# Copyright 2018 Red Hat, Inc.
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.

import functools
import random
import threading
from unittest import mock

import netaddr
from neutron_lib import constants as n_cons
from oslo_utils import uuidutils
from pyroute2.iproute import linux as iproute_linux
from pyroute2.netlink import exceptions as netlink_exc
from pyroute2.netlink import rtnl
import testtools

from neutron.agent.linux import ip_lib
from neutron.agent.linux import utils as linux_utils
from neutron.common import utils as common_utils
from neutron.privileged.agent.linux import ip_lib as priv_ip_lib
from neutron.tests.common import net_helpers
from neutron.tests.functional import base as functional_base


class GetDeviceNamesTestCase(functional_base.BaseSudoTestCase):

    def _remove_ns(self, namespace):
        priv_ip_lib.remove_netns(namespace)

    def test_get_device_names(self):
        namespace = 'ns_test-' + uuidutils.generate_uuid()
        priv_ip_lib.create_netns(namespace)
        self.addCleanup(self._remove_ns, namespace)
        interfaces = ['int_01', 'int_02', 'int_03', 'int_04', 'int_05']
        interfaces_to_check = (interfaces + ip_lib.FB_TUNNEL_DEVICE_NAMES +
                               [ip_lib.LOOPBACK_DEVNAME])
        for interface in interfaces:
            priv_ip_lib.create_interface(interface, namespace, 'dummy')

        device_names = priv_ip_lib.get_device_names(namespace)
        self.assertGreater(len(device_names), 0)
        for name in device_names:
            self.assertIn(name, interfaces_to_check)

        for interface in interfaces:
            priv_ip_lib.delete_interface(interface, namespace)

        device_names = priv_ip_lib.get_device_names(namespace)
        self.assertGreater(len(device_names), 0)
        for name in device_names:
            self.assertNotIn(name, interfaces)


class GetLinkDevicesTestCase(functional_base.BaseSudoTestCase):

    def setUp(self):
        super().setUp()
        self.namespace = 'ns_test-' + uuidutils.generate_uuid()
        priv_ip_lib.create_netns(self.namespace)
        self.addCleanup(self._remove_ns, self.namespace)
        self.interfaces = ['int_01', 'int_02']
        self.interfaces_to_exclude = (ip_lib.FB_TUNNEL_DEVICE_NAMES +
                                      [ip_lib.LOOPBACK_DEVNAME])

    def _remove_ns(self, namespace):
        priv_ip_lib.remove_netns(namespace)

    def test_get_link_devices_lo(self):
        devices = priv_ip_lib.get_link_devices(self.namespace)
        self.assertGreater(len(devices), 0)
        for device in devices:
            if linux_utils.get_attr(device, 'IFLA_IFNAME') != 'lo':
                continue
            self.assertIsNone(linux_utils.get_attr(device, 'IFLA_LINKINFO'))
            break
        else:
            self.fail('Device "lo" not found')

    def test_get_link_devices_dummy(self):
        interfaces_tested = []
        for interface in self.interfaces:
            priv_ip_lib.create_interface(interface, self.namespace, 'dummy')

        devices = priv_ip_lib.get_link_devices(self.namespace)
        self.assertGreater(len(devices), 0)
        for device in devices:
            name = linux_utils.get_attr(device, 'IFLA_IFNAME')
            if name in self.interfaces_to_exclude:
                continue
            self.assertIn(name, self.interfaces)
            ifla_linkinfo = linux_utils.get_attr(device, 'IFLA_LINKINFO')
            self.assertEqual(
                linux_utils.get_attr(ifla_linkinfo, 'IFLA_INFO_KIND'),
                'dummy')
            interfaces_tested.append(name)
        self.assertEqual(sorted(interfaces_tested), sorted(self.interfaces))

    def test_get_link_devices_vlan(self):
        interfaces_tested = []
        vlan_interfaces = []
        vlan_id = 1000
        for interface in self.interfaces:
            priv_ip_lib.create_interface(interface, self.namespace, 'dummy')
            vlan_interface = interface + '_' + str(vlan_id)
            vlan_interfaces.append(vlan_interface)
            priv_ip_lib.create_interface(
                vlan_interface, self.namespace, 'vlan',
                physical_interface=interface, vlan_id=vlan_id)
            vlan_id += 1

