From nobody Sun Feb 8 22:58:30 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A8C93C001DE for ; Sun, 23 Jul 2023 15:07:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229834AbjGWPHd (ORCPT ); Sun, 23 Jul 2023 11:07:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54050 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229476AbjGWPHb (ORCPT ); Sun, 23 Jul 2023 11:07:31 -0400 Received: from mail-ej1-x62a.google.com (mail-ej1-x62a.google.com [IPv6:2a00:1450:4864:20::62a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2F75AF3 for ; Sun, 23 Jul 2023 08:07:30 -0700 (PDT) Received: by mail-ej1-x62a.google.com with SMTP id a640c23a62f3a-992acf67388so522634666b.1 for ; Sun, 23 Jul 2023 08:07:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fastly.com; s=google; t=1690124848; x=1690729648; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=JDolbZwxUR1dqTmWKJPBm9xAZkcLiWXKL3X8juy54I0=; b=O/JiitTXHFP0uR2DRWyLFH1VT54tr4N2dQ5DnWPJnLMNEzorUdFk/NfGRMjgKg7qmm 3nNtv6BWuA4DnciYCfXfiUHeaA2NgbXLjvAin94mQlXkCYvP2ZLApewcCkGPP9T3L9sD 9h9QsL2oYsGPrU9gB+t73IMPU9nhuqFj61ujk= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1690124848; x=1690729648; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=JDolbZwxUR1dqTmWKJPBm9xAZkcLiWXKL3X8juy54I0=; b=MBJT/1h1ri+vERZJN/WM1m+oFzv8F9yioYQxOt6ObrO3Rv3RitgeUQ1GuvvX0nbPJ4 qrLtS033TdwUQ/Ga9wP1i0zQbIjGo4umh7Fq5tZfzMeL6XL4SwiVLwj/UFX+OKPXEeZx g7k17zD1MDcp091N7HgczWgbgmGuQfWz+HflnAda4wcg2mtFfLRycvxZKv60NOXX3OBj kPIzVfLHjmBCTY1IvpFaeFl7ZqTkbKlKNHJpQceywVJGRpPYe3lnsuemPYkd0BGUwO8g 29wiiqXD9DtoYl4vz7tnIabYyXmvSNuv0tlKNEvg6pXPhFWsxnLwVquJNmiMlFw0bymF teAA== X-Gm-Message-State: ABy/qLb5HAa4vYUNEb+Ibhx0kNqx6bzZ2oUVIW3L0BJRABJ3oEfJL8uB GhW8yYtjFyugbUHM4UeBkFSDwQ== X-Google-Smtp-Source: APBJJlH4j2EBHuP2dwPwVY7QUDlOn2Aqu+8+9EXAcQe+eR8i5HPWOTYC3BzksTCU+N9cZ3h0t3dGpQ== X-Received: by 2002:a17:906:768f:b0:993:d8a2:385 with SMTP id o15-20020a170906768f00b00993d8a20385mr7300555ejm.22.1690124848600; Sun, 23 Jul 2023 08:07:28 -0700 (PDT) Received: from localhost.localdomain ([2620:11a:c019:0:65e:3115:2f58:c5fd]) by smtp.gmail.com with ESMTPSA id t10-20020a1709064f0a00b009929d998abcsm5227691eju.209.2023.07.23.08.07.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 23 Jul 2023 08:07:28 -0700 (PDT) From: Joe Damato To: netdev@vger.kernel.org, saeedm@nvidia.com, tariqt@nvidia.com, ecree@solarflare.com, andrew@lunn.ch, kuba@kernel.org, davem@davemloft.net, leon@kernel.org, pabeni@redhat.com, bhutchings@solarflare.com, arnd@arndb.de Cc: linux-kernel@vger.kernel.org, Joe Damato Subject: [net 1/2] net: ethtool: Unify ETHTOOL_{G,S}RXFH rxnfc copy Date: Sun, 23 Jul 2023 15:06:57 +0000 Message-Id: <20230723150658.241597-2-jdamato@fastly.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230723150658.241597-1-jdamato@fastly.com> References: <20230723150658.241597-1-jdamato@fastly.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" ETHTOOL_GRXFH correctly copies in the full struct ethtool_rxnfc when FLOW_RSS is set; ETHTOOL_SRXFH needs a similar code path to handle the FLOW_RSS case so that ethtool can set the flow hash for custom RSS contexts (if supported by the driver). The copy code from ETHTOOL_GRXFH has been pulled out in to a helper so that it can be called in both ETHTOOL_{G,S}RXFH code paths. Fixes: 84a1d9c48200 ("net: ethtool: extend RXNFC API to support RSS spreadi= ng of filter matches") Signed-off-by: Joe Damato