Patch "geneve: fix max_mtu setting" has been added to the 4.6-stable tree

Patch "geneve: fix max_mtu setting" has been added to the 4.6-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    geneve: fix max_mtu setting

to the 4.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     geneve-fix-max_mtu-setting.patch
and it can be found in the queue-4.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Thu Jul 14 07:36:41 JST 2016
From: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
Date: Sat, 2 Jul 2016 15:02:48 +0800
Subject: geneve: fix max_mtu setting

From: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>

[ Upstream commit d5d5e8d55732c7c35c354e45e3b0af2795978a57 ]

For ipv6+udp+geneve encapsulation data, the max_mtu should subtract
sizeof(ipv6hdr), instead of sizeof(iphdr).

Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/geneve.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -1092,12 +1092,17 @@ static netdev_tx_t geneve_xmit(struct sk
 
 static int __geneve_change_mtu(struct net_device *dev, int new_mtu, bool strict)
 {
+	struct geneve_dev *geneve = netdev_priv(dev);
 	/* The max_mtu calculation does not take account of GENEVE
 	 * options, to avoid excluding potentially valid
 	 * configurations.
 	 */
-	int max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - sizeof(struct iphdr)
-		- dev->hard_header_len;
+	int max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
+
+	if (geneve->remote.sa.sa_family == AF_INET6)
+		max_mtu -= sizeof(struct ipv6hdr);
+	else
+		max_mtu -= sizeof(struct iphdr);
 
 	if (new_mtu < 68)
 		return -EINVAL;


Patches currently in stable-queue which might be from yanhaishuang@cmss.chinamobile.com are

queue-4.6/geneve-fix-max_mtu-setting.patch