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add_network(oa, ipa_from_u32(rtl->id),
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ipa_mklen(ipa_from_u32(rtl->data)),
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act->dist + rtl->metric, act);
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act->dist + rtl->metric, act, i);
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break;
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#endif
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@ -396,7 +385,7 @@ ospf_rt_spfa_rtlinks(struct ospf_area *oa, struct top_hash_entry *act, struct to
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if (tmp)
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DBG("Going to add cand, Mydist: %u, Req: %u\n",
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tmp->dist, act->dist + rtl->metric);
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add_cand(&oa->cand, tmp, act, act->dist + rtl->metric, oa, rtl);
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add_cand(&oa->cand, tmp, act, act->dist + rtl->metric, oa, i);
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}
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}
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@ -482,7 +471,7 @@ ospf_rt_spfa(struct ospf_area *oa)
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#ifdef OSPFv2
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add_network(oa, ipa_and(ipa_from_u32(act->lsa.id), ln->netmask),
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ipa_mklen(ln->netmask), act->dist, act);
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ipa_mklen(ln->netmask), act->dist, act, -1);
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#endif
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rts = (u32 *) (ln + 1);
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@ -494,7 +483,7 @@ ospf_rt_spfa(struct ospf_area *oa)
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DBG("Found :-)\n");
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else
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DBG("Not found!\n");
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add_cand(&oa->cand, tmp, act, act->dist, oa, NULL);
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add_cand(&oa->cand, tmp, act, act->dist, oa, -1);
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}
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break;
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}
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@ -1326,31 +1315,6 @@ ospf_rt_spf(struct proto_ospf *po)
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}
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static inline int
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match_dr(struct ospf_iface *ifa, struct top_hash_entry *en)
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{
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#ifdef OSPFv2
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return (ifa->drid == en->lsa.rt) && (ipa_to_u32(ifa->drip) == en->lsa.id);
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#else /* OSPFv3 */
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return (ifa->drid == en->lsa.rt) && (ifa->dr_iface_id == en->lsa.id);
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#endif
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}
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static inline int
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match_rtlink(struct ospf_iface *ifa, struct ospf_lsa_rt_link *rtl)
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{
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#ifdef OSPFv2
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return ((ifa->type == OSPF_IT_PTP) || (ifa->type == OSPF_IT_PTMP)) &&
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(ifa->cost == rtl->metric) &&
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(((ifa->addr->flags & IA_UNNUMBERED) ? ifa->iface->index :
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ipa_to_u32(ifa->addr->ip)) == rtl->data);
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#else /* OSPFv3 */
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return ((ifa->type == OSPF_IT_PTP) || (ifa->type == OSPF_IT_PTMP)) &&
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(ifa->cost == rtl->metric) && (ifa->iface->index == rtl->lif);
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#endif
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}
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static inline int
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inherit_nexthops(struct mpnh *pn)
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{
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@ -1360,7 +1324,7 @@ inherit_nexthops(struct mpnh *pn)
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static struct mpnh *
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calc_next_hop(struct ospf_area *oa, struct top_hash_entry *en,
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struct top_hash_entry *par, struct ospf_lsa_rt_link *rtl)
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struct top_hash_entry *par, int pos)
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{
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// struct proto *p = &oa->po->proto;
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struct proto_ospf *po = oa->po;
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@ -1386,28 +1350,28 @@ calc_next_hop(struct ospf_area *oa, struct top_hash_entry *en,
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/* The first case - local network */
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if ((en->lsa.type == LSA_T_NET) && (par == oa->rt))
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{
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WALK_LIST(ifa, po->iface_list)
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if (match_dr(ifa, en))
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return new_nexthop(po, IPA_NONE, ifa->iface, ifa->ecmp_weight);
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ifa = rt_pos_to_ifa(oa, pos);
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if (!ifa)
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return NULL;
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return NULL;
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return new_nexthop(po, IPA_NONE, ifa->iface, ifa->ecmp_weight);
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}
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/* The second case - ptp or ptmp neighbor */
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if ((en->lsa.type == LSA_T_RT) && (par == oa->rt))
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{
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if (rtl->type == LSART_VLNK)
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ifa = rt_pos_to_ifa(oa, pos);
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if (!ifa)
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return NULL;
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if (ifa->type == OSPF_IT_VLINK)
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return new_nexthop(po, IPA_NONE, NULL, 0);
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WALK_LIST(ifa, po->iface_list)
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if (match_rtlink(ifa, rtl))
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{
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struct ospf_neighbor *m = find_neigh(ifa, rid);
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if (m && (m->state == NEIGHBOR_FULL))
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return new_nexthop(po, m->ip, ifa->iface, ifa->ecmp_weight);
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}
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struct ospf_neighbor *m = find_neigh(ifa, rid);
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if (!m || (m->state != NEIGHBOR_FULL))
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return NULL;
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return NULL;
