linux-kernel - Re: [PATCH net 1/2] mptcp: only inc MPJoinAckHMacFailure for HMAC failures

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Message-ID: <20250408164930.GF395307@horms.kernel.org>
Date: Tue, 8 Apr 2025 17:49:30 +0100
From: Simon Horman <horms@...nel.org>
To: "Matthieu Baerts (NGI0)" <matttbe@...nel.org>
Cc: mptcp@...ts.linux.dev, Mat Martineau <martineau@...nel.org>,
	Geliang Tang <geliang@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Shuah Khan <shuah@...nel.org>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH net 1/2] mptcp: only inc MPJoinAckHMacFailure for HMAC
 failures

On Mon, Apr 07, 2025 at 08:26:32PM +0200, Matthieu Baerts (NGI0) wrote:
> Recently, during a debugging session using local MPTCP connections, I
> noticed MPJoinAckHMacFailure was not zero on the server side. The
> counter was in fact incremented when the PM rejected new subflows,
> because the 'subflow' limit was reached.
> 
> The fix is easy, simply dissociating the two cases: only the HMAC
> validation check should increase MPTCP_MIB_JOINACKMAC counter.
> 
> Fixes: 4cf8b7e48a09 ("subflow: introduce and use mptcp_can_accept_new_subflow()")
> Cc: stable@...r.kernel.org
> Reviewed-by: Geliang Tang <geliang@...nel.org>
> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@...nel.org>

Reviewed-by: Simon Horman <horms@...nel.org>