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 CC32AC07E9E for ; Mon, 12 Jul 2021 07:03:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AEFAE61289 for ; Mon, 12 Jul 2021 07:03:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242957AbhGLHES (ORCPT ); Mon, 12 Jul 2021 03:04:18 -0400 Received: from mail.kernel.org ([198.145.29.99]:41504 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238040AbhGLGqt (ORCPT ); Mon, 12 Jul 2021 02:46:49 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 8E4FA6121E; Mon, 12 Jul 2021 06:42:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1626072147; bh=ofC5oRRWzFCiyWfMVsYGmrP6k09mpDAOH7LMQNqNYVI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Hv3K5qiq0pyGFOKbI+2ae26NkD6YTdCJRbJoYxI+WrIfCLXrXDQKcVImYqPjGkjJA eRPbg+Gpnv+3Ah3WV+jiVeMSG0RqIklz/9d6O78NAK/yuhHvZtqF8NGpMVvjgO5c9Q rgXPW3oQRjeX3JPZfehWVOAPm2aeghf6ZkB0coYg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Stephen Suryaputra , Paolo Abeni , Antoine Tenart , David Ahern , "David S. Miller" , Sasha Levin Subject: [PATCH 5.10 373/593] vrf: do not push non-ND strict packets with a source LLA through packet taps again Date: Mon, 12 Jul 2021 08:08:53 +0200 Message-Id: <20210712060927.799307114@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210712060843.180606720@linuxfoundation.org> References: <20210712060843.180606720@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: Antoine Tenart [ Upstream commit 603113c514e95c3350598bc3cccbd03af7ea4ab2 ] Non-ND strict packets with a source LLA go through the packet taps again, while non-ND strict packets with other source addresses do not, and we can see a clone of those packets on the vrf interface (we should not). This is due to a series of changes: Commit 6f12fa775530[1] made non-ND strict packets not being pushed again in the packet taps. This changed with commit 205704c618af[2] for those packets having a source LLA, as they need a lookup with the orig_iif. The issue now is those packets do not skip the 'vrf_ip6_rcv' function to the end (as the ones without a source LLA) and go through the check to call packet taps again. This check was changed by commit 6f12fa775530[1] and do not exclude non-strict packets anymore. Packets matching 'need_strict && !is_ndisc && is_ll_src' are now being sent through the packet taps again. This can be seen by dumping packets on the vrf interface. Fix this by having the same code path for all non-ND strict packets and selectively lookup with the orig_iif for those with a source LLA. This has the effect to revert to the pre-205704c618af[2] condition, which should also be easier to maintain. [1] 6f12fa775530 ("vrf: mark skb for multicast or link-local as enslaved to VRF") [2] 205704c618af ("vrf: packets with lladdr src needs dst at input with orig_iif when needs strict") Fixes: 205704c618af ("vrf: packets with lladdr src needs dst at input with orig_iif when needs strict") Cc: Stephen Suryaputra Reported-by: Paolo Abeni Signed-off-by: Antoine Tenart Reviewed-by: David Ahern Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/vrf.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/net/vrf.c b/drivers/net/vrf.c index bc96ac0c5769..2746f77745e4 100644 --- a/drivers/net/vrf.c +++ b/drivers/net/vrf.c @@ -1312,22 +1312,22 @@ static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev, int orig_iif = skb->skb_iif; bool need_strict = rt6_need_strict(&ipv6_hdr(skb)->daddr); bool is_ndisc = ipv6_ndisc_frame(skb); - bool is_ll_src; /* loopback, multicast & non-ND link-local traffic; do not push through * packet taps again. Reset pkt_type for upper layers to process skb. - * for packets with lladdr src, however, skip so that the dst can be - * determine at input using original ifindex in the case that daddr - * needs strict + * For strict packets with a source LLA, determine the dst using the + * original ifindex. */ - is_ll_src = ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL; - if (skb->pkt_type == PACKET_LOOPBACK || - (need_strict && !is_ndisc && !is_ll_src)) { + if (skb->pkt_type == PACKET_LOOPBACK || (need_strict && !is_ndisc)) { skb->dev = vrf_dev; skb->skb_iif = vrf_dev->ifindex; IP6CB(skb)->flags |= IP6SKB_L3SLAVE; + if (skb->pkt_type == PACKET_LOOPBACK) skb->pkt_type = PACKET_HOST; + else if (ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) + vrf_ip6_input_dst(skb, vrf_dev, orig_iif); + goto out; } -- 2.30.2