*
* Must be called with rcu_read_lock.
*
* Packets received by this function are in the following state:
* - skb->data points to the inner Ethernet header.
* - The inner Ethernet header is in the linear data area.
*
* Must be called with rcu_read_lock.
*
* Packets received by this function are in the following state:
* - skb->data points to the inner Ethernet header.
* - The inner Ethernet header is in the linear data area.