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ifconfig.py
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	# Copyright 2019 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/>.

	import os
	import re
	import jinja2

	from vyos.validate import *
	from ipaddress import IPv4Network, IPv6Address
	from netifaces import ifaddresses, AF_INET, AF_INET6
	from subprocess import Popen, PIPE, STDOUT
	from time import sleep

	dhcp_cfg = """
	# generated by ifconfig.py
	option rfc3442-classless-static-routes code 121 = array of unsigned integer 8;
	interface "{{ intf }}" {
	send host-name "{{ hostname }}";
	request subnet-mask, broadcast-address, routers, domain-name-servers, rfc3442-classless-static-routes, domain-name, interface-mtu;
	}
	"""

	dhcpv6_cfg = """
	# generated by ifconfig.py
	interface "{{ intf }}" {
	request routers, domain-name-servers, domain-name;
	}
	"""

	dhclient_base = r'/var/lib/dhcp/dhclient_'


	class Interface:
	def __init__(self, ifname, type=None):
	"""
	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.

	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._ifname = str(ifname)
	self._state = 'down'

	if not os.path.exists('/sys/class/net/{}'.format(ifname)) and not type:
	raise Exception('interface "{}" not found'.format(self._ifname))

	if not os.path.exists('/sys/class/net/{}'.format(self._ifname)):
	cmd = 'ip link add dev {} type {}'.format(self._ifname, type)
	self._cmd(cmd)

	# per interface DHCP config files
	self._dhcp_cfg_file = dhclient_base + self._ifname + '.conf'
	self._dhcp_pid_file = dhclient_base + self._ifname + '.pid'
	self._dhcp_lease_file = dhclient_base + self._ifname + '.leases'

	# per interface DHCPv6 config files
	self._dhcpv6_cfg_file = dhclient_base + self._ifname + '.v6conf'
	self._dhcpv6_pid_file = dhclient_base + self._ifname + '.v6pid'
	self._dhcpv6_lease_file = dhclient_base + self._ifname + '.v6leases'

	def _debug_msg(self, msg):
	if os.path.isfile('/tmp/vyos.ifconfig.debug'):
	print('DEBUG/{:<6} {}'.format(self._ifname, msg))

	def _cmd(self, command):
	p = Popen(command, stdout=PIPE, stderr=STDOUT, shell=True)
	tmp = p.communicate()[0].strip()
	self._debug_msg("cmd '{}'".format(command))
	if tmp.decode():
	self._debug_msg("returned:\n{}".format(tmp.decode()))

	# do we need some error checking code here?
	return tmp

	def _read_sysfs(self, filename):
	"""
	Provide a single primitive w/ error checking for reading from sysfs.
	"""
	value = None
	with open(filename, 'r') as f:
	value = f.read().rstrip('\n')

	self._debug_msg("read '{}' < '{}'".format(value, filename))
	return value

	def _write_sysfs(self, filename, value):
	"""
	Provide a single primitive w/ error checking for writing to sysfs.
	"""
	self._debug_msg("write '{}' > '{}'".format(value, filename))
	with open(filename, 'w') as f:
	f.write(str(value))

	return None

	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()
	"""
	# stop DHCP(v6) if running
	self._del_dhcp()
	self._del_dhcpv6()

	# 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
	for addr in self.get_addr():
	self.del_addr(addr)

	# Ethernet interfaces can not be removed
	if type(self) == type(EthernetIf(self._ifname)):
	return

	# 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 {}'.format(self._ifname)
	self._cmd(cmd)

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

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').get_mtu()
	'1500'
	"""
	return self._read_sysfs('/sys/class/net/{}/mtu'
	.format(self._ifname))

	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'
	"""
	if mtu < 68 or mtu > 9000:
	raise ValueError('Invalid MTU size: "{}"'.format(mru))

	return self._write_sysfs('/sys/class/net/{}/mtu'
	.format(self._ifname), mtu)

	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')
	"""
	# on interface removal (ethernet) an empty string is passed - ignore it
	if not mac:
	return None

	# a mac address consits out of 6 octets
	octets = len(mac.split(':'))
	if octets != 6:
	raise ValueError('wrong number of MAC octets: {} '.format(octets))

	# validate against the first mac address byte if it's a multicast
	# address
	if int(mac.split(':')[0], 16) & 1:
	raise ValueError('{} is a multicast MAC address'.format(mac))

	# overall mac address is not allowed to be 00:00:00:00:00:00
	if sum(int(i, 16) for i in mac.split(':')) == 0:
	raise ValueError('00:00:00:00:00:00 is not a valid MAC address')

	# check for VRRP mac address
	if mac.split(':')[0] == '0' and addr.split(':')[1] == '0' and mac.split(':')[2] == '94' and mac.split(':')[3] == '0' and mac.split(':')[4] == '1':
	raise ValueError('{} is a VRRP MAC address'.format(mac))

	# Assemble command executed on system. Unfortunately there is no way
	# of altering the MAC address via sysfs
	cmd = 'ip link set dev {} address {}'.format(self._ifname, mac)
	self._cmd(cmd)

	@property
	def arp_cache_tmo(self):
	"""
	Get configured ARP cache timeout value from interface in seconds.
	Internal Kernel representation is in milliseconds.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').arp_cache_tmo
	'30'
	"""
	return (self._read_sysfs('/proc/sys/net/ipv4/neigh/{0}/base_reachable_time_ms'
	.format(self._ifname)) / 1000)

	@arp_cache_tmo.setter
	def 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').arp_cache_tmo = '40'
	"""
	return self._write_sysfs('/proc/sys/net/ipv4/neigh/{0}/base_reachable_time_ms'
	.format(self._ifname), (int(tmo) * 1000))

	@property
	def link_detect(self):
	"""
	How does the kernel act when receiving packets on 'down' interfaces

