293 lines
12 KiB
Python
293 lines
12 KiB
Python
# Copyright (c) 2015 OpenStack Foundation
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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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import os
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from oslo_log import log as logging
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from neutron.agent.l3 import fip_rule_priority_allocator as frpa
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from neutron.agent.l3 import link_local_allocator as lla
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from neutron.agent.l3 import namespaces
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from neutron.agent.linux import ip_lib
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from neutron.agent.linux import iptables_manager
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from neutron.common import utils as common_utils
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from neutron.ipam import utils as ipam_utils
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LOG = logging.getLogger(__name__)
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FIP_NS_PREFIX = 'fip-'
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FIP_EXT_DEV_PREFIX = 'fg-'
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FIP_2_ROUTER_DEV_PREFIX = 'fpr-'
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ROUTER_2_FIP_DEV_PREFIX = namespaces.ROUTER_2_FIP_DEV_PREFIX
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# Route Table index for FIPs
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FIP_RT_TBL = 16
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FIP_LL_SUBNET = '169.254.64.0/18'
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# Rule priority range for FIPs
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FIP_PR_START = 32768
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FIP_PR_END = FIP_PR_START + 40000
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class FipNamespace(namespaces.Namespace):
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def __init__(self, ext_net_id, agent_conf, driver, use_ipv6):
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name = self._get_ns_name(ext_net_id)
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super(FipNamespace, self).__init__(
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name, agent_conf, driver, use_ipv6)
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self._ext_net_id = ext_net_id
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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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self.agent_gateway_port = None
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self._subscribers = set()
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path = os.path.join(agent_conf.state_path, 'fip-priorities')
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self._rule_priorities = frpa.FipRulePriorityAllocator(path,
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FIP_PR_START,
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FIP_PR_END)
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self._iptables_manager = iptables_manager.IptablesManager(
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namespace=self.get_name(),
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use_ipv6=self.use_ipv6)
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path = os.path.join(agent_conf.state_path, 'fip-linklocal-networks')
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self.local_subnets = lla.LinkLocalAllocator(path, FIP_LL_SUBNET)
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self.destroyed = False
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@classmethod
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def _get_ns_name(cls, ext_net_id):
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return namespaces.build_ns_name(FIP_NS_PREFIX, ext_net_id)
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def get_name(self):
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return self._get_ns_name(self._ext_net_id)
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def get_ext_device_name(self, port_id):
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return (FIP_EXT_DEV_PREFIX + port_id)[:self.driver.DEV_NAME_LEN]
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def get_int_device_name(self, router_id):
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return (FIP_2_ROUTER_DEV_PREFIX + router_id)[:self.driver.DEV_NAME_LEN]
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def get_rtr_ext_device_name(self, router_id):
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return (ROUTER_2_FIP_DEV_PREFIX + router_id)[:self.driver.DEV_NAME_LEN]
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def has_subscribers(self):
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return len(self._subscribers) != 0
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def subscribe(self, external_net_id):
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is_first = not self.has_subscribers()
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self._subscribers.add(external_net_id)
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return is_first
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def unsubscribe(self, external_net_id):
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self._subscribers.discard(external_net_id)
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return not self.has_subscribers()
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def allocate_rule_priority(self, floating_ip):
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return self._rule_priorities.allocate(floating_ip)
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def deallocate_rule_priority(self, floating_ip):
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self._rule_priorities.release(floating_ip)
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def _gateway_added(self, ex_gw_port, interface_name):
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"""Add Floating IP gateway port."""
