[NETFILTER]: nf_conntrack_expect: use RCU for expectation hash

Use RCU for expectation hash. This doesn't buy much for conntrack
runtime performance, but allows to reduce the use of nf_conntrack_lock
for /proc and nf_netlink_conntrack.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/net/netfilter/nf_conntrack_expect.h b/include/net/netfilter/nf_conntrack_expect.h
index 6c3fd254c28e..cb608a1b44e5 100644
--- a/include/net/netfilter/nf_conntrack_expect.h
+++ b/include/net/netfilter/nf_conntrack_expect.h
@@ -49,6 +49,8 @@ struct nf_conntrack_expect
         /* Direction relative to the master connection. */
         enum ip_conntrack_dir dir;
 #endif
+
+        struct rcu_head rcu;
 };
 
 #define NF_CT_EXPECT_PERMANENT 0x1