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').link_detect
	'0'
	"""
	return self._read_sysfs('/proc/sys/net/ipv4/conf/{0}/link_filter'
	.format(self._ifname))

	@link_detect.setter
	def link_detect(self, link_filter):
	"""
	Konfigure 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').link_detect = '1'
	"""
	if link_filter >= 0 and link_filter <= 2:
	return self._write_sysfs('/proc/sys/net/ipv4/conf/{0}/link_filter'
	.format(self._ifname), link_filter)
	else:
	raise ValueError("Value out of range")

	@property
	def ifalias(self):
	"""
	Get/set interface alias name

	Example:

	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').ifalias
	''
	"""
	return self._read_sysfs('/sys/class/net/{}/ifalias'
	.format(self._ifname))

	@ifalias.setter
	def ifalias(self, ifalias=None):
	"""
	Get/set interface alias name

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

	to clear interface alias e.g. delete it use:

	>>> Interface('eth0').ifalias = ''
	>>> Interface('eth0').ifalias
	''
	"""
	if not ifalias:
	# clear interface alias
	ifalias = '\0'

	self._write_sysfs('/sys/class/net/{}/ifalias'
	.format(self._ifname), ifalias)

	@property
	def state(self):
	"""
	Enable (up) / Disable (down) an interface

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').state
	'up'
	"""
	return self._read_sysfs('/sys/class/net/{}/operstate'
	.format(self._ifname))

	@state.setter
	def state(self, state):
	"""
	Enable (up) / Disable (down) an interface

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').state = 'down'
	>>> Interface('eth0').state
	'down'
	"""
	if state not in ['up', 'down']:
	raise ValueError('state must be "up" or "down"')

	self._state = state

	# Assemble command executed on system. Unfortunately there is no way
	# to up/down an interface via sysfs
	cmd = 'ip link set dev {} {}'.format(self._ifname, state)
	self._cmd(cmd)

	@property
	def proxy_arp(self):
	"""
	Get current proxy ARP configuration from sysfs. Default: 0

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').proxy_arp
	'0'
	"""
	return self._read_sysfs('/proc/sys/net/ipv4/conf/{}/proxy_arp'
	.format(self._ifname))

	@proxy_arp.setter
	def proxy_arp(self, enable):
	"""
	Set per interface proxy ARP configuration

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').proxy_arp = 1
	>>> Interface('eth0').proxy_arp
	'1'
	"""
	if int(enable) >= 0 and int(enable) <= 1:
	return self._write_sysfs('/proc/sys/net/ipv4/conf/{}/proxy_arp'
	.format(self._ifname), enable)
	else:
	raise ValueError("Value out of range")

	@property
	def proxy_arp_pvlan(self):
	"""
	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').proxy_arp_pvlan
	'0'
	"""
	return self._read_sysfs('/proc/sys/net/ipv4/conf/{}/proxy_arp_pvlan'
	.format(self._ifname))

	@proxy_arp_pvlan.setter
	def 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').proxy_arp_pvlan = 1
	>>> Interface('eth0').proxy_arp_pvlan
	'1'
	"""
	if int(enable) >= 0 and int(enable) <= 1:
	return self._write_sysfs('/proc/sys/net/ipv4/conf/{}/proxy_arp_pvlan'
	.format(self._ifname), enable)
	else:
	raise ValueError("Value out of range")

	def get_addr(self):
	"""
	Retrieve assigned IPv4 and IPv6 addresses from given interface.
	This is done using the netifaces and ipaddress python modules.

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

	ipv4 = []
	ipv6 = []

	if AF_INET in ifaddresses(self._ifname).keys():
	for v4_addr in ifaddresses(self._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)

	if AF_INET6 in ifaddresses(self._ifname).keys():
	for v6_addr in ifaddresses(self._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
	bits = bin(
	int(v6_addr['netmask'].replace(':', ''), 16)).count('1')
	prefix = '/' + str(bits)

	# 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 ipv4 + ipv6

	def add_addr(self, addr):
	"""
	Add IP(v6) address to interface. Address is only added if it is not
	already assigned to that interface.

	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 dhclient (IPv6) on interface

	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']
	"""
	if addr == 'dhcp':
	self._set_dhcp()
	elif addr == 'dhcpv6':
	self._set_dhcpv6()
	else:
	if not is_intf_addr_assigned(self._ifname, addr):
	cmd = 'ip addr add "{}" dev "{}"'.format(addr, self._ifname)
	self._cmd(cmd)

	def del_addr(self, addr):
	"""
	Delete IP(v6) address to interface. Address is only added if it is
	assigned to that interface.

	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

	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 addr == 'dhcp':
	self._del_dhcp()
	elif addr == 'dhcpv6':
	self._del_dhcpv6()
	else:
	if is_intf_addr_assigned(self._ifname, addr):
	cmd = 'ip addr del "{}" dev "{}"'.format(addr, self._ifname)
	self._cmd(cmd)

	# replace dhcpv4/v6 with systemd.networkd?
	def _set_dhcp(self):
	"""
	Configure interface as DHCP client. The dhclient binary is automatically
	started in background!

	Example:

	>>> from vyos.ifconfig import Interface
	>>> j = Interface('eth0')
	>>> j.set_dhcp()
	"""
	dhcp = {
	'hostname': 'vyos',
	'intf': self._ifname
	}

	# read configured system hostname.
	# maybe change to vyos hostd client ???
	with open('/etc/hostname', 'r') as f:
	dhcp['hostname'] = f.read().rstrip('\n')

	# render DHCP configuration
	tmpl = jinja2.Template(dhcp_cfg)
	dhcp_text = tmpl.render(dhcp)
	with open(self._dhcp_cfg_file, 'w') as f:
	f.write(dhcp_text)

	if self._state == 'up':
	cmd = 'start-stop-daemon --start --quiet --pidfile ' + \
	self._dhcp_pid_file
	cmd += ' --exec /sbin/dhclient --'
	# now pass arguments to dhclient binary
	cmd += ' -4 -nw -cf {} -pf {} -lf {} {}'.format(
	self._dhcp_cfg_file, self._dhcp_pid_file, self._dhcp_lease_file, self._ifname)
	self._cmd(cmd)


	def _del_dhcp(self):
	"""
	De-configure interface as DHCP clinet. All auto generated files like
	pid, config and lease will be removed.

