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route: Use the device mtu as the default for blackhole routes

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As it is, we return null as the default mtu of blackhole routes.
This may lead to a propagation of a bogus pmtu if the default_mtu
method of a blackhole route is invoked. So return dst->dev->mtu
as the default mtu instead.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Steffen Klassert 2011-11-23 02:12:13 +00:00 committed by David S. Miller
parent df07a94cf5
commit 6b600b26c0
2 changed files with 2 additions and 2 deletions
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2
net/ipv4/route.c
View file

@ -2757,7 +2757,7 @@ static struct dst_entry *ipv4_blackhole_dst_check(struct dst_entry *dst, u32 coo
static unsigned int ipv4_blackhole_default_mtu(const struct dst_entry *dst)
{
return 0;
return dst->dev->mtu;
}
static void ipv4_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu)

2
net/ipv6/route.c
View file

@ -157,7 +157,7 @@ static struct dst_ops ip6_dst_ops_template = {
static unsigned int ip6_blackhole_default_mtu(const struct dst_entry *dst)
{
return 0;
return dst->dev->mtu;
}
static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu)