how packet stored in skb?

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  hello,
    

why is it neccessary to copy skb->data to skb->h.raw and skb->nh.raw in dev.c file?
I think the whole packet structure along with data and all headers are already mapped to skb structure and after receiving packet i think no function is using raw variables to process packet they only get values from skb structure.
regards,
parag.

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