RTM_F_CLONED
filter.flags = rtm->rtm_flags & (RTM_F_PREFIX | RTM_F_CLONED);
if (rtm->rtm_flags & ~(RTM_F_CLONED | RTM_F_PREFIX)) {
if (rtm->rtm_flags & RTM_F_CLONED)
r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED;
if (rtm->rtm_flags & RTM_F_CLONED)
rtm->rtm_flags |= RTM_F_CLONED;