netdev - [PATCH net-next 3/4 RFC] pktgen: Fixing UPD checksum calculation

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Date:	Wed, 30 Jul 2014 17:20:11 +0100
From:	Zoltan Kiss <zoltan.kiss@...rix.com>
To:	Steffen Klassert <steffen.klassert@...unet.com>,
	Mathias Krause <minipli@...glemail.com>,
	Daniel Borkmann <dborkman@...hat.com>
CC:	Zoltan Kiss <zoltan.kiss@...rix.com>,
	"David S. Miller" <davem@...emloft.net>,
	Thomas Graf <tgraf@...g.ch>, Joe Perches <joe@...ches.com>,
	<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<xen-devel@...ts.xenproject.org>
Subject: [PATCH net-next 3/4 RFC] pktgen: Fixing UPD checksum calculation

It passes port number instead of IP address for checksuming. The udp4_hwcsum()
call is also bad, but my next patch will get rid of it anyway. The IPv6 code
does it correctly already. It also changes replaces 8 with sizeof(struct udphdr) 

Signed-off-by: Zoltan Kiss <zoltan.kiss@...rix.com>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Thomas Graf <tgraf@...g.ch>
Cc: Joe Perches <joe@...ches.com>
Cc: netdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Cc: xen-devel@...ts.xenproject.org
---
diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index ba61e2b..d8905cd 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -3061,8 +3061,9 @@ static struct sk_buff *fill_packet_ipv4(struct net_device *odev,
 		__wsum csum = udp_csum(skb);
 
 		/* add protocol-dependent pseudo-header */
-		udph->check = csum_tcpudp_magic(udph->source, udph->dest,
-						datalen + 8, IPPROTO_UDP, csum);
+		udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
+						datalen + sizeof(struct udphdr),
+						IPPROTO_UDP, csum);
 
 		if (udph->check == 0)
 			udph->check = CSUM_MANGLED_0;
--
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