ip_rt_ioctl
int ip_rt_ioctl(struct net *, unsigned int cmd, struct rtentry *rt);
return ip_rt_ioctl(sock_net(sk), cmd, &rt);
err = ip_rt_ioctl(net, cmd, &rt);
if ((err = ip_rt_ioctl(&init_net, SIOCADDRT, &rm)) < 0) {