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Better routing table calculation. We are ready to work with

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multiple OSPF areas.
This commit is contained in:
Ondrej Filip 2004-06-11 09:36:50 +00:00
parent b1f7229ad7
commit 1a61882d37
4 changed files with 341 additions and 397 deletions
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7
proto/ospf/ospf.c
View file

@ -95,10 +95,10 @@ ospf_start(struct proto *p)
po->disp_timer->hook = ospf_disp; po->disp_timer->hook = ospf_disp;
po->disp_timer->recurrent = po->tick; po->disp_timer->recurrent = po->tick;
tm_start(po->disp_timer, 1); tm_start(po->disp_timer, 1);
fib_init(&po->efib, p->pool, sizeof(struct extfib), 16, init_efib);
init_list(&(po->iface_list)); init_list(&(po->iface_list));
init_list(&(po->area_list)); init_list(&(po->area_list));
fib_init(&po->rtf[0], p->pool, sizeof(ort), 16, ospf_rt_initort);
fib_init(&po->rtf[1], p->pool, sizeof(ort), 16, ospf_rt_initort);
po->areano = 0; po->areano = 0;
if (EMPTY_LIST(c->area_list)) if (EMPTY_LIST(c->area_list))
{ {
@ -133,8 +133,6 @@ ospf_start(struct proto *p)
antmp->hidden = anet->hidden; antmp->hidden = anet->hidden;
add_tail(&oa->net_list, NODE antmp); add_tail(&oa->net_list, NODE antmp);
} }
fib_init(&oa->infib, po->proto.pool, sizeof(struct infib), 16,
init_infib);
} }
return PS_UP; return PS_UP;
} }
@ -191,6 +189,7 @@ ospf_init(struct proto_config *c)
static int static int
ospf_rte_better(struct rte *new, struct rte *old) ospf_rte_better(struct rte *new, struct rte *old)
{ {
/* FIXME this is wrong */
if (new->u.ospf.metric1 == LSINFINITY) if (new->u.ospf.metric1 == LSINFINITY)
return 0; return 0;

13
proto/ospf/ospf.h
View file

@ -248,10 +248,17 @@ struct ospf_lsa_header
struct vebb struct vebb
{ {
#ifdef _BIG_ENDIAN
u8 padding:5;
u8 v:1;
u8 e:1;
u8 b:1;
#else
u8 b:1; u8 b:1;
u8 e:1; u8 e:1;
u8 v:1; u8 v:1;
u8 padding:5; u8 padding:5;
#endif
}; };
union veb union veb
@ -263,9 +270,6 @@ union veb
struct ospf_lsa_rt struct ospf_lsa_rt
{ {
union veb veb; union veb veb;
#define LSA_RT_V 5
#define LSA_RT_E 6
#define LSA_RT_B 7
u8 padding; u8 padding;
u16 links; u16 links;
}; };
@ -432,7 +436,6 @@ struct ospf_area
int stub; int stub;
int trcap; /* Transit capability? */ int trcap; /* Transit capability? */
struct proto_ospf *po; struct proto_ospf *po;
struct fib infib; /* FIB for intra-area routes */
unsigned tick; unsigned tick;
}; };
@ -445,7 +448,7 @@ struct proto_ospf
list iface_list; /* Interfaces we really use */ list iface_list; /* Interfaces we really use */
list area_list; list area_list;
int areano; /* Number of area I belong to */ int areano; /* Number of area I belong to */
struct fib efib; /* FIB for external routes */ struct fib rtf[2]; /* Routing tables */
int rfc1583; /* RFC1583 compatibility */ int rfc1583; /* RFC1583 compatibility */
int ebit; /* Did I originate any ext lsa? */ int ebit; /* Did I originate any ext lsa? */
}; };

659
proto/ospf/rt.c
View file

@ -7,36 +7,103 @@
*/ */
