89 lines
3.5 KiB
Python
89 lines
3.5 KiB
Python
#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import netaddr
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from oslo_log import log as logging
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from neutron._i18n import _LE
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from neutron.agent.linux import utils as linux_utils
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LOG = logging.getLogger(__name__)
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class IpConntrackManager(object):
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"""Smart wrapper for ip conntrack."""
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def __init__(self, zone_lookup_func, execute=None, namespace=None):
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self.get_device_zone = zone_lookup_func
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self.execute = execute or linux_utils.execute
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self.namespace = namespace
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@staticmethod
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def _generate_conntrack_cmd_by_rule(rule, namespace):
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ethertype = rule.get('ethertype')
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protocol = rule.get('protocol')
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direction = rule.get('direction')
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cmd = ['conntrack', '-D']
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if protocol:
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cmd.extend(['-p', str(protocol)])
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cmd.extend(['-f', str(ethertype).lower()])
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cmd.append('-d' if direction == 'ingress' else '-s')
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cmd_ns = []
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if namespace:
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cmd_ns.extend(['ip', 'netns', 'exec', namespace])
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cmd_ns.extend(cmd)
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return cmd_ns
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def _get_conntrack_cmds(self, device_info_list, rule, remote_ip=None):
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conntrack_cmds = []
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cmd = self._generate_conntrack_cmd_by_rule(rule, self.namespace)
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ethertype = rule.get('ethertype')
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for device_info in device_info_list:
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zone_id = self.get_device_zone(device_info['device'])
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ips = device_info.get('fixed_ips', [])
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for ip in ips:
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net = netaddr.IPNetwork(ip)
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if str(net.version) not in ethertype:
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continue
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ip_cmd = [str(net.ip), '-w', zone_id]
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if remote_ip and str(
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netaddr.IPNetwork(remote_ip).version) in ethertype:
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ip_cmd.extend(['-s', str(remote_ip)])
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conntrack_cmds.append(cmd + ip_cmd)
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return conntrack_cmds
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def _delete_conntrack_state(self, device_info_list, rule, remote_ip=None):
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conntrack_cmds = self._get_conntrack_cmds(device_info_list,
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rule, remote_ip)
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for cmd in conntrack_cmds:
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try:
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self.execute(cmd, run_as_root=True,
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check_exit_code=True,
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extra_ok_codes=[1])
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except RuntimeError:
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LOG.exception(
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_LE("Failed execute conntrack command %s"), str(cmd))
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def delete_conntrack_state_by_rule(self, device_info_list, rule):
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self._delete_conntrack_state(device_info_list, rule)
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def delete_conntrack_state_by_remote_ips(self, device_info_list,
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ethertype, remote_ips):
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rule = {'ethertype': str(ethertype).lower(), 'direction': 'ingress'}
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if remote_ips:
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for remote_ip in remote_ips:
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self._delete_conntrack_state(
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device_info_list, rule, remote_ip)
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else:
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self._delete_conntrack_state(device_info_list, rule)
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