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LOG.debug("add gateway interface(%s)", interface_name)
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ns_name = self.get_name()
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self.driver.plug(ex_gw_port['network_id'],
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ex_gw_port['id'],
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interface_name,
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ex_gw_port['mac_address'],
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bridge=self.agent_conf.external_network_bridge,
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namespace=ns_name,
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prefix=FIP_EXT_DEV_PREFIX,
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mtu=ex_gw_port.get('mtu'))
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# Remove stale fg devices
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ip_wrapper = ip_lib.IPWrapper(namespace=ns_name)
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devices = ip_wrapper.get_devices()
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for device in devices:
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name = device.name
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if name.startswith(FIP_EXT_DEV_PREFIX) and name != interface_name:
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ext_net_bridge = self.agent_conf.external_network_bridge
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self.driver.unplug(name,
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bridge=ext_net_bridge,
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namespace=ns_name,
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prefix=FIP_EXT_DEV_PREFIX)
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ip_cidrs = common_utils.fixed_ip_cidrs(ex_gw_port['fixed_ips'])
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self.driver.init_l3(interface_name, ip_cidrs, namespace=ns_name,
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clean_connections=True)
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self.update_gateway_port(ex_gw_port)
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cmd = ['sysctl', '-w', 'net.ipv4.conf.%s.proxy_arp=1' % interface_name]
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ip_wrapper.netns.execute(cmd, check_exit_code=False)
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def create(self):
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# TODO(Carl) Get this functionality from mlavelle's namespace baseclass
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LOG.debug("DVR: add fip namespace: %s", self.name)
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ip_wrapper_root = ip_lib.IPWrapper()
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ip_wrapper = ip_wrapper_root.ensure_namespace(self.get_name())
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# Somewhere in the 3.19 kernel timeframe ip_nonlocal_bind was
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# changed to be a per-namespace attribute. To be backwards
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# compatible we need to try both if at first we fail.
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try:
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ip_wrapper.netns.execute(['sysctl',
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'-w',
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'net.ipv4.ip_nonlocal_bind=1'],
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log_fail_as_error=False,
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run_as_root=True)
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except RuntimeError:
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LOG.debug('DVR: fip namespace (%s) does not support setting '
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'net.ipv4.ip_nonlocal_bind, trying in root namespace',
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self.name)
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ip_wrapper_root.netns.execute(['sysctl',
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'-w',
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'net.ipv4.ip_nonlocal_bind=1'],
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run_as_root=True)
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ip_wrapper.netns.execute(['sysctl', '-w', 'net.ipv4.ip_forward=1'])
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if self.use_ipv6:
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ip_wrapper.netns.execute(['sysctl', '-w',
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'net.ipv6.conf.all.forwarding=1'])
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# no connection tracking needed in fip namespace
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self._iptables_manager.ipv4['raw'].add_rule('PREROUTING',
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'-j CT --notrack')
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self._iptables_manager.apply()
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def delete(self):
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self.destroyed = True
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self._delete()
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self.agent_gateway_port = None
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@namespaces.check_ns_existence
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def _delete(self):
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ip_wrapper = ip_lib.IPWrapper(namespace=self.name)
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for d in ip_wrapper.get_devices(exclude_loopback=True):
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if d.name.startswith(FIP_2_ROUTER_DEV_PREFIX):
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# internal link between IRs and FIP NS
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ip_wrapper.del_veth(d.name)
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elif d.name.startswith(FIP_EXT_DEV_PREFIX):
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# single port from FIP NS to br-ext
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# TODO(carl) Where does the port get deleted?
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LOG.debug('DVR: unplug: %s', d.name)
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ext_net_bridge = self.agent_conf.external_network_bridge
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self.driver.unplug(d.name,
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bridge=ext_net_bridge,
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namespace=self.name,
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prefix=FIP_EXT_DEV_PREFIX)
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# TODO(mrsmith): add LOG warn if fip count != 0
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LOG.debug('DVR: destroy fip namespace: %s', self.name)
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super(FipNamespace, self).delete()
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def create_gateway_port(self, agent_gateway_port):
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"""Create Floating IP gateway port.
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Request port creation from Plugin then creates
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Floating IP namespace and adds gateway port.
