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authorHaishuang Yan <yanhaishuang@cmss.chinamobile.com>2017-09-12 17:47:57 +0800
committerDavid S. Miller <davem@davemloft.net>2017-09-12 20:45:31 -0700
commit6c1cb4393cc7e7107e4e94a9a0744451296ca8a6 (patch)
treea77f82af47f4e9c9c8f16d20f050acbab9e17ebc
parent833a8b405465e935a1ff7ab086b54a3ef90437ca (diff)
downloadlinux-6c1cb4393cc7e7107e4e94a9a0744451296ca8a6.tar.bz2
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: 8d79266bc48c ("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>
-rw-r--r--net/ipv6/ip6_tunnel.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index 10a693a19323..ae73164559d5 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -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]);