dev_forward_skb
ret = dev_forward_skb(ipvlan->dev, nskb);
if (dev_forward_skb(ipvlan->dev, skb) == NET_RX_SUCCESS)
dev_forward_skb(ipvlan->phy_dev, skb);
dev_forward_skb(vlan->lowerdev, skb);
int dev_forward_skb(struct net_device *dev, struct sk_buff *skb);
EXPORT_SYMBOL_GPL(dev_forward_skb);
if (dev_forward_skb(dev, skb) == NET_RX_SUCCESS)