mirror of
https://gitlab.nic.cz/labs/bird.git
synced 2024-12-22 09:41:54 +00:00
Better routing table calculation. We are ready to work with
multiple OSPF areas.
This commit is contained in:
Ondrej Filip
parent
b1f7229ad7
commit
1a61882d37
@ -95,10 +95,10 @@ ospf_start(struct proto *p)
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po->disp_timer->hook = ospf_disp;
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po->disp_timer->recurrent = po->tick;
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tm_start(po->disp_timer, 1);
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fib_init(&po->efib, p->pool, sizeof(struct extfib), 16, init_efib);
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init_list(&(po->iface_list));
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init_list(&(po->area_list));
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fib_init(&po->rtf[0], p->pool, sizeof(ort), 16, ospf_rt_initort);
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fib_init(&po->rtf[1], p->pool, sizeof(ort), 16, ospf_rt_initort);
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po->areano = 0;
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if (EMPTY_LIST(c->area_list))
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{
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@ -133,8 +133,6 @@ ospf_start(struct proto *p)
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antmp->hidden = anet->hidden;
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add_tail(&oa->net_list, NODE antmp);
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}
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fib_init(&oa->infib, po->proto.pool, sizeof(struct infib), 16,
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init_infib);
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}
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return PS_UP;
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}
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@ -191,6 +189,7 @@ ospf_init(struct proto_config *c)
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static int
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ospf_rte_better(struct rte *new, struct rte *old)
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{
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/* FIXME this is wrong */
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if (new->u.ospf.metric1 == LSINFINITY)
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return 0;
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@ -248,10 +248,17 @@ struct ospf_lsa_header
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struct vebb
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{
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#ifdef _BIG_ENDIAN
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u8 padding:5;
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u8 v:1;
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u8 e:1;
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u8 b:1;
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#else
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u8 b:1;
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u8 e:1;
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u8 v:1;
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u8 padding:5;
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#endif
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};
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union veb
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@ -263,9 +270,6 @@ union veb
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struct ospf_lsa_rt
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{
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union veb veb;
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#define LSA_RT_V 5
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#define LSA_RT_E 6
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#define LSA_RT_B 7
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u8 padding;
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u16 links;
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};
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@ -432,7 +436,6 @@ struct ospf_area
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int stub;
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int trcap; /* Transit capability? */
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struct proto_ospf *po;
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struct fib infib; /* FIB for intra-area routes */
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unsigned tick;
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};
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@ -445,7 +448,7 @@ struct proto_ospf
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list iface_list; /* Interfaces we really use */
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list area_list;
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int areano; /* Number of area I belong to */
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struct fib efib; /* FIB for external routes */
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struct fib rtf[2]; /* Routing tables */
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int rfc1583; /* RFC1583 compatibility */
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int ebit; /* Did I originate any ext lsa? */
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};
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671
proto/ospf/rt.c
671
proto/ospf/rt.c
@ -1,42 +1,109 @@
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/*
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* BIRD -- OSPF
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*
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* (c) 2000--2004 Ondrej Filip <feela@network.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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* BIRD -- OSPF
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*
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* (c) 2000--2004 Ondrej Filip <feela@network.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#include "ospf.h"
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static void add_cand(list * l, struct top_hash_entry *en,
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struct top_hash_entry *par, u16 dist,
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struct ospf_area *oa);
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static void calc_next_hop(struct top_hash_entry *en,
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struct top_hash_entry *par, struct ospf_area *oa);
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static void ospf_ext_spfa(struct proto_ospf *po);
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static void
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add_cand(list * l, struct top_hash_entry *en,
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struct top_hash_entry *par, u16 dist, struct ospf_area *oa);
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static void
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calc_next_hop(struct top_hash_entry *en,
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struct top_hash_entry *par, struct ospf_area *oa);
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static void ospf_ext_spfa(struct ospf_area *oa);
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static void rt_sync(struct proto_ospf *po);
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void
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init_infib(struct fib_node *fn)
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static void
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fill_ri(orta * orta)
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{
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struct infib *f = (struct infib *) fn;
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f->metric = LSINFINITY;
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f->oldmetric = LSINFINITY;
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f->en = NULL;
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f->olden = NULL;
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orta->type = RTS_DUMMY;
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orta->capa = 0;
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#define ORTA_ASBR 1
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#define ORTA_ABR 2
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orta->oa = NULL;
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orta->metric1 = LSINFINITY;
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orta->metric2 = LSINFINITY;
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orta->nh = ipa_from_u32(0);
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orta->ifa = NULL;
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orta->ar = NULL;
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orta->tag = 0;
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}
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void
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init_efib(struct fib_node *fn)
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ospf_rt_initort(struct fib_node *fn)
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{
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struct extfib *f = (struct extfib *) fn;
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ort *ri = (ort *) fn;
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fill_ri(&ri->n);
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ri->dest = ORT_UNDEF;
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memcpy(&ri->o, &ri->n, sizeof(orta));
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}
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f->metric = LSINFINITY;
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f->metric2 = LSINFINITY;
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f->nh = ipa_from_u32(0);
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f->nhi = NULL;
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f->oldmetric = LSINFINITY;
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f->oldmetric2 = LSINFINITY;
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f->oldnh = ipa_from_u32(0);
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/* If new is better return 1 */
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static int
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ri_better(struct proto_ospf *po, orta * new, orta * old)
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{
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int newtype = new->type;
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int oldtype = old->type;
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if (old->type == RTS_DUMMY)
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return 1;
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if (old->metric1 == LSINFINITY)
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return 1;
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if (po->rfc1583)
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{
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if ((newtype == RTS_OSPF) && (new->oa->areaid == 0)) newtype = RTS_OSPF_IA;
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if ((oldtype == RTS_OSPF) && (old->oa->areaid == 0)) oldtype = RTS_OSPF_IA;
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}
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if (new->type < old->type)
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return 1;
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if (new->metric2 < old->metric2)
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{
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if (old->metric2 == LSINFINITY)
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return 0; /* Old is E1, new is E2 */
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return 1; /* Both are E2 */
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}
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if (new->metric2 > old->metric2)
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{
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if (new->metric2 == LSINFINITY)
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return 1; /* New is E1, old is E2 */
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return 0; /* Both are E2 */
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}
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/*
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* E2 metrics are the same. It means that: 1) Paths are E2 with same
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* metric 2) Paths are E1.
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*/
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if (new->metric1 < old->metric1)
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return 1;
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if (new->metric1 > old->metric1)
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return 0;
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/* Metric 1 are the same */
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if (new->oa->areaid > old->oa->areaid) return 1; /* Larger AREAID is preffered */
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return 0; /* Old is shorter or same */
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}
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static void
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ri_install(struct proto_ospf *po, ip_addr prefix, int pxlen, int dest,
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orta * new)
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{
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ort *old = (ort *) fib_get(&po->rtf[dest], &prefix, pxlen);
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if (ri_better(po, new, &old->n))
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{
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memcpy(&old->n, new, sizeof(orta));
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}
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}
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/**
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@ -49,37 +116,26 @@ init_efib(struct fib_node *fn)
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* and latter parts of routing table calculation look directly into LSA
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* Database. This function is invoked from ospf_disp().
