diff options
| author | Herbert Xu <herbert@gondor.apana.org.au> | 2015-04-28 11:43:15 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-05-13 05:14:16 -0700 |
| commit | d177331ecb0579d5d12fb9bdbc385038ed3efac5 (patch) | |
| tree | f96504144c8ed1c81a0dc906175ea57aba80b268 /net | |
| parent | 59506497a7c844e81254c0a4bc2920510fac9a52 (diff) | |
route: Use ipv4_mtu instead of raw rt_pmtu
[ Upstream commit cb6ccf09d6b94bec4def1ac5cf4678d12b216474 ]
The commit 3cdaa5be9e81a914e633a6be7b7d2ef75b528562 ("ipv4: Don't
increase PMTU with Datagram Too Big message") broke PMTU in cases
where the rt_pmtu value has expired but is smaller than the new
PMTU value.
This obsolete rt_pmtu then prevents the new PMTU value from being
installed.
Fixes: 3cdaa5be9e81 ("ipv4: Don't increase PMTU with Datagram Too Big message")
Reported-by: Gerd v. Egidy <gerd.von.egidy@intra2net.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/route.c | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c index ad5064362c5c..20fc0202cbbe 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -963,10 +963,7 @@ static void __ip_rt_update_pmtu(struct rtable *rt, struct flowi4 *fl4, u32 mtu) if (dst_metric_locked(dst, RTAX_MTU)) return; - if (dst->dev->mtu < mtu) - return; - - if (rt->rt_pmtu && rt->rt_pmtu < mtu) + if (ipv4_mtu(dst) < mtu) return; if (mtu < ip_rt_min_pmtu) |