        devices = priv_ip_lib.get_link_devices(self.namespace)
        self.assertGreater(len(devices), 0)
        device_name_index = {}
        for device in devices:
            name = linux_utils.get_attr(device, 'IFLA_IFNAME')
            device_name_index[name] = device['index']

        for device in devices:
            name = linux_utils.get_attr(device, 'IFLA_IFNAME')
            if name in self.interfaces_to_exclude:
                continue
            self.assertIn(name, self.interfaces + vlan_interfaces)
            ifla_linkinfo = linux_utils.get_attr(device, 'IFLA_LINKINFO')
            if name in vlan_interfaces:
                self.assertEqual(
                    linux_utils.get_attr(ifla_linkinfo, 'IFLA_INFO_KIND'),
                    'vlan')
                ifla_infodata = linux_utils.get_attr(ifla_linkinfo,
                                                     'IFLA_INFO_DATA')
                vlan_id = int(name.split('_')[-1])
                self.assertEqual(
                    linux_utils.get_attr(ifla_infodata, 'IFLA_VLAN_ID'),
                    vlan_id)
                vlan_link_name = self.interfaces[vlan_interfaces.index(name)]
                vlan_link_index = device_name_index[vlan_link_name]
                self.assertEqual(vlan_link_index,
                                 linux_utils.get_attr(device, 'IFLA_LINK'))
            interfaces_tested.append(name)
        self.assertEqual(sorted(interfaces_tested),
                         sorted(self.interfaces + vlan_interfaces))

    def test_get_link_devices_vxlan(self):
        interfaces_tested = []
        vxlan_interfaces = []
        vxlan_id = 1000
        for interface in self.interfaces:
            priv_ip_lib.create_interface(interface, self.namespace, 'dummy')
            vxlan_interface = interface + '_' + str(vxlan_id)
            vxlan_interfaces.append(vxlan_interface)
            priv_ip_lib.create_interface(
                vxlan_interface, self.namespace, 'vxlan',
                physical_interface=interface, vxlan_id=vxlan_id,
                vxlan_group='239.1.1.1')
            vxlan_id += 1

        devices = priv_ip_lib.get_link_devices(self.namespace)
        self.assertGreater(len(devices), 0)
        device_name_index = {}
        for device in devices:
            name = linux_utils.get_attr(device, 'IFLA_IFNAME')
            device_name_index[name] = device['index']

        for device in devices:
            name = linux_utils.get_attr(device, 'IFLA_IFNAME')
            if name in self.interfaces_to_exclude:
                continue
            self.assertIn(name, self.interfaces + vxlan_interfaces)
            ifla_linkinfo = linux_utils.get_attr(device, 'IFLA_LINKINFO')
            if name in vxlan_interfaces:
                self.assertEqual(
                    linux_utils.get_attr(ifla_linkinfo, 'IFLA_INFO_KIND'),
                    'vxlan')
                ifla_infodata = linux_utils.get_attr(ifla_linkinfo,
                                                     'IFLA_INFO_DATA')
                vxlan_id = int(name.split('_')[-1])
                self.assertEqual(
                    linux_utils.get_attr(ifla_infodata, 'IFLA_VXLAN_ID'),
                    vxlan_id)
                self.assertEqual(
                    linux_utils.get_attr(ifla_infodata, 'IFLA_VXLAN_GROUP'),
                    '239.1.1.1')
                vxlan_link_name = self.interfaces[vxlan_interfaces.index(name)]
                vxlan_link_index = device_name_index[vxlan_link_name]
                self.assertEqual(
                    vxlan_link_index,
                    linux_utils.get_attr(ifla_infodata, 'IFLA_VXLAN_LINK'))
            interfaces_tested.append(name)
        self.assertEqual(sorted(interfaces_tested),
                         sorted(self.interfaces + vxlan_interfaces))

    def _retrieve_interface(self, interface_name, namespace):
        for device in priv_ip_lib.get_link_devices(namespace):
            if interface_name == linux_utils.get_attr(device, 'IFLA_IFNAME'):
                return device
        self.fail('Interface "%s" not found' % interface_name)

    def test_get_link_devices_veth_different_namespaces(self):
        namespace2 = 'ns_test-' + uuidutils.generate_uuid()
        priv_ip_lib.create_netns(namespace2)
        self.addCleanup(self._remove_ns, namespace2)
        # Create a random number of dummy interfaces in namespace2, in order
        # to increase the 'veth1_2' interface index in its namespace.
        for idx in range(5, random.randint(15, 20)):
            priv_ip_lib.create_interface('int_%s' % idx, namespace2, 'dummy')

