dst_sum 19 net/ipv6/netfilter/ip6t_NPT.c __wsum src_sum, dst_sum; dst_sum 33 net/ipv6/netfilter/ip6t_NPT.c dst_sum = csum_partial(&npt->dst_pfx.in6, sizeof(npt->dst_pfx.in6), 0); dst_sum 35 net/ipv6/netfilter/ip6t_NPT.c npt->adjustment = ~csum_fold(csum_sub(src_sum, dst_sum));