From patchwork Mon Sep 28 08:24:44 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steffen Klassert X-Patchwork-Id: 1372431 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=secunet.com Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4C0FvG30Tpz9sSn for ; Mon, 28 Sep 2020 18:25:14 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726686AbgI1IZN (ORCPT ); Mon, 28 Sep 2020 04:25:13 -0400 Received: from a.mx.secunet.com ([62.96.220.36]:48620 "EHLO a.mx.secunet.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726518AbgI1IY5 (ORCPT ); Mon, 28 Sep 2020 04:24:57 -0400 Received: from localhost (localhost [127.0.0.1]) by a.mx.secunet.com (Postfix) with ESMTP id 1814C2052E; Mon, 28 Sep 2020 10:24:56 +0200 (CEST) X-Virus-Scanned: by secunet Received: from a.mx.secunet.com ([127.0.0.1]) by localhost (a.mx.secunet.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id SxKa_IgU2IRy; Mon, 28 Sep 2020 10:24:55 +0200 (CEST) Received: from mail-essen-02.secunet.de (unknown [10.53.40.205]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by a.mx.secunet.com (Postfix) with ESMTPS id 8071320504; Mon, 28 Sep 2020 10:24:55 +0200 (CEST) Received: from mbx-essen-01.secunet.de (10.53.40.197) by mail-essen-02.secunet.de (10.53.40.205) with Microsoft SMTP Server (TLS) id 14.3.487.0; Mon, 28 Sep 2020 10:24:55 +0200 Received: from gauss2.secunet.de (10.182.7.193) by mbx-essen-01.secunet.de (10.53.40.197) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2044.4; Mon, 28 Sep 2020 10:24:54 +0200 Received: by gauss2.secunet.de (Postfix, from userid 1000) id 77DCC3184713; Mon, 28 Sep 2020 10:24:54 +0200 (CEST) From: Steffen Klassert To: David Miller CC: Herbert Xu , Steffen Klassert , Subject: [PATCH 2/8] espintcp: restore IP CB before handing the packet to xfrm Date: Mon, 28 Sep 2020 10:24:44 +0200 Message-ID: <20200928082450.29414-3-steffen.klassert@secunet.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200928082450.29414-1-steffen.klassert@secunet.com> References: <20200928082450.29414-1-steffen.klassert@secunet.com> MIME-Version: 1.0 X-ClientProxiedBy: cas-essen-01.secunet.de (10.53.40.201) To mbx-essen-01.secunet.de (10.53.40.197) X-EXCLAIMER-MD-CONFIG: 2c86f778-e09b-4440-8b15-867914633a10 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Sabrina Dubroca Xiumei reported a bug with espintcp over IPv6 in transport mode, because xfrm6_transport_finish expects to find IP6CB data (struct inet6_skb_cb). Currently, espintcp zeroes the CB, but the relevant part is actually preserved by previous layers (first set up by tcp, then strparser only zeroes a small part of tcp_skb_tb), so we can just relocate it to the start of skb->cb. Fixes: e27cca96cd68 ("xfrm: add espintcp (RFC 8229)") Reported-by: Xiumei Mu Signed-off-by: Sabrina Dubroca Signed-off-by: Steffen Klassert --- net/xfrm/espintcp.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/net/xfrm/espintcp.c b/net/xfrm/espintcp.c index 827ccdf2db57..1f08ebf7d80c 100644 --- a/net/xfrm/espintcp.c +++ b/net/xfrm/espintcp.c @@ -29,8 +29,12 @@ static void handle_nonesp(struct espintcp_ctx *ctx, struct sk_buff *skb, static void handle_esp(struct sk_buff *skb, struct sock *sk) { + struct tcp_skb_cb *tcp_cb = (struct tcp_skb_cb *)skb->cb; + skb_reset_transport_header(skb); - memset(skb->cb, 0, sizeof(skb->cb)); + + /* restore IP CB, we need at least IP6CB->nhoff */ + memmove(skb->cb, &tcp_cb->header, sizeof(tcp_cb->header)); rcu_read_lock(); skb->dev = dev_get_by_index_rcu(sock_net(sk), skb->skb_iif);