From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CADFFC282C4 for ; Mon, 4 Feb 2019 11:10:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9C21A207E0 for ; Mon, 4 Feb 2019 11:10:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549278646; bh=20ymTtmY//YfJe8bCukmbRfQOq0OKsy/5HXrG4YdXyw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=s+4PtO3c/u3FnClw7KyLTRrhD5n+FbgyclTwnhO4xwhG84ep2NyubAOEj5Puh5jwW o/ddwrthHrti09D0kahrDxLnt7VE7LrEt/n2vIm71JJfz95GtQDKDB1VCAzwnBosd8 pMmB2cKbYlefaYwakHv0i7tl770xcbBkaiQigBvk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729022AbfBDKkK (ORCPT ); Mon, 4 Feb 2019 05:40:10 -0500 Received: from mail.kernel.org ([198.145.29.99]:38122 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728433AbfBDKkJ (ORCPT ); Mon, 4 Feb 2019 05:40:09 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B20E32070C; Mon, 4 Feb 2019 10:40:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549276809; bh=20ymTtmY//YfJe8bCukmbRfQOq0OKsy/5HXrG4YdXyw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=goDfRTyecaIz6jGvWCOrQGOYJrWu2VjG6VE0neZ2YEU83/fuHq2wiEvjo5Kq4TkAf 0Ed2y5PILup8CaJnco3PjiDTjxMNTkEYnwzi4aSXvIF51kLwKcMLnpjNElvgmVpxzl cyg9aRC+q9I6WlrKwK5v52Vfe4EbObpNwdZPBxjA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, bridge@lists.linux-foundation.org, Nkolay Aleksandrov , Roopa Prabhu , Stephen Hemminger , Yunjian Wang , "David S. Miller" Subject: [PATCH 4.4 05/65] net: bridge: Fix ethernet header pointer before check skb forwardable Date: Mon, 4 Feb 2019 11:35:58 +0100 Message-Id: <20190204103611.451902141@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190204103610.583715954@linuxfoundation.org> References: <20190204103610.583715954@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Yunjian Wang [ Upstream commit 28c1382fa28f2e2d9d0d6f25ae879b5af2ecbd03 ] The skb header should be set to ethernet header before using is_skb_forwardable. Because the ethernet header length has been considered in is_skb_forwardable(including dev->hard_header_len length). To reproduce the issue: 1, add 2 ports on linux bridge br using following commands: $ brctl addbr br $ brctl addif br eth0 $ brctl addif br eth1 2, the MTU of eth0 and eth1 is 1500 3, send a packet(Data 1480, UDP 8, IP 20, Ethernet 14, VLAN 4) from eth0 to eth1 So the expect result is packet larger than 1500 cannot pass through eth0 and eth1. But currently, the packet passes through success, it means eth1's MTU limit doesn't take effect. Fixes: f6367b4660dd ("bridge: use is_skb_forwardable in forward path") Cc: bridge@lists.linux-foundation.org Cc: Nkolay Aleksandrov Cc: Roopa Prabhu Cc: Stephen Hemminger Signed-off-by: Yunjian Wang Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/bridge/br_forward.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) --- a/net/bridge/br_forward.c +++ b/net/bridge/br_forward.c @@ -39,10 +39,10 @@ static inline int should_deliver(const s int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb) { + skb_push(skb, ETH_HLEN); if (!is_skb_forwardable(skb->dev, skb)) goto drop; - skb_push(skb, ETH_HLEN); br_drop_fake_rtable(skb); skb_sender_cpu_clear(skb); @@ -88,12 +88,11 @@ static void __br_deliver(const struct ne skb->dev = to->dev; if (unlikely(netpoll_tx_running(to->br->dev))) { + skb_push(skb, ETH_HLEN); if (!is_skb_forwardable(skb->dev, skb)) kfree_skb(skb); - else { - skb_push(skb, ETH_HLEN); + else br_netpoll_send_skb(to, skb); - } return; }