Rodolfo Alonso Hernandez
c89c1f53db
Replace rootwrap execution with privsep context execution. This series of patches will progressively replace any rootwrap call. This patch replaces some "IpNetnsCommand" command execution methods. Change-Id: Ic5fdf221a2a2cd0951539b0e040d2a941feee287 Story: #2007686 Task: #41558
475 lines
21 KiB
Python
475 lines
21 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 contextlib
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import os
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from neutron_lib import constants as lib_constants
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from neutron_lib.exceptions import l3 as l3_exc
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from neutron_lib.utils import runtime
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from oslo_concurrency import lockutils
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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._i18n import _
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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.l3 import router_info
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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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# 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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# Fixed rule priority for Fast Path Exit rules
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FAST_PATH_EXIT_PR = 80000
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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(
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path, lib_constants.DVR_FIP_LL_CIDR)
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self.destroyed = False
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self._stale_fips_checked = 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 lookup_rule_priority(self, floating_ip):
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return self._rule_priorities.lookup(floating_ip)
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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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@contextlib.contextmanager
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def _fip_port_lock(self, interface_name):
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# Use a namespace and port-specific lock semaphore to allow for
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# concurrency
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lock_name = 'port-lock-' + self.name + '-' + interface_name
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with lockutils.lock(lock_name, runtime.SYNCHRONIZED_PREFIX):
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try:
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yield
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except Exception:
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with excutils.save_and_reraise_exception():
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LOG.error('DVR: FIP namespace config failure '
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'for interface %s', interface_name)
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def create_or_update_gateway_port(self, agent_gateway_port):
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interface_name = self.get_ext_device_name(agent_gateway_port['id'])
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# The lock is used to make sure another thread doesn't call to
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# update the gateway port before we are done initializing things.
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with self._fip_port_lock(interface_name):
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is_first = self.subscribe(agent_gateway_port['network_id'])
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if is_first:
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# Check for subnets that are populated for the agent
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# gateway port that was created on the server.
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if 'subnets' not in agent_gateway_port:
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self.unsubscribe(agent_gateway_port['network_id'])
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LOG.debug('DVR: Missing subnet in agent_gateway_port: %s',
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agent_gateway_port)
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return
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self._create_gateway_port(agent_gateway_port, interface_name)
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else:
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try:
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self._update_gateway_port(
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agent_gateway_port, interface_name)
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except Exception:
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# If an exception occurs at this point, then it is
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# good to clean up the namespace that has been created
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# and reraise the exception in order to resync the router
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with excutils.save_and_reraise_exception():
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self.unsubscribe(agent_gateway_port['network_id'])
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self.delete()
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LOG.exception('DVR: Gateway update in '
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'FIP namespace failed')
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def _create_gateway_port(self, ex_gw_port, interface_name):
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"""Create namespace, request port creationg from Plugin,
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then configure Floating IP gateway port.
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"""
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self.create()
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LOG.debug("DVR: adding 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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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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LOG.debug('DVR: unplug: %s', name)
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self.driver.unplug(name,
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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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gw_cidrs = [sn['cidr'] for sn in ex_gw_port['subnets']
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if sn.get('cidr')]
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self.driver.set_onlink_routes(
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interface_name, ns_name, ex_gw_port.get('extra_subnets', []),
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preserve_ips=gw_cidrs, is_ipv6=False)
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self.agent_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, privsep_exec=True)
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def create(self):
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LOG.debug("DVR: add fip namespace: %s", self.name)
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# parent class will ensure the namespace exists and turn-on forwarding
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super(FipNamespace, self).create()
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ip_lib.set_ip_nonlocal_bind_for_namespace(self.name, 1,
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root_namespace=True)
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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():
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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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self.driver.unplug(d.name,
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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 _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 = common_utils.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 get_fip_table_indexes(self, ip_version):
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ip_rules_list = ip_lib.list_ip_rules(self.get_name(), ip_version)
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tbl_index_list = []
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for ip_rule in ip_rules_list:
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tbl_index = ip_rule['table']
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if tbl_index in ['local', 'default', 'main']:
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continue
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tbl_index_list.append(tbl_index)
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return tbl_index_list
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def _add_default_gateway_for_fip(self, gw_ip, ip_device, tbl_index):
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"""Adds default gateway for fip based on the tbl_index passed."""
