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=-2.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED,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 6F3D6C43334 for ; Mon, 3 Sep 2018 16:53:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3385E20869 for ; Mon, 3 Sep 2018 16:53:51 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3385E20869 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728887AbeICVOp (ORCPT ); Mon, 3 Sep 2018 17:14:45 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:38202 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728151AbeICVOo (ORCPT ); Mon, 3 Sep 2018 17:14:44 -0400 Received: from localhost (ip-213-127-74-90.ip.prioritytelecom.net [213.127.74.90]) by mail.linuxfoundation.org (Postfix) with ESMTPSA id 8084FCF9; Mon, 3 Sep 2018 16:53:47 +0000 (UTC) From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Eyal Birger , Steffen Klassert , Sasha Levin Subject: [PATCH 4.4 03/80] vti6: fix PMTU caching and reporting on xmit Date: Mon, 3 Sep 2018 18:48:41 +0200 Message-Id: <20180903164934.309395709@linuxfoundation.org> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180903164934.171677301@linuxfoundation.org> References: <20180903164934.171677301@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Eyal Birger [ Upstream commit d6990976af7c5d8f55903bfb4289b6fb030bf754 ] When setting the skb->dst before doing the MTU check, the route PMTU caching and reporting is done on the new dst which is about to be released. Instead, PMTU handling should be done using the original dst. This is aligned with IPv4 VTI. Fixes: ccd740cbc6 ("vti6: Add pmtu handling to vti6_xmit.") Signed-off-by: Eyal Birger Signed-off-by: Steffen Klassert Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- net/ipv6/ip6_vti.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) --- a/net/ipv6/ip6_vti.c +++ b/net/ipv6/ip6_vti.c @@ -469,10 +469,6 @@ vti6_xmit(struct sk_buff *skb, struct ne goto tx_err_dst_release; } - skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); - skb_dst_set(skb, dst); - skb->dev = skb_dst(skb)->dev; - mtu = dst_mtu(dst); if (!skb->ignore_df && skb->len > mtu) { skb_dst(skb)->ops->update_pmtu(dst, NULL, skb, mtu); @@ -487,9 +483,14 @@ vti6_xmit(struct sk_buff *skb, struct ne htonl(mtu)); } - return -EMSGSIZE; + err = -EMSGSIZE; + goto tx_err_dst_release; } + skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); + skb_dst_set(skb, dst); + skb->dev = skb_dst(skb)->dev; + err = dst_output(t->net, skb->sk, skb); if (net_xmit_eval(err) == 0) { struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);