interface.py
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interface.py
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	# Copyright 2019-2021 VyOS maintainers and contributors <maintainers@vyos.io>
	#
	# This library is free software; you can redistribute it and/or
	# modify it under the terms of the GNU Lesser General Public
	# License as published by the Free Software Foundation; either
	# version 2.1 of the License, or (at your option) any later version.
	#
	# This library is distributed in the hope that it will be useful,
	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	# Lesser General Public License for more details.
	#
	# You should have received a copy of the GNU Lesser General Public
	# License along with this library. If not, see <http://www.gnu.org/licenses/>.

	from netifaces import interfaces
	import os
	import re
	import json
	import jmespath

	from copy import deepcopy
	from glob import glob

	from ipaddress import IPv4Network
	from netifaces import ifaddresses
	# this is not the same as socket.AF_INET/INET6
	from netifaces import AF_INET
	from netifaces import AF_INET6

	from vyos import ConfigError
	from vyos.configdict import list_diff
	from vyos.configdict import dict_merge
	from vyos.configdict import get_vlan_ids
	from vyos.template import render
	from vyos.util import mac2eui64
	from vyos.util import dict_search
	from vyos.util import read_file
	from vyos.util import get_interface_config
	from vyos.util import is_systemd_service_active
	from vyos.template import is_ipv4
	from vyos.template import is_ipv6
	from vyos.validate import is_intf_addr_assigned
	from vyos.validate import is_ipv6_link_local
	from vyos.validate import assert_boolean
	from vyos.validate import assert_list
	from vyos.validate import assert_mac
	from vyos.validate import assert_mtu
	from vyos.validate import assert_positive
	from vyos.validate import assert_range

	from vyos.ifconfig.control import Control
	from vyos.ifconfig.vrrp import VRRP
	from vyos.ifconfig.operational import Operational
	from vyos.ifconfig import Section

	from netaddr import EUI
	from netaddr import mac_unix_expanded

	class Interface(Control):
	# This is the class which will be used to create
	# self.operational, it allows subclasses, such as
	# WireGuard to modify their display behaviour
	OperationalClass = Operational

	options = ['debug', 'create']
	required = []
	default = {
	'debug': True,
	'create': True,
	}
	definition = {
	'section': '',
	'prefixes': [],
	'vlan': False,
	'bondable': False,
	'broadcast': False,
	'bridgeable': False,
	'eternal': '',
	}

	_command_get = {
	'admin_state': {
	'shellcmd': 'ip -json link show dev {ifname}',
	'format': lambda j: 'up' if 'UP' in jmespath.search('[*].flags \| [0]', json.loads(j)) else 'down',
	},
	'alias': {
	'shellcmd': 'ip -json -detail link list dev {ifname}',
	'format': lambda j: jmespath.search('[*].ifalias \| [0]', json.loads(j)) or '',
	},
	'mac': {
	'shellcmd': 'ip -json -detail link list dev {ifname}',
	'format': lambda j: jmespath.search('[*].address \| [0]', json.loads(j)),
	},
	'min_mtu': {
	'shellcmd': 'ip -json -detail link list dev {ifname}',
	'format': lambda j: jmespath.search('[*].min_mtu \| [0]', json.loads(j)),
	},
	'max_mtu': {
	'shellcmd': 'ip -json -detail link list dev {ifname}',
	'format': lambda j: jmespath.search('[*].max_mtu \| [0]', json.loads(j)),
	},
	'mtu': {
	'shellcmd': 'ip -json -detail link list dev {ifname}',
	'format': lambda j: jmespath.search('[*].mtu \| [0]', json.loads(j)),
	},
	'oper_state': {
	'shellcmd': 'ip -json -detail link list dev {ifname}',
	'format': lambda j: jmespath.search('[*].operstate \| [0]', json.loads(j)),
	},
	'vrf': {
	'shellcmd': 'ip -json -detail link list dev {ifname}',
	'format': lambda j: jmespath.search('[*].master \| [0]', json.loads(j)),
	},
	}

	_command_set = {
	'admin_state': {
	'validate': lambda v: assert_list(v, ['up', 'down']),
	'shellcmd': 'ip link set dev {ifname} {value}',
	},
	'alias': {
	'convert': lambda name: name if name else '',
	'shellcmd': 'ip link set dev {ifname} alias "{value}"',
	},
	'bridge_port_isolation': {
	'validate': lambda v: assert_list(v, ['on', 'off']),
	'shellcmd': 'bridge link set dev {ifname} isolated {value}',
	},
	'mac': {
	'validate': assert_mac,
	'shellcmd': 'ip link set dev {ifname} address {value}',
	},
	'mtu': {
	'validate': assert_mtu,
	'shellcmd': 'ip link set dev {ifname} mtu {value}',
	},
	'vrf': {
	'convert': lambda v: f'master {v}' if v else 'nomaster',
	'shellcmd': 'ip link set dev {ifname} {value}',
	},
	}

	_sysfs_set = {
	'arp_cache_tmo': {
	'location': '/proc/sys/net/ipv4/neigh/{ifname}/base_reachable_time_ms',
	},
	'arp_filter': {
	'validate': assert_boolean,
	'location': '/proc/sys/net/ipv4/conf/{ifname}/arp_filter',
	},
	'arp_accept': {
	'validate': lambda arp: assert_range(arp,0,2),
	'location': '/proc/sys/net/ipv4/conf/{ifname}/arp_accept',
	},
	'arp_announce': {
	'validate': assert_boolean,
	'location': '/proc/sys/net/ipv4/conf/{ifname}/arp_announce',
	},
	'arp_ignore': {
	'validate': assert_boolean,
	'location': '/proc/sys/net/ipv4/conf/{ifname}/arp_ignore',
	},
	'ipv4_forwarding': {
	'validate': assert_boolean,
	'location': '/proc/sys/net/ipv4/conf/{ifname}/forwarding',
	},
	'rp_filter': {
	'validate': lambda flt: assert_range(flt,0,3),
	'location': '/proc/sys/net/ipv4/conf/{ifname}/rp_filter',
	},
	'ipv6_accept_ra': {
	'validate': lambda ara: assert_range(ara,0,3),
	'location': '/proc/sys/net/ipv6/conf/{ifname}/accept_ra',
	},
	'ipv6_autoconf': {
	'validate': lambda aco: assert_range(aco,0,2),
	'location': '/proc/sys/net/ipv6/conf/{ifname}/autoconf',
	},
	'ipv6_forwarding': {
	'validate': lambda fwd: assert_range(fwd,0,2),
	'location': '/proc/sys/net/ipv6/conf/{ifname}/forwarding',
	},
	'ipv6_dad_transmits': {
	'validate': assert_positive,
	'location': '/proc/sys/net/ipv6/conf/{ifname}/dad_transmits',
	},
	'path_cost': {
	# XXX: we should set a maximum
	'validate': assert_positive,
	'location': '/sys/class/net/{ifname}/brport/path_cost',
	'errormsg': '{ifname} is not a bridge port member'
	},
	'path_priority': {
	# XXX: we should set a maximum
	'validate': assert_positive,
	'location': '/sys/class/net/{ifname}/brport/priority',
	'errormsg': '{ifname} is not a bridge port member'
	},
	'proxy_arp': {
	'validate': assert_boolean,
	'location': '/proc/sys/net/ipv4/conf/{ifname}/proxy_arp',
	},
	'proxy_arp_pvlan': {
	'validate': assert_boolean,
	'location': '/proc/sys/net/ipv4/conf/{ifname}/proxy_arp_pvlan',
	},
	# link_detect vs link_filter name weirdness
	'link_detect': {
	'validate': lambda link: assert_range(link,0,3),
	'location': '/proc/sys/net/ipv4/conf/{ifname}/link_filter',
	},
	}

