150 lines
5.0 KiB
Python
150 lines
5.0 KiB
Python
# Copyright 2015 Hewlett-Packard Development Company, L.P.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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#
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import functools
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from oslo_log import log as logging
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from oslo_utils import excutils
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from neutron.agent.linux import ip_lib
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LOG = logging.getLogger(__name__)
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NS_PREFIX = 'qrouter-'
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INTERNAL_DEV_PREFIX = 'qr-'
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EXTERNAL_DEV_PREFIX = 'qg-'
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# TODO(Carl) It is odd that this file needs this. It is a dvr detail.
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ROUTER_2_FIP_DEV_PREFIX = 'rfp-'
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def build_ns_name(prefix, identifier):
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"""Builds a namespace name from the given prefix and identifier
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:param prefix: The prefix which must end with '-' for legacy reasons
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:param identifier: The id associated with the namespace
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"""
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return prefix + identifier
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def get_prefix_from_ns_name(ns_name):
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"""Parses prefix from prefix-identifier
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:param ns_name: The name of a namespace
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:returns: The prefix ending with a '-' or None if there is no '-'
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"""
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dash_index = ns_name.find('-')
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if 0 <= dash_index:
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return ns_name[:dash_index + 1]
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def get_id_from_ns_name(ns_name):
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"""Parses identifier from prefix-identifier
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:param ns_name: The name of a namespace
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:returns: Identifier or None if there is no - to end the prefix
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"""
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dash_index = ns_name.find('-')
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if 0 <= dash_index:
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return ns_name[dash_index + 1:]
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def check_ns_existence(f):
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@functools.wraps(f)
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def wrapped(self, *args, **kwargs):
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if not self.exists():
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LOG.warning('Namespace %(name)s does not exist. Skipping '
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'%(func)s',
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{'name': self.name, 'func': f.__name__})
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return
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try:
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return f(self, *args, **kwargs)
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except RuntimeError:
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with excutils.save_and_reraise_exception() as ctx:
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if not self.exists():
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LOG.debug('Namespace %(name)s was concurrently deleted',
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self.name)
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ctx.reraise = False
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return wrapped
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class Namespace(object):
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def __init__(self, name, agent_conf, driver, use_ipv6):
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self.name = name
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self.ip_wrapper_root = ip_lib.IPWrapper()
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self.agent_conf = agent_conf
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self.driver = driver
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self.use_ipv6 = use_ipv6
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def create(self, ipv6_forwarding=True):
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# See networking (netdev) tree, file
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# Documentation/networking/ip-sysctl.txt for an explanation of
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# these sysctl values.
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ip_wrapper = self.ip_wrapper_root.ensure_namespace(self.name)
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cmd = ['sysctl', '-w', 'net.ipv4.ip_forward=1']
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ip_wrapper.netns.execute(cmd)
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# 1. Reply only if the target IP address is local address configured
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# on the incoming interface; and
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# 2. Always use the best local address
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cmd = ['sysctl', '-w', 'net.ipv4.conf.all.arp_ignore=1']
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ip_wrapper.netns.execute(cmd)
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cmd = ['sysctl', '-w', 'net.ipv4.conf.all.arp_announce=2']
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ip_wrapper.netns.execute(cmd)
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if self.use_ipv6:
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cmd = ['sysctl', '-w',
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'net.ipv6.conf.all.forwarding=%d' % int(ipv6_forwarding)]
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ip_wrapper.netns.execute(cmd)
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def delete(self):
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try:
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self.ip_wrapper_root.netns.delete(self.name)
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except RuntimeError:
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msg = 'Failed trying to delete namespace: %s'
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LOG.exception(msg, self.name)
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def exists(self):
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return self.ip_wrapper_root.netns.exists(self.name)
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class RouterNamespace(Namespace):
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def __init__(self, router_id, agent_conf, driver, use_ipv6):
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self.router_id = router_id
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name = self._get_ns_name(router_id)
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super(RouterNamespace, self).__init__(
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name, agent_conf, driver, use_ipv6)
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@classmethod
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def _get_ns_name(cls, router_id):
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return build_ns_name(NS_PREFIX, router_id)
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@check_ns_existence
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def delete(self):
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ns_ip = ip_lib.IPWrapper(namespace=self.name)
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for d in ns_ip.get_devices():
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if d.name.startswith(INTERNAL_DEV_PREFIX):
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# device is on default bridge
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self.driver.unplug(d.name, namespace=self.name,
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prefix=INTERNAL_DEV_PREFIX)
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elif d.name.startswith(ROUTER_2_FIP_DEV_PREFIX):
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ns_ip.del_veth(d.name)
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elif d.name.startswith(EXTERNAL_DEV_PREFIX):
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self.driver.unplug(
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d.name,
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namespace=self.name,
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prefix=EXTERNAL_DEV_PREFIX)
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super(RouterNamespace, self).delete()
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