@@ -407,6 +407,26 @@ static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
return NULL;
}
+/* Replace destination of unicast mac */
+static int vxlan_fdb_replace(struct vxlan_fdb *f,
+ __be32 ip, __be16 port, __u32 vni, __u32 ifindex)
+{
+ struct vxlan_rdst *rd;
+
+ rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
+ if (rd)
+ return 0;
+
+ rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
+ if (!rd)
+ return 0;
+ rd->remote_ip = ip;
+ rd->remote_port = port;
+ rd->remote_vni = vni;
+ rd->remote_ifindex = ifindex;
+ return 1;
+}
+
/* Add/update destinations for multicast */
static int vxlan_fdb_append(struct vxlan_fdb *f,
__be32 ip, __be16 port, __u32 vni, __u32 ifindex)
@@ -457,6 +477,19 @@ static int vxlan_fdb_create(struct vxlan_dev *vxlan,
f->updated = jiffies;
notify = 1;
}
+ if ((flags & NLM_F_REPLACE)) {
+ /* Only change unicasts */
+ if (!(is_multicast_ether_addr(f->eth_addr) ||
+ is_zero_ether_addr(f->eth_addr))) {
+ int rc = vxlan_fdb_replace(f, ip, port, vni,
+ ifindex);
+
+ if (rc < 0)
+ return rc;
+ notify |= rc;
+ } else
+ return -EOPNOTSUPP;
+ }
if ((flags & NLM_F_APPEND) &&
(is_multicast_ether_addr(f->eth_addr) ||
is_zero_ether_addr(f->eth_addr))) {
@@ -473,6 +506,11 @@ static int vxlan_fdb_create(struct vxlan_dev *vxlan,
if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
return -ENOSPC;
+ /* Disallow replace to add a multicast entry */
+ if ((flags & NLM_F_REPLACE) &&
+ (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
+ return -EOPNOTSUPP;
+
netdev_dbg(vxlan->dev, "add %pM -> %pI4\n", mac, &ip);
f = kmalloc(sizeof(*f), GFP_ATOMIC);
if (!f)
Add support to replace an existing entry found in the vxlan fdb database. The entry in question is identified by its unicast mac address and the destination information is changed. If the entry is not found, it is added in the forwarding database. This is similar to changing an entry in the neighbour table. Multicast mac addresses can not be changed with the replace option. This is useful for virtual machine migration when the destination of a target virtual machine changes. The replace feature can be used instead of delete followed by add. Signed-off-by: Thomas Richter <tmricht@linux.vnet.ibm.com> --- drivers/net/vxlan.c | 40 +++++++++++++++++++++++++++++++++++++++- 1 file changed, 39 insertions(+), 1 deletion(-)