	_sysfs_get = {
	'arp_cache_tmo': {
	'location': '/proc/sys/net/ipv4/neigh/{ifname}/base_reachable_time_ms',
	},
	'arp_filter': {
	'location': '/proc/sys/net/ipv4/conf/{ifname}/arp_filter',
	},
	'arp_accept': {
	'location': '/proc/sys/net/ipv4/conf/{ifname}/arp_accept',
	},
	'arp_announce': {
	'location': '/proc/sys/net/ipv4/conf/{ifname}/arp_announce',
	},
	'arp_ignore': {
	'location': '/proc/sys/net/ipv4/conf/{ifname}/arp_ignore',
	},
	'ipv4_forwarding': {
	'location': '/proc/sys/net/ipv4/conf/{ifname}/forwarding',
	},
	'rp_filter': {
	'location': '/proc/sys/net/ipv4/conf/{ifname}/rp_filter',
	},
	'ipv6_accept_ra': {
	'location': '/proc/sys/net/ipv6/conf/{ifname}/accept_ra',
	},
	'ipv6_autoconf': {
	'location': '/proc/sys/net/ipv6/conf/{ifname}/autoconf',
	},
	'ipv6_forwarding': {
	'location': '/proc/sys/net/ipv6/conf/{ifname}/forwarding',
	},
	'ipv6_dad_transmits': {
	'location': '/proc/sys/net/ipv6/conf/{ifname}/dad_transmits',
	},
	'proxy_arp': {
	'location': '/proc/sys/net/ipv4/conf/{ifname}/proxy_arp',
	},
	'proxy_arp_pvlan': {
	'location': '/proc/sys/net/ipv4/conf/{ifname}/proxy_arp_pvlan',
	},
	'link_detect': {
	'location': '/proc/sys/net/ipv4/conf/{ifname}/link_filter',
	},
	}

	@classmethod
	def exists(cls, ifname):
	return os.path.exists(f'/sys/class/net/{ifname}')

	@classmethod
	def get_config(cls):
	"""
	Some but not all interfaces require a configuration when they are added
	using iproute2. This method will provide the configuration dictionary
	used by this class.
	"""
	return deepcopy(cls.default)

	def __init__(self, ifname, **kargs):
	"""
	This is the base interface class which supports basic IP/MAC address
	operations as well as DHCP(v6). Other interface which represent e.g.
	and ethernet bridge are implemented as derived classes adding all
	additional functionality.

	For creation you will need to provide the interface type, otherwise
	the existing interface is used

	DEBUG:
	This class has embedded debugging (print) which can be enabled by
	creating the following file:
	vyos@vyos# touch /tmp/vyos.ifconfig.debug

	Example:
	>>> from vyos.ifconfig import Interface
	>>> i = Interface('eth0')
	"""
	self.config = deepcopy(kargs)
	self.config['ifname'] = self.ifname = ifname

	self._admin_state_down_cnt = 0

	# we must have updated config before initialising the Interface
	super().__init__(**kargs)

	if not self.exists(ifname):
	# Any instance of Interface, such as Interface('eth0') can be used
	# safely to access the generic function in this class as 'type' is
	# unset, the class can not be created
	if not self.iftype:
	raise Exception(f'interface "{ifname}" not found')
	self.config['type'] = self.iftype

	# Should an Instance of a child class (EthernetIf, DummyIf, ..)
	# be required, then create should be set to False to not accidentally create it.
	# In case a subclass does not define it, we use get to set the default to True
	if self.config.get('create',True):
	for k in self.required:
	if k not in kargs:
	name = self.default['type']
	raise ConfigError(f'missing required option {k} for {name} {ifname} creation')

	self._create()
	# If we can not connect to the interface then let the caller know
	# as the class could not be correctly initialised
	else:
	raise Exception(f'interface "{ifname}" not found!')

	# temporary list of assigned IP addresses
	self._addr = []

	self.operational = self.OperationalClass(ifname)
	self.vrrp = VRRP(ifname)

	def _create(self):
	cmd = 'ip link add dev {ifname} type {type}'.format(**self.config)
	self._cmd(cmd)

	def remove(self):
	"""
	Remove interface from operating system. Removing the interface
	deconfigures all assigned IP addresses and clear possible DHCP(v6)
	client processes.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> i = Interface('eth0')
	>>> i.remove()
	"""

	# remove all assigned IP addresses from interface - this is a bit redundant
	# as the kernel will remove all addresses on interface deletion, but we
	# can not delete ALL interfaces, see below
	self.flush_addrs()

	# ---------------------------------------------------------------------
	# Any class can define an eternal regex in its definition
	# interface matching the regex will not be deleted

	eternal = self.definition['eternal']
	if not eternal:
	self._delete()
	elif not re.match(eternal, self.ifname):
	self._delete()

	def _delete(self):
	# NOTE (Improvement):
	# after interface removal no other commands should be allowed
	# to be called and instead should raise an Exception:
	cmd = 'ip link del dev {ifname}'.format(**self.config)
	return self._cmd(cmd)

	def _set_vrf_ct_zone(self, vrf):
	"""
	Add/Remove rules in nftables to associate traffic in VRF to an
	individual conntack zone
	"""
	if vrf:
	# Get routing table ID for VRF
	vrf_table_id = get_interface_config(vrf).get('linkinfo', {}).get(
	'info_data', {}).get('table')
	# Add map element with interface and zone ID
	if vrf_table_id:
	self._cmd(f'nft add element inet vrf_zones ct_iface_map {{ "{self.ifname}" : {vrf_table_id} }}')
	else:
	nft_del_element = f'delete element inet vrf_zones ct_iface_map {{ "{self.ifname}" }}'
	# Check if deleting is possible first to avoid raising errors
	_, err = self._popen(f'nft -c {nft_del_element}')
	if not err:
	# Remove map element
	self._cmd(f'nft {nft_del_element}')

	def get_min_mtu(self):
	"""
	Get hardware minimum supported MTU

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').get_min_mtu()
	'60'
	"""
	return int(self.get_interface('min_mtu'))

	def get_max_mtu(self):
	"""
	Get hardware maximum supported MTU

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').get_max_mtu()
	'9000'
	"""
	return int(self.get_interface('max_mtu'))

	def get_mtu(self):
	"""
	Get/set interface mtu in bytes.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').get_mtu()
	'1500'
	"""
	return int(self.get_interface('mtu'))

	def set_mtu(self, mtu):
	"""
	Get/set interface mtu in bytes.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').set_mtu(1400)
	>>> Interface('eth0').get_mtu()
	'1400'
	"""
	tmp = self.get_interface('mtu')
	if str(tmp) == mtu:
	return None
	return self.set_interface('mtu', mtu)

	def get_mac(self):
	"""
	Get current interface MAC (Media Access Contrl) address used.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').get_mac()
	'00:50:ab:cd:ef:00'
	"""
	return self.get_interface('mac')

	def get_mac_synthetic(self):
	"""
	Get a synthetic MAC address. This is a common method which can be called
	from derived classes to overwrite the get_mac() call in a generic way.

