check_ksize
if (!check_ksize(xtp->xt_len, struct xtcpcb))
if (!check_ksize(xip->xi_len, struct xinpcb))
if (!check_ksize(xug->xug_len, struct xunpgen) ||
!check_ksize(exug->xug_len, struct xunpgen))
if (!check_ksize(xup->xu_len, struct xunpcb))