Hi:
 
This patch adds skb_header_cloned which tells us whether we need to
copy the data before we can modify the header part of the skb.  Again,
what constitutes the header is left up to the users of the skb to define.

This patch then uses this function in e1000/tg3 to copy the data before
the TCP/IP header is modified.
 
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Cheers,
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