Merge "only disable mac ageing for ovs hybrid plug"
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d29c6e7765
@ -39,7 +39,7 @@ class IpCommand(object):
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@abc.abstractmethod
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def add(self, device, dev_type, check_exit_code=None, peer=None, link=None,
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vlan_id=None):
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vlan_id=None, ageing=None):
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"""Method to add an interface.
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:param device: A network device (string)
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@ -50,6 +50,8 @@ class IpCommand(object):
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:param link: String root network interface name, 'device' will be a
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VLAN tagged virtual interface
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:param vlan_id: Integer VLAN ID for VLAN devices
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:param ageing: integer value in seconds before learned
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mac addresses are forgotten.
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:return: status of the command execution
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"""
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@ -67,7 +67,7 @@ class PyRoute2(ip_command.IpCommand):
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return self._ip_link(ip, 'set', check_exit_code, **args)
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def add(self, device, dev_type, check_exit_code=None, peer=None, link=None,
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vlan_id=None):
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vlan_id=None, ageing=None):
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check_exit_code = check_exit_code or []
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with iproute.IPRoute() as ip:
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args = {'ifname': device,
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@ -86,10 +86,18 @@ class PyRoute2(ip_command.IpCommand):
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# in the bridge_data class located in the
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# pyroute2.netlink.rtnl.ifinfmsg module for mode details
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# https://github.com/svinota/pyroute2/blob/3ba9cdde34b2346ef8c2f8ba17cef5dbeb4c6d52/pyroute2/netlink/rtnl/ifinfmsg/__init__.py#L776-L820
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args['IFLA_BR_AGEING_TIME'] = 0 # disable mac learning ageing
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args['IFLA_BR_FORWARD_DELAY'] = 0 # set no delay
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args['IFLA_BR_STP_STATE'] = 0 # disable spanning tree
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args['IFLA_BR_MCAST_SNOOPING'] = 0 # disable snooping
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# NOTE(sean-k-mooney): we conditionally enable mac ageing as
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# this code is shared between the ovs and linux bridge
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# plugins. For linux bridge we want to allow the default
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# ageing of 300 seconds, whereas for ovs with the ip-tables
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# firewall we want to disable ageing. None was chosen as
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# the default value of ageing to allow the caller to determine
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# what policy to use and keep this code generic.
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if ageing is not None:
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args['IFLA_BR_AGEING_TIME'] = ageing
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else:
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raise exception.NetworkInterfaceTypeNotDefined(type=dev_type)
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@ -213,6 +213,28 @@ class TestIpCommand(ShellIpCommands, base.BaseFunctionalTestCase):
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_ip_cmd_add(device, 'bridge')
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self.assertTrue(self.exist_device(device))
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base_path = "/sys/class/net/test_dev_11/bridge/%s"
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with open(base_path % "forward_delay", "r") as f:
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self.assertEqual("0", f.readline().rstrip('\n'))
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with open(base_path % "stp_state", "r") as f:
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self.assertEqual("0", f.readline().rstrip('\n'))
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with open(base_path % "multicast_snooping", "r") as f:
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self.assertEqual("0", f.readline().rstrip('\n'))
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with open(base_path % "ageing_time", "r") as f:
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value = int(f.readline().rstrip('\n'))
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# NOTE(sean-k-mooney): IEEE 8021-Q recommends that the default
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# ageing should be 300 and the linux kernel defaults to 300
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# via an unconditional define. As such we expect this to be
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# 300 however since services like network-manager could change
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# the default on bridge creation we check that if it is not 300
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# then the value should not be 0.
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self.assertTrue(300 == value or value != 0)
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def test_add_bridge_with_mac_ageing_0(self):
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device = "test_dev_12"
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self.addCleanup(self.del_device, device)
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_ip_cmd_add(device, 'bridge', ageing=0)
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self.assertTrue(self.exist_device(device))
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base_path = "/sys/class/net/test_dev_12/bridge/%s"
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with open(base_path % "forward_delay", "r") as f:
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self.assertEqual("0", f.readline().rstrip('\n'))
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with open(base_path % "stp_state", "r") as f:
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@ -223,8 +245,8 @@ class TestIpCommand(ShellIpCommands, base.BaseFunctionalTestCase):
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self.assertEqual("0", f.readline().rstrip('\n'))
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def test_add_port_to_bridge(self):
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device = "test_dev_12"
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bridge = "test_dev_13"
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device = "test_dev_13"
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bridge = "test_dev_14"
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self.addCleanup(self.del_device, device)
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self.addCleanup(self.del_device, bridge)
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self.add_device(device, 'dummy')
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@ -95,6 +95,15 @@ class TestIpCommand(base.TestCase):
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def test_add_bridge(self):
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self.ip.add(self.DEVICE, self.TYPE_BRIDGE)
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args = {'ifname': self.DEVICE,
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'kind': self.TYPE_BRIDGE,
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'IFLA_BR_FORWARD_DELAY': 0,
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'IFLA_BR_STP_STATE': 0,
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'IFLA_BR_MCAST_SNOOPING': 0}
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self.ip_link.assert_called_once_with('add', **args)
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def test_add_bridge_with_ageing(self):
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self.ip.add(self.DEVICE, self.TYPE_BRIDGE, ageing=0)
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args = {'ifname': self.DEVICE,
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'kind': self.TYPE_BRIDGE,
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'IFLA_BR_AGEING_TIME': 0,
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@ -0,0 +1,13 @@
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---
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fixes:
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- |
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As part of a `bug #1715317`_, MAC ageing was disabled for the intermediate
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bridge created as part of the hybrid plug mechanism. During the removal
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of ``brctl``, this behavior was inadvertently applied to all linux bridges
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created by os-vif including those used in the linuxbridge driver.
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As a result this can lead to packet flooding (see bug #1837252) when
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instances are migrated. This behavior has been reverted so that the
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default mac ageing is determined by the kernel and is not set when using
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the os-vif linux bridge plugin.
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.. _bug #1715317: https://bugs.launchpad.net/os-vif/+bug/1837252
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@ -129,7 +129,10 @@ def _arp_filtering(bridge):
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@privsep.vif_plug.entrypoint
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def ensure_bridge(bridge):
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if not ip_lib.exists(bridge):
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ip_lib.add(bridge, 'bridge')
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# NOTE(sean-k-mooney): we set mac ageing to 0 to disable mac ageing
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# on the hybrid plug bridge to avoid packet loss during live
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# migration. This avoids bug #1715317 and related bug #1414559
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ip_lib.add(bridge, 'bridge', ageing=0)
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_disable_ipv6(bridge)
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_arp_filtering(bridge)
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# we bring up the bridge to allow it to switch packets
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@ -41,7 +41,7 @@ class LinuxNetTest(testtools.TestCase):
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linux_net.ensure_bridge("br0")
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mock_dev_exists.assert_called_once_with("br0")
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mock_add.assert_called_once_with("br0", "bridge")
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mock_add.assert_called_once_with("br0", "bridge", ageing=0)
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mock_disable_ipv6.assert_called_once_with("br0")
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mock_set_state.assert_called_once_with("br0", "up")
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mock_arp_filtering.assert_called_once_with("br0")
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