From 6da1543f492bf50260cbcf99075b87a7b9e34281 Mon Sep 17 00:00:00 2001 From: Slawek Kaplonski Date: Tue, 16 Feb 2021 11:19:44 +0100 Subject: [PATCH] [OVS FW] Clean conntrack entries with mark == CT_MARK_INVALID In case when security group is removed from port, connections established to/from port which were hitting some of the removed SG rules will be marked with CT_MARK_INVALID in the conntrack table. Due to that such existing connections will be stopped. But then if SG will be added again to the port, those conntrack entries marked as invalid will not be removed and those hang connections will not be revived. To fix that, this patch adds deletion of the conntrack entries marked with CT_MARK_INVALID and related to the port of which SG are updated/added. Closes-Bug: #1915530 Change-Id: I84718b8ac4d8d6e39426e1c4485c2d7fe28185dd (cherry picked from commit 1e220d7136965acbfe50215d982cac0bd3dcf9c3) --- neutron/agent/linux/ip_conntrack.py | 25 ++++++++++++++++++- .../linux/openvswitch_firewall/firewall.py | 11 ++++++++ .../openvswitch_firewall/test_firewall.py | 21 ++++++++++++++++ .../unit/agent/linux/test_ip_conntrack.py | 23 +++++++++++++++++ 4 files changed, 79 insertions(+), 1 deletion(-) diff --git a/neutron/agent/linux/ip_conntrack.py b/neutron/agent/linux/ip_conntrack.py index c3594b0ff1f..eb537bed705 100644 --- a/neutron/agent/linux/ip_conntrack.py +++ b/neutron/agent/linux/ip_conntrack.py @@ -116,6 +116,7 @@ class IpConntrackManager(object): ethertype = rule.get('ethertype') protocol = rule.get('protocol') direction = rule.get('direction') + mark = rule.get('mark') cmd = ['conntrack', '-D'] if protocol is not None: # 0 is IP in /etc/protocols, but conntrack will throw an error @@ -123,6 +124,8 @@ class IpConntrackManager(object): protocol = 'ip' cmd.extend(['-p', str(protocol)]) cmd.extend(['-f', str(ethertype).lower()]) + if mark is not None: + cmd.extend(['-m', str(mark)]) cmd.append('-d' if direction == 'ingress' else '-s') cmd_ns = [] if namespace: @@ -173,10 +176,12 @@ class IpConntrackManager(object): self._process(device_info_list, rule) def delete_conntrack_state_by_remote_ips(self, device_info_list, - ethertype, remote_ips): + ethertype, remote_ips, mark=None): for direction in ['ingress', 'egress']: rule = {'ethertype': str(ethertype).lower(), 'direction': direction} + if mark: + rule['mark'] = mark self._process(device_info_list, rule, remote_ips) def _populate_initial_zone_map(self): @@ -254,3 +259,21 @@ class IpConntrackManager(object): return index + ZONE_START # conntrack zones exhausted :( :( raise exceptions.CTZoneExhaustedError() + + +class OvsIpConntrackManager(IpConntrackManager): + + def __init__(self, execute=None): + super(OvsIpConntrackManager, self).__init__( + get_rules_for_table_func=None, + filtered_ports={}, unfiltered_ports={}, + execute=execute, namespace=None, zone_per_port=False) + + def _populate_initial_zone_map(self): + self._device_zone_map = {} + + def get_device_zone(self, port, create=False): + of_port = port.get('of_port') + if of_port is None: + return + return of_port.vlan_tag diff --git a/neutron/agent/linux/openvswitch_firewall/firewall.py b/neutron/agent/linux/openvswitch_firewall/firewall.py index 65391e553a8..35cb9252551 100644 --- a/neutron/agent/linux/openvswitch_firewall/firewall.py +++ b/neutron/agent/linux/openvswitch_firewall/firewall.py @@ -32,6 +32,7 @@ from oslo_utils import netutils from neutron._i18n import _ from neutron.agent.common import ovs_lib from neutron.agent import firewall +from neutron.agent.linux import