From nobody Thu Sep 19 00:57:02 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 D10AB83CA1 for ; Fri, 19 Jul 2024 12:24:51 +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=1721391891; cv=none; b=qKBLdy80LzumNL55LXq8Q2afk0VAYt/QsjJcAXsCtcTqCV4ij9o7TzpkuLirl+TzrOeHh99hAIV6hsX6fJ17lWRO4dE0cnWoJHT+ky6Tmw1CQ9ntJwXukHkplxLE8OR1BnlTs08iS35FSS+86PWnmy9Ei16AC5AlejpaBe98FL0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721391891; c=relaxed/simple; bh=0xFMDS4qYHKOiwYm0etxgWoqfwa1KQQH9JL0qVq+ToY=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=PkeU0IsLPm2T6kl9r6R9ciIDhLgePkkJeyus40IRrXCwbdTBlZ6jfrQcoGFHAq7dIU7BDhPoqHuP44J9zKq0im4KudAqs4chH/L9HN0HIDlNaVRUBXCyP6yFyUvv+4qojCGvhnzinYGVlQZv3sv4nDRP7db0MOdr3gCb5jx/NdE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=hK7jsMGg; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="hK7jsMGg" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A6570C4AF0D; Fri, 19 Jul 2024 12:24:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1721391891; bh=0xFMDS4qYHKOiwYm0etxgWoqfwa1KQQH9JL0qVq+ToY=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=hK7jsMGgvT24VnVJerpCyyfpGb7utiau2HbJGHUxjUjNgOT4f0pN0PY4NkgReApT8 qYvSArm6y6svIb6OIoLKQKhy+RCB+ExVVauNnMtpP8Y/VNv2LI4MaCdR/QNGu+j1Si KjUuxyDgb7EYIQrAa0sQWhE5IlgVugBg6xUn1Bp8Zla286O0k4vrLcCSICjRbSq4mR mPIaY62Xxsz6TMBp66SH2bsKRm6mFATYujlGB4fQmUZTDfEZuJ5OgSDwrSS35fFqvg DFPlT3DoGW07xbq+u2fAK2euMhVBjBfhD0eJ01WpkGaV5waMcScg3rfTU6mXAJMiJd MNdlHTwDVSugw== From: "Matthieu Baerts (NGI0)" Date: Fri, 19 Jul 2024 14:24:26 +0200 Subject: [PATCH mptcp-net v3 15/20] mptcp: pm: only mark 'subflow' endp as available Precedence: bulk X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20240719-mptcp-pm-avail-v3-15-e96b5591ced3@kernel.org> References: <20240719-mptcp-pm-avail-v3-0-e96b5591ced3@kernel.org> In-Reply-To: <20240719-mptcp-pm-avail-v3-0-e96b5591ced3@kernel.org> To: mptcp@lists.linux.dev Cc: Paolo Abeni , "Matthieu Baerts (NGI0)" X-Mailer: b4 0.14.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=4021; i=matttbe@kernel.org; h=from:subject:message-id; bh=0xFMDS4qYHKOiwYm0etxgWoqfwa1KQQH9JL0qVq+ToY=; b=owEBbQKS/ZANAwAIAfa3gk9CaaBzAcsmYgBmmlsA5YdgSfZiQIPpsche40jiPS6YNaMUDnZvU soIFsEUXeKJAjMEAAEIAB0WIQToy4X3aHcFem4n93r2t4JPQmmgcwUCZppbAAAKCRD2t4JPQmmg c1vKEACKc5H450TOd++KcBl3GDYwPrAckuvfwtBlpYawm9bfpJsKMFjn/vdyy6kHJklgYGSBmq1 bFV0WGmVLFJED1YkVcompKJ6PlswGMRAgShnKHVNkV8XbcMUAuIUBonUC/z97hoOpdPsWVmXEHU jEogu4LArY2EdTs2sSppcs+ESkuEWLg3UUryMlLvr6DNh9iaccjBgoi9TuSNIbZ73rARH27dBIC W4IJBE20dNS8ZJwY8bHNo6yL/+J8DuW6Zb0F084/Ie0GHtg5yvsbwA8RmC+Mf12+SqFzZShpXFS uPcrmuq7xS1IDykmfrdvTJrMiFjMA+JnUdFGvjH+9n+f/XkKt3bVZCSHKF7SaekK/QL4G3Lx7Jp 8Jh73zNxMjPmIb149px+cMeiKZG6y/oHBYTOCNjRuILnrXu1KQ6H5b2kvF/YTdaRtgLG8EKSShB /hhqBuENqzsgp8j2fQPrLtuq+BsaFta5qTZcErsqaM8ognfDJ7F9g0Uul3Drf+Vxrug7LmYdB39 mHZPLjJi3xYGPw2eFmJWdImzEv3OMZmmvc90pMcROutM3BjJVjzdW5KyPlqDRIRS42fudraDjkL Cnm+IjbiAp9aW6n710SFfTnZTa1nv3OD9Hp18y/an3oGcnv4luQbKMDLSXCn6mfmtkoNcKp+9bA Zm/ko43gI2mpH2Q== X-Developer-Key: i=matttbe@kernel.org; a=openpgp; fpr=E8CB85F76877057A6E27F77AF6B7824F4269A073 Adding the following warning ... WARN_ON_ONCE(msk->pm.local_addr_used =3D=3D 0) ... before decrementing the local_addr_used counter helped to find a bug when running the "remove single address" subtest from the mptcp_join.sh selftests. Removing a 'signal' endpoint will trigger the removal of all subflows linked to this endpoint via mptcp_pm_nl_rm_addr_or_subflow() with