on SIOCAIFADDR_IN6 check if sin6_len is sane.  sync w/kame
on SIOCAIFADDR_IN6 check if sin6_len is sane.  sync w/kame

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars