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ip6_tunnel: fix ip6 tunnel lookup in collect_md mode 

In collect_md mode, if the tun dev is down, it still can call
__ip6_tnl_rcv to receive on packets, and the rx statistics increase
improperly.

When the md tunnel is down, it's not neccessary to increase RX drops
for the tunnel device, packets would be recieved on fallback tunnel,
and the RX drops on fallback device will be increased as expected.

Fixes: 8d79266bc4 ("ip6_tunnel: add collect_md mode to IPv6 tunnels")
Cc: Alexei Starovoitov <ast@fb.com>
Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Haishuang Yan 2017-09-12 17:47:57 +08:00 committed by David S. Miller
parent 833a8b4054
commit 6c1cb4393c
1 changed files with 1 additions and 1 deletions
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2
net/ipv6/ip6_tunnel.c
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@ -171,7 +171,7 @@ ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_
}
t = rcu_dereference(ip6n->collect_md_tun);
if (t)
if (t && t->dev->flags & IFF_UP)
return t;
t = rcu_dereference(ip6n->tnls_wc[0]);