ipfw_check_nat64prefix
int ipfw_check_nat64prefix(const struct in6_addr *prefix, int length);
if (ipfw_check_nat64prefix(&prefix, plen) != 0)
if (ipfw_check_nat64prefix(&prefix, plen) != 0)
if (ipfw_check_nat64prefix(&cfg->prefix6,
if (ipfw_check_nat64prefix(&cfg->prefix6,