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mptcp: count CLOSE-WAIT sockets for MPTCP_MIB_CURRESTAB

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[ Upstream commit 9633e9377e6af0244f7381e86b9aac5276f5be97 ]

Like previous patch does in TCP, we need to adhere to RFC 1213:

  "tcpCurrEstab OBJECT-TYPE
   ...
   The number of TCP connections for which the current state
   is either ESTABLISHED or CLOSE- WAIT."

So let's consider CLOSE-WAIT sockets.

The logic of counting
When we increment the counter?
a) Only if we change the state to ESTABLISHED.

When we decrement the counter?
a) if the socket leaves ESTABLISHED and will never go into CLOSE-WAIT,
say, on the client side, changing from ESTABLISHED to FIN-WAIT-1.
b) if the socket leaves CLOSE-WAIT, say, on the server side, changing
from CLOSE-WAIT to LAST-ACK.

Fixes: d9cd27b8cd19 ("mptcp: add CurrEstab MIB counter support")
Signed-off-by: Jason Xing <kernelxing@tencent.com>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jason Xing 2024-06-04 01:02:17 +08:00 committed by Greg Kroah-Hartman
parent acdf17546e
commit 3dd41669b3
1 changed files with 7 additions and 2 deletions
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9
net/mptcp/protocol.c
View File

@ -2873,9 +2873,14 @@ void mptcp_set_state(struct sock *sk, int state)
if (oldstate != TCP_ESTABLISHED)
MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_CURRESTAB);
break;
case TCP_CLOSE_WAIT:
/* Unlike TCP, MPTCP sk would not have the TCP_SYN_RECV state:
* MPTCP "accepted" sockets will be created later on. So no
* transition from TCP_SYN_RECV to TCP_CLOSE_WAIT.
*/
break;
default:
if (oldstate == TCP_ESTABLISHED)
if (oldstate == TCP_ESTABLISHED || oldstate == TCP_CLOSE_WAIT)
MPTCP_DEC_STATS(sock_net(sk), MPTCP_MIB_CURRESTAB);
}