interface-bonding.py
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interface-bonding.py
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	#!/usr/bin/env python3
	#
	# Copyright (C) 2019 VyOS maintainers and contributors
	#
	# This program is free software; you can redistribute it and/or modify
	# it under the terms of the GNU General Public License version 2 or later as
	# published by the Free Software Foundation.
	#
	# This program 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 General Public License for more details.
	#
	# You should have received a copy of the GNU General Public License
	# along with this program. If not, see <http://www.gnu.org/licenses/>.
	#
	#

	import os

	from copy import deepcopy
	from sys import exit
	from netifaces import interfaces

	from vyos.ifconfig import BondIf, EthernetIf
	from vyos.config import Config
	from vyos import ConfigError

	default_config_data = {
	'address': [],
	'address_remove': [],
	'arp_mon_intvl': 0,
	'arp_mon_tgt': [],
	'description': '',
	'deleted': False,
	'dhcp_client_id': '',
	'dhcp_hostname': '',
	'dhcpv6_prm_only': False,
	'dhcpv6_temporary': False,
	'disable': False,
	'disable_link_detect': 1,
	'hash_policy': 'layer2',
	'ip_arp_cache_tmo': 30,
	'ip_proxy_arp': 0,
	'ip_proxy_arp_pvlan': 0,
	'intf': '',
	'mac': '',
	'mode': '802.3ad',
	'member': [],
	'mtu': 1500,
	'primary': '',
	'vif_s': [],
	'vif_s_remove': [],
	'vif': [],
	'vif_remove': []
	}

	def diff(first, second):
	second = set(second)
	return [item for item in first if item not in second]

	def get_bond_mode(mode):
	if mode == 'round-robin':
	return 'balance-rr'
	elif mode == 'active-backup':
	return 'active-backup'
	elif mode == 'xor-hash':
	return 'balance-xor'
	elif mode == 'broadcast':
	return 'broadcast'
	elif mode == '802.3ad':
	return '802.3ad'
	elif mode == 'transmit-load-balance':
	return 'balance-tlb'
	elif mode == 'adaptive-load-balance':
	return 'balance-alb'
	else:
	raise ConfigError('invalid bond mode "{}"'.format(mode))

	def get_ethertype(ethertype_val):
	if ethertype_val == '0x88A8':
	return '802.1ad'
	elif ethertype_val == '0x8100':
	return '802.1q'
	else:
	raise ConfigError('invalid ethertype "{}"'.format(ethertype_val))


	def vlan_to_dict(conf):
	"""
	Common used function which will extract VLAN related information from config
	and represent the result as Python dictionary.

	Function call's itself recursively if a vif-s/vif-c pair is detected.
	"""
	vlan = {
	'id': conf.get_level().split()[-1], # get the '100' in 'interfaces bonding bond0 vif-s 100'
	'address': [],
	'address_remove': [],
	'description': '',
	'dhcp_client_id': '',
	'dhcp_hostname': '',
	'dhcpv6_prm_only': False,
	'dhcpv6_temporary': False,
	'disable': False,
	'disable_link_detect': 1,
	'mac': '',
	'mtu': 1500
	}
	# retrieve configured interface addresses
	if conf.exists('address'):
	vlan['address'] = conf.return_values('address')

	# Determine interface addresses (currently effective) - to determine which
	# address is no longer valid and needs to be removed from the bond
	eff_addr = conf.return_effective_values('address')
	act_addr = conf.return_values('address')
	vlan['address_remove'] = diff(eff_addr, act_addr)

	# retrieve interface description
	if conf.exists('description'):
	vlan['description'] = conf.return_value('description')

	# get DHCP client identifier
	if conf.exists('dhcp-options client-id'):
	vlan['dhcp_client_id'] = conf.return_value('dhcp-options client-id')

	# DHCP client host name (overrides the system host name)
	if conf.exists('dhcp-options host-name'):
	vlan['dhcp_hostname'] = conf.return_value('dhcp-options host-name')