	NOTE: Tunnel interfaces have no "MAC" address by default. The content
	of the 'address' file in /sys/class/net/device contains the
	local-ip thus we generate a random MAC address instead

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').get_mac()
	'00:50:ab:cd:ef:00'
	"""
	from hashlib import sha256

	# Get processor ID number
	cpu_id = self._cmd('sudo dmidecode -t 4 \| grep ID \| head -n1 \| sed "s/.*ID://;s/ //g"')
	# Get system eth0 base MAC address - every system has eth0
	eth0_mac = Interface('eth0').get_mac()

	sha = sha256()
	# Calculate SHA256 sum based on the CPU ID number, eth0 mac address and
	# this interface identifier - this is as predictable as an interface
	# MAC address and thus can be used in the same way
	sha.update(cpu_id.encode())
	sha.update(eth0_mac.encode())
	sha.update(self.ifname.encode())
	# take the most significant 48 bits from the SHA256 string
	tmp = sha.hexdigest()[:12]
	# Convert pseudo random string into EUI format which now represents a
	# MAC address
	tmp = EUI(tmp).value
	# set locally administered bit in MAC address
	tmp \|= 0xf20000000000
	# convert integer to "real" MAC address representation
	mac = EUI(hex(tmp).split('x')[-1])
	# change dialect to use : as delimiter instead of -
	mac.dialect = mac_unix_expanded
	return str(mac)

	def set_mac(self, mac):
	"""
	Set interface MAC (Media Access Contrl) address to given value.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').set_mac('00:50:ab:cd:ef:01')
	"""

	# If MAC is unchanged, bail out early
	if mac == self.get_mac():
	return None

	# MAC address can only be changed if interface is in 'down' state
	prev_state = self.get_admin_state()
	if prev_state == 'up':
	self.set_admin_state('down')

	self.set_interface('mac', mac)

	# Turn an interface to the 'up' state if it was changed to 'down' by this fucntion
	if prev_state == 'up':
	self.set_admin_state('up')

	def set_vrf(self, vrf):
	"""
	Add/Remove interface from given VRF instance.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').set_vrf('foo')
	>>> Interface('eth0').set_vrf()
	"""

	tmp = self.get_interface('vrf')
	if tmp == vrf:
	return None

	self.set_interface('vrf', vrf)
	self._set_vrf_ct_zone(vrf)

	def set_arp_cache_tmo(self, tmo):
	"""
	Set ARP cache timeout value in seconds. Internal Kernel representation
	is in milliseconds.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').set_arp_cache_tmo(40)
	"""
	tmo = str(int(tmo) * 1000)
	tmp = self.get_interface('arp_cache_tmo')
	if tmp == tmo:
	return None
	return self.set_interface('arp_cache_tmo', tmo)

	def set_tcp_ipv4_mss(self, mss):
	"""
	Set IPv4 TCP MSS value advertised when TCP SYN packets leave this
	interface. Value is in bytes.

	A value of 0 will disable the MSS adjustment

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').set_tcp_ipv4_mss(1340)
	"""
	iptables_bin = 'iptables'
	base_options = f'-A FORWARD -o {self.ifname} -p tcp -m tcp --tcp-flags SYN,RST SYN'
	out = self._cmd(f'{iptables_bin}-save -t mangle')
	for line in out.splitlines():
	if line.startswith(base_options):
	# remove OLD MSS mangling configuration
	line = line.replace('-A FORWARD', '-D FORWARD')
	self._cmd(f'{iptables_bin} -t mangle {line}')

	cmd_mss = f'{iptables_bin} -t mangle {base_options} --jump TCPMSS'
	if mss == 'clamp-mss-to-pmtu':
	self._cmd(f'{cmd_mss} --clamp-mss-to-pmtu')
	elif int(mss) > 0:
	# probably add option to clamp only if bigger:
	low_mss = str(int(mss) + 1)
	self._cmd(f'{cmd_mss} -m tcpmss --mss {low_mss}:65535 --set-mss {mss}')

	def set_tcp_ipv6_mss(self, mss):
	"""
	Set IPv6 TCP MSS value advertised when TCP SYN packets leave this
	interface. Value is in bytes.

	A value of 0 will disable the MSS adjustment

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').set_tcp_mss(1320)
	"""
	iptables_bin = 'ip6tables'
	base_options = f'-A FORWARD -o {self.ifname} -p tcp -m tcp --tcp-flags SYN,RST SYN'
	out = self._cmd(f'{iptables_bin}-save -t mangle')
	for line in out.splitlines():
	if line.startswith(base_options):
	# remove OLD MSS mangling configuration
	line = line.replace('-A FORWARD', '-D FORWARD')
	self._cmd(f'{iptables_bin} -t mangle {line}')

	cmd_mss = f'{iptables_bin} -t mangle {base_options} --jump TCPMSS'
	if mss == 'clamp-mss-to-pmtu':
	self._cmd(f'{cmd_mss} --clamp-mss-to-pmtu')
	elif int(mss) > 0:
	# probably add option to clamp only if bigger:
	low_mss = str(int(mss) + 1)
	self._cmd(f'{cmd_mss} -m tcpmss --mss {low_mss}:65535 --set-mss {mss}')

	def set_arp_filter(self, arp_filter):
	"""
	Filter ARP requests

	1 - Allows you to have multiple network interfaces on the same
	subnet, and have the ARPs for each interface be answered
	based on whether or not the kernel would route a packet from
	the ARP'd IP out that interface (therefore you must use source
	based routing for this to work). In other words it allows control
	of which cards (usually 1) will respond to an arp request.

	0 - (default) The kernel can respond to arp requests with addresses
	from other interfaces. This may seem wrong but it usually makes
	sense, because it increases the chance of successful communication.
	IP addresses are owned by the complete host on Linux, not by
	particular interfaces. Only for more complex setups like load-
	balancing, does this behaviour cause problems.
	"""
	tmp = self.get_interface('arp_filter')
	if tmp == arp_filter:
	return None
	return self.set_interface('arp_filter', arp_filter)

	def set_arp_accept(self, arp_accept):
	"""
	Define behavior for gratuitous ARP frames who's IP is not
	already present in the ARP table:
	0 - don't create new entries in the ARP table
	1 - create new entries in the ARP table

	Both replies and requests type gratuitous arp will trigger the
	ARP table to be updated, if this setting is on.

