rt_plen2mask
struct sockaddr *mask = rt_plen2mask(rt, &sa_mask);
struct sockaddr *rt_plen2mask(const struct rtentry *, struct sockaddr_in6 *);
if_group_routechange(rt_key(rt), rt_plen2mask(rt, &sa_mask));
rt_plen2mask(nhrt->rt_parent, &sa_mask), NULL, RTP_ANY);
info.rti_info[RTAX_NETMASK] = rt_plen2mask(rt, &sa_mask);
struct sockaddr *rt_plen2mask(const struct rtentry *, struct sockaddr_in6 *);
info.rti_info[RTAX_NETMASK] = rt_plen2mask(rt, &sa_mask);
info.rti_info[RTAX_NETMASK] = rt_plen2mask(rt, &sa_mask);
info.rti_info[RTAX_NETMASK] = rt_plen2mask(rt, &sa_mask);
info.rti_info[RTAX_NETMASK] = rt_plen2mask(rt,