net/ipv4/tcp_input.c

330 	if (tp->ecn_flags & TCP_ECN_OK)
331 		tp->ecn_flags |= TCP_ECN_QUEUE_CWR;
337 		tcp_sk(sk)->ecn_flags &= ~TCP_ECN_DEMAND_CWR;
350 	tp->ecn_flags &= ~TCP_ECN_QUEUE_CWR;
363 		if (tp->ecn_flags & TCP_ECN_SEEN)
370 		if (!(tp->ecn_flags & TCP_ECN_DEMAND_CWR)) {
373 			tp->ecn_flags |= TCP_ECN_DEMAND_CWR;
375 		tp->ecn_flags |= TCP_ECN_SEEN;
380 		tp->ecn_flags |= TCP_ECN_SEEN;
387 	if (tcp_sk(sk)->ecn_flags & TCP_ECN_OK)
393 	if ((tp->ecn_flags & TCP_ECN_OK) && (!th->ece || th->cwr))
394 		tp->ecn_flags &= ~TCP_ECN_OK;
399 	if ((tp->ecn_flags & TCP_ECN_OK) && (!th->ece || !th->cwr))
400 		tp->ecn_flags &= ~TCP_ECN_OK;
405 	if (th->ece && !th->syn && (tp->ecn_flags & TCP_ECN_OK))