if_group_routechange
void if_group_routechange(const struct sockaddr *, const struct sockaddr *);
if_group_routechange(info->rti_info[RTAX_DST],
if_group_routechange(rt_key(rt), rt_plen2mask(rt, &sa_mask));
if_group_routechange(info->rti_info[RTAX_DST],