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Use link-local addresses in recursive next hops for IPv6 BGP.

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This commit is contained in:
Ondrej Zajicek 2010-07-28 11:45:35 +02:00
parent c477f48916
commit 1b180121a9
3 changed files with 21 additions and 12 deletions
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6
nest/route.h
View File

@ -163,7 +163,9 @@ struct hostcache {
struct hostentry { struct hostentry {
node ln; node ln;
ip_addr addr; /* IP of host, part of key */ ip_addr addr; /* IP address of host, part of key */
ip_addr link; /* (link-local) IP address of host, used as gw
if host is directly attached */
struct rtable *tab; /* Dependent table, part of key*/ struct rtable *tab; /* Dependent table, part of key*/
struct hostentry *next; /* Next in hash chain */ struct hostentry *next; /* Next in hash chain */
unsigned hash_key; /* Hash key */ unsigned hash_key; /* Hash key */
@ -386,7 +388,7 @@ static inline void rta_free(rta *r) { if (r && !--r->uc) rta__free(r); }
void rta_dump(rta *); void rta_dump(rta *);
void rta_dump_all(void); void rta_dump_all(void);
void rta_show(struct cli *, rta *, ea_list *); void rta_show(struct cli *, rta *, ea_list *);
void rta_set_recursive_next_hop(rtable *dep, rta *a, rtable *tab, ip_addr *gw); void rta_set_recursive_next_hop(rtable *dep, rta *a, rtable *tab, ip_addr *gw, ip_addr *ll);
/* /*
* rta_set_recursive_next_hop() acquires hostentry from hostcache and * rta_set_recursive_next_hop() acquires hostentry from hostcache and

15
nest/rt-table.c
View File

@ -1358,11 +1358,12 @@ hc_resize(struct hostcache *hc, unsigned new_order)
} }
static struct hostentry * static struct hostentry *
hc_new_hostentry(struct hostcache *hc, ip_addr a, rtable *dep, unsigned k) hc_new_hostentry(struct hostcache *hc, ip_addr a, ip_addr ll, rtable *dep, unsigned k)
{ {
struct hostentry *he = sl_alloc(hc->slab); struct hostentry *he = sl_alloc(hc->slab);
he->addr = a; he->addr = a;
he->link = ll;
he->tab = dep; he->tab = dep;
he->hash_key = k; he->hash_key = k;
he->uc = 0; he->uc = 0;
@ -1475,9 +1476,9 @@ rt_update_hostentry(rtable *tab, struct hostentry *he)
} }
else else
{ {
/* The host is directly reachable, us it as a gateway */ /* The host is directly reachable, use link as a gateway */
he->iface = a->iface; he->iface = a->iface;
he->gw = he->addr; he->gw = he->link;
he->dest = RTD_ROUTER; he->dest = RTD_ROUTER;
} }
} }
@ -1531,7 +1532,7 @@ rt_update_hostcache(rtable *tab)
} }
static struct hostentry * static struct hostentry *
rt_find_hostentry(rtable *tab, ip_addr a, rtable *dep) rt_find_hostentry(rtable *tab, ip_addr a, ip_addr ll, rtable *dep)
{ {
struct hostentry *he; struct hostentry *he;
@ -1544,15 +1545,15 @@ rt_find_hostentry(rtable *tab, ip_addr a, rtable *dep)
if (ipa_equal(he->addr, a) && (he->tab == dep)) if (ipa_equal(he->addr, a) && (he->tab == dep))
return he; return he;
he = hc_new_hostentry(hc, a, dep, k); he = hc_new_hostentry(hc, a, ll, dep, k);
rt_update_hostentry(tab, he); rt_update_hostentry(tab, he);
return he; return he;
} }
void void
rta_set_recursive_next_hop(rtable *dep, rta *a, rtable *tab, ip_addr *gw) rta_set_recursive_next_hop(rtable *dep, rta *a, rtable *tab, ip_addr *gw, ip_addr *ll)
{ {
rta_apply_hostentry(a, rt_find_hostentry(tab, *gw, dep)); rta_apply_hostentry(a, rt_find_hostentry(tab, *gw, *ll, dep));
} }
/* /*

12
proto/bgp/packets.c
View File

@ -805,11 +805,17 @@ static inline int
bgp_set_next_hop(struct bgp_proto *p, rta *a) bgp_set_next_hop(struct bgp_proto *p, rta *a)
{ {
struct eattr *nh = ea_find(a->eattrs, EA_CODE(EAP_BGP, BA_NEXT_HOP)); struct eattr *nh = ea_find(a->eattrs, EA_CODE(EAP_BGP, BA_NEXT_HOP));
ip_addr nexthop = *(ip_addr *) nh->u.ptr->data; ip_addr *nexthop = (ip_addr *) nh->u.ptr->data;
#ifdef IPV6
int second = (nh->u.ptr->length == NEXT_HOP_LENGTH);
#else
int second = 0;
#endif
if (p->cf->gw_mode == GW_DIRECT) if (p->cf->gw_mode == GW_DIRECT)
{ {
neighbor *ng = neigh_find(&p->p, &nexthop, 0) ? : p->neigh; neighbor *ng = neigh_find(&p->p, nexthop, 0) ? : p->neigh;
if (ng->scope == SCOPE_HOST) if (ng->scope == SCOPE_HOST)
return 0; return 0;
@ -819,7 +825,7 @@ bgp_set_next_hop(struct bgp_proto *p, rta *a)
a->hostentry = NULL; a->hostentry = NULL;
} }
else /* GW_RECURSIVE */ else /* GW_RECURSIVE */
rta_set_recursive_next_hop(p->p.table, a, p->igp_table, &nexthop); rta_set_recursive_next_hop(p->p.table, a, p->igp_table, nexthop, nexthop + second);
return 1; return 1;
} }