taglinefilesource code
ip_route_stamp229include/net/sock.hunsigned long    ip_route_stamp;    /* Route cache stamp */
ip_route_stamp606net/ipv4/ip_output.cif(!rt || sk->ip_route_stamp != rt_stamp ||
ip_route_stamp617net/ipv4/ip_output.csk->ip_route_stamp=rt_stamp;
ip_route_stamp568net/ipv4/udp.csk->ip_route_stamp = rt_stamp;