	Example:

	>>> from vyos.ifconfig import Interface
	>>> j = Interface('eth0')
	>>> j.del_dhcp()
	"""
	pid = 0
	if os.path.isfile(self._dhcp_pid_file):
	with open(self._dhcp_pid_file, 'r') as f:
	pid = int(f.read())
	else:
	self._debug_msg('No DHCP client PID found')
	return None

	# stop dhclient, we need to call dhclient and tell it should release the
	# aquired IP address. tcpdump tells me:
	# 172.16.35.103.68 > 172.16.35.254.67: [bad udp cksum 0xa0cb -> 0xb943!] BOOTP/DHCP, Request from 00:50:56:9d:11:df, length 300, xid 0x620e6946, Flags [none] (0x0000)
	# Client-IP 172.16.35.103
	# Client-Ethernet-Address 00:50:56:9d:11:df
	# Vendor-rfc1048 Extensions
	# Magic Cookie 0x63825363
	# DHCP-Message Option 53, length 1: Release
	# Server-ID Option 54, length 4: 172.16.35.254
	# Hostname Option 12, length 10: "vyos"
	#
	cmd = '/sbin/dhclient -cf {} -pf {} -lf {} -r {}'.format(
	self._dhcp_cfg_file, self._dhcp_pid_file, self._dhcp_lease_file, self._ifname)
	self._cmd(cmd)

	# cleanup old config file
	if os.path.isfile(self._dhcp_cfg_file):
	os.remove(self._dhcp_cfg_file)

	# cleanup old pid file
	if os.path.isfile(self._dhcp_pid_file):
	os.remove(self._dhcp_pid_file)

	# cleanup old lease file
	if os.path.isfile(self._dhcp_lease_file):
	os.remove(self._dhcp_lease_file)


	def _set_dhcpv6(self):
	"""
	Configure interface as DHCPv6 client. The dhclient binary is automatically
	started in background!

	Example:

	>>> from vyos.ifconfig import Interface
	>>> j = Interface('eth0')
	>>> j.set_dhcpv6()
	"""
	dhcpv6 = {
	'intf': self._ifname
	}

	# render DHCP configuration
	tmpl = jinja2.Template(dhcpv6_cfg)
	dhcpv6_text = tmpl.render(dhcpv6)
	with open(self._dhcpv6_cfg_file, 'w') as f:
	f.write(dhcpv6_text)

	if self._state == 'up':
	# https://bugs.launchpad.net/ubuntu/+source/ifupdown/+bug/1447715
	#
	# wee need to wait for IPv6 DAD to finish once and interface is added
	# this suxx :-(
	sleep(5)

	# no longer accept router announcements on this interface
	cmd = 'sysctl -q -w net.ipv6.conf.{}.accept_ra=0'.format(self._ifname)
	self._cmd(cmd)

	# assemble command-line to start DHCPv6 client (dhclient)
	cmd = 'start-stop-daemon --start --quiet --pidfile ' + \
	self._dhcpv6_pid_file
	cmd += ' --exec /sbin/dhclient --'
	# now pass arguments to dhclient binary
	cmd += ' -6 -nw -cf {} -pf {} -lf {} {}'.format(
	self._dhcpv6_cfg_file, self._dhcpv6_pid_file, self._dhcpv6_lease_file, self._ifname)
	self._cmd(cmd)


	def _del_dhcpv6(self):
	"""
	De-configure interface as DHCPv6 clinet. All auto generated files like
	pid, config and lease will be removed.

	Example:

	>>> from vyos.ifconfig import Interface
	>>> j = Interface('eth0')
	>>> j.del_dhcpv6()
	"""
	pid = 0
	if os.path.isfile(self._dhcpv6_pid_file):
	with open(self._dhcpv6_pid_file, 'r') as f:
	pid = int(f.read())
	else:
	self._debug_msg('No DHCPv6 client PID found')
	return None

	# stop dhclient
	cmd = 'start-stop-daemon --stop --quiet --pidfile {}'.format(
	self._dhcpv6_pid_file)
	self._cmd(cmd)

	# accept router announcements on this interface
	cmd = 'sysctl -q -w net.ipv6.conf.{}.accept_ra=1'.format(self._ifname)
	self._cmd(cmd)

	# cleanup old config file
	if os.path.isfile(self._dhcpv6_cfg_file):
	os.remove(self._dhcpv6_cfg_file)

	# cleanup old pid file
	if os.path.isfile(self._dhcpv6_pid_file):
	os.remove(self._dhcpv6_pid_file)

	# cleanup old lease file
	if os.path.isfile(self._dhcpv6_lease_file):
	os.remove(self._dhcpv6_lease_file)


	class LoopbackIf(Interface):

	"""
	The loopback device is a special, virtual network interface that your router
	uses to communicate with itself.
	"""

	def __init__(self, ifname):
	super().__init__(ifname, type='loopback')


	class DummyIf(Interface):

	"""
	A dummy interface is entirely virtual like, for example, the loopback
	interface. The purpose of a dummy interface is to provide a device to route
	packets through without actually transmitting them.
	"""

	def __init__(self, ifname):
	super().__init__(ifname, type='dummy')


	class BridgeIf(Interface):

	"""
	A bridge is a way to connect two Ethernet segments together in a protocol
	independent way. Packets are forwarded based on Ethernet address, rather
	than IP address (like a router). Since forwarding is done at Layer 2, all
	protocols can go transparently through a bridge.

	The Linux bridge code implements a subset of the ANSI/IEEE 802.1d standard.
	"""

	def __init__(self, ifname):
	super().__init__(ifname, type='bridge')

	@property
	def ageing_time(self):
	"""
	Return configured bridge interface MAC address aging time in seconds.
	Internal kernel representation is in centiseconds, thus its converted
	in the end. Kernel default is 300 seconds.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> BridgeIf('br0').aging_time
	'300'
	"""
	return (self._read_sysfs('/sys/class/net/{}/bridge/ageing_time'
	.format(self._ifname)) / 100)

	@ageing_time.setter
	def ageing_time(self, time):
	"""
	Set bridge interface MAC address aging time in seconds. Internal kernel
	representation is in centiseconds. Kernel default is 300 seconds.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> BridgeIf('br0').ageing_time = 2
	"""
	time = int(time) * 100
	return self._write_sysfs('/sys/class/net/{}/bridge/ageing_time'
	.format(self._ifname), time)

	@property
	def forward_delay(self):
	"""
	Get bridge forwarding delay in seconds. Internal Kernel representation
	is in centiseconds.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> BridgeIf('br0').ageing_time
	'3'
	"""
	return (self._read_sysfs('/sys/class/net/{}/bridge/forward_delay'
	.format(self._ifname)) / 100)

	@forward_delay.setter
	def forward_delay(self, time):
	"""
	Set bridge forwarding delay in seconds. Internal Kernel representation
	is in centiseconds.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> BridgeIf('br0').forward_delay = 15
	"""
	return self._write_sysfs('/sys/class/net/{}/bridge/forward_delay'
	.format(self._ifname), (int(time) * 100))

	@property
	def hello_time(self):
	"""
	Get bridge hello time in seconds. Internal Kernel representation
	is in centiseconds.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> BridgeIf('br0').hello_time
	'2'
	"""
	return (self._read_sysfs('/sys/class/net/{}/bridge/hello_time'
	.format(self._ifname)) / 100)

	@hello_time.setter
	def hello_time(self, time):
	"""
	Set bridge hello time in seconds. Internal Kernel representation
	is in centiseconds.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> BridgeIf('br0').hello_time = 2
	"""
	return self._write_sysfs('/sys/class/net/{}/bridge/hello_time'
	.format(self._ifname), (int(time) * 100))

	def set_max_age(self, time):
	"""
	Set bridge max message age in seconds. Internal Kernel representation
	is in centiseconds.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> BridgeIf('br0').set_max_age(30)
	"""
	return self._write_sysfs('/sys/class/net/{}/bridge/max_age'
	.format(self._ifname), (int(time) * 100))

	@property
	def priority(self):
	"""
	Get bridge max aging time in seconds.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> BridgeIf('br0').priority
	'32768'
	"""
	return self._read_sysfs('/sys/class/net/{}/bridge/priority'
	.format(self._ifname))

	@priority.setter
	def priority(self, priority):
	"""
	Set bridge max aging time in seconds.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> BridgeIf('br0').priority = 8192
	"""
	return self._write_sysfs('/sys/class/net/{}/bridge/priority'
	.format(self._ifname), priority)

	@property
	def stp_state(self):
	"""
	Get current bridge STP (Spanning Tree) state.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> BridgeIf('br0').stp_state
	'0'
	"""

	state = 0
	with open('/sys/class/net/{}/bridge/stp_state'.format(self._ifname), 'r') as f:
	state = int(f.read().rstrip('\n'))

	return state

	@stp_state.setter
	def stp_state(self, state):
	"""
	Set bridge STP (Spannign Tree) state. 0 -> STP disabled, 1 -> STP enabled

	Example:
	>>> from vyos.ifconfig import Interface
	>>> BridgeIf('br0').stp_state = 1
	"""

	if int(state) >= 0 and int(state) <= 1:
	return self._write_sysfs('/sys/class/net/{}/bridge/stp_state'
	.format(self._ifname), state)
	else:
	raise ValueError("Value out of range")


	def set_multicast_querier(self, enable):
	"""
	Sets whether the bridge actively runs a multicast querier or not. When a
	bridge receives a 'multicast host membership' query from another network
	host, that host is tracked based on the time that the query was received
	plus the multicast query interval time.

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

	Example:
	>>> from vyos.ifconfig import Interface
	>>> BridgeIf('br0').set_multicast_querier(1)
	"""
	if int(enable) >= 0 and int(enable) <= 1:
	return self._write_sysfs('/sys/class/net/{}/bridge/multicast_querier'
	.format(self._ifname), enable)
	else:
	raise ValueError("Value out of range")


	def add_port(self, interface):
	"""
	Add physical interface to bridge (member port)

	Example:
	>>> from vyos.ifconfig import Interface
	>>> BridgeIf('br0').add_port('eth0')
	>>> BridgeIf('br0').add_port('eth1')
	"""
	cmd = 'ip link set dev {} master {}'.format(interface, self._ifname)
	self._cmd(cmd)

	def del_port(self, interface):
	"""
	Remove member port from bridge instance.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> BridgeIf('br0').del_port('eth1')
	"""
	cmd = 'ip link set dev {} nomaster'.format(interface)
	self._cmd(cmd)

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

	Example:

	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').path_cost(4)
	"""
	return self._write_sysfs('/sys/class/net/{}/brif/{}/path_cost'
	.format(self._ifname, interface), cost)

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

	Example:

	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').priority(4)
	"""
	return self._write_sysfs('/sys/class/net/{}/brif/{}/priority'
	.format(self._ifname, interface), priority)


	class VLANIf(Interface):
	"""
	This class handels the creation and removal of a VLAN interface. It serves
	as base class for BondIf and EthernetIf.
	"""
	def __init__(self, ifname, type=None):
	super().__init__(ifname, type)

