TCPF_LAST_ACK
TCPF_CLOSE_WAIT | TCPF_LAST_ACK | TCPF_CLOSING)
(TCPF_FIN_WAIT1 | TCPF_CLOSING | TCPF_LAST_ACK);
(1 << old_state) & (TCPF_CLOSING | TCPF_LAST_ACK)) {
(1 << sk->sk_state) & (TCPF_CLOSE_WAIT | TCPF_LAST_ACK |
TCPF_CLOSE_WAIT | TCPF_LAST_ACK)) {
(TCPF_FIN_WAIT1 | TCPF_CLOSING | TCPF_LAST_ACK)) &&