[NETPOLL]: Compute checksum properly in netpoll_send_udp().

Signed-off-by: Chris Lalancette <clalance@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index 9308af060b44..6589adb14cbf 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -340,6 +340,12 @@ void netpoll_send_udp(struct netpoll *np, const char *msg, int len)
         udph->dest = htons(np->remote_port);
         udph->len = htons(udp_len);
         udph->check = 0;
+        udph->check = csum_tcpudp_magic(htonl(np->local_ip),
+                                        htonl(np->remote_ip),
+                                        udp_len, IPPROTO_UDP,
+                                        csum_partial((unsigned char *)udph, udp_len, 0));
+        if (udph->check == 0)
+                udph->check = -1;
 
         skb->nh.iph = iph = (struct iphdr *)skb_push(skb, sizeof(*iph));