ip_conntrack from neutron.agent.linux.openvswitch_firewall import constants as ovsfw_consts from neutron.agent.linux.openvswitch_firewall import exceptions from neutron.agent.linux.openvswitch_firewall import iptables @@ -481,6 +482,7 @@ class OVSFirewallDriver(firewall.FirewallDriver): self._deferred = False self.iptables_helper = iptables.Helper(self.int_br.br) self.iptables_helper.load_driver_if_needed() + self.ipconntrack = ip_conntrack.OvsIpConntrackManager() self._initialize_firewall() callbacks_registry.subscribe( @@ -611,6 +613,12 @@ class OVSFirewallDriver(firewall.FirewallDriver): return get_physical_network_from_other_config( self.int_br.br, port_name) + def _delete_invalid_conntrack_entries_for_port(self, port, of_port): + port['of_port'] = of_port + for ethertype in [lib_const.IPv4, lib_const.IPv6]: + self.ipconntrack.delete_conntrack_state_by_remote_ips( + [port], ethertype, set(), mark=ovsfw_consts.CT_MARK_INVALID) + def get_ofport(self, port): port_id = port['device'] return self.sg_port_map.ports.get(port_id) @@ -665,6 +673,7 @@ class OVSFirewallDriver(firewall.FirewallDriver): self._update_flows_for_port(of_port, old_of_port) else: self._set_port_filters(of_port) + self._delete_invalid_conntrack_entries_for_port(port, of_port) except exceptions.OVSFWPortNotFound as not_found_error: LOG.info("port %(port_id)s does not exist in ovsdb: %(err)s.", {'port_id': port['device'], @@ -704,6 +713,8 @@ class OVSFirewallDriver(firewall.FirewallDriver): else: self._set_port_filters(of_port) + self._delete_invalid_conntrack_entries_for_port(port, of_port) + except exceptions.OVSFWPortNotFound as not_found_error: LOG.info("port %(port_id)s does not exist in ovsdb: %(err)s.", {'port_id': port['device'], diff --git a/neutron/tests/unit/agent/linux/openvswitch_firewall/test_firewall.py b/neutron/tests/unit/agent/linux/openvswitch_firewall/test_firewall.py index c7d8263e16e..fe20689ee8b 100644 --- a/neutron/tests/unit/agent/linux/openvswitch_firewall/test_firewall.py +++ b/neutron/tests/unit/agent/linux/openvswitch_firewall/test_firewall.py @@ -438,6 +438,9 @@ class TestOVSFirewallDriver(base.BaseTestCase): ovs_lib, 'OVSBridge', autospec=True).start() securitygroups_rpc.register_securitygroups_opts() self.firewall = ovsfw.OVSFirewallDriver(mock_bridge) + self.delete_invalid_conntrack_entries_mock = mock.patch.object( + self.firewall.ipconntrack, + "delete_conntrack_state_by_remote_ips").start() self.mock_bridge = self.firewall.int_br self.mock_bridge.reset_mock() self.fake_ovs_port = FakeOVSPort('port', 1, '00:00:00:00:00:00') @@ -462,6 +465,16 @@ class TestOVSFirewallDriver(base.BaseTestCase): 'direction': constants.EGRESS_DIRECTION}] self.firewall.update_security_group_rules(2, security_group_rules) + def _assert_invalid_conntrack_entries_deleted(self, port_dict): + port_dict['of_port'] = mock.Mock(vlan_tag=10) + self.delete_invalid_conntrack_entries_mock.assert_has_calls([ + mock.call( + [port_dict], constants.IPv4, set(), + mark=ovsfw_consts.CT_MARK_INVALID), + mock.call( + [port_dict], constants.IPv6, set(), + mark=ovsfw_consts.CT_MARK_INVALID)]) + @property def port_ofport(self): return self.mock_bridge.br.get_vif_port_by_id.return_value.ofport @@ -619,6 +632,7 @@ class TestOVSFirewallDriver(base.BaseTestCase): calls = self.mock_bridge.br.add_flow.call_args_list for call in exp_ingress_classifier, exp_egress_classifier, filter_rule: self.assertIn(call, calls) + self._assert_invalid_conntrack_entries_deleted(port_dict) def test_prepare_port_filter_port_security_disabled(self): port_dict = {'device': 'port-id', @@ -629,6 +643,7 @@ class TestOVSFirewallDriver(base.BaseTestCase): self.firewall, 'initialize_port_flows') as m_init_flows: self.firewall.prepare_port_filter(port_dict) self.assertFalse(m_init_flows.called) + self.delete_invalid_conntrack_entries_mock.assert_not_called() def _test_initialize_port_flows_dvr_conntrack_direct(self, network_type): port_dict = { @@ -800,6 +815,7 @@ class TestOVSFirewallDriver(base.BaseTestCase): self.assertFalse(self.mock_bridge.br.delete_flows.called) self.firewall.prepare_port_filter(port_dict) self.assertTrue(self.mock_bridge.br.delete_flows.called) + self._assert_invalid_conntrack_entries_deleted(port_dict) def test_update_port_filter(self): port_dict = {'device': 'port-id', @@ -831,6 +847,7 @@ class TestOVSFirewallDriver(base.BaseTestCase): table=ovs_consts.RULES_EGRESS_TABLE)] self.mock_bridge.br.add_flow.assert_has_calls( filter_rules, any_order=True) + self._assert_invalid_conntrack_entries_deleted(port_dict) def test_update_port_filter_create_new_port_if_not_present(self): port_dict = {'device': 'port-id', @@ -850,15 +867,18 @@ class TestOVSFirewallDriver(base.BaseTestCase): self.assertFalse(self.mock_bridge.br.delete_flows.called) self.assertTrue(initialize_port_flows_mock.called) self.assertTrue(add_flows_from_rules_mock.called) + self._assert_invalid_conntrack_entries_deleted(port_dict) def test_update_port_filter_port_security_disabled(self): port_dict = {'device': 'port-id', 'security_groups': [1]} self._prepare_security_group() self.firewall.prepare_port_filter(port_dict) + self.delete_invalid_conntrack_entries_mock.reset_mock() port_dict['port_security_enabled'] = False self.firewall.update_port_filter(port_dict) self.assertTrue(self.mock_bridge.br.delete_flows.called) + self.delete_invalid_conntrack_entries_mock.assert_not_called() def test_update_port_filter_applies_added_flows(self): """Check flows are applied right after _set_flows is called.""" @@ -879,6 +899,7 @@ class TestOVSFirewallDriver(base.BaseTestCase): self.mock_bridge.br.get_vif_port_by_id.return_value = None self.firewall.update_port_filter(port_dict) self.assertTrue(self.mock_bridge.br.delete_flows.called) + self._assert_invalid_conntrack_entries_deleted(port_dict) def test_remove_port_filter(self): port_dict = {'device': 'port-id', diff --git a/neutron/tests/unit/agent/linux/test_ip_conntrack.py b/neutron/tests/unit/agent/linux/test_ip_conntrack.py index 163b06dc2c9..52fdc4bf99f 100644 --- a/neutron/tests/unit/agent/linux/test_ip_conntrack.py +++ b/neutron/tests/unit/agent/linux/test_ip_conntrack.py @@ -39,3 +39,26 @@ class IPConntrackTestCase(base.BaseTestCase): dev_info_list = [dev_info for _ in range(10)] self.mgr._delete_conntrack_state(dev_info_list, rule) self.assertEqual(1, len(self.execute.mock_calls)) + + +class OvsIPConntrackTestCase(IPConntrackTestCase): + + def setUp(self): + super(IPConntrackTestCase, self).setUp() + self.execute = mock.Mock() + self.mgr = ip_conntrack.OvsIpConntrackManager(self.execute) + + def test_delete_conntrack_state_dedupes(self): + rule = {'ethertype': 'IPv4', 'direction': 'ingress'} + dev_info = { + 'device': 'tapdevice', + 'fixed_ips': ['1.2.3.4'], + 'of_port': mock.Mock(of_port=10)} + dev_info_list = [dev_info for _ in range(10)] + self.mgr._delete_conntrack_state(dev_info_list, rule) + self.assertEqual(1, len(self.execute.mock_calls)) + + def test_get_device_zone(self): + of_port = mock.Mock(vlan_tag=10) + port = {'id': 'port-id', 'of_port': of_port} + self.assertEqual(10, self.mgr.get_device_zone(port))