	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()
	"""
	# do we have sub interfaces (VLANs)?
	# we apply a regex matching subinterfaces (indicated by a .) of a
	# parent interface. 'bond0(?:\.\d+){1,2}' will match vif and vif-s/vif-c
	# subinterfaces
	vlan_ifs = [f for f in os.listdir(r'/sys/class/net') \
	if re.match(self._ifname + r'(?:\.\d+){1,2}', f)]

	for vlan in vlan_ifs:
	Interface(vlan).remove()

	# All subinterfaces are now removed, continue on the physical interface
	super().remove()


	def add_vlan(self, vlan_id, ethertype='', ingress_qos='', egress_qos=''):
	"""
	A virtual LAN (VLAN) is any broadcast domain that is partitioned and
	isolated in a computer network at the data link layer (OSI layer 2).
	Use this function to create a new VLAN interface on a given physical
	interface.

	This function creates both 802.1q and 802.1ad (Q-in-Q) interfaces. Proto
	parameter is used to indicate VLAN type.

	A new object of type VLANIf is returned once the interface has been
	created.

	@param ethertype: If specified, create 802.1ad or 802.1q Q-in-Q VLAN
	interface
	@param ingress_qos: Defines a mapping of VLAN header prio field to the
	Linux internal packet priority on incoming frames.
	@param ingress_qos: Defines a mapping of Linux internal packet priority
	to VLAN header prio field but for outgoing frames.

	Example:
	>>> from vyos.ifconfig import VLANIf
	>>> i = VLANIf('eth0')
	>>> i.add_vlan(10)
	"""
	vlan_ifname = self._ifname + '.' + str(vlan_id)
	if not os.path.exists('/sys/class/net/{}'.format(vlan_ifname)):
	self._vlan_id = int(vlan_id)

	if ethertype:
	self._ethertype = ethertype
	ethertype = 'proto {}'.format(ethertype)

	# Optional ingress QOS mapping
	opt_i = ''
	if ingress_qos:
	opt_i = 'ingress-qos-map ' + ingress_qos
	# Optional egress QOS mapping
	opt_e = ''
	if egress_qos:
	opt_e = 'egress-qos-map ' + egress_qos

	# create interface in the system
	cmd = 'ip link add link {intf} name {intf}.{vlan} type vlan {proto} id {vlan} {opt_e} {opt_i}' \
	.format(intf=self._ifname, vlan=self._vlan_id, proto=ethertype, opt_e=opt_e, opt_i=opt_i)
	self._cmd(cmd)

	# return new object mapping to the newly created interface
	# we can now work on this object for e.g. IP address setting
	# or interface description and so on
	return VLANIf(vlan_ifname)


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

	Example:
	>>> from vyos.ifconfig import VLANIf
	>>> i = VLANIf('eth0.10')
	>>> i.del_vlan()
	"""
	vlan_ifname = self._ifname + '.' + str(vlan_id)
	tmp = VLANIf(vlan_ifname)
	tmp.remove()


	class EthernetIf(VLANIf):
	"""
	Abstraction of a Linux Ethernet Interface
	"""
	def __init__(self, ifname):
	super().__init__(ifname)

	def get_driver_name(self):
	"""
	Return the driver name used by NIC. Some NICs don't support all
	features e.g. changing link-speed, duplex

	Example:
	>>> from vyos.ifconfig import EthernetIf
	>>> i = EthernetIf('eth0')
	>>> i.get_driver_name()
	'vmxnet3'
	"""
	link = os.readlink('/sys/class/net/{}/device/driver/module'.format(self._ifname))
	return os.path.basename(link)


	def has_autoneg(self):
	"""
	Not all drivers support autonegotiation.

	returns True -> Autonegotiation is supported by driver
	False -> Autonegotiation is not supported by driver

	Example:
	>>> from vyos.ifconfig import EthernetIf
	>>> i = EthernetIf('eth0')
	>>> i.has_autoneg()
	'True'
	"""
	regex = 'Supports auto-negotiation:[ ]\w+'
	tmp = self._cmd('/sbin/ethtool {}'.format(self._ifname))
	tmp = re.search(regex, tmp.decode())

	# Output is either 'Supports auto-negotiation: Yes' or
	# 'Supports auto-negotiation: No'
	if tmp.group().split(':')[1].lstrip() == "Yes":
	return True
	else:
	return False


	def set_flow_control(self, enable):
	"""
	Changes the pause parameters of the specified Ethernet device.

	@param enable: true -> enable pause frames, false -> disable pause frames

	Example:
	>>> from vyos.ifconfig import EthernetIf
	>>> i = EthernetIf('eth0')
	>>> i.set_flow_control(True)
	"""
	if enable not in ['on', 'off']:
	raise ValueError("Value out of range")

	if self.get_driver_name() in ['vmxnet3', 'virtio_net']:
	self._debug_msg('{} driver does not support changing flow control settings!'
	.format(self.get_driver_name()))
	return

	# Assemble command executed on system. Unfortunately there is no way
	# to change this setting via sysfs
	cmd = '/sbin/ethtool --pause {0} autoneg {1} tx {1} rx {1}'.format(
	self._ifname, enable)
	try:
	# An exception will be thrown if the settings are not changed
	self._cmd(cmd)
	except CalledProcessError:
	pass


	def set_speed_duplex(self, speed, duplex):
	"""
	Set link speed in Mbit/s and duplex.

