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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,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 716E0C4320E for ; Mon, 16 Aug 2021 13:04:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5CA2B632AF for ; Mon, 16 Aug 2021 13:04:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236760AbhHPNEt (ORCPT ); Mon, 16 Aug 2021 09:04:49 -0400 Received: from mail.kernel.org ([198.145.29.99]:55258 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236599AbhHPNEU (ORCPT ); Mon, 16 Aug 2021 09:04:20 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 95922632A7; Mon, 16 Aug 2021 13:03:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1629119029; bh=R0Mc7QO+yEoUaS4z/SSDX/RmdCS+x8sLx0+hl7F9KDU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pvZn5BvUfxfkm6l4AuLO0Bg0cHNnjW+pbOwApKadROlhm9aVOEBQZP3PRTEeOTs12 6Dtw+t/7hwNip3LVR2cSEzFsKktFJ/MY0tYSxj3YhlXIu155iyRLVmX/6q1a8uuE+A P/UfVp+bTY8+0CRNLdkAI/MRGst/6qnB3gROL0IY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Roi Dayan , Hangbin Liu , "David S. Miller" , Sasha Levin Subject: [PATCH 5.4 23/62] net: sched: act_mirred: Reset ct info when mirror/redirect skb Date: Mon, 16 Aug 2021 15:01:55 +0200 Message-Id: <20210816125428.980318023@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210816125428.198692661@linuxfoundation.org> References: <20210816125428.198692661@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Hangbin Liu [ Upstream commit d09c548dbf3b31cb07bba562e0f452edfa01efe3 ] When mirror/redirect a skb to a different port, the ct info should be reset for reclassification. Or the pkts will match unexpected rules. For example, with following topology and commands: ----------- | veth0 -+------- | veth1 -+------- | ------------ tc qdisc add dev veth0 clsact # The same with "action mirred egress mirror dev veth1" or "action mirred ingress redirect dev veth1" tc filter add dev veth0 egress chain 1 protocol ip flower ct_state +trk action mirred ingress mirror dev veth1 tc filter add dev veth0 egress chain 0 protocol ip flower ct_state -inv action ct commit action goto chain 1 tc qdisc add dev veth1 clsact tc filter add dev veth1 ingress chain 0 protocol ip flower ct_state +trk action drop ping & tc -s filter show dev veth1 ingress With command 'tc -s filter show', we can find the pkts were dropped on veth1. Fixes: b57dc7c13ea9 ("net/sched: Introduce action ct") Signed-off-by: Roi Dayan Signed-off-by: Hangbin Liu Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- net/sched/act_mirred.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/sched/act_mirred.c b/net/sched/act_mirred.c index 8327ef9793ef..e3ff884a48c5 100644 --- a/net/sched/act_mirred.c +++ b/net/sched/act_mirred.c @@ -261,6 +261,9 @@ static int tcf_mirred_act(struct sk_buff *skb, const struct tc_action *a, goto out; } + /* All mirred/redirected skbs should clear previous ct info */ + nf_reset_ct(skb2); + want_ingress = tcf_mirred_act_wants_ingress(m_eaction); expects_nh = want_ingress || !m_mac_header_xmit; -- 2.30.2