        ip_wrapper = ip_lib.IPWrapper(self.namespace)
        ip_wrapper.add_veth('veth1_1', 'veth1_2', namespace2)

        veth1_1 = self._retrieve_interface('veth1_1', self.namespace)
        veth1_2 = self._retrieve_interface('veth1_2', namespace2)

        ifla_linkinfo = linux_utils.get_attr(veth1_1, 'IFLA_LINKINFO')
        self.assertEqual(linux_utils.get_attr(ifla_linkinfo, 'IFLA_INFO_KIND'),
                         'veth')
        # NOTE(ralonsoh): since kernel_version=4.15.0-60-generic, iproute2
        # provides the veth pair index, even if the pair interface is in other
        # namespace. In previous versions, the parameter 'IFLA_LINK' was not
        # present. We need to handle both cases.
        self.assertIn(linux_utils.get_attr(veth1_1, 'IFLA_LINK'),
                      [None, veth1_2['index']])

    def test_get_link_devices_veth_same_namespaces(self):
        ip_wrapper = ip_lib.IPWrapper(self.namespace)
        ip_wrapper.add_veth('veth1_1', 'veth1_2')

        veth1_1 = self._retrieve_interface('veth1_1', self.namespace)
        veth1_2 = self._retrieve_interface('veth1_2', self.namespace)

        veth1_1_link = linux_utils.get_attr(veth1_1, 'IFLA_LINK')
        veth1_2_link = linux_utils.get_attr(veth1_2, 'IFLA_LINK')
        self.assertEqual(veth1_1['index'], veth1_2_link)
        self.assertEqual(veth1_2['index'], veth1_1_link)

    def test_get_link_devices_using_index(self):
        for interface in self.interfaces:
            priv_ip_lib.create_interface(interface, self.namespace, 'dummy')
        for expected_device in priv_ip_lib.get_link_devices(self.namespace):
            device = priv_ip_lib.get_link_devices(
                self.namespace, index=expected_device['index'])
            self.assertEqual(1, len(device))
            self.assertEqual(linux_utils.get_attr(expected_device,
                                                  'IFLA_IFNAME'),
                             linux_utils.get_attr(device[0], 'IFLA_IFNAME'))

        self.assertRaises(netlink_exc.NetlinkError,
                          priv_ip_lib.get_link_devices, self.namespace,
                          index=10000)


class BaseIpRuleTestCase(functional_base.BaseSudoTestCase):

    def setUp(self):
        super().setUp()
        self.namespace = 'ns_test-' + uuidutils.generate_uuid()
        self.ns = priv_ip_lib.create_netns(self.namespace)
        self.addCleanup(self._remove_ns)

    def _remove_ns(self):
        priv_ip_lib.remove_netns(self.namespace)

    def _check_rules(self, rules, parameters, values, exception_string=None,
                     raise_exception=True):
        for rule in rules:
            if all(rule.get(parameter) == value
                   for parameter, value in zip(parameters, values)):
                return True

        if raise_exception:
            self.fail('Rule with %s was expected' % exception_string)
        return False


class ListIpRulesTestCase(BaseIpRuleTestCase):

    RULE_TABLES = {'default': 253, 'main': 254, 'local': 255}

    def test_list_default_rules_ipv4(self):
        rules_ipv4 = priv_ip_lib.list_ip_rules(self.namespace, 4)
        self.assertEqual(3, len(rules_ipv4))
        rule_tables = list(self.RULE_TABLES.values())
        for rule in rules_ipv4:
            rule_tables.remove(rule['table'])
        self.assertEqual(0, len(rule_tables))

    def test_list_rules_ipv4(self):
        ip_lib.add_ip_rule(self.namespace, '192.168.0.1/24', table=10)
        rules_ipv4 = priv_ip_lib.list_ip_rules(self.namespace, 4)
        for rule in rules_ipv4:
            if rule['table'] == 10:
                self.assertEqual('192.168.0.1', rule['attrs']['FRA_SRC'])
                self.assertEqual(24, rule['src_len'])
                break
        else:
            self.fail('Rule added (192.168.0.1/24, table 10) not found')

    def test_list_default_rules_ipv6(self):
        rules_ipv6 = priv_ip_lib.list_ip_rules(self.namespace, 6)
        self.assertEqual(2, len(rules_ipv6))
        rule_tables = [255, 254]
        for rule in rules_ipv6:
            rule_tables.remove(rule['table'])
        self.assertEqual(0, len(rule_tables))

