netdev - [PATCH ipsec 1/2] xfrm: revert ipv4 mtu determination to dst

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Message-ID: <20130822195355.GA4784@order.stressinduktion.org>
Date:	Thu, 22 Aug 2013 21:53:56 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Steffen Klassert <steffen.klassert@...unet.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: [PATCH ipsec 1/2] xfrm: revert ipv4 mtu determination to dst_mtu

In commit 0ea9d5e3e0e03a63b11392f5613378977dae7eca ("xfrm: introduce
helper for safe determination of mtu") I switched the determination of
ipv4 mtus from dst_mtu to ip_skb_dst_mtu. This was an error because in
case of IP_PMTUDISC_PROBE we fall back to the interface mtu, which is
never correct for ipv4 ipsec.

Cc: Steffen Klassert <steffen.klassert@...unet.com>
Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
---
 include/net/xfrm.h | 2 --
 1 file changed, 2 deletions(-)

diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index ac5b025..65d3529 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -1730,8 +1730,6 @@ static inline int xfrm_skb_dst_mtu(struct sk_buff *skb)
 
 	if (sk && skb->protocol == htons(ETH_P_IPV6))
 		return ip6_skb_dst_mtu(skb);
-	else if (sk && skb->protocol == htons(ETH_P_IP))
-		return ip_skb_dst_mtu(skb);
 	return dst_mtu(skb_dst(skb));
 }
 
-- 
1.8.3.1

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