netdev - [PATCH v4 net-next 03/10] openvswitch: Do not trigger events for unconfirmed connections.

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Message-Id: <1486668121-45709-4-git-send-email-jarno@ovn.org>
Date:   Thu,  9 Feb 2017 11:21:54 -0800
From:   Jarno Rajahalme <jarno@....org>
To:     netdev@...r.kernel.org
Cc:     jarno@....org, davem@...emloft.net, joe@....org, pshelar@....org
Subject: [PATCH v4 net-next 03/10] openvswitch: Do not trigger events for unconfirmed connections.

Receiving change events before the 'new' event for the connection has
been received can be confusing.  Avoid triggering change events for
setting conntrack mark or labels before the conntrack entry has been
confirmed.

Fixes: 182e3042e15d ("openvswitch: Allow matching on conntrack mark")
Fixes: c2ac66735870 ("openvswitch: Allow matching on conntrack label")
Signed-off-by: Jarno Rajahalme <jarno@....org>
Acked-by: Joe Stringer <joe@....org>
Acked-by: Pravin B Shelar <pshelar@....org>
---
 net/openvswitch/conntrack.c | 28 ++++++++++++++++++++++------
 1 file changed, 22 insertions(+), 6 deletions(-)

diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c
index 4df9a54..a6ff374 100644
--- a/net/openvswitch/conntrack.c
+++ b/net/openvswitch/conntrack.c
@@ -245,7 +245,8 @@ static int ovs_ct_set_mark(struct sk_buff *skb, struct sw_flow_key *key,
 	new_mark = ct_mark | (ct->mark & ~(mask));
 	if (ct->mark != new_mark) {
 		ct->mark = new_mark;
-		nf_conntrack_event_cache(IPCT_MARK, ct);
+		if (nf_ct_is_confirmed(ct))
+			nf_conntrack_event_cache(IPCT_MARK, ct);
 		key->ct.mark = new_mark;
 	}
 
@@ -262,7 +263,6 @@ static int ovs_ct_set_labels(struct sk_buff *skb, struct sw_flow_key *key,
 	enum ip_conntrack_info ctinfo;
 	struct nf_conn_labels *cl;
 	struct nf_conn *ct;
-	int err;
 
 	/* The connection could be invalid, in which case set_label is no-op.*/
 	ct = nf_ct_get(skb, &ctinfo);
@@ -277,10 +277,26 @@ static int ovs_ct_set_labels(struct sk_buff *skb, struct sw_flow_key *key,
 	if (!cl || sizeof(cl->bits) < OVS_CT_LABELS_LEN)
 		return -ENOSPC;
 
-	err = nf_connlabels_replace(ct, (u32 *)labels, (u32 *)mask,
-				    OVS_CT_LABELS_LEN / sizeof(u32));
-	if (err)
-		return err;
+	if (nf_ct_is_confirmed(ct)) {
+		/* Triggers a change event, which makes sense only for
+		 * confirmed connections.
+		 */
+		int err = nf_connlabels_replace(ct, (u32 *)labels, (u32 *)mask,
+						OVS_CT_LABELS_LEN / sizeof(u32));
+		if (err)
+			return err;
+	} else {
+		u32 *dst = (u32 *)cl->bits;
+		const u32 *msk = (const u32 *)mask->ct_labels;
+		const u32 *lbl = (const u32 *)labels->ct_labels;
+		int i;
+
+		/* No-one else has access to the non-confirmed entry, copy
+		 * labels over, keeping any bits we are not explicitly setting.
+		 */
+		for (i = 0; i < OVS_CT_LABELS_LEN / sizeof(u32); i++)
+			dst[i] = (dst[i] & ~msk[i]) | (lbl[i] & msk[i]);
+	}
 
 	ovs_ct_get_labels(ct, &key->ct.labels);
 	return 0;
-- 
2.1.4