is_maxswin
sp->is_maxswin, sp->is_swinscale,
is->is_maxswin = ntohs(tcp->th_win);
if (is->is_maxswin == 0)
is->is_maxswin = 1;
is->is_maxdwin = is->is_maxswin * 2;
clone->is_maxswin = 1;
clone->is_maxswin = ntohs(tcp->th_win);
if (clone->is_maxswin == 0)
clone->is_maxswin = 1;
st->stu_data[0].td_maxwin = ips->is_maxswin;
is->is_maxswin = su.stu_data[0].td_maxwin;