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"""
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self.create()
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iface_name = self.get_ext_device_name(agent_gateway_port['id'])
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self._gateway_added(agent_gateway_port, iface_name)
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def _check_for_gateway_ip_change(self, new_agent_gateway_port):
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def get_gateway_ips(gateway_port):
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gw_ips = {}
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if gateway_port:
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for subnet in gateway_port.get('subnets', []):
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gateway_ip = subnet.get('gateway_ip', None)
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if gateway_ip:
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ip_version = ip_lib.get_ip_version(gateway_ip)
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gw_ips[ip_version] = gateway_ip
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return gw_ips
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new_gw_ips = get_gateway_ips(new_agent_gateway_port)
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old_gw_ips = get_gateway_ips(self.agent_gateway_port)
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return new_gw_ips != old_gw_ips
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def update_gateway_port(self, agent_gateway_port):
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gateway_ip_not_changed = self.agent_gateway_port and (
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not self._check_for_gateway_ip_change(agent_gateway_port))
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self.agent_gateway_port = agent_gateway_port
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if gateway_ip_not_changed:
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return
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ns_name = self.get_name()
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interface_name = self.get_ext_device_name(agent_gateway_port['id'])
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for fixed_ip in agent_gateway_port['fixed_ips']:
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ip_lib.send_ip_addr_adv_notif(ns_name,
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interface_name,
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fixed_ip['ip_address'],
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self.agent_conf)
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ipd = ip_lib.IPDevice(interface_name, namespace=ns_name)
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for subnet in agent_gateway_port['subnets']:
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gw_ip = subnet.get('gateway_ip')
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if gw_ip:
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is_gateway_not_in_subnet = not ipam_utils.check_subnet_ip(
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subnet.get('cidr'), gw_ip)
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if is_gateway_not_in_subnet:
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ipd.route.add_route(gw_ip, scope='link')
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ipd.route.add_gateway(gw_ip)
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def _add_cidr_to_device(self, device, ip_cidr):
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if not device.addr.list(to=ip_cidr):
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device.addr.add(ip_cidr, add_broadcast=False)
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def create_rtr_2_fip_link(self, ri):
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"""Create interface between router and Floating IP namespace."""
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LOG.debug("Create FIP link interfaces for router %s", ri.router_id)
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rtr_2_fip_name = self.get_rtr_ext_device_name(ri.router_id)
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fip_2_rtr_name = self.get_int_device_name(ri.router_id)
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fip_ns_name = self.get_name()
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# add link local IP to interface
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if ri.rtr_fip_subnet is None:
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ri.rtr_fip_subnet = self.local_subnets.allocate(ri.router_id)
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rtr_2_fip, fip_2_rtr = ri.rtr_fip_subnet.get_pair()
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rtr_2_fip_dev = ip_lib.IPDevice(rtr_2_fip_name, namespace=ri.ns_name)
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fip_2_rtr_dev = ip_lib.IPDevice(fip_2_rtr_name, namespace=fip_ns_name)
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if not rtr_2_fip_dev.exists():
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ip_wrapper = ip_lib.IPWrapper(namespace=ri.ns_name)
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rtr_2_fip_dev, fip_2_rtr_dev = ip_wrapper.add_veth(rtr_2_fip_name,
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fip_2_rtr_name,
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fip_ns_name)
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mtu = (self.agent_conf.network_device_mtu or
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ri.get_ex_gw_port().get('mtu'))
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if mtu:
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rtr_2_fip_dev.link.set_mtu(mtu)
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fip_2_rtr_dev.link.set_mtu(mtu)
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rtr_2_fip_dev.link.set_up()
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fip_2_rtr_dev.link.set_up()
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self._add_cidr_to_device(rtr_2_fip_dev, str(rtr_2_fip))
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self._add_cidr_to_device(fip_2_rtr_dev, str(fip_2_rtr))
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# add default route for the link local interface
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rtr_2_fip_dev.route.add_gateway(str(fip_2_rtr.ip), table=FIP_RT_TBL)
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def scan_fip_ports(self, ri):
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# don't scan if not dvr or count is not None
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if ri.dist_fip_count is not None:
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return
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# scan system for any existing fip ports
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ri.dist_fip_count = 0
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rtr_2_fip_interface = self.get_rtr_ext_device_name(ri.router_id)
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device = ip_lib.IPDevice(rtr_2_fip_interface, namespace=ri.ns_name)
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if device.exists():
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ri.dist_fip_count = len(ri.get_router_cidrs(device))
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