From patchwork Tue Jun 1 12:30:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Boris Sukholitko X-Patchwork-Id: 453139 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=-19.1 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, USER_AGENT_GIT autolearn=ham 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 3E886C4708F for ; Tue, 1 Jun 2021 12:31:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 239E461009 for ; Tue, 1 Jun 2021 12:31:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233851AbhFAMdZ (ORCPT ); Tue, 1 Jun 2021 08:33:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55574 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233758AbhFAMdY (ORCPT ); Tue, 1 Jun 2021 08:33:24 -0400 Received: from mail-pl1-x62b.google.com (mail-pl1-x62b.google.com [IPv6:2607:f8b0:4864:20::62b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1C40AC06174A for ; Tue, 1 Jun 2021 05:31:43 -0700 (PDT) Received: by mail-pl1-x62b.google.com with SMTP id 11so3281312plk.12 for ; Tue, 01 Jun 2021 05:31:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version; bh=CSKJOxqdRaom0HInT9myOFg90Owwx3Ot/+iu5LRyITQ=; b=W/UxYmbbWOkxoufFDu2MsMDxQA3R0APaptJBMcXLyTcXX31tV2tb98XhaQHPURn2TJ I3UMGhayJubo2BdZCxvdgbR4eVUGoyXS1ircvacX0xqla9EsR0Z6WlYxs6svb6fdnyC/ +iqYg2bI8lxnu+djY0MYK98soROmaLhWxgpyg= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version; bh=CSKJOxqdRaom0HInT9myOFg90Owwx3Ot/+iu5LRyITQ=; b=LUACuZgRWAzvM9dNossa4Ia3koPPkNq3Qbae1F4T9yfMdUydgxrcKl+1fzw9JLVjNL O/H1MGBnjIlXie2xegD40coSHEqYfl7IeC/5y9wAYZXFFt72qs1NUsUxLRs2ywFqr949 57nSJLWsnb635BNy/CzOg+UF3KEGC7k0EShD+F5I92Yam2GKC99a5KIdONE0v0y2WTO5 +k5UDoZqoe6MZDgDCuwexVomxmNChgOBn/DwU6eY14TsWkTE1OBKMVplrl/jLL/otTZR nMhXt9p+uMz7CLwOQBzC1qUT/kjge/x0W9F+Di41bE/BS/twvDwCoJPNx3WLDqPDhiSR yi5g== X-Gm-Message-State: AOAM533RtsDIF8b8W0ip+xtUBvwdfMzANxkSwr7Ag/sPb+Ma204z2LEH 26anpxmnJjiSqnqpb7wxg7zWtcoHE1WGFBedg1lrTA/ge8l2NVBnFVZMqb6yzdrHzeNtMpYfjPQ 5gBhS39UaK9lLC/ZnUPLrEwjTRwFa9ftAtF9QmCXo9Y1P97oSOcTexvTkBgwsFLX9L3FoTuGMVY tuklZ4LJg= X-Google-Smtp-Source: ABdhPJzAcDn5U2RdAcN7oQ9fvqORdTVUVPYzHUVtM5/MBnRAa9zKlKIIezEj1oogtsznH9Q7BnN9fg== X-Received: by 2002:a17:90a:4817:: with SMTP id a23mr4898086pjh.192.1622550702241; Tue, 01 Jun 2021 05:31:42 -0700 (PDT) Received: from localhost.localdomain ([192.19.250.250]) by smtp.gmail.com with ESMTPSA id p19sm13887734pgi.59.2021.06.01.05.31.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 01 Jun 2021 05:31:41 -0700 (PDT) From: Boris Sukholitko To: netdev@vger.kernel.org, Jamal Hadi Salim , Jiri Pirko , Cong Wang Cc: "David S . Miller" , linux-kselftest@vger.kernel.org, shuah@kernel.org, Ilya Lifshits , Shmulik Ladkani , Jakub Kicinski , Davide Caratti , Boris Sukholitko Subject: [PATCH net-next v4 1/3] net/sched: act_vlan: Fix modify to allow 0 Date: Tue, 1 Jun 2021 15:30:50 +0300 Message-Id: <20210601123052.3887-2-boris.sukholitko@broadcom.com> X-Mailer: git-send-email 2.29.3 In-Reply-To: <20210601123052.3887-1-boris.sukholitko@broadcom.com> References: <20210601123052.3887-1-boris.sukholitko@broadcom.