Commit 19bda36c authored Oct 28, 2016 by Xin Long Committed by David S. Miller Oct 31, 2016

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>

parent f89c56ce

net/ipv6/route.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -1364,6 +1364,9 @@ static void __ip6_rt_update_pmtu(struct dst_entry dst, const struct sock sk,
		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))