nd_opt_rdnss
__CTASSERT(sizeof(struct nd_opt_rdnss) == 8);
struct nd_opt_rdnss *ndopt_rdnss;
packlen += sizeof(struct nd_opt_rdnss);
ndopt_rdnss = (struct nd_opt_rdnss *)buf;
((optlen < (int)sizeof(struct nd_opt_rdnss) ||
(optlen - sizeof(struct nd_opt_rdnss)) % 16 != 0))) ||