+ if (!(pkt_dev->flags & F_UDPCSUM)) {
+ skb->ip_summed = CHECKSUM_NONE;
+ } else if (odev->features & NETIF_F_V6_CSUM) {
+ skb->ip_summed = CHECKSUM_PARTIAL;
+ skb->csum_start = skb_transport_header(skb) - skb->head;
+ skb->csum_offset = offsetof(struct udphdr, check);
+ udph->check = ~csum_ipv6_magic(&iph->saddr, &iph->daddr, udplen, IPPROTO_UDP, 0);
+ } else {
+ __wsum csum = udp_csum(skb);
+
+ /* add protocol-dependent pseudo-header */
+ udph->check = csum_ipv6_magic(&iph->saddr, &iph->daddr, udplen, IPPROTO_UDP, csum);
+
+ if (udph->check == 0)
+ udph->check = CSUM_MANGLED_0;
+ }
+