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=-10.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 A2ECAC43461 for ; Tue, 1 Sep 2020 17:14:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 82B0620767 for ; Tue, 1 Sep 2020 17:14:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598980482; bh=wyqBBs6DRhbv4mngafCrqfLALJJ6U+DOmckj9iMToVc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=cLetETplCgonO/wizWwjXevcFuYRjBjqxPqQecKrro9ph90oeO8E9D2VkuH3L7sub HtHHdDyVYIfcIYQbvok+mz4bUqFL26jN3mw8ks4XHQiMsQzr9weDutr0yL1+90ZIzF WdH9XmdgChPW9D5Aha9dDnuwVgvUhok0gkC6Py1w= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728846AbgIAROc (ORCPT ); Tue, 1 Sep 2020 13:14:32 -0400 Received: from mail.kernel.org ([198.145.29.99]:59502 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729191AbgIAPPQ (ORCPT ); Tue, 1 Sep 2020 11:15:16 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (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 7C2A9206FA; Tue, 1 Sep 2020 15:15:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598973316; bh=wyqBBs6DRhbv4mngafCrqfLALJJ6U+DOmckj9iMToVc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fARaCdoVZY+z3gDViQekFWHCkrtqnKSdk/xxRtbsR21n7TCGH8Y0fUbK43a1xLsW7 0X/8ga+bs4NSD3wWUDlFlZADoX25VIZAog+AFA0Teo9eu3mHJVrPKmvadJAM9/sben fc1bhd3X/Tko6tFdCb/RJcAv7U9kNT9BZkVVC/Bg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mark Tomlinson , "David S. Miller" Subject: [PATCH 4.9 06/78] gre6: Fix reception with IP6_TNL_F_RCV_DSCP_COPY Date: Tue, 1 Sep 2020 17:09:42 +0200 Message-Id: <20200901150925.055262359@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200901150924.680106554@linuxfoundation.org> References: <20200901150924.680106554@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Mark Tomlinson [ Upstream commit 272502fcb7cda01ab07fc2fcff82d1d2f73d43cc ] When receiving an IPv4 packet inside an IPv6 GRE packet, and the IP6_TNL_F_RCV_DSCP_COPY flag is set on the tunnel, the IPv4 header would get corrupted. This is due to the common ip6_tnl_rcv() function assuming that the inner header is always IPv6. This patch checks the tunnel protocol for IPv4 inner packets, but still defaults to IPv6. Fixes: 308edfdf1563 ("gre6: Cleanup GREv6 receive path, call common GRE functions") Signed-off-by: Mark Tomlinson Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/ipv6/ip6_tunnel.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) --- a/net/ipv6/ip6_tunnel.c +++ b/net/ipv6/ip6_tunnel.c @@ -871,7 +871,15 @@ int ip6_tnl_rcv(struct ip6_tnl *t, struc struct metadata_dst *tun_dst, bool log_ecn_err) { - return __ip6_tnl_rcv(t, skb, tpi, NULL, ip6ip6_dscp_ecn_decapsulate, + int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, + const struct ipv6hdr *ipv6h, + struct sk_buff *skb); + + dscp_ecn_decapsulate = ip6ip6_dscp_ecn_decapsulate; + if (tpi->proto == htons(ETH_P_IP)) + dscp_ecn_decapsulate = ip4ip6_dscp_ecn_decapsulate; + + return __ip6_tnl_rcv(t, skb, tpi, NULL, dscp_ecn_decapsulate, log_ecn_err); } EXPORT_SYMBOL(ip6_tnl_rcv);