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Date:	Mon, 4 Aug 2014 14:37:13 +0100
From:	Zoltan Kiss <>
To:	Steffen Klassert <>,
	Mathias Krause <>,
	Daniel Borkmann <>
CC:	Zoltan Kiss <>,
	"David S. Miller" <>,
	Thomas Graf <>, Joe Perches <>,
	<>, <>,
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 <>
Cc: "David S. Miller" <>
Cc: Thomas Graf <>
Cc: Joe Perches <>
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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