OPT_FITS
if ((tp->t_flags & TF_NOOPT) == 0 && OPT_FITS(TCPOLEN_MAXSEG)) {
OPT_FITS(TCPOLEN_WINDOW + TCPOLEN_NOP)) {
if (tcp_do_sack && OPT_FITS(TCPOLEN_SACK_PERMITTED)) {
if (OPT_FITS(TCPOLEN_TIMESTAMP)) {
if (!OPT_FITS(TCPOLEN_SIGNATURE))
if (OPT_FITS(sack_len + 2)) {
if (!OPT_FITS(TCPOLEN_EOL)) {
if (!OPT_FITS(TCPOLEN_PAD))