[libvirt] [PATCHv3 6/9] network: setup bridge devices for macTableManager='libvirt'

[Laine Stump]

When the bridge device for a network has macTableManager='libvirt' the
intent is that all kernel management of the bridge's MAC table
(Forwarding Database, or fdb, in the case of a Linux Host Bridge) be
disabled, with libvirt handling updates to the table instead. The
setup required for the bridge itself is:

1) set the "vlan_filtering" property of the bridge device to 1.

2) If the bridge has a "Dummy" tap device used to set a fixed MAC
address on the bridge (which is always the case for a bridge created
by libvirt, and never the case for a bridge created by the host system
network config), turn off learning and unicast_flood on this tap (this
is needed even though this tap is never IFF_UP, because the kernel
ignores the IFF_UP flag of devices when using their settings to
automatically decide whether or not to turn off promiscuous mode for
any attached device).

(1) is done both for libvirt-created/managed bridges, and for bridges
that are created by the host system config, while (2) is done only for
bridges created by libvirt (i.e. for forward modes of nat, routed, and
isolated bridges)

There is no attempt to turn vlan_filtering off when destroying the
network because in the case of a libvirt-created bridge, the bridge is
about to be destroyed anyway, and in the case of a system bridge, if
the other devices attached to the bridge could operate properly before
destroying libvirt's network object, they will continue to operate
properly (this is similar to the way that libvirt will enable
ip_forwarding whenever a routed/natted network is started, but will
never attempt to disable it if they are stopped).
---
Change from V2: attribute name.

 src/network/bridge_driver.c | 54 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

diff --git a/src/network/bridge_driver.c b/src/network/bridge_driver.c
index 93d36ab..29222d0 100644
--- a/src/network/bridge_driver.c
+++ b/src/network/bridge_driver.c
@@ -1906,6 +1906,29 @@ networkAddAddrToBridge(virNetworkObjPtr network,
     return 0;
 }
 
+
+static int
+networkStartHandleMACTableManagerMode(virNetworkObjPtr network,
+                                      const char *macTapIfName)
+{
+    const char *brname = network->def->bridge;
+
+    if (brname &&
+        network->def->macTableManager
+        == VIR_NETWORK_BRIDGE_MAC_TABLE_MANAGER_LIBVIRT) {
+        if (virNetDevBridgeSetVlanFiltering(brname, true) < 0)
+            return -1;
+        if (macTapIfName) {
+            if (virNetDevBridgePortSetLearning(brname, macTapIfName, false) < 0)
+                return -1;
+            if (virNetDevBridgePortSetUnicastFlood(brname, macTapIfName, false) < 0)
+                return -1;
+        }
+    }
+    return 0;
+}
+
+
 /* add an IP (static) route to a bridge */
 static int
 networkAddRouteToBridge(virNetworkObjPtr network,
@@ -2032,6 +2055,9 @@ networkStartNetworkVirtual(virNetworkObjPtr network)
             goto err2;
     }
 
+    if (networkStartHandleMACTableManagerMode(network, macTapIfName) < 0)
+        goto err2;
+
     /* Bring up the bridge interface */
     if (virNetDevSetOnline(network->def->bridge, 1) < 0)
         goto err2;
@@ -2176,6 +2202,27 @@ static int networkShutdownNetworkVirtual(virNetworkObjPtr network)
 }
 
 
+static int
+networkStartNetworkBridge(virNetworkObjPtr network)
+{
+    /* put anything here that needs to be done each time a network of
+     * type BRIDGE, is started. On failure, undo anything you've done,
+     * and return -1. On success return 0.
+     */
+    return networkStartHandleMACTableManagerMode(network, NULL);
+}
+
+static int
+networkShutdownNetworkBridge(virNetworkObjPtr network ATTRIBUTE_UNUSED)
+{
+    /* put anything here that needs to be done each time a network of
+     * type BRIDGE is shutdown. On failure, undo anything you've done,
+     * and return -1. On success return 0.
+     */
+    return 0;
+}
+
+
 /* networkCreateInterfacePool:
  * @netdef: the original NetDef from the network
  *
@@ -2339,6 +2386,10 @@ networkStartNetwork(virNetworkObjPtr network)
         break;
 
     case VIR_NETWORK_FORWARD_BRIDGE:
+       if (networkStartNetworkBridge(network) < 0)
+          goto cleanup;
+       break;
+
     case VIR_NETWORK_FORWARD_PRIVATE:
     case VIR_NETWORK_FORWARD_VEPA:
     case VIR_NETWORK_FORWARD_PASSTHROUGH:
@@ -2405,6 +2456,9 @@ static int networkShutdownNetwork(virNetworkObjPtr network)
         break;
 
     case VIR_NETWORK_FORWARD_BRIDGE:
+        ret = networkShutdownNetworkBridge(network);
+        break;
+
     case VIR_NETWORK_FORWARD_PRIVATE:
     case VIR_NETWORK_FORWARD_VEPA:
     case VIR_NETWORK_FORWARD_PASSTHROUGH:
-- 
1.9.3