/* for IPv6, UDP checksum is mandatory */
if (ND_TTEST2(cp[0], length)) {
sum = udp6_cksum(ndo, ip6, up, length + sizeof(struct udphdr));
/* for IPv6, UDP checksum is mandatory */
if (ND_TTEST2(cp[0], length)) {
sum = udp6_cksum(ndo, ip6, up, length + sizeof(struct udphdr));