    def test_list_rules_ipv6(self):
        ip_lib.add_ip_rule(self.namespace, '2001:db8::1/64', table=20)
        rules_ipv6 = priv_ip_lib.list_ip_rules(self.namespace, 6)
        for rule in rules_ipv6:
            if rule['table'] == 20:
                self.assertEqual('2001:db8::1', rule['attrs']['FRA_SRC'])
                self.assertEqual(64, rule['src_len'])
                break
        else:
            self.fail('Rule added (2001:db8::1/64, table 20) not found')


class AddIpRulesTestCase(BaseIpRuleTestCase):

    def test_add_rule_ip(self):
        ip_addresses = ['192.168.200.250', '2001::250']
        for ip_address in ip_addresses:
            ip_version = common_utils.get_ip_version(ip_address)
            ip_lenght = common_utils.get_network_length(ip_version)
            ip_family = common_utils.get_socket_address_family(ip_version)
            priv_ip_lib.add_ip_rule(self.namespace, src=ip_address,
                                    src_len=ip_lenght, family=ip_family,
                                    table=ip_lib.IP_RULE_TABLES['default'])
            rules = ip_lib.list_ip_rules(self.namespace, ip_version)
            self._check_rules(rules, ['from'], [ip_address],
                              '"from" IP address %s' % ip_address)

            priv_ip_lib.delete_ip_rule(self.namespace, family=ip_family,
                                       src=ip_address, src_len=ip_lenght,
                                       table=ip_lib.IP_RULE_TABLES['default'])
            rules = ip_lib.list_ip_rules(self.namespace, ip_version)
            self.assertFalse(
                self._check_rules(rules, ['from'], [ip_address],
                                  raise_exception=False))

    def test_add_rule_iif(self):
        iif = 'iif_device_1'
        priv_ip_lib.create_interface(iif, self.namespace, 'dummy')
        priv_ip_lib.add_ip_rule(self.namespace, iifname=iif)
        rules = ip_lib.list_ip_rules(self.namespace, 4)
        self._check_rules(rules, ['iif'], [iif], 'iif name %s' % iif)

        priv_ip_lib.delete_ip_rule(self.namespace, iifname=iif)
        rules = ip_lib.list_ip_rules(self.namespace, 4)
        self.assertFalse(
            self._check_rules(rules, ['iif'], [iif], raise_exception=False))

    def test_add_rule_table(self):
        table = 212
        ip_addresses = ['192.168.200.251', '2001::251']
        for ip_address in ip_addresses:
            ip_version = common_utils.get_ip_version(ip_address)
            ip_lenght = common_utils.get_network_length(ip_version)
            ip_family = common_utils.get_socket_address_family(ip_version)
            priv_ip_lib.add_ip_rule(self.namespace, table=table,
                                    src=ip_address, src_len=ip_lenght,
                                    family=ip_family)
            rules = ip_lib.list_ip_rules(self.namespace, ip_version)
            self._check_rules(
                rules, ['table', 'from'], [str(table), ip_address],
                'table {} and "from" IP address {}'.format(table, ip_address))

            priv_ip_lib.delete_ip_rule(self.namespace, table=table,
                                       src=ip_address, src_len=ip_lenght,
                                       family=ip_family)
            rules = ip_lib.list_ip_rules(self.namespace, ip_version)
            self.assertFalse(
                self._check_rules(rules, ['table', 'from'],
                                  [str(table), ip_address],
                                  raise_exception=False))

    def test_add_rule_priority(self):
        priority = 12345
        ip_addresses = ['192.168.200.252', '2001::252']
        for ip_address in ip_addresses:
            ip_version = common_utils.get_ip_version(ip_address)
            ip_lenght = common_utils.get_network_length(ip_version)
            ip_family = common_utils.get_socket_address_family(ip_version)
            priv_ip_lib.add_ip_rule(self.namespace, priority=priority,
                                    src=ip_address, src_len=ip_lenght,
                                    family=ip_family,
                                    table=ip_lib.IP_RULE_TABLES['default'])
            rules = ip_lib.list_ip_rules(self.namespace, ip_version)
            self._check_rules(
                rules, ['priority', 'from'], [str(priority), ip_address],
                'priority %s and "from" IP address %s' %
                (priority, ip_address))

