netdev - [net PATCH 1/2] ip6_udp_tunnel: Fix checksum calculation

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Message-ID: <20141125040831.13612.4374.stgit@ahduyck-workstation.home>
Date:	Mon, 24 Nov 2014 20:08:32 -0800
From:	alexander.duyck@...il.com
To:	netdev@...r.kernel.org
Cc:	Alexander Duyck <alexander.h.duyck@...hat.com>,
	Andy Zhou <azhou@...ira.com>, davem@...emloft.net
Subject: [net PATCH 1/2] ip6_udp_tunnel: Fix checksum calculation

From: Alexander Duyck <alexander.h.duyck@...hat.com>

The UDP checksum calculation for VXLAN tunnels is currently using the
socket addresses instead of the actual packet source and destination
addresses.  As a result the checksum calculated is incorrect in some
cases.

Also uh->check was being set twice, first it was set to 0, and then it is
set again in udp6_set_csum.  This change removes the redundant assignment
to 0.

Fixes: acbf74a7 ("vxlan: Refactor vxlan driver to make use of the common UDP tunnel functions.")

Cc: Andy Zhou <azhou@...ira.com>
Signed-off-by: Alexander Duyck <alexander.h.duyck@...hat.com>
---
 net/ipv6/ip6_udp_tunnel.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/net/ipv6/ip6_udp_tunnel.c b/net/ipv6/ip6_udp_tunnel.c
index b04ed72..8db6c98 100644
--- a/net/ipv6/ip6_udp_tunnel.c
+++ b/net/ipv6/ip6_udp_tunnel.c
@@ -79,15 +79,13 @@ int udp_tunnel6_xmit_skb(struct socket *sock, struct dst_entry *dst,
 	uh->source = src_port;
 
 	uh->len = htons(skb->len);
-	uh->check = 0;
 
 	memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
 	IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED
 			    | IPSKB_REROUTED);
 	skb_dst_set(skb, dst);
 
-	udp6_set_csum(udp_get_no_check6_tx(sk), skb, &inet6_sk(sk)->saddr,
-		      &sk->sk_v6_daddr, skb->len);
+	udp6_set_csum(udp_get_no_check6_tx(sk), skb, saddr, daddr, skb->len);
 
 	__skb_push(skb, sizeof(*ip6h));
 	skb_reset_network_header(skb);

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