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route: Use the device mtu as the default for blackhole routes
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>
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2 changed files with 2 additions and 2 deletions
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@ -2757,7 +2757,7 @@ static struct dst_entry *ipv4_blackhole_dst_check(struct dst_entry *dst, u32 coo
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static unsigned int ipv4_blackhole_default_mtu(const struct dst_entry *dst)
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{
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return 0;
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return dst->dev->mtu;
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}
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static void ipv4_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu)
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@ -157,7 +157,7 @@ static struct dst_ops ip6_dst_ops_template = {
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static unsigned int ip6_blackhole_default_mtu(const struct dst_entry *dst)
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{
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return 0;
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return dst->dev->mtu;
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}
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static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu)
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