            priv_ip_lib.delete_ip_rule(self.namespace, priority=priority,
                                       src=ip_address, src_len=ip_lenght,
                                       family=ip_family,
                                       table=ip_lib.IP_RULE_TABLES['default'])
            rules = ip_lib.list_ip_rules(self.namespace, ip_version)
            self.assertFalse(
                self._check_rules(rules, ['priority', 'from'],
                                  [str(priority), ip_address],
                                  raise_exception=False))

    def test_add_rule_priority_table_iif(self):
        table = 213
        priority = 12346
        iif = 'iif_device_2'
        priv_ip_lib.create_interface(iif, self.namespace, 'dummy')
        priv_ip_lib.add_ip_rule(self.namespace, priority=priority, iifname=iif,
                                table=table)

        rules = ip_lib.list_ip_rules(self.namespace, 4)
        self._check_rules(
            rules, ['priority', 'iif', 'table'],
            [str(priority), iif, str(table)],
            'priority {}, table {} and iif name {}'.format(
                priority, table, iif))

        priv_ip_lib.delete_ip_rule(self.namespace, priority=priority,
                                   iifname=iif, table=table)
        rules = ip_lib.list_ip_rules(self.namespace, 4)
        self.assertFalse(
            self._check_rules(rules, ['priority', 'iif', 'table'],
                              [str(priority), iif, str(table)],
                              raise_exception=False))

    @testtools.skip('https://github.com/svinota/pyroute2/issues/566')
    def test_add_rule_exists(self):
        iif = 'iif_device_1'
        priv_ip_lib.create_interface(iif, self.namespace, 'dummy')
        priv_ip_lib.add_ip_rule(self.namespace, iifname=iif,
                                table=ip_lib.IP_RULE_TABLES['default'])
        rules = ip_lib.list_ip_rules(self.namespace, 4)
        self._check_rules(rules, ['iif'], [iif], 'iif name %s' % iif)
        self.assertEqual(4, len(rules))

        # pyroute2.netlink.exceptions.NetlinkError(17, 'File exists')
        # exception is catch.
        priv_ip_lib.add_ip_rule(self.namespace, iifname=iif,
                                table=ip_lib.IP_RULE_TABLES['default'])
        rules = ip_lib.list_ip_rules(self.namespace, 4)
        self._check_rules(rules, ['iif'], [iif], 'iif name %s' % iif)
        self.assertEqual(4, len(rules))


class DeleteIpRulesTestCase(BaseIpRuleTestCase):

    def test_delete_rule_no_entry(self):
        iif = 'iif_device'
        priv_ip_lib.create_interface(iif, self.namespace, 'dummy')

        try:
            # This should not raise for a non-existent entry
            priv_ip_lib.delete_ip_rule(self.namespace, iifname=iif)
        except Exception:
            self.fail('Delete IP rule threw unexpected exception')

        rules = ip_lib.list_ip_rules(self.namespace, 4)
        # There are always 3 rules by default
        self.assertEqual(3, len(rules))


class GetIpAddressesTestCase(functional_base.BaseSudoTestCase):

    def _remove_ns(self, namespace):
        priv_ip_lib.remove_netns(namespace)

    def test_get_ip_addresses(self):
        namespace = 'ns_test-' + uuidutils.generate_uuid()
        priv_ip_lib.create_netns(namespace)
        self.addCleanup(self._remove_ns, namespace)
        interfaces = {
            '20': {'cidr': '192.168.10.20/24', 'scope': 'link',
                   'add_broadcast': True},
            '30': {'cidr': '2001::1/64', 'scope': 'global',
                   'add_broadcast': False}}

        for int_name, int_parameters in interfaces.items():
            priv_ip_lib.create_interface(int_name, namespace, 'dummy',
                                         index=int(int_name))
            ip_lib.add_ip_address(
                int_parameters['cidr'], int_name, namespace,
                int_parameters['scope'], int_parameters['add_broadcast'])

        ip_addresses = priv_ip_lib.get_ip_addresses(namespace)
        for ip_address in ip_addresses:
            int_name = str(ip_address['index'])
            ip = linux_utils.get_attr(ip_address, 'IFA_ADDRESS')
            mask = ip_address['prefixlen']
            cidr = common_utils.ip_to_cidr(ip, mask)
            self.assertEqual(interfaces[int_name]['cidr'], cidr)
            self.assertEqual(interfaces[int_name]['scope'],
                             ip_lib.IP_ADDRESS_SCOPE[ip_address['scope']])