	If the ARP table already contains the IP address of the
	gratuitous arp frame, the arp table will be updated regardless
	if this setting is on or off.
	"""
	tmp = self.get_interface('arp_accept')
	if tmp == arp_accept:
	return None
	return self.set_interface('arp_accept', arp_accept)

	def set_arp_announce(self, arp_announce):
	"""
	Define different restriction levels for announcing the local
	source IP address from IP packets in ARP requests sent on
	interface:
	0 - (default) Use any local address, configured on any interface
	1 - Try to avoid local addresses that are not in the target's
	subnet for this interface. This mode is useful when target
	hosts reachable via this interface require the source IP
	address in ARP requests to be part of their logical network
	configured on the receiving interface. When we generate the
	request we will check all our subnets that include the
	target IP and will preserve the source address if it is from
	such subnet.

	Increasing the restriction level gives more chance for
	receiving answer from the resolved target while decreasing
	the level announces more valid sender's information.
	"""
	tmp = self.get_interface('arp_announce')
	if tmp == arp_announce:
	return None
	return self.set_interface('arp_announce', arp_announce)

	def set_arp_ignore(self, arp_ignore):
	"""
	Define different modes for sending replies in response to received ARP
	requests that resolve local target IP addresses:

	0 - (default): reply for any local target IP address, configured
	on any interface
	1 - reply only if the target IP address is local address
	configured on the incoming interface
	"""
	tmp = self.get_interface('arp_ignore')
	if tmp == arp_ignore:
	return None
	return self.set_interface('arp_ignore', arp_ignore)

	def set_ipv4_forwarding(self, forwarding):
	""" Configure IPv4 forwarding. """
	tmp = self.get_interface('ipv4_forwarding')
	if tmp == forwarding:
	return None
	return self.set_interface('ipv4_forwarding', forwarding)

	def set_ipv4_source_validation(self, value):
	"""
	Help prevent attacks used by Spoofing IP Addresses. Reverse path
	filtering is a Kernel feature that, when enabled, is designed to ensure
	packets that are not routable to be dropped. The easiest example of this
	would be and IP Address of the range 10.0.0.0/8, a private IP Address,
	being received on the Internet facing interface of the router.

	As per RFC3074.
	"""
	if value == 'strict':
	value = 1
	elif value == 'loose':
	value = 2
	else:
	value = 0

	all_rp_filter = int(read_file('/proc/sys/net/ipv4/conf/all/rp_filter'))
	if all_rp_filter > value:
	global_setting = 'disable'
	if all_rp_filter == 1: global_setting = 'strict'
	elif all_rp_filter == 2: global_setting = 'loose'

	print(f'WARNING: Global source-validation is set to "{global_setting}\n"' \
	'this overrides per interface setting!')

	tmp = self.get_interface('rp_filter')
	if int(tmp) == value:
	return None
	return self.set_interface('rp_filter', value)

	def set_ipv6_accept_ra(self, accept_ra):
	"""
	Accept Router Advertisements; autoconfigure using them.

	It also determines whether or not to transmit Router Solicitations.
	If and only if the functional setting is to accept Router
	Advertisements, Router Solicitations will be transmitted.

	0 - Do not accept Router Advertisements.
	1 - (default) Accept Router Advertisements if forwarding is disabled.
	2 - Overrule forwarding behaviour. Accept Router Advertisements even if
	forwarding is enabled.
	"""
	tmp = self.get_interface('ipv6_accept_ra')
	if tmp == accept_ra:
	return None
	return self.set_interface('ipv6_accept_ra', accept_ra)

	def set_ipv6_autoconf(self, autoconf):
	"""
	Autoconfigure addresses using Prefix Information in Router
	Advertisements.
	"""
	tmp = self.get_interface('ipv6_autoconf')
	if tmp == autoconf:
	return None
	return self.set_interface('ipv6_autoconf', autoconf)

	def add_ipv6_eui64_address(self, prefix):
	"""
	Extended Unique Identifier (EUI), as per RFC2373, allows a host to
	assign itself a unique IPv6 address based on a given IPv6 prefix.

	Calculate the EUI64 from the interface's MAC, then assign it
	with the given prefix to the interface.
	"""
	# T2863: only add a link-local IPv6 address if the interface returns
	# a MAC address. This is not the case on e.g. WireGuard interfaces.
	mac = self.get_mac()
	if mac:
	eui64 = mac2eui64(mac, prefix)
	prefixlen = prefix.split('/')[1]
	self.add_addr(f'{eui64}/{prefixlen}')

	def del_ipv6_eui64_address(self, prefix):
	"""
	Delete the address based on the interface's MAC-based EUI64
	combined with the prefix address.
	"""
	if is_ipv6(prefix):
	eui64 = mac2eui64(self.get_mac(), prefix)
	prefixlen = prefix.split('/')[1]
	self.del_addr(f'{eui64}/{prefixlen}')

	def set_ipv6_forwarding(self, forwarding):
	"""
	Configure IPv6 interface-specific Host/Router behaviour.

	False:

	By default, Host behaviour is assumed. This means:

	1. IsRouter flag is not set in Neighbour Advertisements.
	2. If accept_ra is TRUE (default), transmit Router
	Solicitations.
	3. If accept_ra is TRUE (default), accept Router
	Advertisements (and do autoconfiguration).
	4. If accept_redirects is TRUE (default), accept Redirects.

	True:

	If local forwarding is enabled, Router behaviour is assumed.
	This means exactly the reverse from the above:

	1. IsRouter flag is set in Neighbour Advertisements.
	2. Router Solicitations are not sent unless accept_ra is 2.
	3. Router Advertisements are ignored unless accept_ra is 2.
	4. Redirects are ignored.
	"""
	tmp = self.get_interface('ipv6_forwarding')
	if tmp == forwarding:
	return None
	return self.set_interface('ipv6_forwarding', forwarding)

	def set_ipv6_dad_messages(self, dad):
	"""
	The amount of Duplicate Address Detection probes to send.
	Default: 1
	"""
	tmp = self.get_interface('ipv6_dad_transmits')
	if tmp == dad:
	return None
	return self.set_interface('ipv6_dad_transmits', dad)

	def set_link_detect(self, link_filter):
	"""
	Configure kernel response in packets received on interfaces that are 'down'

	0 - Allow packets to be received for the address on this interface
	even if interface is disabled or no carrier.

	1 - Ignore packets received if interface associated with the incoming
	address is down.

	2 - Ignore packets received if interface associated with the incoming
	address is down or has no carrier.

	Default value is 0. Note that some distributions enable it in startup
	scripts.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').set_link_detect(1)
	"""
	tmp = self.get_interface('link_detect')
	if tmp == link_filter:
	return None
	return self.set_interface('link_detect', link_filter)

	def get_alias(self):
	"""
	Get interface alias name used by e.g. SNMP

	Example:
	>>> Interface('eth0').get_alias()
	'interface description as set by user'
	"""
	return self.get_interface('alias')

	def set_alias(self, ifalias=''):
	"""
	Set interface alias name used by e.g. SNMP

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').set_alias('VyOS upstream interface')

	to clear alias e.g. delete it use:

	>>> Interface('eth0').set_ifalias('')
	"""
	tmp = self.get_interface('alias')
	if tmp == ifalias:
	return None
	self.set_interface('alias', ifalias)

	def get_admin_state(self):
	"""
	Get interface administrative state. Function will return 'up' or 'down'

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').get_admin_state()
	'up'
	"""
	return self.get_interface('admin_state')

	def set_admin_state(self, state):
	"""
	Set interface administrative state to be 'up' or 'down'

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').set_admin_state('down')
	>>> Interface('eth0').get_admin_state()
	'down'
	"""
	if state == 'up':
	self._admin_state_down_cnt -= 1
	if self._admin_state_down_cnt < 1:
	return self.set_interface('admin_state', state)
	else:
	self._admin_state_down_cnt += 1
	return self.set_interface('admin_state', state)

	def set_path_cost(self, cost):
	"""
	Set interface path cost, only relevant for STP enabled interfaces

	Example:

	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').set_path_cost(4)
	"""
	self.set_interface('path_cost', cost)

	def set_path_priority(self, priority):
	"""
	Set interface path priority, only relevant for STP enabled interfaces

	Example:

	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').set_path_priority(4)
	"""
	self.set_interface('path_priority', priority)

	def set_port_isolation(self, on_or_off):
	"""
	Controls whether a given port will be isolated, which means it will be
	able to communicate with non-isolated ports only. By default this flag
	is off.

