ip6_route_add
int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags,
ip6_route_add(&cfg, gfp_flags, NULL);
ip6_route_add(&cfg, GFP_KERNEL, NULL);
ip6_route_add(&cfg, GFP_ATOMIC, NULL);
if (!ip6_route_add(&cfg, GFP_ATOMIC, NULL)) {
err = ip6_route_add(&cfg, GFP_KERNEL, NULL);
return ip6_route_add(&cfg, GFP_KERNEL, extack);