+static int deliver_clone(struct net_bridge_port *prev, struct sk_buff *skb,
+ void (*__packet_hook)(const struct net_bridge_port *p,
+ struct sk_buff *skb))
+{
+ skb = skb_clone(skb, GFP_ATOMIC);
+ if (!skb) {
+ struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev;
+
+ dev->stats.tx_dropped++;
+ return -ENOMEM;
+ }
+
+ __packet_hook(prev, skb);
+ return 0;
+}
+
+static struct net_bridge_port *maybe_deliver(
+ struct net_bridge_port *prev, struct net_bridge_port *p,
+ struct sk_buff *skb,
+ void (*__packet_hook)(const struct net_bridge_port *p,
+ struct sk_buff *skb))
+{
+ int err;
+
+ if (!should_deliver(p, skb))
+ return prev;
+
+ if (!prev)
+ goto out;
+
+ err = deliver_clone(prev, skb, __packet_hook);
+ if (err)
+ return ERR_PTR(err);
+
+out:
+ return p;
+}
+