From patchwork Mon Jan 16 14:48:49 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Machon X-Patchwork-Id: 13103357 X-Patchwork-Delegate: kuba@kernel.org 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 01BDAC63797 for ; Mon, 16 Jan 2023 15:00:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232929AbjAPPAM (ORCPT ); Mon, 16 Jan 2023 10:00:12 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50458 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233013AbjAPO6x (ORCPT ); Mon, 16 Jan 2023 09:58:53 -0500 Received: from esa.microchip.iphmx.com (esa.microchip.iphmx.com [68.232.154.123]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9AE1E29E37; Mon, 16 Jan 2023 06:49:26 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1673880566; x=1705416566; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=2Tqi3KpyWQdTDFrBD3ehhSni+Parh9JnXVk3GWfFVhM=; b=AEnLhCeQahRp6w/KnEMoyzS3z/i1HsZCrB8NImNR+pu9izgcjqN+U+Qi TmK3vT/kwI1uXDDuMZF8zBBI8K3+/BTlGhKJeN1q159io6EFPr8CBrm3T 2nqyJVTaSkrAH5T3zyT9CYSSn0lVuac8apBfxGFyeLtJO5hFaz/wgEZB4 +KE4Sw9vtbecJyuNRXsyP5VKWsZMyfI3v9L6UWpBqrJfLO7rPEubVSgx7 bFYJcqr50zeV+mFaxNWXeary4vhO/8HM4w6/5hBbNy7YaKKcbvXYgmEyi kmX5kH5Ea+6i1bQPMerY1M5G7Lz7b5xDBy9VgN5Ztj6bqBtAhLLS0BJGU w==; X-IronPort-AV: E=Sophos;i="5.97,221,1669100400"; d="scan'208";a="195979368" Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa2.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 16 Jan 2023 07:49:15 -0700 Received: from chn-vm-ex02.mchp-main.com (10.10.85.144) by chn-vm-ex03.mchp-main.com (10.10.85.151) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.16; Mon, 16 Jan 2023 07:49:12 -0700 Received: from DEN-LT-70577.microchip.com (10.10.115.15) by chn-vm-ex02.mchp-main.com (10.10.85.144) with Microsoft SMTP Server id 15.1.2507.16 via Frontend Transport; Mon, 16 Jan 2023 07:49:09 -0700 From: Daniel Machon To: CC: , , , , , , , , , , , , , , , , Subject: [PATCH net-next v2 2/6] net: dcb: add new common function for set/del of app/rewr entries Date: Mon, 16 Jan 2023 15:48:49 +0100 Message-ID: <20230116144853.2446315-3-daniel.machon@microchip.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230116144853.2446315-1-daniel.machon@microchip.com> References: <20230116144853.2446315-1-daniel.machon@microchip.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org In preparation for DCB rewrite. Add a new function for setting and deleting both app and rewrite entries. Moving this into a separate function reduces duplicate code, as both type of entries requires the same set of checks. The function will now iterate through a configurable nested attribute (app or rewrite attr), validate each attribute and call the appropriate set- or delete function. Note that this function always checks for nla_len(attr_itr) < sizeof(struct dcb_app), which was only done in dcbnl_ieee_set and not in dcbnl_ieee_del prior to this patch. This means, that any userspace tool that used to shove in data < sizeof(struct dcb_app) would now receive -ERANGE. Signed-off-by: Daniel Machon Reviewed-by: Petr Machata --- net/dcb/dcbnl.c | 100 ++++++++++++++++++++++-------------------------- 1 file changed, 45 insertions(+), 55 deletions(-) diff --git a/net/dcb/dcbnl.c b/net/dcb/dcbnl.c index a76bdf6f0198..cb5319c6afe6 100644 --- a/net/dcb/dcbnl.c +++ b/net/dcb/dcbnl.c @@ -1099,6 +1099,41 @@ static int dcbnl_getapptrust(struct net_device *netdev, struct sk_buff *skb) return err; } +/* Set or delete APP table or rewrite table entries. The APP struct is validated + * and the appropriate callback function is called. + */ +static int dcbnl_app_table_setdel(struct nlattr *attr, + struct net_device *netdev, + int (*setdel)(struct net_device *dev, + struct dcb_app *app)) +{ + struct dcb_app *app_data; + enum ieee_attrs_app type; + struct nlattr *attr_itr; + int rem, err; + + nla_for_each_nested(attr_itr, attr, rem) { + type = nla_type(attr_itr); + + if (!dcbnl_app_attr_type_validate(type)) + continue; + + if (nla_len(attr_itr) < sizeof(struct dcb_app)) + return -ERANGE; + + app_data = nla_data(attr_itr); + + if (!dcbnl_app_selector_validate(type, app_data->selector)) + return -EINVAL; + + err = setdel(netdev, app_data); + if (err) + return err; + } + + return 0; +} + /* Handle IEEE 802.1Qaz/802.1Qau/802.1Qbb GET commands. */ static int dcbnl_ieee_fill(struct sk_buff *skb, struct net_device *netdev) { @@ -1568,36 +1603,11 @@ static int dcbnl_ieee_set(struct net_device *netdev, struct nlmsghdr *nlh, } if (ieee[DCB_ATTR_IEEE_APP_TABLE]) { - struct nlattr *attr; - int rem; - - nla_for_each_nested(attr, ieee[DCB_ATTR_IEEE_APP_TABLE], rem) { - enum ieee_attrs_app type = nla_type(attr); - struct dcb_app *app_data; - - if (!dcbnl_app_attr_type_validate(type)) - continue; - - if (nla_len(attr) < sizeof(struct dcb_app)) { - err = -ERANGE; - goto err; - } - - app_data = nla_data(attr); - - if (!dcbnl_app_selector_validate(type, - app_data->selector)) { - err = -EINVAL; - goto err; - } - - if (ops->ieee_setapp) - err = ops->ieee_setapp(netdev, app_data); - else - err = dcb_ieee_setapp(netdev, app_data); - if (err) - goto err; - } + err = dcbnl_app_table_setdel(ieee[DCB_ATTR_IEEE_APP_TABLE], + netdev, ops->ieee_setapp ?: + dcb_ieee_setapp); + if (err) + goto err; } if (ieee[DCB_ATTR_DCB_APP_TRUST_TABLE]) { @@ -1684,31 +1694,11 @@ static int dcbnl_ieee_del(struct net_device *netdev, struct nlmsghdr *nlh, return err; if (ieee[DCB_ATTR_IEEE_APP_TABLE]) { - struct nlattr *attr; - int rem; - - nla_for_each_nested(attr, ieee[DCB_ATTR_IEEE_APP_TABLE], rem) { - enum ieee_attrs_app type = nla_type(attr); - struct dcb_app *app_data; - - if (!dcbnl_app_attr_type_validate(type)) - continue; - - app_data = nla_data(attr); - - if (!dcbnl_app_selector_validate(type, - app_data->selector)) { - err = -EINVAL; - goto err; - } - - if (ops->ieee_delapp) - err = ops->ieee_delapp(netdev, app_data); - else - err = dcb_ieee_delapp(netdev, app_data); - if (err) - goto err; - } + err = dcbnl_app_table_setdel(ieee[DCB_ATTR_IEEE_APP_TABLE], + netdev, ops->ieee_delapp ?: + dcb_ieee_delapp); + if (err) + goto err; } err: