From patchwork Fri Sep 14 04:26:48 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Haishuang Yan X-Patchwork-Id: 969617 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=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=cmss.chinamobile.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 42BMtm0pFpz9s2P for ; Fri, 14 Sep 2018 14:27:28 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726822AbeINJjw (ORCPT ); Fri, 14 Sep 2018 05:39:52 -0400 Received: from cmccmta2.chinamobile.com ([221.176.66.80]:22700 "EHLO cmccmta2.chinamobile.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725953AbeINJjw (ORCPT ); Fri, 14 Sep 2018 05:39:52 -0400 Received: from spf.mail.chinamobile.com (unknown[172.16.121.3]) by rmmx-syy-dmz-app07-12007 (RichMail) with SMTP id 2ee75b9b389a7f5-be8e2; Fri, 14 Sep 2018 12:27:07 +0800 (CST) X-RM-TRANSID: 2ee75b9b389a7f5-be8e2 X-RM-TagInfo: emlType=0 X-RM-SPAM-FLAG: 00000000 Received: from localhost (unknown[223.105.0.240]) by rmsmtp-syy-appsvr02-12002 (RichMail) with SMTP id 2ee25b9b38995c9-e03d9; Fri, 14 Sep 2018 12:27:07 +0800 (CST) X-RM-TRANSID: 2ee25b9b38995c9-e03d9 From: Haishuang Yan To: "David S. Miller" , Alexey Kuznetsov Cc: Jiri Benc , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Haishuang Yan Subject: [PATCH v3, net-next 2/2] ip6_gre: simplify gre header parsing in ip6gre_err Date: Fri, 14 Sep 2018 12:26:48 +0800 Message-Id: <1536899208-2958-2-git-send-email-yanhaishuang@cmss.chinamobile.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1536899208-2958-1-git-send-email-yanhaishuang@cmss.chinamobile.com> References: <1536899208-2958-1-git-send-email-yanhaishuang@cmss.chinamobile.com> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Same as ip_gre, use gre_parse_header to parse gre header in gre error handler code. Signed-off-by: Haishuang Yan --- net/ipv6/ip6_gre.c | 26 ++++---------------------- 1 file changed, 4 insertions(+), 22 deletions(-) diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c index e493b04..515adbd 100644 --- a/net/ipv6/ip6_gre.c +++ b/net/ipv6/ip6_gre.c @@ -427,35 +427,17 @@ static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt, u8 type, u8 code, int offset, __be32 info) { struct net *net = dev_net(skb->dev); - const struct gre_base_hdr *greh; const struct ipv6hdr *ipv6h; - int grehlen = sizeof(*greh); + struct tnl_ptk_info tpi; struct ip6_tnl *t; - int key_off = 0; - __be16 flags; - __be32 key; - if (!pskb_may_pull(skb, offset + grehlen)) - return; - greh = (const struct gre_base_hdr *)(skb->data + offset); - flags = greh->flags; - if (flags & (GRE_VERSION | GRE_ROUTING)) + if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6), + offset) < 0) return; - if (flags & GRE_CSUM) - grehlen += 4; - if (flags & GRE_KEY) { - key_off = grehlen + offset; - grehlen += 4; - } - if (!pskb_may_pull(skb, offset + grehlen)) - return; ipv6h = (const struct ipv6hdr *)skb->data; - greh = (const struct gre_base_hdr *)(skb->data + offset); - key = key_off ? *(__be32 *)(skb->data + key_off) : 0; - t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr, - key, greh->protocol); + tpi.key, tpi.proto); if (!t) return;