addroute
addroute(rrt, &nh, ifcp);
addroute(rrt, &nh, ifcp);
addroute(rrt, &nh, ifcp);
addroute(rrt, &rrt->rrt_gw, ifcp);
int addroute(struct riprt *, const struct in6_addr *, struct ifc *);
addroute(rrt, &in6addr_loopback, loopifcp);