rm_type =3D=3D MPTCP_MIB_RMSUBFLOW. This will decrement the local_addr_used counter, which is wrong in this case because this counter is linked to 'subflow' endpoints, and here it is a 'signal' endpoint that is being removed. Now, the counter is decremented, only if the ID is being used outside of mptcp_pm_nl_rm_addr_or_subflow(), only for 'subflow' endpoints, and if the ID is not 0 -- local_addr_used is not taking into account these ones. This marking of the ID as being available, and the decrement is done no matter if a subflow using this ID is currently available, because the subflow could have been closed before. Fixes: 06faa2271034 ("mptcp: remove multi addresses and subflows in PM") Signed-off-by: Matthieu Baerts (NGI0) --- net/mptcp/pm_netlink.c | 26 +++++++++++++++++--------- 1 file changed, 17 insertions(+), 9 deletions(-) diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c index a653ecc9e9ad..ea942c9f998f 100644 --- a/net/mptcp/pm_netlink.c +++ b/net/mptcp/pm_netlink.c @@ -834,10 +834,10 @@ static void mptcp_pm_nl_rm_addr_or_subflow(struct mpt= cp_sock *msk, if (rm_type =3D=3D MPTCP_MIB_RMSUBFLOW) __MPTCP_INC_STATS(sock_net(sk), rm_type); } - if (rm_type =3D=3D MPTCP_MIB_RMSUBFLOW) - __set_bit(rm_id ? rm_id : msk->mpc_endpoint_id, msk->pm.id_avail_bitmap= ); - else if (rm_type =3D=3D MPTCP_MIB_RMADDR) + + if (rm_type =3D=3D MPTCP_MIB_RMADDR) __MPTCP_INC_STATS(sock_net(sk), rm_type); + if (!removed) continue; =20 @@ -847,8 +847,6 @@ static void mptcp_pm_nl_rm_addr_or_subflow(struct mptcp= _sock *msk, if (rm_type =3D=3D MPTCP_MIB_RMADDR) { msk->pm.add_addr_accepted--; WRITE_ONCE(msk->pm.accept_addr, true); - } else if (rm_type =3D=3D MPTCP_MIB_RMSUBFLOW) { - msk->pm.local_addr_used--; } } } @@ -1426,6 +1424,14 @@ static bool mptcp_pm_remove_anno_addr(struct mptcp_s= ock *msk, return ret; } =20 +static void __mark_subflow_endp_available(struct mptcp_sock *msk, u8 id) +{ + /* If it was marked as used, and not ID 0, decrement local_addr_used */ + if (!__test_and_set_bit(id ? : msk->mpc_endpoint_id, msk->pm.id_avail_bit= map) && + id && !WARN_ON_ONCE(msk->pm.local_addr_used =3D=3D 0)) + msk->pm.local_addr_used--; +} + static int mptcp_nl_remove_subflow_and_signal_addr(struct net *net, const struct mptcp_pm_addr_entry *entry) { @@ -1459,11 +1465,11 @@ static int mptcp_nl_remove_subflow_and_signal_addr(= struct net *net, spin_lock_bh(&msk->pm.lock); mptcp_pm_nl_rm_subflow_received(msk, &list); spin_unlock_bh(&msk->pm.lock); - } else if (entry->flags & MPTCP_PM_ADDR_FLAG_SUBFLOW) { - /* If the subflow has been used, but now closed */ + } + + if (entry->flags & MPTCP_PM_ADDR_FLAG_SUBFLOW) { spin_lock_bh(&msk->pm.lock); - if (!__test_and_set_bit(entry->addr.id, msk->pm.id_avail_bitmap)) - msk->pm.local_addr_used--; + __mark_subflow_endp_available(msk, entry->addr.id); spin_unlock_bh(&msk->pm.lock); } =20 @@ -1501,6 +1507,7 @@ static int mptcp_nl_remove_id_zero_address(struct net= *net, spin_lock_bh(&msk->pm.lock); mptcp_pm_remove_addr(msk, &list); mptcp_pm_nl_rm_subflow_received(msk, &list); + __mark_subflow_endp_available(msk, 0); spin_unlock_bh(&msk->pm.lock); release_sock(sk); =20 @@ -1902,6 +1909,7 @@ static void mptcp_pm_nl_fullmesh(struct mptcp_sock *m= sk, =20 spin_lock_bh(&msk->pm.lock); mptcp_pm_nl_rm_subflow_received(msk, &list); + __mark_subflow_endp_available(msk, addr->id); mptcp_pm_create_subflow_or_signal_addr(msk); spin_unlock_bh(&msk->pm.lock); } --=20 2.45.2