bridge: Verify that a vlan is allowed to egress on given port

When bridge forwards a frame, make sure that a frame is allowed
to egress on that port.

Signed-off-by: Vlad Yasevich <vyasevic@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 0 deletions

diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index 4ef3f6b17bd0..787d7dad6b7e 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -35,6 +35,16 @@ static int br_pass_frame_up(struct sk_buff *skb)
         brstats->rx_bytes += skb->len;
         u64_stats_update_end(&brstats->syncp);
 
+        /* Bridge is just like any other port.  Make sure the
+         * packet is allowed except in promisc modue when someone
+         * may be running packet capture.
+         */
+        if (!(brdev->flags & IFF_PROMISC) &&
+            !br_allowed_egress(br, br_get_vlan_info(br), skb)) {
+                kfree_skb(skb);
+                return NET_RX_DROP;
+        }
+
         indev = skb->dev;
         skb->dev = brdev;