netdev - [PATCH net v2] openvswitch: fix conntrack netlink event delivery

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Date:	Tue, 28 Jun 2016 17:22:26 +0200
From:	Samuel Gauthier <samuel.gauthier@...nd.com>
To:	pshelar@...ira.com, davem@...emloft.net
Cc:	netdev@...r.kernel.org, dev@...nvswitch.org,
	netfilter-devel@...r.kernel.org,
	Samuel Gauthier <samuel.gauthier@...nd.com>,
	Joe Stringer <joestringer@...ira.com>,
	Justin Pettit <jpettit@...ira.com>,
	Andy Zhou <azhou@...ira.com>, Thomas Graf <tgraf@...g.ch>
Subject: [PATCH net v2] openvswitch: fix conntrack netlink event delivery

Only the first and last netlink message for a particular conntrack are
actually sent. The first message is sent through nf_conntrack_confirm when
the conntrack is committed. The last one is sent when the conntrack is
destroyed on timeout. The other conntrack state change messages are not
advertised.

When the conntrack subsystem is used from netfilter, nf_conntrack_confirm
is called for each packet, from the postrouting hook, which in turn calls
nf_ct_deliver_cached_events to send the state change netlink messages.

This commit fixes the problem by calling nf_ct_deliver_cached_events in the
non-commit case as well.

Fixes: 7f8a436eaa2c ("openvswitch: Add conntrack action")
CC: Joe Stringer <joestringer@...ira.com>
CC: Justin Pettit <jpettit@...ira.com>
CC: Andy Zhou <azhou@...ira.com>
CC: Thomas Graf <tgraf@...g.ch>
Signed-off-by: Samuel Gauthier <samuel.gauthier@...nd.com>
---

v1 -> v2: don't break OVS_CT_ATTR_COMMIT attribute

This patch was tested against the net tree, checking the notifications with
conntrack -E.

 net/openvswitch/conntrack.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c
index 3d5feede962d..d84312584ee4 100644
--- a/net/openvswitch/conntrack.c
+++ b/net/openvswitch/conntrack.c
@@ -818,8 +818,18 @@ static int ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
 		 */
 		state = OVS_CS_F_TRACKED | OVS_CS_F_NEW | OVS_CS_F_RELATED;
 		__ovs_ct_update_key(key, state, &info->zone, exp->master);
-	} else
-		return __ovs_ct_lookup(net, key, info, skb);
+	} else {
+		struct nf_conn *ct;
+		int err;
+
+		err = __ovs_ct_lookup(net, key, info, skb);
+		if (err)
+			return err;
+
+		ct = (struct nf_conn *)skb->nfct;
+		if (ct)
+			nf_ct_deliver_cached_events(ct);
+	}

 	return 0;
 }
-- 
2.2.1.62.g3f15098