openvswitch: Add force commit.

Stateful network admission policy may allow connections to one
direction and reject connections initiated in the other direction.
After policy change it is possible that for a new connection an
overlapping conntrack entry already exists, where the original
direction of the existing connection is opposed to the new
connection's initial packet.

Most importantly, conntrack state relating to the current packet gets
the "reply" designation based on whether the original direction tuple
or the reply direction tuple matched.  If this "directionality" is
wrong w.r.t. to the stateful network admission policy it may happen
that packets in neither direction are correctly admitted.

This patch adds a new "force commit" option to the OVS conntrack
action that checks the original direction of an existing conntrack
entry.  If that direction is opposed to the current packet, the
existing conntrack entry is deleted and a new one is subsequently
created in the correct direction.

Signed-off-by: Jarno Rajahalme <jarno@ovn.org>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Acked-by: Joe Stringer <joe@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 24 insertions, 2 deletions

diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c
index bfd7606..8b15bab 100644
--- a/net/openvswitch/conntrack.c
+++ b/net/openvswitch/conntrack.c
@@ -65,6 +65,7 @@ struct ovs_conntrack_info {
 	struct nf_conn *ct;
 	u8 commit : 1;
 	u8 nat : 3;                 /* enum ovs_ct_nat */
+	u8 force : 1;
 	u16 family;
 	struct md_mark mark;
 	struct md_labels labels;
@@ -613,10 +614,13 @@ static bool skb_nfct_cached(struct net *net,
 	 */
 	if (!ct && key->ct.state & OVS_CS_F_TRACKED &&
 	    !(key->ct.state & OVS_CS_F_INVALID) &&
-	    key->ct.zone == info->zone.id)
+	    key->ct.zone == info->zone.id) {
 		ct = ovs_ct_find_existing(net, &info->zone, info->family, skb,
 					  !!(key->ct.state
 					     & OVS_CS_F_NAT_MASK));
+		if (ct)
+			nf_ct_get(skb, &ctinfo);
+	}
 	if (!ct)
 		return false;
 	if (!net_eq(net, read_pnet(&ct->ct_net)))
@@ -630,6 +634,18 @@ static bool skb_nfct_cached(struct net *net,
 		if (help && rcu_access_pointer(help->helper) != info->helper)
 			return false;
 	}
+	/* Force conntrack entry direction to the current packet? */
+	if (info->force && CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) {
+		/* Delete the conntrack entry if confirmed, else just release
+		 * the reference.
+		 */
+		if (nf_ct_is_confirmed(ct))
+			nf_ct_delete(ct, 0, 0);
+		else
+			nf_conntrack_put(&ct->ct_general);
+		nf_ct_set(skb, NULL, 0);
+		return false;
+	}
 
 	return true;
 }
@@ -1207,6 +1223,7 @@ static int parse_nat(const struct nlattr *attr,
 
 static const struct ovs_ct_len_tbl ovs_ct_attr_lens[OVS_CT_ATTR_MAX + 1] = {
 	[OVS_CT_ATTR_COMMIT]	= { .minlen = 0, .maxlen = 0 },
+	[OVS_CT_ATTR_FORCE_COMMIT]	= { .minlen = 0, .maxlen = 0 },
 	[OVS_CT_ATTR_ZONE]	= { .minlen = sizeof(u16),
 				    .maxlen = sizeof(u16) },
 	[OVS_CT_ATTR_MARK]	= { .minlen = sizeof(struct md_mark),
@@ -1246,6 +1263,9 @@ static int parse_ct(const struct nlattr *attr, struct ovs_conntrack_info *info,
 		}
 
 		switch (type) {
+		case OVS_CT_ATTR_FORCE_COMMIT:
+			info->force = true;
+			/* fall through. */
 		case OVS_CT_ATTR_COMMIT:
 			info->commit = true;
 			break;
@@ -1472,7 +1492,9 @@ int ovs_ct_action_to_attr(const struct ovs_conntrack_info *ct_info,
 	if (!start)
 		return -EMSGSIZE;
 
-	if (ct_info->commit && nla_put_flag(skb, OVS_CT_ATTR_COMMIT))
+	if (ct_info->commit && nla_put_flag(skb, ct_info->force
+					    ? OVS_CT_ATTR_FORCE_COMMIT
+					    : OVS_CT_ATTR_COMMIT))
 		return -EMSGSIZE;
 	if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
 	    nla_put_u16(skb, OVS_CT_ATTR_ZONE, ct_info->zone.id))