vxlan: Only bind to sockets with compatible flags enabled
A VXLAN net_device looking for an appropriate socket may only consider
a socket which has a matching set of flags/extensions enabled. If
incompatible flags are enabled, return a conflict to have the caller
create a distinct socket with distinct port.
The OVS VXLAN port is kept unaware of extensions at this point.
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/vxlan.h b/include/net/vxlan.h
index f4a3583..7be8c34 100644
--- a/include/net/vxlan.h
+++ b/include/net/vxlan.h
@@ -129,6 +129,9 @@
#define VXLAN_F_REMCSUM_RX 0x400
#define VXLAN_F_GBP 0x800
+/* These flags must match in order for a socket to be shareable */
+#define VXLAN_F_UNSHAREABLE VXLAN_F_GBP
+
struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
vxlan_rcv_t *rcv, void *data,
bool no_share, u32 flags);