Constant netlink_packet_route::rtnl::constants::RTM_F_CLONED

pub const RTM_F_CLONED: u32 = 512;

This route is cloned. Cloned routes are routes coming from the cache instead of the FIB. For IPv4, the cache was removed in Linux 3.6 (see IPv4 route lookup on Linux for more information about IPv4 routing)