	# DHCPv6 only acquire config parameters, no address
	if conf.exists('dhcpv6-options parameters-only'):
	vlan['dhcpv6_prm_only'] = conf.return_value('dhcpv6-options parameters-only')

	# DHCPv6 temporary IPv6 address
	if conf.exists('dhcpv6-options temporary'):
	vlan['dhcpv6_temporary'] = conf.return_value('dhcpv6-options temporary')

	# ignore link state changes
	if conf.exists('disable-link-detect'):
	vlan['disable_link_detect'] = 2

	# disable bond interface
	if conf.exists('disable'):
	vlan['disable'] = True

	# Media Access Control (MAC) address
	if conf.exists('mac'):
	vlan['mac'] = conf.return_value('mac')

	# Maximum Transmission Unit (MTU)
	if conf.exists('mtu'):
	vlan['mtu'] = int(conf.return_value('mtu'))

	# ethertype is mandatory on vif-s nodes and only exists here!
	# check if this is a vif-s node at all:
	if conf.get_level().split()[-2] == 'vif-s':
	vlan['vif_c'] = []
	vlan['vif_c_remove'] = []

	# ethertype uses a default of 0x88A8
	tmp = '0x88A8'
	if conf.exists('ethertype'):
	tmp = conf.return_value('ethertype')
	vlan['ethertype'] = get_ethertype(tmp)

	# get vif-c interfaces (currently effective) - to determine which vif-c
	# interface is no longer present and needs to be removed
	eff_intf = conf.list_effective_nodes('vif-c')
	act_intf = conf.list_nodes('vif-c')
	vlan['vif_c_remove'] = diff(eff_intf, act_intf)

	# check if there is a Q-in-Q vlan customer interface
	# and call this function recursively
	if conf.exists('vif-c'):
	cfg_level = conf.get_level()
	# add new key (vif-c) to dictionary
	for vif in conf.list_nodes('vif-c'):
	# set config level to vif interface
	conf.set_level(cfg_level + ' vif-c ' + vif)
	vlan['vif_c'].append(vlan_to_dict(conf))

	return vlan


	def apply_vlan_config(vlan, config):
	"""
	Generic function to apply a VLAN configuration from a dictionary
	to a VLAN interface
	"""

	if type(vlan) != type(EthernetIf("lo")):
	raise TypeError()

	# Configure interface address(es)
	for addr in config['address_remove']:
	vlan.del_addr(addr)
	for addr in config['address']:
	vlan.add_addr(addr)

	# update interface description used e.g. within SNMP
	vlan.ifalias = config['description']
	# ignore link state changes
	vlan.link_detect = config['disable_link_detect']
	# Maximum Transmission Unit (MTU)
	vlan.mtu = config['mtu']
	# Change VLAN interface MAC address
	if config['mac']:
	vlan.mac = config['mac']

	# enable/disable VLAN interface
	if config['disable']:
	vlan.state = 'down'
	else:
	vlan.state = 'up'


	def get_config():
	# initialize kernel module if not loaded
	if not os.path.isfile('/sys/class/net/bonding_masters'):
	import syslog
	syslog.syslog(syslog.LOG_NOTICE, "loading bonding kernel module")
	if os.system('modprobe bonding max_bonds=0 miimon=250') != 0:
	syslog.syslog(syslog.LOG_NOTICE, "failed loading bonding kernel module")
	raise ConfigError("failed loading bonding kernel module")

	bond = deepcopy(default_config_data)
	conf = Config()

	# determine tagNode instance
	try:
	bond['intf'] = os.environ['VYOS_TAGNODE_VALUE']
	except KeyError as E:
	print("Interface not specified")

	# check if bond has been removed
	cfg_base = 'interfaces bonding ' + bond['intf']
	if not conf.exists(cfg_base):
	bond['deleted'] = True
	return bond

	# set new configuration level
	conf.set_level(cfg_base)

	# retrieve configured interface addresses
	if conf.exists('address'):
	bond['address'] = conf.return_values('address')

	# ARP link monitoring frequency in milliseconds
	if conf.exists('arp-monitor interval'):
	bond['arp_mon_intvl'] = int(conf.return_value('arp-monitor interval'))

