From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tom Herbert Subject: [PATCH v2 net-next 1/4] ip_tunnel: Account for secondary encapsulation header in max_headroom Date: Fri, 3 Oct 2014 15:48:07 -0700 Message-ID: <1412376490-8774-2-git-send-email-therbert@google.com> References: <1412376490-8774-1-git-send-email-therbert@google.com> To: davem@davemloft.net, netdev@vger.kernel.org Return-path: Received: from mail-pa0-f48.google.com ([209.85.220.48]:36259 "EHLO mail-pa0-f48.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755090AbaJCWsl (ORCPT ); Fri, 3 Oct 2014 18:48:41 -0400 Received: by mail-pa0-f48.google.com with SMTP id eu11so2203503pac.21 for ; Fri, 03 Oct 2014 15:48:40 -0700 (PDT) In-Reply-To: <1412376490-8774-1-git-send-email-therbert@google.com> Sender: netdev-owner@vger.kernel.org List-ID: When adjusting max_header for the tunnel interface based on egress device we need to account for any extra bytes in secondary encapsulation (e.g. FOU). Signed-off-by: Tom Herbert --- net/ipv4/ip_tunnel.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c index b75b47b..54ace25 100644 --- a/net/ipv4/ip_tunnel.c +++ b/net/ipv4/ip_tunnel.c @@ -759,7 +759,7 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, df |= (inner_iph->frag_off&htons(IP_DF)); max_headroom = LL_RESERVED_SPACE(rt->dst.dev) + sizeof(struct iphdr) - + rt->dst.header_len; + + rt->dst.header_len + ip_encap_hlen(&tunnel->encap); if (max_headroom > dev->needed_headroom) dev->needed_headroom = max_headroom; -- 2.1.0.rc2.206.gedb03e5