class RouteTestCase(functional_base.BaseSudoTestCase):

    def setUp(self):
        super().setUp()
        self.namespace = self.useFixture(net_helpers.NamespaceFixture()).name
        self.device_name = 'test_device'
        ip_lib.IPWrapper(self.namespace).add_dummy(self.device_name)
        self.device = ip_lib.IPDevice(self.device_name, self.namespace)
        self.device.link.set_up()

    def _check_gateway_or_multipath(self, route, gateway):
        if gateway is None or isinstance(gateway, str):
            self.assertEqual(gateway,
                             linux_utils.get_attr(route, 'RTA_GATEWAY'))
            return

        rta_multipath = linux_utils.get_attr(route, 'RTA_MULTIPATH')
        self.assertEqual(len(gateway), len(rta_multipath))
        for nexthop in gateway:
            to_check = {'hops': 0}
            if nexthop.get('device'):
                to_check['oif'] = priv_ip_lib.privileged_get_link_id(
                    nexthop['device'], self.namespace)
            if nexthop.get('weight'):
                to_check['hops'] = nexthop['weight'] - 1
            if nexthop.get('via'):
                to_check['gateway'] = nexthop['via']

            for mp in rta_multipath:
                mp['gateway'] = linux_utils.get_attr(mp, 'RTA_GATEWAY')
                for key in to_check:
                    if to_check[key] != mp[key]:
                        break
                else:
                    break
            else:
                self.fail('Route nexthops %s do not match with defined ones '
                          '%s' % (rta_multipath, gateway))

    def _check_routes(self, cidrs, table=None, gateway=None, metric=None,
                      scope=None, proto='static'):
        table = table or iproute_linux.DEFAULT_TABLE
        if not scope:
            scope = 'universe' if gateway else 'link'
        scope = priv_ip_lib.get_scope_name(scope)
        for cidr in cidrs:
            ip_version = common_utils.get_ip_version(cidr)
            if ip_version == n_cons.IP_VERSION_6 and not metric:
                metric = rtnl.rtmsg.IP6_RT_PRIO_USER
            if ip_version == n_cons.IP_VERSION_6:
                scope = 0
            routes = priv_ip_lib.list_ip_routes(self.namespace, ip_version)
            for route in routes:
                ip = linux_utils.get_attr(route, 'RTA_DST')
                mask = route['dst_len']
                if not (ip == str(netaddr.IPNetwork(cidr).ip) and
                        mask == netaddr.IPNetwork(cidr).cidr.prefixlen):
                    continue
                self.assertEqual(table, route['table'])
                self.assertEqual(
                    priv_ip_lib._IP_VERSION_FAMILY_MAP[ip_version],
                    route['family'])
                self._check_gateway_or_multipath(route, gateway)
                self.assertEqual(metric,
                                 linux_utils.get_attr(route, 'RTA_PRIORITY'))
                self.assertEqual(scope, route['scope'])
                self.assertEqual(rtnl.rt_proto[proto], route['proto'])
                break
            else:
                self.fail('CIDR %s not found in the list of routes' % cidr)

    def _check_gateway(self, gateway, table=None, metric=None):
        table = table or iproute_linux.DEFAULT_TABLE
        ip_version = common_utils.get_ip_version(gateway)
        if ip_version == n_cons.IP_VERSION_6 and not metric:
            metric = rtnl.rtmsg.IP6_RT_PRIO_USER
        scope = 0
        routes = priv_ip_lib.list_ip_routes(self.namespace, ip_version)
        for route in routes:
            if not (linux_utils.get_attr(route, 'RTA_GATEWAY') == gateway):
                continue
            self.assertEqual(table, route['table'])
            self.assertEqual(
                priv_ip_lib._IP_VERSION_FAMILY_MAP[ip_version],
                route['family'])
            self.assertEqual(gateway,
                             linux_utils.get_attr(route, 'RTA_GATEWAY'))
            self.assertEqual(scope, route['scope'])
            self.assertEqual(0, route['dst_len'])
            self.assertEqual(metric,
                             linux_utils.get_attr(route, 'RTA_PRIORITY'))
            break
        else:
            self.fail('Default gateway %s not found in the list of routes'
                      % gateway)

