linux-kernel - [PATCH 4.11 10/28] geneve: fix incorrect setting of UDP checksum flag

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Date:   Thu, 11 May 2017 16:12:27 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Girish Moodalbail <girish.moodalbail@...cle.com>,
        Pravin B Shelar <pshelar@....org>,
        Lance Richardson <lrichard@...hat.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.11 10/28] geneve: fix incorrect setting of UDP checksum flag

4.11-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Girish Moodalbail <girish.moodalbail@...cle.com>


[ Upstream commit 5e0740c445e6ae4026f5e52456ff8d0be9725183 ]

Creating a geneve link with 'udpcsum' set results in a creation of link
for which UDP checksum will NOT be computed on outbound packets, as can
be seen below.

11: gen0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN
    link/ether c2:85:27:b6:b4:15 brd ff:ff:ff:ff:ff:ff promiscuity 0
    geneve id 200 remote 192.168.13.1 dstport 6081 noudpcsum

Similarly, creating a link with 'noudpcsum' set results in a creation
of link for which UDP checksum will be computed on outbound packets.

Fixes: 9b4437a5b870 ("geneve: Unify LWT and netdev handling.")
Signed-off-by: Girish Moodalbail <girish.moodalbail@...cle.com>
Acked-by: Pravin B Shelar <pshelar@....org>
Acked-by: Lance Richardson <lrichard@...hat.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/geneve.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -1244,7 +1244,7 @@ static int geneve_newlink(struct net *ne
 		metadata = true;
 
 	if (data[IFLA_GENEVE_UDP_CSUM] &&
-	    !nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
+	    nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
 		info.key.tun_flags |= TUNNEL_CSUM;
 
 	if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX] &&