#include "ospf.h" #include "ospf.h"
static void add_cand(list * l, struct top_hash_entry *en, static void
struct top_hash_entry *par, u16 dist, add_cand(list * l, struct top_hash_entry *en,
struct ospf_area *oa); struct top_hash_entry *par, u16 dist, struct ospf_area *oa);
static void calc_next_hop(struct top_hash_entry *en, static void
calc_next_hop(struct top_hash_entry *en,
struct top_hash_entry *par, struct ospf_area *oa); struct top_hash_entry *par, struct ospf_area *oa);
static void ospf_ext_spfa(struct proto_ospf *po); static void ospf_ext_spfa(struct ospf_area *oa);
static void rt_sync(struct proto_ospf *po);
void static void
init_infib(struct fib_node *fn) fill_ri(orta * orta)
{ {
struct infib *f = (struct infib *) fn; orta->type = RTS_DUMMY;
orta->capa = 0;
f->metric = LSINFINITY; #define ORTA_ASBR 1
f->oldmetric = LSINFINITY; #define ORTA_ABR 2
f->en = NULL; orta->oa = NULL;
f->olden = NULL; orta->metric1 = LSINFINITY;
orta->metric2 = LSINFINITY;
orta->nh = ipa_from_u32(0);
orta->ifa = NULL;
orta->ar = NULL;
orta->tag = 0;
} }
void void
init_efib(struct fib_node *fn) ospf_rt_initort(struct fib_node *fn)
{ {
struct extfib *f = (struct extfib *) fn; ort *ri = (ort *) fn;
fill_ri(&ri->n);
ri->dest = ORT_UNDEF;
memcpy(&ri->o, &ri->n, sizeof(orta));
}
f->metric = LSINFINITY; /* If new is better return 1 */
f->metric2 = LSINFINITY; static int
f->nh = ipa_from_u32(0); ri_better(struct proto_ospf *po, orta * new, orta * old)
f->nhi = NULL; {
f->oldmetric = LSINFINITY; int newtype = new->type;
f->oldmetric2 = LSINFINITY; int oldtype = old->type;
f->oldnh = ipa_from_u32(0);
if (old->type == RTS_DUMMY)
return 1;
if (old->metric1 == LSINFINITY)
return 1;
if (po->rfc1583)
{
if ((newtype == RTS_OSPF) && (new->oa->areaid == 0)) newtype = RTS_OSPF_IA;
if ((oldtype == RTS_OSPF) && (old->oa->areaid == 0)) oldtype = RTS_OSPF_IA;
}
if (new->type < old->type)
return 1;
if (new->metric2 < old->metric2)
{
if (old->metric2 == LSINFINITY)
return 0; /* Old is E1, new is E2 */
return 1; /* Both are E2 */
}
if (new->metric2 > old->metric2)
{
if (new->metric2 == LSINFINITY)
return 1; /* New is E1, old is E2 */
return 0; /* Both are E2 */
}
/*
* E2 metrics are the same. It means that: 1) Paths are E2 with same
* metric 2) Paths are E1.
*/
if (new->metric1 < old->metric1)
return 1;
if (new->metric1 > old->metric1)
return 0;
/* Metric 1 are the same */
if (new->oa->areaid > old->oa->areaid) return 1; /* Larger AREAID is preffered */
return 0; /* Old is shorter or same */
}
static void
ri_install(struct proto_ospf *po, ip_addr prefix, int pxlen, int dest,
orta * new)
{
ort *old = (ort *) fib_get(&po->rtf[dest], &prefix, pxlen);
if (ri_better(po, new, &old->n))
{
memcpy(&old->n, new, sizeof(orta));
}
} }
/** /**
@ -49,37 +116,26 @@ init_efib(struct fib_node *fn)
* and latter parts of routing table calculation look directly into LSA * and latter parts of routing table calculation look directly into LSA
* Database. This function is invoked from ospf_disp(). * Database. This function is invoked from ospf_disp().