	# IP address to use for ARP monitoring
	if conf.exists('arp-monitor target'):
	bond['arp_mon_tgt'] = conf.return_values('arp-monitor target')

	# retrieve interface description
	if conf.exists('description'):
	bond['description'] = conf.return_value('description')
	else:
	bond['description'] = bond['intf']

	# get DHCP client identifier
	if conf.exists('dhcp-options client-id'):
	bond['dhcp_client_id'] = conf.return_value('dhcp-options client-id')

	# DHCP client host name (overrides the system host name)
	if conf.exists('dhcp-options host-name'):
	bond['dhcp_hostname'] = conf.return_value('dhcp-options host-name')

	# DHCPv6 only acquire config parameters, no address
	if conf.exists('dhcpv6-options parameters-only'):
	bond['dhcpv6_prm_only'] = conf.return_value('dhcpv6-options parameters-only')

	# DHCPv6 temporary IPv6 address
	if conf.exists('dhcpv6-options temporary'):
	bond['dhcpv6_temporary'] = conf.return_value('dhcpv6-options temporary')

	# ignore link state changes
	if conf.exists('disable-link-detect'):
	bond['disable_link_detect'] = 2

	# disable bond interface
	if conf.exists('disable'):
	bond['disable'] = True

	# Bonding transmit hash policy
	if conf.exists('hash-policy'):
	bond['hash_policy'] = conf.return_value('hash-policy')

	# ARP cache entry timeout in seconds
	if conf.exists('ip arp-cache-timeout'):
	bond['ip_arp_cache_tmo'] = int(conf.return_value('ip arp-cache-timeout'))

	# Enable proxy-arp on this interface
	if conf.exists('ip enable-proxy-arp'):
	bond['ip_proxy_arp'] = 1

	# Enable private VLAN proxy ARP on this interface
	if conf.exists('ip proxy-arp-pvlan'):
	bond['ip_proxy_arp_pvlan'] = 1

	# Media Access Control (MAC) address
	if conf.exists('mac'):
	bond['mac'] = conf.return_value('mac')

	# Bonding mode
	if conf.exists('mode'):
	bond['mode'] = get_bond_mode(conf.return_value('mode'))

	# Maximum Transmission Unit (MTU)
	if conf.exists('mtu'):
	bond['mtu'] = int(conf.return_value('mtu'))

	# determine bond member interfaces (currently configured)
	if conf.exists('member interface'):
	bond['member'] = conf.return_values('member interface')

	# get interface addresses (currently effective) - to determine which
	# address is no longer valid and needs to be removed from the bond
	eff_addr = conf.return_effective_values('address')
	act_addr = conf.return_values('address')
	bond['address_remove'] = diff(eff_addr, act_addr)

	# Primary device interface
	if conf.exists('primary'):
	bond['primary'] = conf.return_value('primary')

	# re-set configuration level and retrieve vif-s interfaces
	conf.set_level(cfg_base)
	# get vif-s interfaces (currently effective) - to determine which vif-s
	# interface is no longer present and needs to be removed
	eff_intf = conf.list_effective_nodes('vif-s')
	act_intf = conf.list_nodes('vif-s')
	bond['vif_s_remove'] = diff(eff_intf, act_intf)

	if conf.exists('vif-s'):
	for vif_s in conf.list_nodes('vif-s'):
	# set config level to vif-s interface
	conf.set_level(cfg_base + ' vif-s ' + vif_s)
	bond['vif_s'].append(vlan_to_dict(conf))

