bridge: Validate that vlan is permitted on ingress
When a frame arrives on a port or transmitted by the bridge,
if we have VLANs configured, validate that a given VLAN is allowed
to enter the bridge.
Signed-off-by: Vlad Yasevich <vyasevic@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
index 209464e..8b4bcd8 100644
--- a/net/bridge/br_vlan.c
+++ b/net/bridge/br_vlan.c
@@ -64,6 +64,31 @@
kfree_rcu(v, rcu);
}
+/* Called under RCU */
+bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
+ struct sk_buff *skb)
+{
+ u16 vid;
+
+ /* If VLAN filtering is disabled on the bridge, all packets are
+ * permitted.
+ */
+ if (!br->vlan_enabled)
+ return true;
+
+ /* If there are no vlan in the permitted list, all packets are
+ * rejected.
+ */
+ if (!v)
+ return false;
+
+ br_vlan_get_tag(skb, &vid);
+ if (test_bit(vid, v->vlan_bitmap))
+ return true;
+
+ return false;
+}
+
/* Must be protected by RTNL */
int br_vlan_add(struct net_bridge *br, u16 vid)
{