Acked-by: Edward Cree --- net/ethtool/ioctl.c | 75 +++++++++++++++++++++++---------------------- 1 file changed, 38 insertions(+), 37 deletions(-) diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c index 4a51e0ec295c..7d40e7913e76 100644 --- a/net/ethtool/ioctl.c +++ b/net/ethtool/ioctl.c @@ -907,6 +907,38 @@ static int ethtool_rxnfc_copy_to_compat(void __user *u= seraddr, return 0; } =20 +static int ethtool_rxnfc_copy_struct(u32 cmd, struct ethtool_rxnfc *info, + size_t *info_size, void __user *useraddr) +{ + /* struct ethtool_rxnfc was originally defined for + * ETHTOOL_{G,S}RXFH with only the cmd, flow_type and data + * members. User-space might still be using that + * definition. + */ + if (cmd =3D=3D ETHTOOL_GRXFH || cmd =3D=3D ETHTOOL_SRXFH) + *info_size =3D (offsetof(struct ethtool_rxnfc, data) + + sizeof(info->data)); + + if (ethtool_rxnfc_copy_from_user(info, useraddr, *info_size)) + return -EFAULT; + + if ((cmd =3D=3D ETHTOOL_GRXFH || cmd =3D=3D ETHTOOL_SRXFH) && info->flow_= type & FLOW_RSS) { + *info_size =3D sizeof(*info); + if (ethtool_rxnfc_copy_from_user(info, useraddr, *info_size)) + return -EFAULT; + /* Since malicious users may modify the original data, + * we need to check whether FLOW_RSS is still requested. + */ + if (!(info->flow_type & FLOW_RSS)) + return -EINVAL; + } + + if (info->cmd !=3D cmd) + return -EINVAL; + + return 0; +} + static int ethtool_rxnfc_copy_to_user(void __user *useraddr, const struct ethtool_rxnfc *rxnfc, size_t size, const u32 *rule_buf) @@ -944,16 +976,9 @@ static noinline_for_stack int ethtool_set_rxnfc(struct= net_device *dev, if (!dev->ethtool_ops->set_rxnfc) return -EOPNOTSUPP; =20 - /* struct ethtool_rxnfc was originally defined for - * ETHTOOL_{G,S}RXFH with only the cmd, flow_type and data - * members. User-space might still be using that - * definition. */ - if (cmd =3D=3D ETHTOOL_SRXFH) - info_size =3D (offsetof(struct ethtool_rxnfc, data) + - sizeof(info.data)); - - if (ethtool_rxnfc_copy_from_user(&info, useraddr, info_size)) - return -EFAULT; + rc =3D ethtool_rxnfc_copy_struct(cmd, &info, &info_size, useraddr); + if (rc) + return rc; =20 rc =3D dev->ethtool_ops->set_rxnfc(dev, &info); if (rc) @@ -978,33 +1003,9 @@ static noinline_for_stack int ethtool_get_rxnfc(struc= t net_device *dev, if (!ops->get_rxnfc) return -EOPNOTSUPP; =20 - /* struct ethtool_rxnfc was originally defined for - * ETHTOOL_{G,S}RXFH with only the cmd, flow_type and data - * members. User-space might still be using that - * definition. */ - if (cmd =3D=3D ETHTOOL_GRXFH) - info_size =3D (offsetof(struct ethtool_rxnfc, data) + - sizeof(info.data)); - - if (ethtool_rxnfc_copy_from_user(&info, useraddr, info_size)) - return -EFAULT; - - /* If FLOW_RSS was requested then user-space must be using the - * new definition, as FLOW_RSS is newer. - */ - if (cmd =3D=3D ETHTOOL_GRXFH && info.flow_type & FLOW_RSS) { - info_size =3D sizeof(info); - if (ethtool_rxnfc_copy_from_user(&info, useraddr, info_size)) - return -EFAULT; - /* Since malicious users may modify the original data, - * we need to check whether FLOW_RSS is still requested. - */ - if (!(info.flow_type & FLOW_RSS)) - return -EINVAL; - } - - if (info.cmd !=3D cmd) - return -EINVAL; + ret =3D ethtool_rxnfc_copy_struct(cmd, &info, &info_size, useraddr); + if (ret) + return ret; =20 if (info.cmd =3D=3D ETHTOOL_GRXCLSRLALL) { if (info.rule_cnt > 0) { --=20 2.25.1