From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 33C6217279B; Wed, 3 Jul 2024 11:15:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720005337; cv=none; b=jw+221lwShA9V82WYpQl6Tv4fLvqJOOvinM75lreLoL15YP6I8frCcA7jtg9P6N8l0yvkcSPTzNnADseD2KpTZl3YxuGGHo9DurUjI7dTso9qBh2nc7IyI1W4HWo1AkhBvtRdYW+lz/EMeAWBzjeE4pY8asiO58+S4UOlG/EXew= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720005337; c=relaxed/simple; bh=OSV4yaTq8dd/OdAfzwGeM2erZkeCVVR/GyAYDSbKTMY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ZU/35L5vWvpoKNG+wJE/IrTw8zMJvm4RI01lSp16ZnZXRmsoiCF8t8DYzQOUURgOyRwKKbidGoqXimTFxzYCcMZ3xkZKiOzaKDhqQHNeBSkPs2AegRGluFYCq/+EBJBWNVb3+JJJkMmj/yI48N5aNlYWw7jBtwNLcYVqBCkgFLw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=fCI24eAn; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="fCI24eAn" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B0C96C2BD10; Wed, 3 Jul 2024 11:15:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1720005337; bh=OSV4yaTq8dd/OdAfzwGeM2erZkeCVVR/GyAYDSbKTMY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fCI24eAn9tnIskEq206lX3l81bKt/88gUz/7vOTFMs/zFP1SLl7/5Hpg2cpjeYTVG NJgrx5lfeKDlnhrejLKARXUtwg0XNRL2rP6QmJbYkmiy8TI3Ueyqb336f+ZqcYEDt2 zcp7wwAX955vcVzMyBpjlfMPFvbPajAFF6UisE8Y= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jason Xing , Eric Dumazet , "David S. Miller" , Sasha Levin Subject: [PATCH 5.15 017/356] tcp: count CLOSE-WAIT sockets for TCP_MIB_CURRESTAB Date: Wed, 3 Jul 2024 12:35:53 +0200 Message-ID: <20240703102913.751963530@linuxfoundation.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240703102913.093882413@linuxfoundation.org> References: <20240703102913.093882413@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jason Xing [ Upstream commit a46d0ea5c94205f40ecf912d1bb7806a8a64704f ] According to RFC 1213, we should also take CLOSE-WAIT sockets into consideration: "tcpCurrEstab OBJECT-TYPE ... The number of TCP connections for which the current state is either ESTABLISHED or CLOSE- WAIT." After this, CurrEstab counter will display the total number of ESTABLISHED and CLOSE-WAIT sockets. The logic of counting When we increment the counter? a) if we change the state to ESTABLISHED. b) if we change the state from SYN-RECEIVED to CLOSE-WAIT. 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. Please note: there are two chances that old state of socket can be changed to CLOSE-WAIT in tcp_fin(). One is SYN-RECV, the other is ESTABLISHED. So we have to take care of the former case. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Jason Xing Reviewed-by: Eric Dumazet Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- net/ipv4/tcp.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 9c7998377d6bd..31c572882b41f 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -2619,6 +2619,10 @@ void tcp_set_state(struct sock *sk, int state) if (oldstate != TCP_ESTABLISHED) TCP_INC_STATS(sock_net(sk), TCP_MIB_CURRESTAB); break; + case TCP_CLOSE_WAIT: + if (oldstate == TCP_SYN_RECV) + TCP_INC_STATS(sock_net(sk), TCP_MIB_CURRESTAB); + break; case TCP_CLOSE: if (oldstate == TCP_CLOSE_WAIT || oldstate == TCP_ESTABLISHED) @@ -2630,7 +2634,7 @@ void tcp_set_state(struct sock *sk, int state) inet_put_port(sk); fallthrough; default: - if (oldstate == TCP_ESTABLISHED) + if (oldstate == TCP_ESTABLISHED || oldstate == TCP_CLOSE_WAIT) TCP_DEC_STATS(sock_net(sk), TCP_MIB_CURRESTAB); } -- 2.43.0