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if tbl_index is None:
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ip_version = common_utils.get_ip_version(gw_ip)
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tbl_index_list = self.get_fip_table_indexes(ip_version)
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for tbl_index in tbl_index_list:
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ip_device.route.add_gateway(gw_ip, table=tbl_index)
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else:
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ip_device.route.add_gateway(gw_ip, table=tbl_index)
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def _add_rtr_ext_route_rule_to_route_table(self, ri, fip_2_rtr,
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fip_2_rtr_name):
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"""Creates external route table and adds routing rules."""
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# TODO(Swami): Rename the _get_snat_idx function to some
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# generic name that can be used for SNAT and FIP
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rt_tbl_index = ri._get_snat_idx(fip_2_rtr)
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interface_name = self.get_ext_device_name(
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self.agent_gateway_port['id'])
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try:
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# The lock is used to make sure another thread doesn't call to
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# update the gateway route before we are done initializing things.
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with self._fip_port_lock(interface_name):
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self._update_gateway_route(self.agent_gateway_port,
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interface_name,
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tbl_index=rt_tbl_index)
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except Exception:
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# If an exception occurs at this point, then it is
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# good to unsubscribe this external network so that
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# the next call will trigger the interface to be plugged.
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# We reraise the exception in order to resync the router.
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with excutils.save_and_reraise_exception():
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self.unsubscribe(self.agent_gateway_port['network_id'])
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self.agent_gateway_port = None
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LOG.exception('DVR: Gateway setup in FIP namespace '
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'failed')
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# Now add the filter match rule for the table.
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ip_lib.add_ip_rule(namespace=self.get_name(), ip=str(fip_2_rtr.ip),
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iif=fip_2_rtr_name, table=rt_tbl_index,
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priority=rt_tbl_index)
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def _update_gateway_port(self, agent_gateway_port, interface_name):
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if (not self.agent_gateway_port or
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self._check_for_gateway_ip_change(agent_gateway_port)):
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# Caller already holding lock
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self._update_gateway_route(
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agent_gateway_port, interface_name, tbl_index=None)
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# Cache the agent gateway port after successfully updating
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# the gateway route, so that checking on self.agent_gateway_port
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# will be a valid check
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self.agent_gateway_port = agent_gateway_port
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gw_cidrs = [sn['cidr'] for sn in agent_gateway_port['subnets']
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if sn.get('cidr')]
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self.driver.set_onlink_routes(
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interface_name, self.get_name(),
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agent_gateway_port.get('extra_subnets', []), preserve_ips=gw_cidrs,
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is_ipv6=False)
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def _update_gateway_route(self, agent_gateway_port,
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interface_name, tbl_index):
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ns_name = self.get_name()
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ipd = ip_lib.IPDevice(interface_name, namespace=ns_name)
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# If the 'fg-' device doesn't exist in the namespace then trying
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# to send advertisements or configure the default route will just
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# throw exceptions. Unsubscribe this external network so that
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# the next call will trigger the interface to be plugged.
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if not ipd.exists():
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LOG.warning('DVR: FIP gateway port with interface '
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'name: %(device)s does not exist in the given '
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'namespace: %(ns)s', {'device': interface_name,
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'ns': ns_name})
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msg = _('DVR: Gateway update route in FIP namespace failed, retry '
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'should be attempted on next call')
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raise l3_exc.FloatingIpSetupException(msg)
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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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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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self._add_default_gateway_for_fip(gw_ip, ipd, tbl_index)
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else:
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current_gateway = ipd.route.get_gateway()
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if current_gateway and current_gateway.get('gateway'):
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ipd.route.delete_gateway(current_gateway.get('gateway'))
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def _add_cidr_to_device(self, device, ip_cidr):
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to = common_utils.cidr_to_ip(ip_cidr)
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if not device.addr.list(to=to):
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device.addr.add(ip_cidr, add_broadcast=False)
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def delete_rtr_2_fip_link(self, ri):
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"""Delete the interface between router and FloatingIP namespace."""
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LOG.debug("Delete 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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# remove default route entry
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if ri.rtr_fip_subnet is None:
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# see if there is a local subnet in the cache
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ri.rtr_fip_subnet = self.local_subnets.lookup(ri.router_id)
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if ri.rtr_fip_subnet:
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rtr_2_fip, fip_2_rtr = ri.rtr_fip_subnet.get_pair()
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device = ip_lib.IPDevice(rtr_2_fip_name, namespace=ri.ns_name)
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if device.exists():
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device.route.delete_gateway(str(fip_2_rtr.ip),
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table=FIP_RT_TBL)
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if self.agent_gateway_port:
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interface_name = self.get_ext_device_name(
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self.agent_gateway_port['id'])
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fg_device = ip_lib.IPDevice(
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interface_name, namespace=fip_ns_name)
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if fg_device.exists():
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# Remove the fip namespace rules and routes associated to
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# fpr interface route table.
