From nobody Wed Nov 27 06:44:42 2024 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (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 DE111770E4; Sun, 13 Oct 2024 07:17:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.176.79.56 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728803857; cv=none; b=Lf6iaSsiiizpgCkmaxoNaqX3Psr2n20dd3P0DcDNlgHMQBKN6NeRE729ftB2Wzfm56JpJdMHfxVW2EXenCAEwGb/pZML3X6/6xiH/h7KalYFjuBo98OvHMSvhCr/LRzHcvWRiaUBWndGNudQawbAN8hyZ5plafhlZQ5Wg9PUJxI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728803857; c=relaxed/simple; bh=czfDiGjk4LCl6mAPJecaovDyp8awkvEZyqj2LYUIptM=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=qzv5PKsJTlkr29N9E5rcQXbh0+mmOkLLyYsavZq0L0YBRkZ7PVLXZHC0TCOUyAJFJj7x265V8nx7dYy+72nh9Y8mUcWmi7ub6KsBz1uDL3/aHIyq9BtPMjyilHQVww/8SL+Nxf7sVTvJBTGxS8J8mX5lg9fxdk+23vrYgfW5dK8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=185.176.79.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.18.186.31]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4XRBWM0lRtz6K5fZ; Sun, 13 Oct 2024 15:17:03 +0800 (CST) Received: from frapeml500005.china.huawei.com (unknown [7.182.85.13]) by mail.maildlp.com (Postfix) with ESMTPS id 57856140114; Sun, 13 Oct 2024 15:17:31 +0800 (CST) Received: from china (10.200.201.82) by frapeml500005.china.huawei.com (7.182.85.13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Sun, 13 Oct 2024 09:17:25 +0200 From: Gur Stavi To: Gur Stavi CC: , , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Shuah Khan , Willem de Bruijn , Subject: [PATCH net-next v04 1/3] af_packet: allow fanout_add when socket is not RUNNING Date: Sun, 13 Oct 2024 10:15:25 +0300 Message-ID: <4f1a3c37dbef980ef044c4d2adf91c76e2eca14b.1728802323.git.gur.stavi@huawei.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) To frapeml500005.china.huawei.com (7.182.85.13) Content-Type: text/plain; charset="utf-8" PACKET socket can retain its fanout membership through link down and up and leave a fanout while closed regardless of link state. However, socket was forbidden from joining a fanout while it was not RUNNING. This patch allows PACKET socket to join fanout while not RUNNING. Socket can be RUNNING if it has a specified protocol. Either directly from packet_create (being implicitly bound to any interface) or following a successful bind. Socket RUNNING state is switched off if it is bound to an interface that went down. Instead of the test for RUNNING, this patch adds a test that socket can become RUNNING. Signed-off-by: Gur Stavi Reviewed-by: Willem de Bruijn --- net/packet/af_packet.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index f8942062f776..2ff4b251842d 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -1846,21 +1846,22 @@ static int fanout_add(struct sock *sk, struct fanou= t_args *args) err =3D -EINVAL; =20 spin_lock(&po->bind_lock); - if (packet_sock_flag(po, PACKET_SOCK_RUNNING) && + if (po->num && match->type =3D=3D type && match->prot_hook.type =3D=3D po->prot_hook.type && match->prot_hook.dev =3D=3D po->prot_hook.dev) { err =3D -ENOSPC; if (refcount_read(&match->sk_ref) < match->max_num_members) { - __dev_remove_pack(&po->prot_hook); - /* Paired with packet_setsockopt(PACKET_FANOUT_DATA) */ WRITE_ONCE(po->fanout, match); =20 po->rollover =3D rollover; rollover =3D NULL; refcount_set(&match->sk_ref, refcount_read(&match->sk_ref) + 1); - __fanout_link(sk, po); + if (packet_sock_flag(po, PACKET_SOCK_RUNNING)) { + __dev_remove_pack(&po->prot_hook); + __fanout_link(sk, po); + } err =3D 0; } } --=20 2.45.2