ipv6: add mtu lock check in __ip6_rt_update_pmtu
Prior to this patch, ipv6 didn't do mtu lock check in ip6_update_pmtu.
It leaded to that mtu lock doesn't really work when receiving the pkt
of ICMPV6_PKT_TOOBIG.
This patch is to add mtu lock check in __ip6_rt_update_pmtu just as ipv4
did in __ip_rt_update_pmtu.
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 947ed1d..7403d90 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1364,6 +1364,9 @@
if (rt6->rt6i_flags & RTF_LOCAL)
return;
+ if (dst_metric_locked(dst, RTAX_MTU))
+ return;
+
dst_confirm(dst);
mtu = max_t(u32, mtu, IPV6_MIN_MTU);
if (mtu >= dst_mtu(dst))