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Taking route's header_len into account, and updating gre device needed_headroom will give better hints on upper bound of required headroom. This is useful if the gre traffic is xfrm'ed. Signed-off-by: Timo Teras <timo.teras@iki.fi> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>