path: root/drivers/net/vxlan.c
diff options
authorPetr Machata <petrm@mellanox.com>2018-12-18 13:16:02 +0000
committerDavid S. Miller <davem@davemloft.net>2018-12-18 21:18:26 -0800
commitce5e098f7a10b4bf8e948c12fa350320c5c3afad (patch)
treea6dab470bdf3f2d7bc46f6d2e8ebbcbc8e274fc6 /drivers/net/vxlan.c
parentvxlan: Fix error path in __vxlan_dev_create() (diff)
vxlan: changelink: Fix handling of default remotes
Default remotes are stored as FDB entries with an Ethernet address of 00:00:00:00:00:00. When a request is made to change a remote address of a VXLAN device, vxlan_changelink() first deletes the existing default remote, and then creates a new FDB entry. This works well as long as the list of default remotes matches exactly the configuration of a VXLAN remote address. Thus when the VXLAN device has a remote of X, there should be exactly one default remote FDB entry X. If the VXLAN device has no remote address, there should be no such entry. Besides using "ip link set", it is possible to manipulate the list of default remotes by using the "bridge fdb". It is therefore easy to break the above condition. Under such circumstances, the __vxlan_fdb_delete() call doesn't delete the FDB entry itself, but just one remote. The following vxlan_fdb_create() then creates a new FDB entry, leading to a situation where two entries exist for the address 00:00:00:00:00:00, each with a different subset of default remotes. An even more obvious breakage rooted in the same cause can be observed when a remote address is configured for a VXLAN device that did not have one before. In that case vxlan_changelink() doesn't remove any remote, and just creates a new FDB entry for the new address: $ ip link add name vx up type vxlan id 2000 dstport 4789 $ bridge fdb ap dev vx 00:00:00:00:00:00 dst self permanent $ bridge fdb ap dev vx 00:00:00:00:00:00 dst self permanent $ ip link set dev vx type vxlan remote $ bridge fdb sh dev vx | grep 00:00:00:00:00:00 00:00:00:00:00:00 dst self permanent <- new entry, 1 rdst 00:00:00:00:00:00 dst self permanent <- orig. entry, 2 rdsts 00:00:00:00:00:00 dst self permanent To fix this, instead of calling vxlan_fdb_create() directly, defer to vxlan_fdb_update(). That has logic to handle the duplicates properly. Additionally, it also handles notifications, so drop that call from changelink as well. Fixes: 0241b836732f ("vxlan: fix default fdb entry netlink notify ordering during netdev create") Signed-off-by: Petr Machata <petrm@mellanox.com> Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/vxlan.c')
1 files changed, 3 insertions, 4 deletions
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 82e78d6fd9ae..0565f8880199 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -3542,7 +3542,6 @@ static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
struct vxlan_rdst *dst = &vxlan->default_dst;
struct vxlan_rdst old_dst;
struct vxlan_config conf;
- struct vxlan_fdb *f = NULL;
int err;
err = vxlan_nl2conf(tb, data,
@@ -3568,19 +3567,19 @@ static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
old_dst.remote_ifindex, 0);
if (!vxlan_addr_any(&dst->remote_ip)) {
- err = vxlan_fdb_create(vxlan, all_zeros_mac,
+ err = vxlan_fdb_update(vxlan, all_zeros_mac,
- NTF_SELF, &f);
if (err) {
return err;
- vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH);