netdev - [PATCH net-next v4 4/8] openvswitch: Update the CT state key only after nf_conntrack

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Date:	Tue,  8 Dec 2015 17:01:06 -0800
From:	Jarno Rajahalme <jarno@....org>
To:	netdev@...r.kernel.org
Cc:	netfilter-devel@...r.kernel.org, dev@...nvswitch.org, jarno@....org
Subject: [PATCH net-next v4 4/8] openvswitch: Update the CT state key only after nf_conntrack_in().

Only a successful nf_conntrack_in() call can effect a connection state
change, so if suffices to update the key only after the
nf_conntrack_in() returns.

This change is needed for the later NAT patches.

Signed-off-by: Jarno Rajahalme <jarno@....org>
---
 net/openvswitch/conntrack.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c
index a28a819..10f4a6e 100644
--- a/net/openvswitch/conntrack.c
+++ b/net/openvswitch/conntrack.c
@@ -194,7 +194,6 @@ static int ovs_ct_set_mark(struct sk_buff *skb, struct sw_flow_key *key,
 	struct nf_conn *ct;
 	u32 new_mark;
 
-
 	/* The connection could be invalid, in which case set_mark is no-op. */
 	ct = nf_ct_get(skb, &ctinfo);
 	if (!ct)
@@ -385,6 +384,10 @@ static bool skb_nfct_cached(const struct net *net, const struct sk_buff *skb,
 	return true;
 }
 
+/* Pass 'skb' through conntrack in 'net', using zone configured in 'info', if
+ * not done already.  Update key with new CT state after passing the packet
+ * through conntrack.
+ */
 static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
 			   const struct ovs_conntrack_info *info,
 			   struct sk_buff *skb)
@@ -410,14 +413,14 @@ static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
 				    skb) != NF_ACCEPT)
 			return -ENOENT;
 
+		ovs_ct_update_key(skb, key, true);
+
 		if (ovs_ct_helper(skb, info->family) != NF_ACCEPT) {
 			WARN_ONCE(1, "helper rejected packet");
 			return -EINVAL;
 		}
 	}
 
-	ovs_ct_update_key(skb, key, true);
-
 	return 0;
 }
 
-- 
2.1.4

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