skb->len

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Is there a reason why skb->len for skb->pkt_type=PACKET_OUTGOING is 14 bytes larger than for skb->pkt_type=PACKET_HOST?  I doubt its a coincidence that the size of the ethernet header is 14 bytes.  Also, I notice that skb->data starts at a different location (relative to the ethernet header) if its outgoing compared to incoming traffic.  Can anyone tell me why?

Regards,
Mazhar
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