udph->dest = htons(np->remote_port);
udph->len = htons(udp_len);
udph->check = 0;
+ udph->check = csum_tcpudp_magic(htonl(np->local_ip),
+ htonl(np->remote_ip),
+ udp_len, IPPROTO_UDP,
+ csum_partial((unsigned char *)udph, udp_len, 0));
+ if (udph->check == 0)
+ udph->check = -1;
skb->nh.iph = iph = (struct iphdr *)skb_push(skb, sizeof(*iph));