skb_push(skb, header_align);
memmove(skb->data, skb->data + header_align, header_length);
memmove(skb->data + header_length + l2pad,
skb_push(skb, header_align);
memmove(skb->data, skb->data + header_align, header_length);
memmove(skb->data + header_length + l2pad,