int sd_rtnl_message_route_set_src_prefixlen(sd_rtnl_message *m, unsigned char prefixlen);
int sd_rtnl_message_route_set_scope(sd_rtnl_message *m, unsigned char scope);
int sd_rtnl_message_route_get_family(sd_rtnl_message *m, int *family);
int sd_rtnl_message_route_set_src_prefixlen(sd_rtnl_message *m, unsigned char prefixlen);
int sd_rtnl_message_route_set_scope(sd_rtnl_message *m, unsigned char scope);
int sd_rtnl_message_route_get_family(sd_rtnl_message *m, int *family);