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*/
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void
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static void
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ospf_rt_spfa(struct ospf_area *oa)
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{
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u32 i, *rts;
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struct ospf_lsa_rt *rt;
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struct ospf_lsa_rt_link *rtl, *rr;
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struct fib *in = &oa->infib;
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struct infib *nf;
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struct fib_iterator fit;
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struct proto *p = &oa->po->proto;
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struct proto_ospf *po = oa->po;
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ip_addr ip;
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struct ospf_lsa_net *ln;
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OSPF_TRACE(D_EVENTS, "Starting routing table calculation for area %I",
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oa->areaid);
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orta nf;
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if (oa->rt == NULL)
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return;
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OSPF_TRACE(D_EVENTS, "Starting routing table calculation for area %I",
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oa->areaid);
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if (oa->rt->dist != LSINFINITY)
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ospf_age(oa);
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FIB_WALK(in, nftmp)
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{
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nf = (struct infib *) nftmp;
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nf->metric = LSINFINITY;
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nf->en = NULL;
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}
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FIB_WALK_END;
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init_list(&oa->cand); /* Empty list of candidates */
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oa->trcap = 0;
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@ -95,7 +151,6 @@ ospf_rt_spfa(struct ospf_area *oa)
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{
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struct top_hash_entry *act, *tmp;
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node *n;
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u16 met;
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n = HEAD(oa->cand);
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act = SKIP_BACK(struct top_hash_entry, cn, n);
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@ -111,6 +166,20 @@ ospf_rt_spfa(struct ospf_area *oa)
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rt = (struct ospf_lsa_rt *) act->lsa_body;
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if (rt->veb.bit.v)
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oa->trcap = 1;
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if (rt->veb.bit.b || rt->veb.bit.e)
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{
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nf.type = RTS_OSPF;
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nf.capa = 0;
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if (rt->veb.bit.b) nf.capa |= ORTA_ABR;
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if (rt->veb.bit.e) nf.capa |= ORTA_ASBR;
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nf.metric1 = act->dist;
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nf.metric2 = LSINFINITY;
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nf.oa = oa;
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nf.ar = act;
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nf.nh = act->nh;
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nf.ifa = act->nhi;
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ri_install(po, ipa_from_u32(act->lsa.id), 32, ORT_ROUTER, &nf);
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}
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rr = (struct ospf_lsa_rt_link *) (rt + 1);
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DBG(" Number of links: %u\n", rt->links);
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for (i = 0; i < rt->links; i++)
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@ -121,26 +190,28 @@ ospf_rt_spfa(struct ospf_area *oa)
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switch (rtl->type)
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{
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case LSART_STUB:
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/* This violates rfc2328! but I hope it's also correct. */
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/*
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* This violates rfc2328! but I hope
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* it's also correct.
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*/
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DBG("\n");
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ip = ipa_from_u32(rtl->id);
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nf = fib_get(in, &ip, ipa_mklen(ipa_from_u32(rtl->data)));
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if (nf->metric > (met = act->dist + rtl->metric))
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{
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DBG(" Adding stub route....\n");
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if (oa->rt == act)
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break;
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if (act->nhi == NULL)
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break;
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nf->metric = met;
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nf->en = act;
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DBG(" Adding stub route: %I\n", ip);
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DBG(" Next hop=%I\n", nf->en->nh);
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}
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else
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DBG(" NOT adding stub route: %I\n", ip);
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if (act == oa->rt)
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continue;
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if (!act->nhi)
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continue;
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nf.type = RTS_OSPF;
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nf.capa = 0;
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nf.metric1 = act->dist + rtl->metric;
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nf.metric2 = LSINFINITY;
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nf.oa = oa;
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nf.ar = act;
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nf.nh = act->nh;
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nf.ifa = act->nhi;
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ri_install(po, ipa_from_u32(rtl->id),
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ipa_mklen(ipa_from_u32(rtl->data)), ORT_NET, &nf);
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break;
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case LSART_VLNK:
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case LSART_VLNK: /* FIXME !!!!!!!! */
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DBG("Ignoring\n");
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continue;
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break;
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@ -167,14 +238,17 @@ ospf_rt_spfa(struct ospf_area *oa)
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break;
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case LSA_T_NET:
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ln = act->lsa_body;
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ip = ipa_and(ipa_from_u32(act->lsa.id), ln->netmask);
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nf = fib_get(in, &ip, ipa_mklen(ln->netmask));
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if (nf->metric > act->dist)
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{
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nf->metric = act->dist;
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nf->en = act;
