linux-kernel - [ 029/135] vxlan: Avoid creating fdb entry with NULL destination

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Date:	Fri, 11 Oct 2013 12:38:30 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Sridhar Samudrala <sri@...ibm.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 029/135] vxlan: Avoid creating fdb entry with NULL destination

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

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

From: Sridhar Samudrala <sri@...ibm.com>

[ Upstream commit 2936b6ab455433a5ad14c7a1d2473afe1fa3faa7 ]

Commit afbd8bae9c798c5cdbe4439d3a50536b5438247c
   vxlan: add implicit fdb entry for default destination
creates an implicit fdb entry for default destination. This results
in an invalid fdb entry if default destination is not specified.
For ex:
  ip link add vxlan1 type vxlan id 100
creates the following fdb entry
  00:00:00:00:00:00 dev vxlan1 dst 0.0.0.0 self permanent

This patch fixes this issue by creating an fdb entry only if a
valid default destination is specified.

Signed-off-by: Sridhar Samudrala <sri@...ibm.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/vxlan.c |   20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1767,15 +1767,17 @@ static int vxlan_newlink(struct net *net
 
 	SET_ETHTOOL_OPS(dev, &vxlan_ethtool_ops);
 
-	/* create an fdb entry for default destination */
-	err = vxlan_fdb_create(vxlan, all_zeros_mac,
-			       vxlan->default_dst.remote_ip,
-			       NUD_REACHABLE|NUD_PERMANENT,
-			       NLM_F_EXCL|NLM_F_CREATE,
-			       vxlan->dst_port, vxlan->default_dst.remote_vni,
-			       vxlan->default_dst.remote_ifindex, NTF_SELF);
-	if (err)
-		return err;
+	/* create an fdb entry for a valid default destination */
+	if (vxlan->default_dst.remote_ip != htonl(INADDR_ANY)) {
+		err = vxlan_fdb_create(vxlan, all_zeros_mac,
+				       vxlan->default_dst.remote_ip,
+				       NUD_REACHABLE|NUD_PERMANENT,
+				       NLM_F_EXCL|NLM_F_CREATE,
+				       vxlan->dst_port, vxlan->default_dst.remote_vni,
+				       vxlan->default_dst.remote_ifindex, NTF_SELF);
+		if (err)
+			return err;
+	}
 
 	err = register_netdevice(dev);
 	if (err) {


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