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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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include/nuttx/net/tcp.h
+4 -3
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@@ -88,9 +88,10 @@
# define TCP_ESTABLISHED 0x04
# define TCP_FIN_WAIT_1 0x05
# define TCP_FIN_WAIT_2 0x06
# define TCP_CLOSING 0x07
# define TCP_TIME_WAIT 0x08
# define TCP_LAST_ACK 0x09
# define TCP_CLOSE_WAIT 0x07
# define TCP_CLOSING 0x08
# define TCP_TIME_WAIT 0x09
# define TCP_LAST_ACK 0x0a
# define TCP_STOPPED 0x10 /* Bit 4: stopped */
/* Bit 5-7: Unused, but not available */