netdev - [IPVS]: Use skb_forward

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Message-ID: <20070726085939.GA442@gondor.apana.org.au>
Date:	Thu, 26 Jul 2007 16:59:39 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Cc:	Simon Horman <horms@...ge.net.au>
Subject: [IPVS]: Use skb_forward_csum

Hi Dave:

Found this while looking at 8797.  Although it's not clear
that this is the cause yet (it could only happen if a
seemingly remote TCP stream is DNATed to a local address),
we need this patch anyway to avoid clobbering incoming
traffic with CHECKSUM_PARTIAL in its ip_summed field.

[IPVS]: Use skb_forward_csum

As a path that forwards packets, IPVS should be using
skb_forward_csum instead of directly setting ip_summed
to CHECKSUM_NONE.

Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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--
diff --git a/net/ipv4/ipvs/ip_vs_xmit.c b/net/ipv4/ipvs/ip_vs_xmit.c
index 900ce29..666e080 100644
--- a/net/ipv4/ipvs/ip_vs_xmit.c
+++ b/net/ipv4/ipvs/ip_vs_xmit.c
@@ -128,7 +128,7 @@ ip_vs_dst_reset(struct ip_vs_dest *dest)
 #define IP_VS_XMIT(skb, rt)				\
 do {							\
 	(skb)->ipvs_property = 1;			\
-	(skb)->ip_summed = CHECKSUM_NONE;		\
+	skb_forward_csum(skb);				\
 	NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, (skb), NULL,	\
 		(rt)->u.dst.dev, dst_output);		\
 } while (0)
-
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