    def _add_route_device_and_check(self, table=None, metric=None,
                                    scope='link', proto='static'):
        cidrs = ['192.168.0.0/24', '172.90.0.0/16', '10.0.0.0/8',
                 '2001:db8::/64']
        for cidr in cidrs:
            ip_version = common_utils.get_ip_version(cidr)
            priv_ip_lib.add_ip_route(self.namespace, cidr, ip_version,
                                     device=self.device_name, table=table,
                                     metric=metric, scope=scope, proto=proto)

        self._check_routes(cidrs, table=table, metric=metric, scope=scope,
                           proto=proto)

    def test_add_route_device(self):
        self._add_route_device_and_check(table=None)

    def test_add_route_device_table(self):
        self._add_route_device_and_check(table=100)

    def test_add_route_device_metric(self):
        self._add_route_device_and_check(metric=50)

    def test_add_route_device_table_metric(self):
        self._add_route_device_and_check(table=200, metric=30)

    def test_add_route_device_scope_global(self):
        self._add_route_device_and_check(scope='global')

    def test_add_route_device_scope_site(self):
        self._add_route_device_and_check(scope='site')

    def test_add_route_device_scope_host(self):
        self._add_route_device_and_check(scope='host')

    def test_add_route_device_proto_static(self):
        self._add_route_device_and_check(proto='static')  # default

    def test_add_route_device_proto_redirect(self):
        self._add_route_device_and_check(proto='redirect')

    def test_add_route_device_proto_kernel(self):
        self._add_route_device_and_check(proto='kernel')

    def test_add_route_device_proto_boot(self):
        self._add_route_device_and_check(proto='boot')

    def test_add_route_via_ipv4(self):
        cidrs = ['192.168.0.0/24', '172.90.0.0/16', '10.0.0.0/8']
        int_cidr = '192.168.20.1/24'
        int_ip_address = str(netaddr.IPNetwork(int_cidr).ip)
        self.device.addr.add(int_cidr)
        for cidr in cidrs:
            ip_version = common_utils.get_ip_version(cidr)
            priv_ip_lib.add_ip_route(self.namespace, cidr, ip_version,
                                     via=int_ip_address)
        self._check_routes(cidrs, gateway=int_ip_address)

    def test_add_route_via_ipv6(self):
        cidrs = ['2001:db8::/64', 'faaa::/96']
        int_cidr = 'fd00::1/64'
        via_ip = 'fd00::2'
        self.device.addr.add(int_cidr)
        for cidr in cidrs:
            ip_version = common_utils.get_ip_version(cidr)
            priv_ip_lib.add_ip_route(self.namespace, cidr, ip_version,
                                     via=via_ip)
        self._check_routes(cidrs, gateway=via_ip)

    def test_add_default(self):
        ip_addresses = ['192.168.0.1/24', '172.90.0.1/16', '10.0.0.1/8',
                        '2001:db8::1/64', 'faaa::1/96']
        for ip_address in ip_addresses:
            ip_version = common_utils.get_ip_version(ip_address)
            if ip_version == n_cons.IP_VERSION_4:
                _ip = str(netaddr.IPNetwork(ip_address).ip)
            else:
                _ip = str(netaddr.IPNetwork(ip_address).ip + 1)
            self.device.addr.add(ip_address)
            priv_ip_lib.add_ip_route(self.namespace, None, ip_version,
                                     device=self.device_name, via=_ip)
            self._check_gateway(_ip)

    def test_add_multipath_route(self):
        self.device_name2 = 'test_device2'
        ip_lib.IPWrapper(self.namespace).add_dummy(self.device_name2)
        self.device2 = ip_lib.IPDevice(self.device_name2, self.namespace)
        self.device2.link.set_up()
        self.device.addr.add('10.1.0.1/24')
        self.device2.addr.add('10.2.0.1/24')
        multipath = [
            {'device': self.device_name, 'via': '10.1.0.100', 'weight': 10},
            {'device': self.device_name2, 'via': '10.2.0.100', 'weight': 20},
            {'via': '10.2.0.101', 'weight': 30},
            {'via': '10.2.0.102'}]
        priv_ip_lib.add_ip_route(self.namespace, '192.168.0.0/24',
                                 n_cons.IP_VERSION_4, via=multipath)
        self._check_routes(['192.168.0.0/24'], gateway=multipath)

    def test_delete_route_no_entry(self):
        cidr = '192.168.0.0/24'
        self.device.addr.add('10.1.0.1/24')
        try:
            # This should not raise for a non-existent entry
            priv_ip_lib.delete_ip_route(self.namespace, cidr,
                                        n_cons.IP_VERSION_4,
                                        device=self.device_name)
        except Exception:
            self.fail('Delete IP route threw unexpected exception')