	@speed can be any link speed in MBit/s, e.g. 10, 100, 1000 auto
	@duplex can be half, full, auto

	Example:
	>>> from vyos.ifconfig import EthernetIf
	>>> i = EthernetIf('eth0')
	>>> i.set_speed_duplex('auto', 'auto')
	"""

	if speed not in ['auto', '10', '100', '1000', '2500', '5000', '10000', '25000', '40000', '50000', '100000', '400000']:
	raise ValueError("Value out of range (speed)")

	if duplex not in ['auto', 'full', 'half']:
	raise ValueError("Value out of range (duplex)")

	if self.get_driver_name() in ['vmxnet3', 'virtio_net']:
	self._debug_msg('{} driver does not support changing speed/duplex settings!'
	.format(self.get_driver_name()))
	return


	cmd = '/sbin/ethtool -s {}'.format(self._ifname)
	if speed == 'auto' or duplex == 'auto':
	cmd += ' autoneg on'
	else:
	cmd += ' speed {} duplex {} autoneg off'.format(speed, duplex)

	return self._cmd(cmd)


	def set_gro(self, state):
	"""
	Example:
	>>> from vyos.ifconfig import EthernetIf
	>>> i = EthernetIf('eth0')
	>>> i.set_gro('on')
	"""
	if state not in ['on', 'off']:
	raise ValueError('state must be "on" or "off"')

	cmd = '/sbin/ethtool -K {} gro {}'.format(self._ifname, state)
	return self._cmd(cmd)


	def set_gso(self, state):
	"""
	Example:
	>>> from vyos.ifconfig import EthernetIf
	>>> i = EthernetIf('eth0')
	>>> i.set_gso('on')
	"""
	if state not in ['on', 'off']:
	raise ValueError('state must be "on" or "off"')

	cmd = '/sbin/ethtool -K {} gso {}'.format(self._ifname, state)
	return self._cmd(cmd)


	def set_sg(self, state):
	"""
	Example:
	>>> from vyos.ifconfig import EthernetIf
	>>> i = EthernetIf('eth0')
	>>> i.set_sg('on')
	"""
	if state not in ['on', 'off']:
	raise ValueError('state must be "on" or "off"')

	cmd = '/sbin/ethtool -K {} sg {}'.format(self._ifname, state)
	return self._cmd(cmd)


	def set_tso(self, state):
	"""
	Example:
	>>> from vyos.ifconfig import EthernetIf
	>>> i = EthernetIf('eth0')
	>>> i.set_tso('on')
	"""
	if state not in ['on', 'off']:
	raise ValueError('state must be "on" or "off"')

	cmd = '/sbin/ethtool -K {} tso {}'.format(self._ifname, state)
	return self._cmd(cmd)


	def set_ufo(self, state):
	"""
	Example:
	>>> from vyos.ifconfig import EthernetIf
	>>> i = EthernetIf('eth0')
	>>> i.set_udp_offload('on')
	"""
	if state not in ['on', 'off']:
	raise ValueError('state must be "on" or "off"')

	cmd = '/sbin/ethtool -K {} ufo {}'.format(self._ifname, state)
	return self._cmd(cmd)


	class BondIf(VLANIf):
	"""
	The Linux bonding driver provides a method for aggregating multiple network
	interfaces into a single logical "bonded" interface. The behavior of the
	bonded interfaces depends upon the mode; generally speaking, modes provide
	either hot standby or load balancing services. Additionally, link integrity
	monitoring may be performed.
	"""
	def __init__(self, ifname):
	super().__init__(ifname, type='bond')

	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()
	"""
	# when a bond member gets deleted, all members are placed in A/D state
	# even when they are enabled inside CLI. This will make the config
	# and system look async.
	slave_list = []
	for s in self.get_slaves():
	slave = {
	'ifname' : s,
	'state': Interface(s).state
	}
	slave_list.append(slave)

	# remove bond master which places members in disabled state
	super().remove()

	# replicate previous interface state before bond destruction back to
	# physical interface
	for slave in slave_list:
	i = Interface(slave['ifname'])
	i.state = slave['state']

	@property
	def xmit_hash_policy(self):
	"""
	Selects the transmit hash policy to use for slave selection in
	balance-xor, 802.3ad, and tlb modes. Possible values are: layer2,
	layer2+3, layer3+4, encap2+3, encap3+4.

	The default value is layer2

	Example:
	>>> from vyos.ifconfig import BondIf
	>>> BondIf('bond0').xmit_hash_policy
	'layer3+4'
	"""
	# Linux Kernel appends has policy value to string, e.g. 'layer3+4 1',
	# so remove the later part and only return the mode as string.
	return self._read_sysfs('/sys/class/net/{}/bonding/xmit_hash_policy'
	.format(self._ifname)).split()[0]

	@xmit_hash_policy.setter
	def xmit_hash_policy(self, mode):
	"""
	Selects the transmit hash policy to use for slave selection in
	balance-xor, 802.3ad, and tlb modes. Possible values are: layer2,
	layer2+3, layer3+4, encap2+3, encap3+4.

	The default value is layer2

	Example:
	>>> from vyos.ifconfig import BondIf
	>>> BondIf('bond0').xmit_hash_policy = 'layer2+3'
	>>> BondIf('bond0').proxy_arp
	'1'
	"""
	if not mode in ['layer2', 'layer2+3', 'layer3+4', 'encap2+3', 'encap3+4']:
	raise ValueError("Value out of range")
	return self._write_sysfs('/sys/class/net/{}/bonding/xmit_hash_policy'
	.format(self._ifname), mode)

	@property
	def arp_interval(self):
	"""
	Specifies the ARP link monitoring frequency in milliseconds.

	The ARP monitor works by periodically checking the slave devices to
	determine whether they have sent or received traffic recently (the
	precise criteria depends upon the bonding mode, and the state of the
	slave). Regular traffic is generated via ARP probes issued for the
	addresses specified by the arp_ip_target option.

	The default value is 0.