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DBG(" Adding into routing table\n");
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}
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nf.type = RTS_OSPF;
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nf.capa = 0;
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nf.metric1 = act->dist;
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nf.metric2 = LSINFINITY;
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nf.oa = oa;
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nf.ar = act;
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nf.nh = act->nh;
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nf.ifa = act->nhi;
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ri_install(po, ipa_and(ipa_from_u32(act->lsa.id), ln->netmask),
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ipa_mklen(ln->netmask), ORT_NET, &nf);
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rts = (u32 *) (ln + 1);
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for (i = 0; i < (act->lsa.length - sizeof(struct ospf_lsa_header) -
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sizeof(struct ospf_lsa_net)) / sizeof(u32); i++)
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@ -190,104 +264,60 @@ ospf_rt_spfa(struct ospf_area *oa)
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break;
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}
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}
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/* Now sync our fib with nest's */
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DBG("Now syncing my rt table with nest's\n");
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FIB_ITERATE_INIT(&fit, in);
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again:
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FIB_ITERATE_START(in, &fit, nftmp)
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{
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nf = (struct infib *) nftmp;
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if (nf->metric == LSINFINITY)
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{
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net *ne;
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struct top_hash_entry *en = nf->en;
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ln = en->lsa_body;
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ne = net_get(p->table, nf->fn.prefix, nf->fn.pxlen);
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if ((en != NULL) && (en->nhi != NULL))
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DBG("Deleting rt entry %I\n (P: %x, GW: %I, Iface: %s)\n",
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nf->fn.prefix, en, en->nh, en->nhi->name);
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rte_update(p->table, ne, p, NULL);
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/* Now delete my fib */
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FIB_ITERATE_PUT(&fit, nftmp);
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fib_delete(in, nftmp);
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goto again;
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}
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else
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{
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/* Update routing table */
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if (ipa_equal(nf->en->nh, ipa_from_u32(0)))
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{
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struct top_hash_entry *en = nf->en;
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struct ospf_neighbor *neigh;
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neighbor *nn;
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if ((neigh = find_neigh_noifa(po, en->lsa.rt)) == NULL)
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{
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goto skip;
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}
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nn = neigh_find(p, &neigh->ip, 0);
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DBG(" Next hop calculated: %I\n", nn->addr);
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en->nh = nn->addr;
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en->nhi = nn->iface;
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}
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if ((nf->en != nf->olden) || (nf->metric != nf->oldmetric))
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{
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net *ne;
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rta a0;
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rte *e;
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struct top_hash_entry *en = nf->en;
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ln = en->lsa_body;
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bzero(&a0, sizeof(a0));
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a0.proto = p;
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a0.source = RTS_OSPF;
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a0.scope = SCOPE_UNIVERSE;
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a0.cast = RTC_UNICAST;
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if (ipa_to_u32(en->nh) == 0)
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a0.dest = RTD_DEVICE;
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else
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a0.dest = RTD_ROUTER;
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a0.flags = 0;
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a0.aflags = 0;
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a0.iface = en->nhi;
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a0.gw = en->nh;
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ne = net_get(p->table, nf->fn.prefix, nf->fn.pxlen);
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e = rte_get_temp(&a0);
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e->u.ospf.metric1 = nf->metric;
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e->u.ospf.metric2 = LSINFINITY;
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e->u.ospf.tag = 0;
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e->pflags = 0;
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e->net = ne;
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e->pref = p->preference;
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DBG("Modifying rt entry %I\n (GW: %I, Iface: %s)\n",
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nf->fn.prefix, en->nh, en->nhi->name);
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rte_update(p->table, ne, p, e);
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nf->olden = nf->en;
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nf->oldmetric = nf->metric;
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}
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}
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}
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skip:
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FIB_ITERATE_END(nftmp);
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ospf_ext_spfa(po);
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}
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void
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ospf_rt_spf(struct proto_ospf *po)
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{
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struct proto *p = &po->proto;
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struct ospf_area *oa;
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int i;
|
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ort *ri;
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|
||||
OSPF_TRACE(D_EVENTS, "Starting routing table calculation");
|
||||
|
||||
/* Invalidate old routing table */
|
||||
for (i = 0; i < 2; i++)
|
||||
FIB_WALK(&po->rtf[i], 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)
|
||||
{
|
||||
ospf_rt_spfa(oa);
|
||||
}
|
||||
|
||||
if (po->areano > 1)
|
||||
{
|
||||
//ospf_rt_sum(oa);
|
||||
}
|
||||
else
|
||||
{
|
||||
WALK_LIST(oa, po->area_list)
|
||||
{
|
||||
//if (oa->id == 0) ospf_rt_sum(oa);
|
||||
}
|
||||
|
||||
WALK_LIST(oa, po->area_list)
|
||||
{
|
||||
//if (oa->trcap == 1) ospf_rt_sum(oa);
|
||||
}
|
||||
}
|
||||
WALK_LIST(oa, po->area_list)
|
||||
{
|
||||
if (!oa->stub)
|
||||
{
|
||||
ospf_ext_spfa(oa);
|
||||
break;
|
||||
}
|
||||
}
|
||||
rt_sync(po);
|
||||
}
|
||||
|
||||
|
||||
@ -300,43 +330,25 @@ ospf_rt_spf(struct proto_ospf *po)
|
||||
* Inter- and Intra-area paths are always prefered over externals.
