From nobody Sun May 19 23:34:09 2024 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 3169F1754F; Mon, 4 Mar 2024 08:26:22 +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=1709540783; cv=none; b=Nr8HAzQ6Z99B5JKWJhNCezV4QA6hzKjP4nxx14h26QhgjOtXSQJY2KuGOwFVsRdjmQk+TVeluaq9ZpknDK7iL8FvnI0ayO02sHg6Q2g80SkgERv+prcmiK0DpUZZXU13sEuuz3koGdB6KarkBTimhpSuS/E5DCGy0E7om8wXtuM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709540783; c=relaxed/simple; bh=u2d3iDyCibGC/QPgl0gXJ8IOUhnxC9ZtcMFxl7Y7i3U=; h=Subject:To:Cc:From:Date:In-Reply-To:Message-ID:MIME-Version: Content-Type; b=f2fsXbvVuoa+Q4seA5PE8LSG39d6rtG0yUFI3QtTf7ot+krMSdXGDG5YWZ4tpQqVPPhgCaeB2w3eS3DzRdCSCUr+NZ0h/Ry59dlk032tNWeVgaI9lBgOIXU1cVu5NjkP98YeB7tUyxLttNDL3LGIZCxMm8d9hpHgVeqKQtzh+Fg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=OBShbfc6; 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="OBShbfc6" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 06C41C433C7; Mon, 4 Mar 2024 08:26:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1709540782; bh=u2d3iDyCibGC/QPgl0gXJ8IOUhnxC9ZtcMFxl7Y7i3U=; h=Subject:To:Cc:From:Date:In-Reply-To:From; b=OBShbfc6U3TS3JcZPm794RcKQuz3pG/XNd3ii+baflMERnusNQegmHy79pAf6SL4U u6VDOPNlUs5MikrmI0V+Fd4S4Xg4MvRsb9PhCgBhKxSgr5g5Ki9Zu6p0jcSWigGRcb ATT7zd588/Yje+hAhBX2tCgrf9aGZmx581XHihO8= Subject: Patch "mptcp: process pending subflow error on close" has been added to the 5.15-stable tree To: davem@davemloft.net,gregkh@linuxfoundation.org,martineau@kernel.org,matthieu.baerts@tessares.net,matttbe@kernel.org,mptcp@lists.linux.dev,pabeni@redhat.com Cc: From: Date: Mon, 04 Mar 2024 09:26:09 +0100 In-Reply-To: <20240228173317.257282-2-matttbe@kernel.org> Message-ID: <2024030409-sandstorm-wool-af16@gregkh> Precedence: bulk X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-stable: commit X-Patchwork-Hint: ignore Content-Type: text/plain; charset="utf-8" This is a note to let you know that I've just added the patch titled mptcp: process pending subflow error on close to the 5.15-stable tree which can be found at: http://www.kernel.org/git/?p=3Dlinux/kernel/git/stable/stable-queue.git= ;a=3Dsummary The filename of the patch is: mptcp-process-pending-subflow-error-on-close.patch and it can be found in the queue-5.15 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. From stable+bounces-25403-greg=3Dkroah.com@vger.kernel.org Wed Feb 28 18:33= :29 2024 From: "Matthieu Baerts (NGI0)" Date: Wed, 28 Feb 2024 18:33:18 +0100 Subject: mptcp: process pending subflow error on close To: stable@vger.kernel.org, gregkh@linuxfoundation.org Cc: MPTCP Upstream , Paolo Abeni = , Mat Martineau , Matthieu Baerts , "David S . Miller" , Matthieu Baerts Message-ID: <20240228173317.257282-2-matttbe@kernel.org> From: Paolo Abeni commit 9f1a98813b4b686482e5ef3c9d998581cace0ba6 upstream. On incoming TCP reset, subflow closing could happen before error propagation. That in turn could cause the socket error being ignored, and a missing socket state transition, as reported by Daire-Byrne. Address the issues explicitly checking for subflow socket error at close time. To avoid code duplication, factor-out of __mptcp_error_report() a new helper implementing the relevant bits. Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/429 Fixes: 15cc10453398 ("mptcp: deliver ssk errors to msk") Cc: stable@vger.kernel.org Signed-off-by: Paolo Abeni Reviewed-by: Mat Martineau Signed-off-by: Matthieu Baerts Signed-off-by: David S. Miller Signed-off-by: Matthieu Baerts (NGI0) Signed-off-by: Greg Kroah-Hartman --- net/mptcp/protocol.c | 63 +++++++++++++++++++++++++++-------------------= ----- 1 file changed, 34 insertions(+), 29 deletions(-) --- a/net/mptcp/protocol.c +++ b/net/mptcp/protocol.c @@ -688,40 +688,44 @@ static bool __mptcp_ofo_queue(struct mpt return moved; } =20 -void __mptcp_error_report(struct sock *sk) +static bool __mptcp_subflow_error_report(struct sock *sk, struct sock *ssk) { - struct mptcp_subflow_context *subflow; - struct mptcp_sock *msk =3D mptcp_sk(sk); + int err =3D sock_error(ssk); + int ssk_state; =20 - mptcp_for_each_subflow(msk, subflow) { - struct sock *ssk =3D mptcp_subflow_tcp_sock(subflow); - int err =3D sock_error(ssk); - int ssk_state; + if (!err) + return false; =20 - if (!err) - continue; + /* only propagate errors on fallen-back sockets or + * on MPC connect + */ + if (sk->sk_state !=3D TCP_SYN_SENT && !__mptcp_check_fallback(mptcp_sk(sk= ))) + return false; =20 - /* only propagate errors on fallen-back sockets or - * on MPC connect - */ - if (sk->sk_state !=3D TCP_SYN_SENT && !__mptcp_check_fallback(msk)) - continue; + /* We need to propagate only transition to CLOSE state. + * Orphaned socket will see such state change via + * subflow_sched_work_if_closed() and that path will properly + * destroy the msk as needed. + */ + ssk_state =3D inet_sk_state_load(ssk); + if (ssk_state =3D=3D TCP_CLOSE && !sock_flag(sk, SOCK_DEAD)) + inet_sk_state_store(sk, ssk_state); + WRITE_ONCE(sk->sk_err, -err); + + /* This barrier is coupled with smp_rmb() in mptcp_poll() */ + smp_wmb(); + sk_error_report(sk); + return true; +} =20 - /* We need to propagate only transition to CLOSE state. - * Orphaned socket will see such state change via - * subflow_sched_work_if_closed() and that path will properly - * destroy the msk as needed. - */ - ssk_state =3D inet_sk_state_load(ssk); - if (ssk_state =3D=3D TCP_CLOSE && !sock_flag(sk, SOCK_DEAD)) - inet_sk_state_store(sk, ssk_state); - WRITE_ONCE(sk->sk_err, -err); - - /* This barrier is coupled with smp_rmb() in mptcp_poll() */ - smp_wmb(); - sk_error_report(sk); - break; - } +void __mptcp_error_report(struct sock *sk) +{ + struct mptcp_subflow_context *subflow; + struct mptcp_sock *msk =3D mptcp_sk(sk); + + mptcp_for_each_subflow(msk, subflow) + if (__mptcp_subflow_error_report(sk, mptcp_subflow_tcp_sock(subflow))) + break; } =20 /* In most cases we will be able to lock the mptcp socket. If its already @@ -2309,6 +2313,7 @@ static void __mptcp_close_ssk(struct soc /* close acquired an extra ref */ __sock_put(ssk); } + __mptcp_subflow_error_report(sk, ssk); release_sock(ssk); =20 sock_put(ssk); Patches currently in stable-queue which might be from kroah.com@vger.kernel= .org are queue-5.15/selftests-mptcp-add-missing-kconfig-for-nf-filter.patch queue-5.15/selftests-mptcp-add-missing-kconfig-for-nf-filter-in-v6.patch queue-5.15/mptcp-add-needs_id-for-netlink-appending-addr.patch queue-5.15/mptcp-rename-timer-related-helper-to-less-confusing-names.patch queue-5.15/mptcp-process-pending-subflow-error-on-close.patch queue-5.15/mptcp-clean-up-harmless-false-expressions.patch queue-5.15/mptcp-move-__mptcp_error_report-in-protocol.c.patch