netdev - [PATCH net-next v3 6/8] openvswitch: Handle NF

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Date:	Wed, 25 Nov 2015 16:08:19 -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 v3 6/8] openvswitch: Handle NF_REPEAT in conntrack action.

Repeat the nf_conntrack_in() call when it returns NF_REPEAT.  This
avoids dropping a SYN packet re-opening an existing TCP connection.

Signed-off-by: Jarno Rajahalme <jarno@....org>
---
 net/openvswitch/conntrack.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c
index 0c371d0..7aa38fa 100644
--- a/net/openvswitch/conntrack.c
+++ b/net/openvswitch/conntrack.c
@@ -470,6 +470,7 @@ static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
 	 */
 	if (!skb_nfct_cached(net, key, info, skb)) {
 		struct nf_conn *tmpl = info->ct;
+		int err;
 
 		/* Associate skb with specified zone. */
 		if (tmpl) {
@@ -480,8 +481,13 @@ static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
 			skb->nfctinfo = IP_CT_NEW;
 		}
 
-		if (nf_conntrack_in(net, info->family, NF_INET_PRE_ROUTING,
-				    skb) != NF_ACCEPT)
+		/* Repeat if requested, see nf_iterate(). */
+		do {
+			err = nf_conntrack_in(net, info->family,
+					      NF_INET_PRE_ROUTING, skb);
+		} while (err == NF_REPEAT);
+
+		if (err != NF_ACCEPT)
 			return -ENOENT;
 
 		ovs_ct_update_key(skb, key, true);
-- 
2.1.4

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