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return new_nexthop(po, m->ip, ifa->iface, ifa->ecmp_weight);
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}
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/* The third case - bcast or nbma neighbor */
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@ -1532,7 +1496,7 @@ merge_nexthops(struct proto_ospf *po, struct top_hash_entry *en,
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/* Add LSA into list of candidates in Dijkstra's algorithm */
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static void
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add_cand(list * l, struct top_hash_entry *en, struct top_hash_entry *par,
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u32 dist, struct ospf_area *oa, struct ospf_lsa_rt_link *rtl)
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u32 dist, struct ospf_area *oa, int pos)
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{
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struct proto_ospf *po = oa->po;
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node *prev, *n;
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@ -1566,7 +1530,7 @@ add_cand(list * l, struct top_hash_entry *en, struct top_hash_entry *par,
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if (!link_back(oa, en, par))
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return;
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struct mpnh *nhs = calc_next_hop(oa, en, par, rtl);
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struct mpnh *nhs = calc_next_hop(oa, en, par, pos);
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if (!nhs)
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{
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log(L_WARN "Cannot find next hop for LSA (Type: %04x, Id: %R, Rt: %R)",
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@ -241,6 +241,8 @@ originate_rt_lsa_body(struct ospf_area *oa, u16 *length)
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if ((ifa->oa != oa) || (ifa->state == OSPF_IS_DOWN))
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continue;
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ifa->rt_pos_beg = i;
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/* RFC2328 - 12.4.1.1-4 */
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switch (ifa->type)
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{
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@ -294,6 +296,8 @@ originate_rt_lsa_body(struct ospf_area *oa, u16 *length)
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break;
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}
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ifa->rt_pos_end = i;
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/* Now we will originate stub area if there is no primary */
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if (net_lsa ||
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(ifa->type == OSPF_IT_VLINK) ||
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@ -321,6 +325,8 @@ originate_rt_lsa_body(struct ospf_area *oa, u16 *length)
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ln->padding = 0;
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}
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i++;
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ifa->rt_pos_end = i;
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}
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struct ospf_stubnet_config *sn;
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@ -367,6 +373,7 @@ originate_rt_lsa_body(struct ospf_area *oa, u16 *length)
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struct proto_ospf *po = oa->po;
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struct ospf_iface *ifa;
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int bitv = 0;
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int i = 0;
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struct ospf_lsa_rt *rt;
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struct ospf_neighbor *neigh;
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@ -396,6 +403,8 @@ originate_rt_lsa_body(struct ospf_area *oa, u16 *length)
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if ((ifa->oa != oa) || (ifa->state == OSPF_IS_DOWN))
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continue;
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ifa->rt_pos_beg = i;
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/* RFC5340 - 4.4.3.2 */
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switch (ifa->type)
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{
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@ -403,25 +412,27 @@ originate_rt_lsa_body(struct ospf_area *oa, u16 *length)
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case OSPF_IT_PTMP:
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WALK_LIST(neigh, ifa->neigh_list)
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if (neigh->state == NEIGHBOR_FULL)
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add_lsa_rt_link(po, ifa, LSART_PTP, neigh->iface_id, neigh->rid);
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add_lsa_rt_link(po, ifa, LSART_PTP, neigh->iface_id, neigh->rid), i++;
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break;
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case OSPF_IT_BCAST:
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case OSPF_IT_NBMA:
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if (bcast_net_active(ifa))
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add_lsa_rt_link(po, ifa, LSART_NET, ifa->dr_iface_id, ifa->drid);
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add_lsa_rt_link(po, ifa, LSART_NET, ifa->dr_iface_id, ifa->drid), i++;
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break;
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case OSPF_IT_VLINK:
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neigh = (struct ospf_neighbor *) HEAD(ifa->neigh_list);
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if ((!EMPTY_LIST(ifa->neigh_list)) && (neigh->state == NEIGHBOR_FULL) && (ifa->cost <= 0xffff))
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add_lsa_rt_link(po, ifa, LSART_VLNK, neigh->iface_id, neigh->rid);
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add_lsa_rt_link(po, ifa, LSART_VLNK, neigh->iface_id, neigh->rid), i++;
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break;
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default:
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log("Unknown interface type %s", ifa->iface->name);
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break;
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}
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ifa->rt_pos_end = i;
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}
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if (bitv)
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@ -1184,6 +1195,8 @@ originate_prefix_rt_lsa_body(struct ospf_area *oa, u16 *length)
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if ((ifa->oa != oa) || (ifa->state == OSPF_IS_DOWN))
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continue;
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ifa->px_pos_beg = i;
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if ((ifa->type == OSPF_IT_BCAST) ||
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(ifa->type == OSPF_IT_NBMA))
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net_lsa = bcast_net_active(ifa);
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@ -1215,6 +1228,8 @@ originate_prefix_rt_lsa_body(struct ospf_area *oa, u16 *length)
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(a->pxlen == MAX_PREFIX_LENGTH))
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host_addr = 1;
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}
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ifa->px_pos_end = i;
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}
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/* If there are some configured vlinks, add some global address,
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