|
||||
*/
|
||||
static void
|
||||
ospf_ext_spfa(struct proto_ospf *po) /* FIXME looking into inter-area */
|
||||
ospf_ext_spfa(struct ospf_area *oa)
|
||||
{
|
||||
struct top_hash_entry *en, *etmp, *absr;
|
||||
struct fib *ef = &po->efib;
|
||||
struct extfib *nf;
|
||||
struct infib *inf;
|
||||
struct fib_iterator fit;
|
||||
struct ospf_area *oa = NULL, *atmp, *absroa;
|
||||
struct proto_ospf *po = oa->po;
|
||||
ort *nf1, *nf2;
|
||||
orta nfa;
|
||||
struct top_hash_entry *en;
|
||||
struct proto *p = &po->proto;
|
||||
struct ospf_lsa_ext *le;
|
||||
struct ospf_lsa_ext_tos *lt;
|
||||
int mlen;
|
||||
ip_addr ip, nnh;
|
||||
struct iface *nnhi = NULL;
|
||||
u16 met, met2;
|
||||
u32 tag;
|
||||
ip_addr ip, nh, rtid;
|
||||
struct iface *nhi = NULL;
|
||||
int met1, met2;
|
||||
neighbor *nn;
|
||||
struct ospf_lsa_rt *rt;
|
||||
|
||||
|
||||
OSPF_TRACE(D_EVENTS, "Starting routing table calculation for ext routes");
|
||||
|
||||
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)
|
||||
@ -362,214 +374,80 @@ ospf_ext_spfa(struct proto_ospf *po) /* FIXME looking into inter-area */
|
||||
p->name, en->lsa.id, en->lsa.rt, en->lsa.type, le->netmask);
|
||||
continue;
|
||||
}
|
||||
nhi = NULL;
|
||||
nh = IPA_NONE;
|
||||
|
||||
nf = NULL;
|
||||
met1 = LSINFINITY;
|
||||
met2 = LSINFINITY;
|
||||
|
||||
WALK_LIST(atmp, po->area_list)
|
||||
{
|
||||
if ((nf = fib_find(&atmp->infib, &ip, mlen)) != NULL)
|
||||
break;
|
||||
}
|
||||
rtid = ipa_from_u32(en->lsa.rt);
|
||||
|
||||
if (nf != NULL)
|
||||
continue; /* Some intra area path exists */
|
||||
if (!(nf1 = fib_find(&po->rtf[ORT_ROUTER], &rtid, 32)))
|
||||
continue; /* No AS boundary router found */
|
||||
|
||||
absr = NULL;
|
||||
absroa = NULL;
|
||||
nnhi = NULL;
|
||||
nnh = IPA_NONE;
|
||||
if (nf1->n.metric1 == LSINFINITY)
|
||||
continue; /* distance is INF */
|
||||
|
||||
met = 0;
|
||||
met2 = 0;
|
||||
tag = 0;
|
||||
|
||||
WALK_LIST(atmp, po->area_list) /*
|
||||
* Find shortest path
|
||||
* to advertising router
|
||||
*/
|
||||
{
|
||||
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;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if ((absr == NULL) || (absr->dist == LSINFINITY) ||
|
||||
(((struct ospf_lsa_rt *) (absr->lsa_body))->veb.bit.e == 0))
|
||||
{
|
||||
DBG("ASBR is null or its dist=INF\n");
|
||||
continue;
|
||||
}
|
||||
if (!(nf1->n.capa & ORTA_ASBR))
|
||||
continue; /* It is not ASBR */
|
||||
|
||||
if (ipa_compare(lt->fwaddr, ipa_from_u32(0)) == 0)
|
||||
{
|
||||
if (lt->etos > 0) /* FW address == 0 */
|
||||
{
|
||||
met = absr->dist;
|
||||
if (lt->etos > 0)
|
||||
{ /* FW address == 0 */