        routes = ip_lib.list_ip_routes(self.namespace, n_cons.IP_VERSION_4)
        # There will be a single interface route since we added an IP
        self.assertEqual(1, len(routes))


class GetLinkAttributesTestCase(functional_base.BaseSudoTestCase):

    def setUp(self):
        super().setUp()
        self.namespace = self.useFixture(net_helpers.NamespaceFixture()).name
        self.device_name = 'test_device'
        ip_lib.IPWrapper(self.namespace).add_dummy(self.device_name)
        self.device = ip_lib.IPDevice(self.device_name, self.namespace)
        self.pyroute_dev = priv_ip_lib.get_link_devices(
            self.namespace, ifname=self.device_name)
        self.assertEqual(1, len(self.pyroute_dev))
        self.pyroute_dev = self.pyroute_dev[0]

    def test_get_link_attribute_kind(self):
        ifla_linkinfo = linux_utils.get_attr(self.pyroute_dev, 'IFLA_LINKINFO')
        ifla_link_kind = linux_utils.get_attr(ifla_linkinfo, 'IFLA_INFO_KIND')
        self.assertEqual('dummy', ifla_link_kind)
        self.assertEqual(ifla_link_kind, self.device.link.link_kind)

    def test_get_link_attributes(self):
        expected_attr = ['mtu', 'qlen', 'state', 'qdisc', 'brd', 'link/ether',
                         'alias', 'allmulticast', 'link_kind']
        attr = self.device.link.attributes
        self.assertSetEqual(set(expected_attr), set(attr.keys()))


class ListNamespacePids(functional_base.BaseSudoTestCase):

    def setUp(self):
        super().setUp()
        self.namespace = self.useFixture(net_helpers.NamespaceFixture()).name
        self.timeout = 3

    @staticmethod
    def _run_sleep(namespace, timeout):
        ip_wrapper = ip_lib.IPWrapper(namespace=namespace)
        # NOTE(ralonsoh): this is a "long" (more than one second) lived
        # process. It should not be executed in a privsep context to avoid
        # a possible privsep thread starvation.
        ip_wrapper.netns.execute(['sleep', timeout], check_exit_code=False)

    def _check_pids(self, num_pids, namespace=None):
        namespace = self.namespace if not namespace else namespace
        self.pids = priv_ip_lib.list_ns_pids(namespace)
        return len(self.pids) == num_pids

    def test_list_namespace_pids(self):
        thread = threading.Thread(target=self._run_sleep,
                                  args=(self.namespace, self.timeout))
        thread.start()
        try:
            check_pids = functools.partial(self._check_pids, 1)
            common_utils.wait_until_true(check_pids, timeout=self.timeout)
        except common_utils.WaitTimeout:
            self.fail('Process no found in namespace %s' % self.namespace)
        thread.join(timeout=self.timeout)

    def test_list_namespace_pids_nothing_running_inside(self):
        self.assertTrue(self._check_pids(0))

    def test_list_namespace_not_created(self):
        self.assertTrue(self._check_pids(0, namespace='othernamespace'))


class GetLinkIdTestCase(functional_base.BaseSudoTestCase):

    def _remove_device(self, device_name):
        priv_ip_lib.delete_interface(device_name, None)

    def test_get_link_id_device_found(self):
        device_name = 'dev_' + uuidutils.generate_uuid()[:11]
        ip_lib.IPWrapper().add_dummy(device_name)
        ip_lib.IPDevice(device_name)
        self.addCleanup(self._remove_device, device_name)
        self.assertGreater(priv_ip_lib.get_link_id(device_name, None), 0)

    def test_get_link_id_device_not_found_raise_exception(self):
        device_name = 'strange_device'
        self.assertRaises(priv_ip_lib.NetworkInterfaceNotFound,
                          priv_ip_lib.get_link_id, device_name, None)

    def test_get_link_id_device_not_found_do_not_raise_exception(self):
        device_name = 'strange_device'
        with mock.patch.object(priv_ip_lib, 'LOG') as mock_log:
            priv_ip_lib.get_link_id(device_name, None, raise_exception=False)
        mock_log.debug.assert_called_once_with(
            'Interface %(dev)s not found in namespace %(namespace)s',
            {'dev': device_name, 'namespace': None})
