net: more accurate checksumming in validate_xmit_skb()
skb_csum_hwoffload_help() uses netdev features and skb->csum_not_inet to determine if skb needs software computation of Internet Checksum or crc32c (or nothing, if this computation can be done by the hardware). Use it in place of skb_checksum_help() in validate_xmit_skb() to avoid corruption of non-GSO SCTP packets having skb->ip_summed equal to CHECKSUM_PARTIAL. While at it, remove references to skb_csum_off_chk* functions, since they are not present anymore in Linux _ see commit cf53b1da ("Revert "net: Add driver helper functions to determine checksum offloadability""). Signed-off-by: NDavide Caratti <dcaratti@redhat.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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