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net/tcp: add support for the CLOSE_WAIT state

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CLOSE-WAIT - represents waiting for a connection termination request
             from the local user.
      TCP A                                                TCP B

  1.  ESTABLISHED                                          ESTABLISHED
  2.  (Close)
      FIN-WAIT-1  --> <SEQ=100><ACK=300><CTL=FIN,ACK>  --> CLOSE-WAIT
  3.  FIN-WAIT-2  <-- <SEQ=300><ACK=101><CTL=ACK>      <-- CLOSE-WAIT
  4.                                                       (Close)
      TIME-WAIT   <-- <SEQ=300><ACK=101><CTL=FIN,ACK>  <-- LAST-ACK
  5.  TIME-WAIT   --> <SEQ=101><ACK=301><CTL=ACK>      --> CLOSED
  6.  (2 MSL)
      CLOSED

in the current state, we can continue to send data until the user
calls shutdown or close, then directly enter the TCP_LAST_ACK state

Signed-off-by: zhanghongyu <zhanghongyu@xiaomi.com>
This commit is contained in:
zhanghongyu
2025-08-06 21:40:47 +08:00
committed by Xiang Xiao
parent 292276101b
commit 746d68916f
10 changed files with 395 additions and 37 deletions
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net/tcp/tcp_timer.c
+3 -1
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@@ -623,6 +623,7 @@ void tcp_timer(FAR struct net_driver_s *dev, FAR struct tcp_conn_s *conn)
goto done;
case TCP_ESTABLISHED:
case TCP_CLOSE_WAIT:
/* In the ESTABLISHED state, we call upon the application
* to do the actual retransmit after which we jump into
@@ -673,7 +674,8 @@ void tcp_timer(FAR struct net_driver_s *dev, FAR struct tcp_conn_s *conn)
* connection has been established.
*/
else if ((conn->tcpstateflags & TCP_STATE_MASK) == TCP_ESTABLISHED)
else if ((conn->tcpstateflags & TCP_STATE_MASK) == TCP_ESTABLISHED ||
(conn->tcpstateflags & TCP_STATE_MASK) == TCP_CLOSE_WAIT)
{
#ifdef CONFIG_NET_TCP_KEEPALIVE
/* Is this an established connected with KeepAlive enabled? */