	Use enable=1 to enable or enable=0 to disable

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth1').set_port_isolation('on')
	"""
	self.set_interface('bridge_port_isolation', on_or_off)

	def set_proxy_arp(self, enable):
	"""
	Set per interface proxy ARP configuration

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').set_proxy_arp(1)
	"""
	tmp = self.get_interface('proxy_arp')
	if tmp == enable:
	return None
	self.set_interface('proxy_arp', enable)

	def set_proxy_arp_pvlan(self, enable):
	"""
	Private VLAN proxy arp.
	Basically allow proxy arp replies back to the same interface
	(from which the ARP request/solicitation was received).

	This is done to support (ethernet) switch features, like RFC
	3069, where the individual ports are NOT allowed to
	communicate with each other, but they are allowed to talk to
	the upstream router. As described in RFC 3069, it is possible
	to allow these hosts to communicate through the upstream
	router by proxy_arp'ing. Don't need to be used together with
	proxy_arp.

	This technology is known by different names:
	In RFC 3069 it is called VLAN Aggregation.
	Cisco and Allied Telesyn call it Private VLAN.
	Hewlett-Packard call it Source-Port filtering or port-isolation.
	Ericsson call it MAC-Forced Forwarding (RFC Draft).

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').set_proxy_arp_pvlan(1)
	"""
	tmp = self.get_interface('proxy_arp_pvlan')
	if tmp == enable:
	return None
	self.set_interface('proxy_arp_pvlan', enable)

	def get_addr_v4(self):
	"""
	Retrieve assigned IPv4 addresses from given interface.
	This is done using the netifaces and ipaddress python modules.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').get_addr_v4()
	['172.16.33.30/24']
	"""
	ipv4 = []
	if AF_INET in ifaddresses(self.config['ifname']):
	for v4_addr in ifaddresses(self.config['ifname'])[AF_INET]:
	# we need to manually assemble a list of IPv4 address/prefix
	prefix = '/' + \
	str(IPv4Network('0.0.0.0/' + v4_addr['netmask']).prefixlen)
	ipv4.append(v4_addr['addr'] + prefix)
	return ipv4

	def get_addr_v6(self):
	"""
	Retrieve assigned IPv6 addresses from given interface.
	This is done using the netifaces and ipaddress python modules.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').get_addr_v6()
	['fe80::20c:29ff:fe11:a174/64']
	"""
	ipv6 = []
	if AF_INET6 in ifaddresses(self.config['ifname']):
	for v6_addr in ifaddresses(self.config['ifname'])[AF_INET6]:
	# Note that currently expanded netmasks are not supported. That means
	# 2001:db00::0/24 is a valid argument while 2001:db00::0/ffff:ff00:: not.
	# see https://docs.python.org/3/library/ipaddress.html
	prefix = '/' + v6_addr['netmask'].split('/')[-1]

	# we alsoneed to remove the interface suffix on link local
	# addresses
	v6_addr['addr'] = v6_addr['addr'].split('%')[0]
	ipv6.append(v6_addr['addr'] + prefix)
	return ipv6

	def get_addr(self):
	"""
	Retrieve assigned IPv4 and IPv6 addresses from given interface.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').get_addr()
	['172.16.33.30/24', 'fe80::20c:29ff:fe11:a174/64']
	"""
	return self.get_addr_v4() + self.get_addr_v6()

	def add_addr(self, addr):
	"""
	Add IP(v6) address to interface. Address is only added if it is not
	already assigned to that interface. Address format must be validated
	and compressed/normalized before calling this function.

	addr: can be an IPv4 address, IPv6 address, dhcp or dhcpv6!
	IPv4: add IPv4 address to interface
	IPv6: add IPv6 address to interface
	dhcp: start dhclient (IPv4) on interface
	dhcpv6: start WIDE DHCPv6 (IPv6) on interface

	Returns False if address is already assigned and wasn't re-added.
	Example:
	>>> from vyos.ifconfig import Interface
	>>> j = Interface('eth0')
	>>> j.add_addr('192.0.2.1/24')
	>>> j.add_addr('2001:db8::ffff/64')
	>>> j.get_addr()
	['192.0.2.1/24', '2001:db8::ffff/64']
	"""
	# XXX: normalize/compress with ipaddress if calling functions don't?
	# is subnet mask always passed, and in the same way?

	# do not add same address twice
	if addr in self._addr:
	return False

	addr_is_v4 = is_ipv4(addr)

	# we can't have both DHCP and static IPv4 addresses assigned
	for a in self._addr:
	if ( ( addr == 'dhcp' and a != 'dhcpv6' and is_ipv4(a) ) or
	( a == 'dhcp' and addr != 'dhcpv6' and addr_is_v4 ) ):
	raise ConfigError((
	"Can't configure both static IPv4 and DHCP address "
	"on the same interface"))

	# add to interface
	if addr == 'dhcp':
	self.set_dhcp(True)
	elif addr == 'dhcpv6':
	self.set_dhcpv6(True)
	elif not is_intf_addr_assigned(self.ifname, addr):
	self._cmd(f'ip addr add "{addr}" '
	f'{"brd + " if addr_is_v4 else ""}dev "{self.ifname}"')
	else:
	return False

	# add to cache
	self._addr.append(addr)

	return True

	def del_addr(self, addr):
	"""
	Delete IP(v6) address from interface. Address is only deleted if it is
	assigned to that interface. Address format must be exactly the same as
	was used when adding the address.

	addr: can be an IPv4 address, IPv6 address, dhcp or dhcpv6!
	IPv4: delete IPv4 address from interface
	IPv6: delete IPv6 address from interface
	dhcp: stop dhclient (IPv4) on interface
	dhcpv6: stop dhclient (IPv6) on interface

	Returns False if address isn't already assigned and wasn't deleted.
	Example:
	>>> from vyos.ifconfig import Interface
	>>> j = Interface('eth0')
	>>> j.add_addr('2001:db8::ffff/64')
	>>> j.add_addr('192.0.2.1/24')
	>>> j.get_addr()
	['192.0.2.1/24', '2001:db8::ffff/64']
	>>> j.del_addr('192.0.2.1/24')
	>>> j.get_addr()
	['2001:db8::ffff/64']
	"""
	if not addr:
	raise ValueError()

	# remove from interface
	if addr == 'dhcp':
	self.set_dhcp(False)
	elif addr == 'dhcpv6':
	self.set_dhcpv6(False)
	elif is_intf_addr_assigned(self.ifname, addr):
	self._cmd(f'ip addr del "{addr}" dev "{self.ifname}"')
	else:
	return False

	# remove from cache
	if addr in self._addr:
	self._addr.remove(addr)

	return True

	def flush_addrs(self):
	"""
	Flush all addresses from an interface, including DHCP.

