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Date:   Fri, 29 May 2020 10:35:11 -0700 (PDT)
From:   Mat Martineau <>
To:     Paolo Abeni <>
cc:, "David S. Miller" <>,
        Jakub Kicinski <>
Subject: Re: [PATCH net 1/3] mptcp: fix unblocking connect()

On Fri, 29 May 2020, Paolo Abeni wrote:

> Currently unblocking connect() on MPTCP sockets fails frequently.
> If mptcp_stream_connect() is invoked to complete a previously
> attempted unblocking connection, it will still try to create
> the first subflow via __mptcp_socket_create(). If the 3whs is
> completed and the 'can_ack' flag is already set, the latter
> will fail with -EINVAL.
> This change addresses the issue checking for pending connect and
> delegating the completion to the first subflow. Additionally
> do msk addresses and sk_state changes only when needed.
> Fixes: 2303f994b3e1 ("mptcp: Associate MPTCP context with TCP socket")
> Signed-off-by: Paolo Abeni <>
> ---
> net/mptcp/protocol.c | 20 ++++++++++++++++++--
> 1 file changed, 18 insertions(+), 2 deletions(-)

Reviewed-by: Mat Martineau <>

Mat Martineau

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