RTM_GETROUTE
nl_type = RTM_GETROUTE;
.hdr.nlmsg_type = RTM_GETROUTE,
struct nlmsghdr *hdr = snl_create_msg_request(&nw, RTM_GETROUTE);
struct nlmsghdr *hdr = snl_create_msg_request(&nw, RTM_GETROUTE);