TH_CWR
if (f & TH_CWR)
if (tcp.th_flags & TH_CWR)
if (tiflags & TH_CWR) {
(tiflags & (TH_SYN|TH_FIN|TH_RST|TH_URG|TH_ECE|TH_CWR|TH_ACK))
flags |= TH_ECE|TH_CWR;
flags |= TH_ECE|TH_CWR;
flags |= TH_CWR;
if ((th->th_flags & (TH_ECE|TH_CWR)) && tcp_do_ecn)
case 'W': tfl |= TH_CWR; break;
if (tfl & TH_CWR) buf[i++] = 'W';
#ifndef TH_CWR
pf(TH_CWR, "CWR");