|
||||
met1 = nf1->n.metric1;
|
||||
met2 = lt->metric;
|
||||
}
|
||||
else
|
||||
{
|
||||
met = absr->dist + lt->metric;
|
||||
met1 = nf1->n.metric1 + lt->metric;
|
||||
met2 = LSINFINITY;
|
||||
}
|
||||
tag = lt->tag;
|
||||
nh = nf1->n.nh;
|
||||
nhi = nf1->n.ifa;
|
||||
}
|
||||
else /* FW address !=0 */
|
||||
{
|
||||
inf = NULL;
|
||||
WALK_LIST(atmp, po->area_list)
|
||||
{
|
||||
if ((inf = fib_route(&atmp->infib, lt->fwaddr, 32)) != NULL)
|
||||
{
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (inf == NULL)
|
||||
else
|
||||
{ /* FW address !=0 */
|
||||
if (!(nf2 = fib_route(&po->rtf[ORT_NET], lt->fwaddr, 32)))
|
||||
{
|
||||
DBG("Cannot find network route (GW=%I)\n", lt->fwaddr);
|
||||
continue;
|
||||
}
|
||||
|
||||
if (lt->etos > 0)
|
||||
{
|
||||
met = inf->metric;
|
||||
met1 = nf2->n.metric1;
|
||||
met2 = lt->metric;
|
||||
}
|
||||
else
|
||||
{
|
||||
met = inf->metric + lt->metric;
|
||||
met1 = nf2->n.metric1 + lt->metric;
|
||||
met2 = LSINFINITY;
|
||||
}
|
||||
tag = lt->tag;
|
||||
|
||||
if ((nn = neigh_find(p, <->fwaddr, 0)) != NULL)
|
||||
{
|
||||
nnh = lt->fwaddr;
|
||||
nnhi = nn->iface;
|
||||
nh = lt->fwaddr;
|
||||
nhi = nn->iface;
|
||||
}
|
||||
else
|
||||
{
|
||||
nnh = inf->en->nh;
|
||||
nnhi = inf->en->nhi;
|
||||
nh = nf2->n.nh;
|
||||
nhi = nf2->n.ifa;
|
||||
}
|
||||
}
|
||||
|
||||
nf = fib_get(ef, &ip, mlen);
|
||||
if ((nf->metric == LSINFINITY) || /* nf is new */
|
||||
((met < nf->metric) && (nf->metric2 == met2)) || /* both E1 or E2
|
||||
* with same metric */
|
||||
((met2 < nf->metric2) && (nf->metric2 != LSINFINITY)) || /* E2 smaller and
|
||||
* 1st is not E1 */
|
||||
((nf->metric2 != LSINFINITY) && (met2 == LSINFINITY))) /* 2nd is E1 and
|
||||
* 1st is E2 */
|
||||
{
|
||||
if (nf->metric != LSINFINITY)
|
||||
OSPF_TRACE(D_EVENTS,
|
||||
"Rewriting %I/%d met=%d, met2=%d, nmet=%d, nmet2=%d",
|
||||
ip, mlen, nf->metric, nf->metric2, met, met2);
|
||||
nf->metric = met;
|
||||
nf->metric2 = met2;
|
||||
nf->tag = tag;
|
||||
|
||||
if (nnhi != NULL)
|
||||
{
|
||||
nf->nh = nnh;
|
||||
nf->nhi = nnhi;
|
||||
}
|
||||
else
|
||||
{
|
||||
if (ipa_compare(absr->nh, ipa_from_u32(0)) == 0)
|
||||
{
|
||||
struct ospf_neighbor *neigh;
|
||||
|
||||
if ((neigh = find_neigh_noifa(po, absr->lsa.rt)) == NULL)
|
||||
{
|
||||
DBG("Cannot find neighbor\n");
|
||||
nf->metric = LSINFINITY; /* delete this route */
|
||||
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;
|
||||
}
|
||||
}
|
||||
}
|
||||
nfa.type = RTS_OSPF_EXT;
|
||||
nfa.capa = 0;
|
||||
nfa.metric1 = met1;
|
||||
nfa.metric2 = met2;
|
||||
nfa.oa = oa;
|
||||
nfa.ar = nf1->n.ar;