	Will raise an exception on error.
	"""
	# stop DHCP(v6) if running
	self.set_dhcp(False)
	self.set_dhcpv6(False)

	# flush all addresses
	self._cmd(f'ip addr flush dev "{self.ifname}"')

	def add_to_bridge(self, bridge_dict):
	"""
	Adds the interface to the bridge with the passed port config.

	Returns False if bridge doesn't exist.
	"""

	# drop all interface addresses first
	self.flush_addrs()

	ifname = self.ifname

	for bridge, bridge_config in bridge_dict.items():
	# add interface to bridge - use Section.klass to get BridgeIf class
	Section.klass(bridge)(bridge, create=True).add_port(self.ifname)

	# set bridge port path cost
	if 'cost' in bridge_config:
	self.set_path_cost(bridge_config['cost'])

	# set bridge port path priority
	if 'priority' in bridge_config:
	self.set_path_cost(bridge_config['priority'])

	bridge_vlan_filter = Section.klass(bridge)(bridge, create=True).get_vlan_filter()

	if int(bridge_vlan_filter):
	cur_vlan_ids = get_vlan_ids(ifname)
	add_vlan = []
	native_vlan_id = None
	allowed_vlan_ids= []

	if 'native_vlan' in bridge_config:
	vlan_id = bridge_config['native_vlan']
	add_vlan.append(vlan_id)
	native_vlan_id = vlan_id

	if 'allowed_vlan' in bridge_config:
	for vlan in bridge_config['allowed_vlan']:
	vlan_range = vlan.split('-')
	if len(vlan_range) == 2:
	for vlan_add in range(int(vlan_range[0]),int(vlan_range[1]) + 1):
	add_vlan.append(str(vlan_add))
	allowed_vlan_ids.append(str(vlan_add))
	else:
	add_vlan.append(vlan)
	allowed_vlan_ids.append(vlan)

	# Remove redundant VLANs from the system
	for vlan in list_diff(cur_vlan_ids, add_vlan):
	cmd = f'bridge vlan del dev {ifname} vid {vlan} master'
	self._cmd(cmd)

	for vlan in allowed_vlan_ids:
	cmd = f'bridge vlan add dev {ifname} vid {vlan} master'
	self._cmd(cmd)
	# Setting native VLAN to system
	if native_vlan_id:
	cmd = f'bridge vlan add dev {ifname} vid {native_vlan_id} pvid untagged master'
	self._cmd(cmd)

	def set_dhcp(self, enable):
	"""
	Enable/Disable DHCP client on a given interface.
	"""
	if enable not in [True, False]:
	raise ValueError()

	ifname = self.ifname
	config_base = r'/var/lib/dhcp/dhclient'
	config_file = f'{config_base}_{ifname}.conf'
	options_file = f'{config_base}_{ifname}.options'
	pid_file = f'{config_base}_{ifname}.pid'
	lease_file = f'{config_base}_{ifname}.leases'

	# Stop client with old config files to get the right IF_METRIC.
	systemd_service = f'dhclient@{ifname}.service'
	if is_systemd_service_active(systemd_service):
	self._cmd(f'systemctl stop {systemd_service}')

	if enable and 'disable' not in self._config:
	if dict_search('dhcp_options.host_name', self._config) == None:
	# read configured system hostname.
	# maybe change to vyos hostd client ???
	hostname = 'vyos'
	with open('/etc/hostname', 'r') as f:
	hostname = f.read().rstrip('\n')
	tmp = {'dhcp_options' : { 'host_name' : hostname}}
	self._config = dict_merge(tmp, self._config)

	render(options_file, 'dhcp-client/daemon-options.tmpl',
	self._config)
	render(config_file, 'dhcp-client/ipv4.tmpl',
	self._config)

	# 'up' check is mandatory b/c even if the interface is A/D, as soon as
	# the DHCP client is started the interface will be placed in u/u state.
	# This is not what we intended to do when disabling an interface.
	return self._cmd(f'systemctl restart {systemd_service}')
	else:
	# cleanup old config files
	for file in [config_file, options_file, pid_file, lease_file]:
	if os.path.isfile(file):
	os.remove(file)


	def set_dhcpv6(self, enable):
	"""
	Enable/Disable DHCPv6 client on a given interface.
	"""
	if enable not in [True, False]:
	raise ValueError()

	ifname = self.ifname
	config_file = f'/run/dhcp6c/dhcp6c.{ifname}.conf'
	systemd_service = f'dhcp6c@{ifname}.service'

	if enable and 'disable' not in self._config:
	render(config_file, 'dhcp-client/ipv6.tmpl',
	self._config)

	# We must ignore any return codes. This is required to enable
	# DHCPv6-PD for interfaces which are yet not up and running.
	return self._popen(f'systemctl restart {systemd_service}')
	else:
	if is_systemd_service_active(systemd_service):
	self._cmd(f'systemctl stop {systemd_service}')
	if os.path.isfile(config_file):
	os.remove(config_file)

	def set_mirror(self):
	# Please refer to the document for details
	# - https://man7.org/linux/man-pages/man8/tc.8.html
	# - https://man7.org/linux/man-pages/man8/tc-mirred.8.html
	# Depening if we are the source or the target interface of the port
	# mirror we need to setup some variables.
	source_if = self._config['ifname']
	config = self._config.get('mirror', None)

	if 'is_mirror_intf' in self._config:
	source_if = next(iter(self._config['is_mirror_intf']))
	config = self._config['is_mirror_intf'][source_if].get('mirror', None)

	# Check configuration stored by old perl code before delete T3782
	if not 'redirect' in self._config:
	# Please do not clear the 'set $? = 0 '. It's meant to force a return of 0
	# Remove existing mirroring rules
	delete_tc_cmd = f'tc qdisc del dev {source_if} handle ffff: ingress 2> /dev/null;'
	delete_tc_cmd += f'tc qdisc del dev {source_if} handle 1: root prio 2> /dev/null;'
	delete_tc_cmd += 'set $?=0'
	self._popen(delete_tc_cmd)

	# Bail out early if nothing needs to be configured
	if not config:
	return

	for direction, mirror_if in config.items():
	if mirror_if not in interfaces():
	continue

	if direction == 'ingress':
	handle = 'ffff: ingress'
	parent = 'ffff:'
	elif direction == 'egress':
	handle = '1: root prio'
	parent = '1:'