*/ */
void static void
ospf_rt_spfa(struct ospf_area *oa) ospf_rt_spfa(struct ospf_area *oa)
{ {
u32 i, *rts; u32 i, *rts;
struct ospf_lsa_rt *rt; struct ospf_lsa_rt *rt;
struct ospf_lsa_rt_link *rtl, *rr; struct ospf_lsa_rt_link *rtl, *rr;
struct fib *in = &oa->infib;
struct infib *nf;
struct fib_iterator fit;
struct proto *p = &oa->po->proto; struct proto *p = &oa->po->proto;
struct proto_ospf *po = oa->po; struct proto_ospf *po = oa->po;
ip_addr ip;
struct ospf_lsa_net *ln; struct ospf_lsa_net *ln;
orta nf;
OSPF_TRACE(D_EVENTS, "Starting routing table calculation for area %I",
oa->areaid);
if (oa->rt == NULL) if (oa->rt == NULL)
return; return;
OSPF_TRACE(D_EVENTS, "Starting routing table calculation for area %I",
oa->areaid);
if (oa->rt->dist != LSINFINITY) if (oa->rt->dist != LSINFINITY)
ospf_age(oa); ospf_age(oa);
FIB_WALK(in, nftmp)
{
nf = (struct infib *) nftmp;
nf->metric = LSINFINITY;
nf->en = NULL;
}
FIB_WALK_END;
init_list(&oa->cand); /* Empty list of candidates */ init_list(&oa->cand); /* Empty list of candidates */
oa->trcap = 0; oa->trcap = 0;
@ -95,7 +151,6 @@ ospf_rt_spfa(struct ospf_area *oa)
{ {
struct top_hash_entry *act, *tmp; struct top_hash_entry *act, *tmp;
node *n; node *n;
u16 met;
n = HEAD(oa->cand); n = HEAD(oa->cand);
act = SKIP_BACK(struct top_hash_entry, cn, n); act = SKIP_BACK(struct top_hash_entry, cn, n);
@ -111,6 +166,20 @@ ospf_rt_spfa(struct ospf_area *oa)
rt = (struct ospf_lsa_rt *) act->lsa_body; rt = (struct ospf_lsa_rt *) act->lsa_body;
if (rt->veb.bit.v) if (rt->veb.bit.v)
oa->trcap = 1; oa->trcap = 1;
if (rt->veb.bit.b || rt->veb.bit.e)
{
nf.type = RTS_OSPF;
nf.capa = 0;
if (rt->veb.bit.b) nf.capa |= ORTA_ABR;
if (rt->veb.bit.e) nf.capa |= ORTA_ASBR;
nf.metric1 = act->dist;
nf.metric2 = LSINFINITY;
nf.oa = oa;
nf.ar = act;
nf.nh = act->nh;
nf.ifa = act->nhi;
ri_install(po, ipa_from_u32(act->lsa.id), 32, ORT_ROUTER, &nf);
}
rr = (struct ospf_lsa_rt_link *) (rt + 1); rr = (struct ospf_lsa_rt_link *) (rt + 1);
DBG(" Number of links: %u\n", rt->links); DBG(" Number of links: %u\n", rt->links);
for (i = 0; i < rt->links; i++) for (i = 0; i < rt->links; i++)
@ -121,26 +190,28 @@ ospf_rt_spfa(struct ospf_area *oa)
switch (rtl->type) switch (rtl->type)
{ {
case LSART_STUB: case LSART_STUB:
/* This violates rfc2328! but I hope it's also correct. */ /*
* This violates rfc2328! but I hope
* it's also correct.