	Example:
	>>> from vyos.ifconfig import BondIf
	>>> BondIf('bond0').arp_interval
	'0'
	"""
	return self._read_sysfs('/sys/class/net/{}/bonding/arp_interval'
	.format(self._ifname))

	@arp_interval.setter
	def arp_interval(self, time):
	"""
	Specifies the IP addresses to use as ARP monitoring peers when
	arp_interval is > 0. These are the targets of the ARP request sent to
	determine the health of the link to the targets. Specify these values
	in ddd.ddd.ddd.ddd format. Multiple IP addresses must be separated by
	a comma. At least one IP address must be given for ARP monitoring to
	function. The maximum number of targets that can be specified is 16.

	The default value is no IP addresses.

	Example:
	>>> from vyos.ifconfig import BondIf
	>>> BondIf('bond0').arp_interval = '100'
	>>> BondIf('bond0').arp_interval
	'100'
	"""
	return self._write_sysfs('/sys/class/net/{}/bonding/arp_interval'
	.format(self._ifname), time)

	@property
	def arp_ip_target(self):
	"""
	Specifies the IP addresses to use as ARP monitoring peers when
	arp_interval is > 0. These are the targets of the ARP request sent to
	determine the health of the link to the targets. Specify these values
	in ddd.ddd.ddd.ddd format. Multiple IP addresses must be separated by
	a comma. At least one IP address must be given for ARP monitoring to
	function. The maximum number of targets that can be specified is 16.

	The default value is no IP addresses.

	Example:
	>>> from vyos.ifconfig import BondIf
	>>> BondIf('bond0').arp_ip_target
	'192.0.2.1'
	"""
	return self._read_sysfs('/sys/class/net/{}/bonding/arp_ip_target'
	.format(self._ifname))

	@arp_ip_target.setter
	def arp_ip_target(self, target):
	"""
	Specifies the IP addresses to use as ARP monitoring peers when
	arp_interval is > 0. These are the targets of the ARP request sent to
	determine the health of the link to the targets. Specify these values
	in ddd.ddd.ddd.ddd format. Multiple IP addresses must be separated by
	a comma. At least one IP address must be given for ARP monitoring to
	function. The maximum number of targets that can be specified is 16.

	The default value is no IP addresses.

	Example:
	>>> from vyos.ifconfig import BondIf
	>>> BondIf('bond0').arp_ip_target = '192.0.2.1'
	>>> BondIf('bond0').arp_ip_target
	'192.0.2.1'
	"""
	return self._write_sysfs('/sys/class/net/{}/bonding/arp_ip_target'
	.format(self._ifname), target)

	@property
	def miimon(self):
	"""
	Specifies the MII link monitoring frequency in milliseconds.
	This determines how often the link state of each slave is
	inspected for link failures. A value of zero disables MII
	link monitoring. A value of 100 is a good starting point.

	The default value is 0.

	Example:
	>>> from vyos.ifconfig import BondIf
	>>> BondIf('bond0').miimon
	'250'
	"""
	return self._read_sysfs('/sys/class/net/{}/bonding/miimon'
	.format(self._ifname))


	@miimon.setter
	def miimon(self, time):
	"""
	Specifies the MII link monitoring frequency in milliseconds.
	This determines how often the link state of each slave is
	inspected for link failures. A value of zero disables MII
	link monitoring. A value of 100 is a good starting point.

	The default value is 0.

	Example:
	>>> from vyos.ifconfig import BondIf
	>>> BondIf('bond0').miimon = 250
	>>> BondIf('bond0').miimon
	'250'
	"""
	return self._write_sysfs('/sys/class/net/{}/bonding/miimon'
	.format(self._ifname), time)


	def add_port(self, interface):
	"""
	Enslave physical interface to bond.

	Example:
	>>> from vyos.ifconfig import BondIf
	>>> BondIf('bond0').add_port('eth0')
	>>> BondIf('bond0').add_port('eth1')
	"""
	# An interface can only be added to a bond if it is in 'down' state. If
	# interface is in 'up' state, the following Kernel error will be thrown:
	# bond0: eth1 is up - this may be due to an out of date ifenslave.
	Interface(interface).state = 'down'

	return self._write_sysfs('/sys/class/net/{}/bonding/slaves'
	.format(self._ifname), '+' + interface)

	def del_port(self, interface):
	"""
	Remove physical port from bond

	Example:
	>>> from vyos.ifconfig import BondIf
	>>> BondIf('bond0').del_port('eth1')
	"""
	return self._write_sysfs('/sys/class/net/{}/bonding/slaves'
	.format(self._ifname), '-' + interface)

	def get_slaves(self):
	"""
	Return a list with all configured slave interfaces on this bond.

	Example:
	>>> from vyos.ifconfig import BondIf
	>>> BondIf('bond0').get_slaves()
	['eth1', 'eth2']
	"""
	slaves = self._read_sysfs('/sys/class/net/{}/bonding/slaves'
	.format(self._ifname))
	return list(map(str, slaves.split()))


	def set_primary(self, interface):
	"""
	A string (eth0, eth2, etc) specifying which slave is the primary
	device. The specified device will always be the active slave while it
	is available. Only when the primary is off-line will alternate devices
	be used. This is useful when one slave is preferred over another, e.g.,
	when one slave has higher throughput than another.

	The primary option is only valid for active-backup, balance-tlb and
	balance-alb mode.

	Example:
	>>> from vyos.ifconfig import BondIf
	>>> BondIf('bond0').set_primary('eth2')
	"""
	if not interface:
	# reset primary interface
	interface = '\0'

	return self._write_sysfs('/sys/class/net/{}/bonding/primary'
	.format(self._ifname), interface)

	@property
	def mode(self):
	"""
	Specifies one of the bonding policies. The default is balance-rr
	(round robin).

	Possible values are: balance-rr (0), active-backup (1), balance-xor (2),
	broadcast (3), 802.3ad (4), balance-tlb (5), balance-alb (6)

	Example:
	>>> from vyos.ifconfig import BondIf
	>>> BondIf('bond0').mode
	'balance-rr'
	"""
	return self._read_sysfs('/sys/class/net/{}/bonding/mode'
	.format(self._ifname)).split()[0]

	@mode.setter
	def mode(self, mode):
	"""
	Specifies one of the bonding policies. The default is balance-rr
	(round robin).