	# Mirror egress traffic
	mirror_cmd = f'tc qdisc add dev {source_if} handle {handle}; '
	# Export the mirrored traffic to the interface
	mirror_cmd += f'tc filter add dev {source_if} parent {parent} protocol all prio 10 u32 match u32 0 0 flowid 1:1 action mirred egress mirror dev {mirror_if}'
	self._popen(mirror_cmd)

	def set_xdp(self, state):
	"""
	Enable Kernel XDP support. State can be either True or False.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> i = Interface('eth0')
	>>> i.set_xdp(True)
	"""
	if not isinstance(state, bool):
	raise ValueError("Value out of range")

	# https://phabricator.vyos.net/T3448 - there is (yet) no RPI support for XDP
	if not os.path.exists('/usr/sbin/xdp_loader'):
	return

	ifname = self.config['ifname']
	cmd = f'xdp_loader -d {ifname} -U --auto-mode'
	if state:
	# Using 'xdp' will automatically decide if the driver supports
	# 'xdpdrv' or only 'xdpgeneric'. A user later sees which driver is
	# actually in use by calling 'ip a' or 'show interfaces ethernet'
	cmd = f'xdp_loader -d {ifname} --auto-mode -F --progsec xdp_router ' \
	f'--filename /usr/share/vyos/xdp/xdp_prog_kern.o && ' \
	f'xdp_prog_user -d {ifname}'

	return self._cmd(cmd)

	def update(self, config):
	""" General helper function which works on a dictionary retrived by
	get_config_dict(). It's main intention is to consolidate the scattered
	interface setup code and provide a single point of entry when workin
	on any interface. """

	if self.debug:
	import pprint
	pprint.pprint(config)

	# Cache the configuration - it will be reused inside e.g. DHCP handler
	# XXX: maybe pass the option via __init__ in the future and rename this
	# method to apply()?
	self._config = config

	# Change interface MAC address - re-set to real hardware address (hw-id)
	# if custom mac is removed. Skip if bond member.
	if 'is_bond_member' not in config:
	mac = config.get('hw_id')
	if 'mac' in config:
	mac = config.get('mac')
	if mac:
	self.set_mac(mac)

	# Update interface description
	self.set_alias(config.get('description', ''))

	# Ignore link state changes
	value = '2' if 'disable_link_detect' in config else '1'
	self.set_link_detect(value)

	# Configure assigned interface IP addresses. No longer
	# configured addresses will be removed first
	new_addr = config.get('address', [])

	# always ensure DHCP client is stopped (when not configured explicitly)
	if 'dhcp' not in new_addr:
	self.del_addr('dhcp')

	# always ensure DHCPv6 client is stopped (when not configured as client
	# for IPv6 address or prefix delegation)
	dhcpv6pd = dict_search('dhcpv6_options.pd', config)
	dhcpv6pd = dhcpv6pd != None and len(dhcpv6pd) != 0
	if 'dhcpv6' not in new_addr and not dhcpv6pd:
	self.del_addr('dhcpv6')

	# determine IP addresses which are assigned to the interface and build a
	# list of addresses which are no longer in the dict so they can be removed
	if 'address_old' in config:
	for addr in list_diff(config['address_old'], new_addr):
	# we will delete all interface specific IP addresses if they are not
	# explicitly configured on the CLI
	if is_ipv6_link_local(addr):
	eui64 = mac2eui64(self.get_mac(), 'fe80::/64')
	if addr != f'{eui64}/64':
	self.del_addr(addr)
	else:
	self.del_addr(addr)

	for addr in new_addr:
	self.add_addr(addr)

	# start DHCPv6 client when only PD was configured
	if dhcpv6pd:
	self.set_dhcpv6(True)

	# There are some items in the configuration which can only be applied
	# if this instance is not bound to a bridge. This should be checked
	# by the caller but better save then sorry!
	if not any(k in ['is_bond_member', 'is_bridge_member'] for k in config):
	# Bind interface to given VRF or unbind it if vrf node is not set.
	# unbinding will call 'ip link set dev eth0 nomaster' which will
	# also drop the interface out of a bridge or bond - thus this is
	# checked before
	self.set_vrf(config.get('vrf', ''))

	# Configure MSS value for IPv4 TCP connections
	tmp = dict_search('ip.adjust_mss', config)
	value = tmp if (tmp != None) else '0'
	self.set_tcp_ipv4_mss(value)

	# Configure MSS value for IPv6 TCP connections
	tmp = dict_search('ipv6.adjust_mss', config)
	value = tmp if (tmp != None) else '0'
	self.set_tcp_ipv6_mss(value)

	# Configure ARP cache timeout in milliseconds - has default value
	tmp = dict_search('ip.arp_cache_timeout', config)
	value = tmp if (tmp != None) else '30'
	self.set_arp_cache_tmo(value)

	# Configure ARP filter configuration
	tmp = dict_search('ip.disable_arp_filter', config)
	value = '0' if (tmp != None) else '1'
	self.set_arp_filter(value)

	# Configure ARP accept
	tmp = dict_search('ip.enable_arp_accept', config)
	value = '1' if (tmp != None) else '0'
	self.set_arp_accept(value)

	# Configure ARP announce
	tmp = dict_search('ip.enable_arp_announce', config)
	value = '1' if (tmp != None) else '0'
	self.set_arp_announce(value)

	# Configure ARP ignore
	tmp = dict_search('ip.enable_arp_ignore', config)
	value = '1' if (tmp != None) else '0'
	self.set_arp_ignore(value)

	# Enable proxy-arp on this interface
	tmp = dict_search('ip.enable_proxy_arp', config)
	value = '1' if (tmp != None) else '0'
	self.set_proxy_arp(value)

	# Enable private VLAN proxy ARP on this interface
	tmp = dict_search('ip.proxy_arp_pvlan', config)
	value = '1' if (tmp != None) else '0'
	self.set_proxy_arp_pvlan(value)

	# IPv4 forwarding
	tmp = dict_search('ip.disable_forwarding', config)
	value = '0' if (tmp != None) else '1'
	self.set_ipv4_forwarding(value)

	# IPv4 source-validation
	tmp = dict_search('ip.source_validation', config)
	value = tmp if (tmp != None) else '0'
	self.set_ipv4_source_validation(value)

	# IPv6 forwarding
	tmp = dict_search('ipv6.disable_forwarding', config)
	value = '0' if (tmp != None) else '1'
	self.set_ipv6_forwarding(value)

	# IPv6 router advertisements
	tmp = dict_search('ipv6.address.autoconf', config)
	value = '2' if (tmp != None) else '1'
	if 'dhcpv6' in new_addr:
	value = '2'
	self.set_ipv6_accept_ra(value)

	# IPv6 address autoconfiguration
	tmp = dict_search('ipv6.address.autoconf', config)
	value = '1' if (tmp != None) else '0'
	self.set_ipv6_autoconf(value)

	# IPv6 Duplicate Address Detection (DAD) tries
	tmp = dict_search('ipv6.dup_addr_detect_transmits', config)
	value = tmp if (tmp != None) else '1'
	self.set_ipv6_dad_messages(value)

	# MTU - Maximum Transfer Unit
	if 'mtu' in config:
	self.set_mtu(config.get('mtu'))

	# Delete old IPv6 EUI64 addresses before changing MAC
	for addr in (dict_search('ipv6.address.eui64_old', config) or []):
	self.del_ipv6_eui64_address(addr)

