[IPV4/IPV6]: In ip_fragment(), reset ip_summed field on SKB sub-frags.
If we forward a fragmented packet, we can have ip_summed set to CHECKSUM_HW or similar. This is fine for local protocol processing, but once if we are forwarding this packet we want to reset ip_summed to CHECKSUM_NONE. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
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