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

[Zoltan Kiss <zoltan.kiss@xxxxxxxxxx>]

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@xxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Thomas Graf <tgraf@xxxxxxx>
Cc: Joe Perches <joe@xxxxxxxxxxx>
Cc: netdev@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx
---
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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