int netlink_setup_route(const struct in6_addr *addr, const int prefixlen,
const int ifindex, const struct in6_addr *gw,
const uint32_t metric, const bool add);
int netlink_setup_route(const struct in6_addr *addr, const int prefixlen,
const int ifindex, const struct in6_addr *gw,
const uint32_t metric, const bool add);