From: Chris Lalancette <clalance@redhat.com>
Date: Tue, 7 Nov 2006 22:56:19 +0000 (-0800)
Subject: [NETPOLL]: Compute checksum properly in netpoll_send_udp().
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=8e365eec04c86899fab5db0f49a9c98554069bd0;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

[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>
---

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));