Merge branch 'bridge_8021AD'

Vlad Yasevich says:

====================
bridge: Fix forwarding of 8021AD frames

Bridge has its own way to deterine if the packet is forwardable and it doesn't
support 8021ad tags correctly. Instead just allow bridge to use an
existing is_skb_forwardable() function.

v2: Fix missing hunk in patch 2/2 to make it build.

v3: Fix indent for is_skb_forwardable
====================

Signed-off-by: David S. Miller <[e-mail]>

include/linux/netdevice.h

···
 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
 			struct netdev_queue *txq);
 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb);
+bool is_skb_forwardable(struct net_device *dev, struct sk_buff *skb);
 
 extern int		netdev_budget;
 

net/bridge/br_forward.c

···
 		p->state == BR_STATE_FORWARDING;
 }
 
-static inline unsigned int packet_length(const struct sk_buff *skb)
-{
-	return skb->len - (skb->protocol == htons(ETH_P_8021Q) ? VLAN_HLEN : 0);
-}
-
 int br_dev_queue_push_xmit(struct sk_buff *skb)
 {
 	/* ip_fragment doesn't copy the MAC header */
 	if (nf_bridge_maybe_copy_header(skb) ||
-	    (packet_length(skb) > skb->dev->mtu && !skb_is_gso(skb))) {
+	    !is_skb_forwardable(skb->dev, skb)) {
 		kfree_skb(skb);
 	} else {
 		skb_push(skb, ETH_HLEN);
···
 	skb->dev = to->dev;
 
 	if (unlikely(netpoll_tx_running(to->br->dev))) {
-		if (packet_length(skb) > skb->dev->mtu && !skb_is_gso(skb))
+		if (!is_skb_forwardable(skb->dev, skb))
 			kfree_skb(skb);
 		else {
 			skb_push(skb, ETH_HLEN);

net/core/dev.c

···
 			__net_timestamp(SKB);		\
 	}						\
 
-static inline bool is_skb_forwardable(struct net_device *dev,
-				      struct sk_buff *skb)
+bool is_skb_forwardable(struct net_device *dev, struct sk_buff *skb)
 {
 	unsigned int len;
 
···
 
 	return false;
 }
+EXPORT_SYMBOL_GPL(is_skb_forwardable);
 
 /**
  * dev_forward_skb - loopback an skb to another netif