	# Manage IPv6 link-local addresses
	if dict_search('ipv6.address.no_default_link_local', config) != None:
	self.del_ipv6_eui64_address('fe80::/64')
	else:
	self.add_ipv6_eui64_address('fe80::/64')

	# Add IPv6 EUI-based addresses
	tmp = dict_search('ipv6.address.eui64', config)
	if tmp:
	for addr in tmp:
	self.add_ipv6_eui64_address(addr)

	# re-add ourselves to any bridge we might have fallen out of
	if 'is_bridge_member' in config:
	bridge_dict = config.get('is_bridge_member')
	self.add_to_bridge(bridge_dict)

	# eXpress Data Path - highly experimental
	self.set_xdp('xdp' in config)

	# configure port mirror
	self.set_mirror()

	# Enable/Disable of an interface must always be done at the end of the
	# derived class to make use of the ref-counting set_admin_state()
	# function. We will only enable the interface if 'up' was called as
	# often as 'down'. This is required by some interface implementations
	# as certain parameters can only be changed when the interface is
	# in admin-down state. This ensures the link does not flap during
	# reconfiguration.
	state = 'down' if 'disable' in config else 'up'
	self.set_admin_state(state)

	# remove no longer required 802.1ad (Q-in-Q VLANs)
	ifname = config['ifname']
	for vif_s_id in config.get('vif_s_remove', {}):
	vif_s_ifname = f'{ifname}.{vif_s_id}'
	VLANIf(vif_s_ifname).remove()

	# create/update 802.1ad (Q-in-Q VLANs)
	for vif_s_id, vif_s_config in config.get('vif_s', {}).items():
	tmp = deepcopy(VLANIf.get_config())
	tmp['protocol'] = vif_s_config['protocol']
	tmp['source_interface'] = ifname
	tmp['vlan_id'] = vif_s_id

	vif_s_ifname = f'{ifname}.{vif_s_id}'
	vif_s_config['ifname'] = vif_s_ifname

	# It is not possible to change the VLAN encapsulation protocol
	# "on-the-fly". For this "quirk" we need to actively delete and
	# re-create the VIF-S interface.
	if self.exists(vif_s_ifname):
	cur_cfg = get_interface_config(vif_s_ifname)
	protocol = dict_search('linkinfo.info_data.protocol', cur_cfg).lower()
	if protocol != vif_s_config['protocol']:
	VLANIf(vif_s_ifname).remove()

	s_vlan = VLANIf(vif_s_ifname, **tmp)
	s_vlan.update(vif_s_config)

	# remove no longer required client VLAN (vif-c)
	for vif_c_id in vif_s_config.get('vif_c_remove', {}):
	vif_c_ifname = f'{vif_s_ifname}.{vif_c_id}'
	VLANIf(vif_c_ifname).remove()

	# create/update client VLAN (vif-c) interface
	for vif_c_id, vif_c_config in vif_s_config.get('vif_c', {}).items():
	tmp = deepcopy(VLANIf.get_config())
	tmp['source_interface'] = vif_s_ifname
	tmp['vlan_id'] = vif_c_id

	vif_c_ifname = f'{vif_s_ifname}.{vif_c_id}'
	vif_c_config['ifname'] = vif_c_ifname
	c_vlan = VLANIf(vif_c_ifname, **tmp)
	c_vlan.update(vif_c_config)

	# remove no longer required 802.1q VLAN interfaces
	for vif_id in config.get('vif_remove', {}):
	vif_ifname = f'{ifname}.{vif_id}'
	VLANIf(vif_ifname).remove()

	# create/update 802.1q VLAN interfaces
	for vif_id, vif_config in config.get('vif', {}).items():

	vif_ifname = f'{ifname}.{vif_id}'
	vif_config['ifname'] = vif_ifname

	tmp = deepcopy(VLANIf.get_config())
	tmp['source_interface'] = ifname
	tmp['vlan_id'] = vif_id

	# We need to ensure that the string format is consistent, and we need to exclude redundant spaces.
	sep = ' '
	if 'egress_qos' in vif_config:
	# Unwrap strings into arrays
	egress_qos_array = vif_config['egress_qos'].split()
	# The split array is spliced according to the fixed format
	tmp['egress_qos'] = sep.join(egress_qos_array)

	if 'ingress_qos' in vif_config:
	# Unwrap strings into arrays
	ingress_qos_array = vif_config['ingress_qos'].split()
	# The split array is spliced according to the fixed format
	tmp['ingress_qos'] = sep.join(ingress_qos_array)

	# Since setting the QoS control parameters in the later stage will
	# not completely delete the old settings,
	# we still need to delete the VLAN encapsulation interface in order to
	# ensure that the changed settings are effective.
	cur_cfg = get_interface_config(vif_ifname)
	qos_str = ''
	tmp2 = dict_search('linkinfo.info_data.ingress_qos', cur_cfg)
	if 'ingress_qos' in tmp and tmp2:
	for item in tmp2:
	from_key = item['from']
	to_key = item['to']
	qos_str += f'{from_key}:{to_key} '
	if qos_str != tmp['ingress_qos']:
	if self.exists(vif_ifname):
	VLANIf(vif_ifname).remove()

	qos_str = ''
	tmp2 = dict_search('linkinfo.info_data.egress_qos', cur_cfg)
	if 'egress_qos' in tmp and tmp2:
	for item in tmp2:
	from_key = item['from']
	to_key = item['to']
	qos_str += f'{from_key}:{to_key} '
	if qos_str != tmp['egress_qos']:
	if self.exists(vif_ifname):
	VLANIf(vif_ifname).remove()

	vlan = VLANIf(vif_ifname, **tmp)
	vlan.update(vif_config)


	class VLANIf(Interface):
	""" Specific class which abstracts 802.1q and 802.1ad (Q-in-Q) VLAN interfaces """
	iftype = 'vlan'

	def _create(self):
	# bail out early if interface already exists
	if self.exists(f'{self.ifname}'):
	return

	cmd = 'ip link add link {source_interface} name {ifname} type vlan id {vlan_id}'
	if 'protocol' in self.config:
	cmd += ' protocol {protocol}'
	if 'ingress_qos' in self.config:
	cmd += ' ingress-qos-map {ingress_qos}'
	if 'egress_qos' in self.config:
	cmd += ' egress-qos-map {egress_qos}'

	self._cmd(cmd.format(**self.config))

	# interface is always A/D down. It needs to be enabled explicitly
	self.set_admin_state('down')

	def set_admin_state(self, state):
	"""
	Set interface administrative state to be 'up' or 'down'

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0.10').set_admin_state('down')
	>>> Interface('eth0.10').get_admin_state()
	'down'
	"""
	# A VLAN interface can only be placed in admin up state when
	# the lower interface is up, too
	lower_interface = glob(f'/sys/class/net/{self.ifname}/lower*/flags')[0]
	with open(lower_interface, 'r') as f:
	flags = f.read()
	# If parent is not up - bail out as we can not bring up the VLAN.
	# Flags are defined in kernel source include/uapi/linux/if.h
	if not int(flags, 16) & 1:
	return None

	return super().set_admin_state(state)

	def set_mirror(self):
	return

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