|
||||
nfa.nh = nh;
|
||||
nfa.ifa = nhi;
|
||||
nfa.tag = lt->tag;
|
||||
ri_install(po, ip, mlen, ORT_NET, &nfa);
|
||||
}
|
||||
|
||||
DBG("Now syncing my rt table with nest's\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
|
||||
if ((nf->metric != nf->oldmetric) || (nf->metric2 != nf->oldmetric2) ||
|
||||
(!ipa_equal(nf->nh, nf->oldnh)) || (nf->tag != nf->oldtag))
|
||||
{
|
||||
net *ne;
|
||||
rta a0;
|
||||
rte *e;
|
||||
|
||||
bzero(&a0, sizeof(a0));
|
||||
|
||||
a0.proto = p;
|
||||
a0.source = RTS_OSPF_EXT;
|
||||
a0.scope = SCOPE_UNIVERSE;
|
||||
a0.cast = RTC_UNICAST;
|
||||
a0.dest = RTD_ROUTER;
|
||||
a0.flags = 0;
|
||||
a0.aflags = 0;
|
||||
a0.iface = nf->nhi;
|
||||
a0.gw = nf->nh;
|
||||
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 = nf->tag;
|
||||
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);
|
||||
|
||||
nf->oldmetric = nf->metric;
|
||||
nf->oldmetric2 = nf->metric2;
|
||||
nf->oldnh = nf->nh;
|
||||
nf->oldtag = nf->tag;
|
||||
}
|
||||
}
|
||||
FIB_ITERATE_END(nftmp);
|
||||
}
|
||||
|
||||
/* Add LSA into list of candidates in Dijkstra's algorithm */
|
||||
@ -592,8 +470,8 @@ add_cand(list * l, struct top_hash_entry *en, struct top_hash_entry *par,
|
||||
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
|
||||
* 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);
|
||||
@ -606,11 +484,10 @@ add_cand(list * l, struct top_hash_entry *en, struct top_hash_entry *par,
|
||||
if (!en->nhi)
|
||||
return; /* We cannot find next hop, ignore it */
|
||||
|
||||
if (en->color == CANDIDATE) /* We found a shorter path */
|
||||
{
|
||||
if (en->color == CANDIDATE)
|
||||
{ /* We found a shorter path */
|
||||
rem_node(&en->cn);
|
||||
}
|
||||
|
||||
en->dist = dist;
|
||||
en->color = CANDIDATE;
|
||||
|
||||
@ -694,11 +571,11 @@ calc_next_hop(struct top_hash_entry *en, struct top_hash_entry *par,
|
||||
if ((neigh = find_neigh_noifa(po, en->lsa.rt)) == NULL)
|
||||
return;
|
||||
en->nhi = neigh->ifa->iface;
|
||||
en->nh = neigh->ip; /* Yes, neighbor is it's own next hop */
|
||||
en->nh = neigh->ip; /* Yes, neighbor is it's
|
||||
* own next hop */
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
if (par->lsa.type == LSA_T_NET)
|
||||
{
|
||||
if (en->lsa.type == LSA_T_NET)
|
||||
@ -708,11 +585,12 @@ calc_next_hop(struct top_hash_entry *en, struct top_hash_entry *par,
|
||||
if ((neigh = find_neigh_noifa(po, en->lsa.rt)) == NULL)
|
||||
return;
|
||||
en->nhi = neigh->ifa->iface;
|
||||
en->nh = neigh->ip; /* Yes, neighbor is it's own next hop */
|
||||
en->nh = neigh->ip; /* Yes, neighbor is it's own
|
||||
* next hop */
|
||||
return;
|
||||
