udp_v6_check
uh->check = ~udp_v6_check(len, &ip6->saddr, &ip6->daddr, 0);
uh->check = ~udp_v6_check(skb->len - udp_off, &ipv6->saddr,
uh->check = ~udp_v6_check(len, &ipv6h->saddr,
uh->check = udp_v6_check(ntohs(uh->len), &ip6h->saddr,
uh->check = ~udp_v6_check(gso_skb->len,
uh->check = ~udp_v6_check(len, saddr, daddr, 0);
uh->check = udp_v6_check(len, saddr, daddr, lco_csum(skb));
uh->check = ~udp_v6_check(len, saddr, daddr, 0);
uh->check = ~udp_v6_check(skb->len - nhoff, &ipv6h->saddr,
uh->check = udp_v6_check(skb->len, &ipv6h->saddr,