*/
DBG("\n"); DBG("\n");
ip = ipa_from_u32(rtl->id); if (act == oa->rt)
nf = fib_get(in, &ip, ipa_mklen(ipa_from_u32(rtl->data))); continue;
if (nf->metric > (met = act->dist + rtl->metric)) if (!act->nhi)
{ continue;
DBG(" Adding stub route....\n"); nf.type = RTS_OSPF;
if (oa->rt == act) nf.capa = 0;
nf.metric1 = act->dist + rtl->metric;
nf.metric2 = LSINFINITY;
nf.oa = oa;
nf.ar = act;
nf.nh = act->nh;
nf.ifa = act->nhi;
ri_install(po, ipa_from_u32(rtl->id),
ipa_mklen(ipa_from_u32(rtl->data)), ORT_NET, &nf);
break; break;
if (act->nhi == NULL)
break; case LSART_VLNK: /* FIXME !!!!!!!! */
nf->metric = met;
nf->en = act;
DBG(" Adding stub route: %I\n", ip);
DBG(" Next hop=%I\n", nf->en->nh);
}
else
DBG(" NOT adding stub route: %I\n", ip);
break;
case LSART_VLNK:
DBG("Ignoring\n"); DBG("Ignoring\n");
continue; continue;
break; break;
@ -167,14 +238,17 @@ ospf_rt_spfa(struct ospf_area *oa)
break; break;
case LSA_T_NET: case LSA_T_NET:
ln = act->lsa_body; ln = act->lsa_body;
ip = ipa_and(ipa_from_u32(act->lsa.id), ln->netmask); nf.type = RTS_OSPF;
nf = fib_get(in, &ip, ipa_mklen(ln->netmask)); nf.capa = 0;
if (nf->metric > act->dist) nf.metric1 = act->dist;
{ nf.metric2 = LSINFINITY;
nf->metric = act->dist; nf.oa = oa;
nf->en = act; nf.ar = act;
DBG(" Adding into routing table\n"); nf.nh = act->nh;
} nf.ifa = act->nhi;
ri_install(po, ipa_and(ipa_from_u32(act->lsa.id), ln->netmask),
ipa_mklen(ln->netmask), ORT_NET, &nf);
rts = (u32 *) (ln + 1); rts = (u32 *) (ln + 1);
for (i = 0; i < (act->lsa.length - sizeof(struct ospf_lsa_header) - for (i = 0; i < (act->lsa.length - sizeof(struct ospf_lsa_header) -
sizeof(struct ospf_lsa_net)) / sizeof(u32); i++) sizeof(struct ospf_lsa_net)) / sizeof(u32); i++)
@ -190,104 +264,60 @@ ospf_rt_spfa(struct ospf_area *oa)
break; break;
} }
} }
/* Now sync our fib with nest's */
DBG("Now syncing my rt table with nest's\n");
FIB_ITERATE_INIT(&fit, in);
again:
FIB_ITERATE_START(in, &fit, nftmp)
{
nf = (struct infib *) nftmp;
if (nf->metric == LSINFINITY)
{
net *ne;
struct top_hash_entry *en = nf->en;
ln = en->lsa_body;
ne = net_get(p->table, nf->fn.prefix, nf->fn.pxlen);
if ((en != NULL) && (en->nhi != NULL))
DBG("Deleting rt entry %I\n (P: %x, GW: %I, Iface: %s)\n",
nf->fn.prefix, en, en->nh, en->nhi->name);
rte_update(p->table, ne, p, NULL);
/* Now delete my fib */
FIB_ITERATE_PUT(&fit, nftmp);
fib_delete(in, nftmp);
goto again;
}
else
{
/* Update routing table */
if (ipa_equal(nf->en->nh, ipa_from_u32(0)))
{
struct top_hash_entry *en = nf->en;
struct ospf_neighbor *neigh;
neighbor *nn;
if ((neigh = find_neigh_noifa(po, en->lsa.rt)) == NULL)
{
goto skip;
}
nn = neigh_find(p, &neigh->ip, 0);
DBG(" Next hop calculated: %I\n", nn->addr);
en->nh = nn->addr;
en->nhi = nn->iface;
}
if ((nf->en != nf->olden) || (nf->metric != nf->oldmetric))
{
net *ne;
rta a0;
rte *e;
struct top_hash_entry *en = nf->en;
ln = en->lsa_body;
bzero(&a0, sizeof(a0));
a0.proto = p;
a0.source = RTS_OSPF;
a0.scope = SCOPE_UNIVERSE;
a0.cast = RTC_UNICAST;
if (ipa_to_u32(en->nh) == 0)
a0.dest = RTD_DEVICE;
else
a0.dest = RTD_ROUTER;
a0.flags = 0;
a0.aflags = 0;
a0.iface = en->nhi;
a0.gw = en->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 = LSINFINITY;
e->u.ospf.tag = 0;
e->pflags = 0;
e->net = ne;
e->pref = p->preference;
DBG("Modifying rt entry %I\n (GW: %I, Iface: %s)\n",
nf->fn.prefix, en->nh, en->nhi->name);
rte_update(p->table, ne, p, e);
nf->olden = nf->en;
nf->oldmetric = nf->metric;
}
}
}
skip:
FIB_ITERATE_END(nftmp);
ospf_ext_spfa(po);
} }
void void
ospf_rt_spf(struct proto_ospf *po) ospf_rt_spf(struct proto_ospf *po)
{ {
struct proto *p = &po->proto;
struct ospf_area *oa; struct ospf_area *oa;
int i;
ort *ri;
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) WALK_LIST(oa, po->area_list)
{ {
ospf_rt_spfa(oa); 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. * Inter- and Intra-area paths are always prefered over externals.