	Possible values are: balance-rr, active-backup, balance-xor,
	broadcast, 802.3ad, balance-tlb, balance-alb

	NOTE: the bonding mode can not be changed when the bond itself has
	slaves

	Example:
	>>> from vyos.ifconfig import BondIf
	>>> BondIf('bond0').mode = '802.3ad'
	>>> BondIf('bond0').mode
	'802.3ad'
	"""
	if not mode in [
	'balance-rr', 'active-backup', 'balance-xor', 'broadcast',
	'802.3ad', 'balance-tlb', 'balance-alb']:
	raise ValueError("Value out of range")

	return self._write_sysfs('/sys/class/net/{}/bonding/mode'
	.format(self._ifname), mode)


	class WireGuardIf(Interface):
	"""
	Wireguard interface class, contains a comnfig dictionary since
	wireguard VPN is being comnfigured via the wg command rather than
	writing the config into a file. Otherwise if a pre-shared key is used
	(symetric enryption key), it would we exposed within multiple files.
	Currently it's only within the config.boot if the config was saved.

	Example:
	>>> from vyos.ifconfig import WireGuardIf as wg_if
	>>> wg_intfc = wg_if("wg01")
	>>> print (wg_intfc.wg_config)
	{'private-key': None, 'keepalive': 0, 'endpoint': None, 'port': 0,
	'allowed-ips': [], 'pubkey': None, 'fwmark': 0, 'psk': '/dev/null'}
	>>> wg_intfc.wg_config['keepalive'] = 100
	>>> print (wg_intfc.wg_config)
	{'private-key': None, 'keepalive': 100, 'endpoint': None, 'port': 0,
	'allowed-ips': [], 'pubkey': None, 'fwmark': 0, 'psk': '/dev/null'}
	"""

	def __init__(self, ifname):
	super().__init__(ifname, type='wireguard')
	self.config = {
	'port': 0,
	'private-key': None,
	'pubkey': None,
	'psk': '/dev/null',
	'allowed-ips': [],
	'fwmark': 0x00,
	'endpoint': None,
	'keepalive': 0
	}

	def update(self):
	if not self.config['private-key']:
	raise ValueError("private key required")
	else:
	# fmask permission check?
	pass

	cmd = "wg set {} ".format(self._ifname)
	cmd += "listen-port {} ".format(self.config['port'])
	cmd += "fwmark {} ".format(str(self.config['fwmark']))
	cmd += "private-key {} ".format(self.config['private-key'])
	cmd += "peer {} ".format(self.config['pubkey'])
	cmd += " preshared-key {} ".format(self.config['psk'])
	cmd += " allowed-ips "
	for aip in self.config['allowed-ips']:
	if aip != self.config['allowed-ips'][-1]:
	cmd += aip + ","
	else:
	cmd += aip
	if self.config['endpoint']:
	cmd += " endpoint {}".format(self.config['endpoint'])
	cmd += " persistent-keepalive {}".format(self.config['keepalive'])

	self._cmd(cmd)

	# remove psk since it isn't required anymore and is saved in the cli
	# config only !!
	if self.config['psk'] != '/dev/null':
	if os.path.exists(self.config['psk']):
	os.remove(self.config['psk'])


	def remove_peer(self, peerkey):
	"""
	Remove a peer of an interface, peers are identified by their public key.
	Giving it a readable name is a vyos feature, to remove a peer the pubkey
	and the interface is needed, to remove the entry.
	"""
	cmd = "wg set {0} peer {1} remove".format(
	self._ifname, str(peerkey))
	self._cmd(cmd)


	class VXLANIf(Interface, ):
	"""
	The VXLAN protocol is a tunnelling protocol designed to solve the
	problem of limited VLAN IDs (4096) in IEEE 802.1q. With VXLAN the
	size of the identifier is expanded to 24 bits (16777216).

	VXLAN is described by IETF RFC 7348, and has been implemented by a
	number of vendors. The protocol runs over UDP using a single
	destination port. This document describes the Linux kernel tunnel
	device, there is also a separate implementation of VXLAN for
	Openvswitch.

	Unlike most tunnels, a VXLAN is a 1 to N network, not just point to
	point. A VXLAN device can learn the IP address of the other endpoint
	either dynamically in a manner similar to a learning bridge, or make
	use of statically-configured forwarding entries.

	For more information please refer to:
	https://www.kernel.org/doc/Documentation/networking/vxlan.txt
	"""
	def __init__(self, ifname, config=''):
	if config:
	self._ifname = ifname

	if not os.path.exists('/sys/class/net/{}'.format(self._ifname)):
	# we assume that by default a multicast interface is created
	group = 'group {}'.format(config['group'])

	# if remote host is specified we ignore the multicast address
	if config['remote']:
	group = 'remote {}'.format(config['remote'])

	# an underlay device is not always specified
	dev = ''
	if config['dev']:
	dev = 'dev {}'.format(config['dev'])

	cmd = 'ip link add {intf} type vxlan id {vni} {grp_rem} {dev} dstport {port}' \
	.format(intf=self._ifname, vni=config['vni'], grp_rem=group, dev=dev, port=config['port'])
	self._cmd(cmd)

	super().__init__(ifname, type='vxlan')

	@staticmethod
	def get_config():
	"""
	VXLAN interfaces require a configuration when they are added using
	iproute2. This static method will provide the configuration dictionary
	used by this class.

	Example:
	>> dict = VXLANIf().get_config()
	"""
	config = {
	'vni': 0,
	'dev': '',
	'group': '',
	'port': 8472, # The Linux implementation of VXLAN pre-dates
	# the IANA's selection of a standard destination port
	'remote': ''
	}
	return config

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