net: replace net_client_init1() netdev whitelist with blacklist

It's cumbersome to keep the whitelist up-to-date.  New netdev backends
should most likely be allowed so a blacklist makes more sense than a
whitelist.
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: NThomas Huth <thuth@redhat.com>
Message-id: 1432743412-15943-3-git-send-email-stefanha@redhat.com

net/net.c

@@ -925,31 +925,9 @@ static int net_client_init1(const void *object, int is_netdev, Error **errp)
         opts = u.netdev->opts;
         name = u.netdev->id;
 
-        switch (opts->kind) {
-#ifdef CONFIG_SLIRP
-        case NET_CLIENT_OPTIONS_KIND_USER:
-#endif
-        case NET_CLIENT_OPTIONS_KIND_TAP:
-        case NET_CLIENT_OPTIONS_KIND_SOCKET:
-#ifdef CONFIG_VDE
-        case NET_CLIENT_OPTIONS_KIND_VDE:
-#endif
-#ifdef CONFIG_NETMAP
-        case NET_CLIENT_OPTIONS_KIND_NETMAP:
-#endif
-#ifdef CONFIG_NET_BRIDGE
-        case NET_CLIENT_OPTIONS_KIND_BRIDGE:
-#endif
-        case NET_CLIENT_OPTIONS_KIND_HUBPORT:
-#ifdef CONFIG_VHOST_NET_USED
-        case NET_CLIENT_OPTIONS_KIND_VHOST_USER:
-#endif
-#ifdef CONFIG_L2TPV3
-        case NET_CLIENT_OPTIONS_KIND_L2TPV3:
-#endif
-            break;
-
-        default:
+        if (opts->kind == NET_CLIENT_OPTIONS_KIND_DUMP ||
+            opts->kind == NET_CLIENT_OPTIONS_KIND_NIC ||
+            !net_client_init_fun[opts->kind]) {
             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
                        "a netdev backend type");
             return -1;