Commit 0e8411e4 authored May 09, 2018 by Hangbin Liu Committed by David S. Miller May 10, 2018

ipv4: reset fnhe_mtu_locked after cache route flushed



After route cache is flushed via ipv4_sysctl_rtcache_flush(), we forget
to reset fnhe_mtu_locked in rt_bind_exception(). When pmtu is updated
in __ip_rt_update_pmtu(), it will return directly since the pmtu is
still locked. e.g.

+ ip netns exec client ping 10.10.1.1 -c 1 -s 1400 -M do
PING 10.10.1.1 (10.10.1.1) 1400(1428) bytes of data.
>From 10.10.0.254 icmp_seq=1 Frag needed and DF set (mtu = 0)

Signed-off-by: David S. Miller <davem@davemloft.net>

parent 55be9f25

net/ipv4/route.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -1375,6 +1375,7 @@ static bool rt_bind_exception(struct rtable rt, struct fib_nh_exception fnhe,
		fnhe->fnhe_gw = 0;
		fnhe->fnhe_pmtu = 0;
		fnhe->fnhe_expires = 0;
		fnhe->fnhe_mtu_locked = false;
		fnhe_flush_routes(fnhe);
		orig = NULL;
		}

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