*/ */
static void 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 proto_ospf *po = oa->po;
struct fib *ef = &po->efib; ort *nf1, *nf2;
struct extfib *nf; orta nfa;
struct infib *inf; struct top_hash_entry *en;
struct fib_iterator fit;
struct ospf_area *oa = NULL, *atmp, *absroa;
struct proto *p = &po->proto; struct proto *p = &po->proto;
struct ospf_lsa_ext *le; struct ospf_lsa_ext *le;
struct ospf_lsa_ext_tos *lt; struct ospf_lsa_ext_tos *lt;
int mlen; int mlen;
ip_addr ip, nnh; ip_addr ip, nh, rtid;
struct iface *nnhi = NULL; struct iface *nhi = NULL;
u16 met, met2; int met1, met2;
u32 tag;
neighbor *nn; neighbor *nn;
struct ospf_lsa_rt *rt;
OSPF_TRACE(D_EVENTS, "Starting routing table calculation for ext routes"); 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) WALK_SLIST(en, oa->lsal)
{ {
if (en->lsa.type != LSA_T_EXT) 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); p->name, en->lsa.id, en->lsa.rt, en->lsa.type, le->netmask);
continue; continue;
} }
nhi = NULL;
nh = IPA_NONE;
nf = NULL; met1 = LSINFINITY;
met2 = LSINFINITY;
WALK_LIST(atmp, po->area_list) rtid = ipa_from_u32(en->lsa.rt);
{
if ((nf = fib_find(&atmp->infib, &ip, mlen)) != NULL)
break;
}
if (nf != NULL) if (!(nf1 = fib_find(&po->rtf[ORT_ROUTER], &rtid, 32)))
continue; /* Some intra area path exists */ continue; /* No AS boundary router found */
absr = NULL; if (nf1->n.metric1 == LSINFINITY)
absroa = NULL; continue; /* distance is INF */
nnhi = NULL;
nnh = IPA_NONE;
met = 0; if (!(nf1->n.capa & ORTA_ASBR))
met2 = 0; continue; /* It is not ASBR */
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 (ipa_compare(lt->fwaddr, ipa_from_u32(0)) == 0) if (ipa_compare(lt->fwaddr, ipa_from_u32(0)) == 0)
{ {
if (lt->etos > 0) /* FW address == 0 */ if (lt->etos > 0)
{ { /* FW address == 0 */
met = absr->dist; met1 = nf1->n.metric1;
met2 = lt->metric; met2 = lt->metric;
} }
else else
{ {
met = absr->dist + lt->metric; met1 = nf1->n.metric1 + lt->metric;
met2 = LSINFINITY; met2 = LSINFINITY;
} }
tag = lt->tag; nh = nf1->n.nh;
nhi = nf1->n.ifa;
} }
else /* FW address !=0 */ else
{ { /* FW address !=0 */
inf = NULL; if (!(nf2 = fib_route(&po->rtf[ORT_NET], lt->fwaddr, 32)))
WALK_LIST(atmp, po->area_list)
{
if ((inf = fib_route(&atmp->infib, lt->fwaddr, 32)) != NULL)
{
break;
}
}
if (inf == NULL)
{ {
DBG("Cannot find network route (GW=%I)\n", lt->fwaddr); DBG("Cannot find network route (GW=%I)\n", lt->fwaddr);
continue; continue;
} }
if (lt->etos > 0) if (lt->etos > 0)
{ {
met = inf->metric; met1 = nf2->n.metric1;
met2 = lt->metric; met2 = lt->metric;
} }
else else
{ {
met = inf->metric + lt->metric; met1 = nf2->n.metric1 + lt->metric;
met2 = LSINFINITY; met2 = LSINFINITY;
} }
tag = lt->tag;
if ((nn = neigh_find(p, &lt->fwaddr, 0)) != NULL) if ((nn = neigh_find(p, &lt->fwaddr, 0)) != NULL)
{ {
nnh = lt->fwaddr; nh = lt->fwaddr;
nnhi = nn->iface; nhi = nn->iface;
} }
else else
{ {
nnh = inf->en->nh; nh = nf2->n.nh;
nnhi = inf->en->nhi; nhi = nf2->n.ifa;
} }
} }
nf = fib_get(ef, &ip, mlen); nfa.type = RTS_OSPF_EXT;
if ((nf->metric == LSINFINITY) || /* nf is new */ nfa.capa = 0;