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tbl_index = ri._get_snat_idx(fip_2_rtr)
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# Flush the table
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fg_device.route.flush(lib_constants.IP_VERSION_4,
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table=tbl_index)
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fg_device.route.flush(lib_constants.IP_VERSION_6,
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table=tbl_index)
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# Remove the rule lookup
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# /0 addresses for IPv4 and IPv6 are used to pass
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# IP protocol version information based on a
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# link-local address IP version. Using any of those
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# is equivalent to using 'from all' for iproute2.
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rule_ip = lib_constants.IP_ANY[fip_2_rtr.ip.version]
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ip_lib.delete_ip_rule(fip_ns_name, ip=rule_ip,
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iif=fip_2_rtr_name, table=tbl_index,
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priority=tbl_index)
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self.local_subnets.release(ri.router_id)
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ri.rtr_fip_subnet = None
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# Check for namespace before deleting the device
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if not self.destroyed:
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fns_ip = ip_lib.IPWrapper(namespace=fip_ns_name)
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if fns_ip.device(fip_2_rtr_name).exists():
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fns_ip.del_veth(fip_2_rtr_name)
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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()
|
|
rtr_2_fip_dev = ip_lib.IPDevice(rtr_2_fip_name, namespace=ri.ns_name)
|
|
fip_2_rtr_dev = ip_lib.IPDevice(fip_2_rtr_name, namespace=fip_ns_name)
|
|
|
|
if not rtr_2_fip_dev.exists():
|
|
ip_wrapper = ip_lib.IPWrapper(namespace=ri.ns_name)
|
|
rtr_2_fip_dev, fip_2_rtr_dev = ip_wrapper.add_veth(rtr_2_fip_name,
|
|
fip_2_rtr_name,
|
|
fip_ns_name)
|
|
rtr_2_fip_dev.link.set_up()
|
|
fip_2_rtr_dev.link.set_up()
|
|
|
|
mtu = ri.get_ex_gw_port().get('mtu')
|
|
if mtu:
|
|
rtr_2_fip_dev.link.set_mtu(mtu)
|
|
fip_2_rtr_dev.link.set_mtu(mtu)
|
|
|
|
self._add_cidr_to_device(rtr_2_fip_dev, str(rtr_2_fip))
|
|
self._add_cidr_to_device(fip_2_rtr_dev, str(fip_2_rtr))
|
|
|
|
# Add permanant ARP entries on each side of veth pair
|
|
rtr_2_fip_dev.neigh.add(common_utils.cidr_to_ip(fip_2_rtr),
|
|
fip_2_rtr_dev.link.address)
|
|
fip_2_rtr_dev.neigh.add(common_utils.cidr_to_ip(rtr_2_fip),
|
|
rtr_2_fip_dev.link.address)
|
|
|
|
self._add_rtr_ext_route_rule_to_route_table(ri, fip_2_rtr,
|
|
fip_2_rtr_name)
|
|
|
|
# add default route for the link local interface
|
|
rtr_2_fip_dev.route.add_gateway(str(fip_2_rtr.ip), table=FIP_RT_TBL)
|
|
|
|
def scan_fip_ports(self, ri):
|
|
# scan system for any existing fip ports
|
|
rtr_2_fip_interface = self.get_rtr_ext_device_name(ri.router_id)
|
|
device = ip_lib.IPDevice(rtr_2_fip_interface, namespace=ri.ns_name)
|
|
if device.exists():
|
|
if len(ri.get_router_cidrs(device)):
|
|
self.rtr_fip_connect = True
|
|
else:
|
|
self.rtr_fip_connect = False
|
|
# On upgrade, there could be stale IP addresses configured, check
|
|
# and remove them once.
|
|
# TODO(haleyb): this can go away after a cycle or two
|
|
if not self._stale_fips_checked:
|
|
stale_cidrs = (
|
|
ip for ip in router_info.RouterInfo.get_router_cidrs(
|
|
ri, device)
|
|
if common_utils.is_cidr_host(ip))
|
|
for ip_cidr in stale_cidrs:
|
|
LOG.debug("Removing stale floating ip %s from interface "
|
|
"%s in namespace %s",
|
|
ip_cidr, rtr_2_fip_interface, ri.ns_name)
|
|
device.delete_addr_and_conntrack_state(ip_cidr)
|
|
self._stale_fips_checked = True
|