net: Generalize checksum_init functions
Create a general __skb_checksum_validate function (actually a macro) to subsume the various checksum_init functions. This function can either init the checksum, or do the full validation (logically checksum_init+skb_check_complete)-- a flag specifies if full vaidation is performed. Also, there is a flag to the function to indicate that zero checksums are allowed (to support optional UDP checksums). Added several stub functions for calling __skb_checksum_validate. Signed-off-by: Tom Herbert <therbert@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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