((met < nf->metric) && (nf->metric2 == met2)) || /* both E1 or E2 nfa.metric1 = met1;
* with same metric */ nfa.metric2 = met2;
((met2 < nf->metric2) && (nf->metric2 != LSINFINITY)) || /* E2 smaller and nfa.oa = oa;
* 1st is not E1 */ nfa.ar = nf1->n.ar;
((nf->metric2 != LSINFINITY) && (met2 == LSINFINITY))) /* 2nd is E1 and nfa.nh = nh;
* 1st is E2 */ nfa.ifa = nhi;
{ nfa.tag = lt->tag;
if (nf->metric != LSINFINITY) ri_install(po, ip, mlen, ORT_NET, &nfa);
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;
}
}
}
} }
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 */ /* 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) if (dist >= en->dist)
return; return;
/* /*
* FIXME The line above is not a bug, but we don't support * FIXME The line above is not a bug, but we don't support multiple
* multiple next hops. I'll start as soon as nest will * next hops. I'll start as soon as nest will
*/ */
DBG(" Adding candidate: rt: %I, id: %I, type: %u\n", en->lsa.rt, DBG(" Adding candidate: rt: %I, id: %I, type: %u\n", en->lsa.rt,
en->lsa.id, en->lsa.type); 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) if (!en->nhi)
return; /* We cannot find next hop, ignore it */ 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); rem_node(&en->cn);
} }
en->dist = dist; en->dist = dist;
en->color = CANDIDATE; 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) if ((neigh = find_neigh_noifa(po, en->lsa.rt)) == NULL)
return; return;
en->nhi = neigh->ifa->iface; 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; return;
} }
} }
if (par->lsa.type == LSA_T_NET) if (par->lsa.type == LSA_T_NET)
{ {
if (en->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) if ((neigh = find_neigh_noifa(po, en->lsa.rt)) == NULL)
return; return;
en->nhi = neigh->ifa->iface; 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; 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)", log(L_ERR "Router's parent has no next hop. (EN=%I, PAR=%I)",
en->lsa.id, par->lsa.id); en->lsa.id, par->lsa.id);
/* I hoped this would never happen */ /* 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; en->nhi = par->nhi;
DBG(" Next hop calculated: %I.\n", en->nh); 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);
}

47
proto/ospf/rt.h
View file

@ -10,31 +10,34 @@
#ifndef _BIRD_OSPF_RT_H_ #ifndef _BIRD_OSPF_RT_H_
#define _BIRD_OSPF_RT_H_ #define _BIRD_OSPF_RT_H_
struct infib typedef struct orta
{ {
struct fib_node fn; int type;
u16 metric; int capa;
u16 oldmetric; struct ospf_area *oa;
struct top_hash_entry *en; int metric1;
struct top_hash_entry *olden; int metric2;
}; ip_addr nh; /* Next hop */
struct iface *ifa; /* Outgoing interface */
struct extfib struct top_hash_entry *ar; /* Advertising router */
{
struct fib_node fn;
u16 metric;
u16 metric2;
ip_addr nh;
u32 tag; u32 tag;
struct iface *nhi; }
u16 oldmetric; orta;
u16 oldmetric2;
ip_addr oldnh; typedef struct ort
u32 oldtag; {
}; 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 ospf_rt_spf(struct proto_ospf *po);
void init_infib(struct fib_node *fn); void ospf_rt_initort(struct fib_node *fn);
void init_efib(struct fib_node *fn);
#endif /* _BIRD_OSPF_RT_H_ */ #endif /* _BIRD_OSPF_RT_H_ */