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Currently vlan modification action checks existence of vlan priority by comparing it to 0. Therefore it is impossible to modify existing vlan tag to have priority 0. For example, the following tc command will change the vlan id but will not affect vlan priority: tc filter add dev eth1 ingress matchall action vlan modify id 300 \ priority 0 pipe mirred egress redirect dev eth2 The incoming packet on eth1: ethertype 802.1Q (0x8100), vlan 200, p 4, ethertype IPv4 will be changed to: ethertype 802.1Q (0x8100), vlan 300, p 4, ethertype IPv4 although the user has intended to have p == 0. The fix is to add tcfv_push_prio_exists flag to struct tcf_vlan_params and rely on it when deciding to set the priority. Fixes: 45a497f2d149a4a8061c (net/sched: act_vlan: Introduce TCA_VLAN_ACT_MODIFY vlan action) Signed-off-by: Boris Sukholitko --- include/net/tc_act/tc_vlan.h | 1 + net/sched/act_vlan.c | 7 +++++-- 2 files changed, 6 insertions(+), 2 deletions(-) diff --git a/include/net/tc_act/tc_vlan.h b/include/net/tc_act/tc_vlan.h index f051046ba034..f94b8bc26f9e 100644 --- a/include/net/tc_act/tc_vlan.h +++ b/include/net/tc_act/tc_vlan.h @@ -16,6 +16,7 @@ struct tcf_vlan_params { u16 tcfv_push_vid; __be16 tcfv_push_proto; u8 tcfv_push_prio; + bool tcfv_push_prio_exists; struct rcu_head rcu; }; diff --git a/net/sched/act_vlan.c b/net/sched/act_vlan.c index 1cac3c6fbb49..a108469c664f 100644 --- a/net/sched/act_vlan.c +++ b/net/sched/act_vlan.c @@ -70,7 +70,7 @@ static int tcf_vlan_act(struct sk_buff *skb, const struct tc_action *a, /* replace the vid */ tci = (tci & ~VLAN_VID_MASK) | p->tcfv_push_vid; /* replace prio bits, if tcfv_push_prio specified */ - if (p->tcfv_push_prio) { + if (p->tcfv_push_prio_exists) { tci &= ~VLAN_PRIO_MASK; tci |= p->tcfv_push_prio << VLAN_PRIO_SHIFT; } @@ -121,6 +121,7 @@ static int tcf_vlan_init(struct net *net, struct nlattr *nla, struct tc_action_net *tn = net_generic(net, vlan_net_id); struct nlattr *tb[TCA_VLAN_MAX + 1]; struct tcf_chain *goto_ch = NULL; + bool push_prio_exists = false; struct tcf_vlan_params *p; struct tc_vlan *parm; struct tcf_vlan *v; @@ -189,7 +190,8 @@ static int tcf_vlan_init(struct net *net, struct nlattr *nla, push_proto = htons(ETH_P_8021Q); } - if (tb[TCA_VLAN_PUSH_VLAN_PRIORITY]) + push_prio_exists = !!tb[TCA_VLAN_PUSH_VLAN_PRIORITY]; + if (push_prio_exists) push_prio = nla_get_u8(tb[TCA_VLAN_PUSH_VLAN_PRIORITY]); break; case TCA_VLAN_ACT_POP_ETH: @@ -241,6 +243,7 @@ static int tcf_vlan_init(struct net *net, struct nlattr *nla, p->tcfv_action = action; p->tcfv_push_vid = push_vid; p->tcfv_push_prio = push_prio; + p->tcfv_push_prio_exists = push_prio_exists || action == TCA_VLAN_ACT_PUSH; p->tcfv_push_proto = push_proto; if (action == TCA_VLAN_ACT_PUSH_ETH) {