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[TCP]: TCP_DEFER_ACCEPT updates - process as established

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Change TCP_DEFER_ACCEPT implementation so that it transitions a
connection to ESTABLISHED after handshake is complete instead of
leaving it in SYN-RECV until some data arrvies. Place connection in
accept queue when first data packet arrives from slow path.

Benefits:
  - established connection is now reset if it never makes it
   to the accept queue

 - diagnostic state of established matches with the packet traces
   showing completed handshake

 - TCP_DEFER_ACCEPT timeouts are expressed in seconds and can now be
   enforced with reasonable accuracy instead of rounding up to next
   exponential back-off of syn-ack retry.

Signed-off-by: Patrick McManus <mcmanus@ducksong.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McManus 2008-03-21 16:33:01 -07:00 • committed by David S. Miller
parent e4c7884028
commit ec3c0982a2
9 changed files with 99 additions and 33 deletions
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5
net/ipv4/tcp_timer.c
View file

@ -481,6 +481,11 @@ static void tcp_keepalive_timer (unsigned long data)
goto death;
}
if (tp->defer_tcp_accept.request && sk->sk_state == TCP_ESTABLISHED) {
tcp_send_active_reset(sk, GFP_ATOMIC);
goto death;
}
if (!sock_flag(sk, SOCK_KEEPOPEN) || sk->sk_state == TCP_CLOSE)
goto out;