}
|
||||
else /* Parent is some RT neighbor */
|
||||
{
|
||||
else
|
||||
{ /* Parent is some RT neighbor */
|
||||
log(L_ERR "Router's parent has no next hop. (EN=%I, PAR=%I)",
|
||||
en->lsa.id, par->lsa.id);
|
||||
/* I hoped this would never happen */
|
||||
@ -723,3 +601,64 @@ calc_next_hop(struct top_hash_entry *en, struct top_hash_entry *par,
|
||||
en->nhi = par->nhi;
|
||||
DBG(" Next hop calculated: %I.\n", en->nh);
|
||||
}
|
||||
|
||||
static void
|
||||
rt_sync(struct proto_ospf *po)
|
||||
{
|
||||
struct proto *p = &po->proto;
|
||||
struct fib_iterator fit;
|
||||
struct fib *fib = &po->rtf[ORT_NET];
|
||||
ort *nf;
|
||||
|
||||
DBG("Now syncing my rt table with nest's\n");
|
||||
FIB_ITERATE_INIT(&fit, fib);
|
||||
again:
|
||||
FIB_ITERATE_START(fib, &fit, nftmp)
|
||||
{
|
||||
nf = (ort *) nftmp;
|
||||
if (nf->n.metric1 == 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(fib, nftmp);
|
||||
goto again;
|
||||
}
|
||||
else if (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 = nf->n.ifa;
|
||||
a0.gw = nf->n.nh;
|
||||
ne = net_get(p->table, nf->fn.prefix, nf->fn.pxlen);
|
||||
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->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);
|
||||
}
|
||||
}
|
||||
FIB_ITERATE_END(nftmp);
|
||||
}
|
||||
|
||||
@ -10,31 +10,34 @@
|
||||
#ifndef _BIRD_OSPF_RT_H_
|
||||
#define _BIRD_OSPF_RT_H_
|
||||
|
||||
struct infib
|
||||
typedef struct orta
|
||||
{
|
||||
struct fib_node fn;
|
||||
u16 metric;
|
||||
u16 oldmetric;
|
||||
struct top_hash_entry *en;
|
||||
struct top_hash_entry *olden;
|
||||
};
|
||||
|
||||
struct extfib
|
||||
{
|
||||
struct fib_node fn;
|
||||
u16 metric;
|
||||
u16 metric2;
|
||||
ip_addr nh;
|
||||
int type;
|
||||
int capa;
|
||||
struct ospf_area *oa;
|
||||
int metric1;
|
||||
int metric2;
|
||||
ip_addr nh; /* Next hop */
|
||||
struct iface *ifa; /* Outgoing interface */
|
||||
struct top_hash_entry *ar; /* Advertising router */
|
||||
u32 tag;
|
||||
struct iface *nhi;
|
||||
u16 oldmetric;
|
||||
u16 oldmetric2;
|
||||
ip_addr oldnh;
|
||||
u32 oldtag;
|
||||
};
|
||||
}
|
||||
orta;
|
||||
|
||||
typedef struct ort
|
||||
{
|
||||
struct fib_node fn;
|
||||
int dest;
|
||||
#define ORT_UNDEF -1
|
||||
#define ORT_ROUTER 1
|
||||
#define ORT_NET 0
|
||||
orta n;
|
||||
orta o;
|
||||
}
|
||||
ort;
|
||||
|
||||
void ospf_rt_spf(struct proto_ospf *po);
|
||||
void init_infib(struct fib_node *fn);
|
||||
void init_efib(struct fib_node *fn);
|
||||
void ospf_rt_initort(struct fib_node *fn);
|
||||
|
||||
|
||||
#endif /* _BIRD_OSPF_RT_H_ */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user