	# re-set configuration level and retrieve vif-s interfaces
	conf.set_level(cfg_base)
	# Determine vif interfaces (currently effective) - to determine which
	# vif interface is no longer present and needs to be removed
	eff_intf = conf.list_effective_nodes('vif')
	act_intf = conf.list_nodes('vif')
	bond['vif_remove'] = diff(eff_intf, act_intf)

	if conf.exists('vif'):
	for vif in conf.list_nodes('vif'):
	# set config level to vif interface
	conf.set_level(cfg_base + ' vif ' + vif)
	bond['vif'].append(vlan_to_dict(conf))

	return bond


	def verify(bond):
	if len (bond['arp_mon_tgt']) > 16:
	raise ConfigError('The maximum number of targets that can be specified is 16')

	if bond['primary']:
	if bond['mode'] not in ['active-backup', 'balance-tlb', 'balance-alb']:
	raise ConfigError('Mode dependency failed, primary not supported in this mode.'.format())

	if bond['primary'] not in bond['member']:
	raise ConfigError('Interface "{}" is not part of the bond'.format(bond['primary']))

	for vif_s in bond['vif_s']:
	for vif in bond['vif']:
	if vif['id'] == vif_s['id']:
	raise ConfigError('Can not use identical ID on vif and vif-s interface')


	conf = Config()
	for intf in bond['member']:
	# we can not add disabled slave interfaces to our bond
	if conf.exists('interfaces ethernet ' + intf + ' disable'):
	raise ConfigError('can not add disabled interface {} to {}'.format(intf, bond['intf']))

	# can not add interfaces with an assigned address to a bond
	if conf.exists('interfaces ethernet ' + intf + ' address'):
	raise ConfigError('can not add interface {} with an assigned address to {}'.format(intf, bond['intf']))

	# bond members are not allowed to be bridge members, too
	for bridge in conf.list_nodes('interfaces bridge'):
	if conf.exists('interfaces bridge ' + bridge + ' member interface ' + intf):
	raise ConfigError('can not add interface {} that is part of bridge {} to {}'.format(intf, bridge, bond['intf']))

	# bond members are not allowed to be vrrp members, too
	for vrrp in conf.list_nodes('high-availability vrrp group'):
	if conf.exists('high-availability vrrp group ' + vrrp + ' interface ' + intf):
	raise ConfigError('can not add interface {} which belongs to a VRRP group to {}'.format(intf, bond['intf']))

	# bond members are not allowed to be underlaying psuedo-ethernet devices
	for peth in conf.list_nodes('interfaces pseudo-ethernet'):
	if conf.exists('interfaces pseudo-ethernet ' + peth + ' link ' + intf):
	raise ConfigError('can not add interface {} used by pseudo-ethernet {} to {}'.format(intf, peth, bond['intf']))

	if bond['primary']:
	if bond['primary'] not in bond['member']:
	raise ConfigError('primary interface must be a member interface of {}'.format(bond['intf']))

	if bond['mode'] not in ['active-backup', 'balance-tlb', 'balance-alb']:
	raise ConfigError('primary interface only works for mode active-backup, transmit-load-balance or adaptive-load-balance')

	if bond['arp_mon_intvl'] > 0:
	if bond['mode'] in ['802.3ad', 'balance-tlb', 'balance-alb']:
	raise ConfigError('ARP link monitoring does not work for mode 802.3ad, transmit-load-balance or adaptive-load-balance')

	return None


	def generate(bond):
	return None


	def apply(bond):
	b = BondIf(bond['intf'])

	if bond['deleted']:
	# delete bonding interface
	b.remove()
	else:
	# Some parameters can not be changed when the bond is up.
	# Always disable the bond prior changing anything
	b.state = 'down'

	# The bonding mode can not be changed when there are interfaces enslaved
	# to this bond, thus we will free all interfaces from the bond first!
	for intf in b.get_slaves():
	b.del_port(intf)

	# Configure interface address(es)
	for addr in bond['address_remove']:
	b.del_addr(addr)
	for addr in bond['address']:
	b.add_addr(addr)

	# ARP link monitoring frequency
	b.arp_interval = bond['arp_mon_intvl']
	# reset miimon on arp-montior deletion
	if bond['arp_mon_intvl'] == 0:
	# reset miimon to default
	b.bond_miimon = 250

	# ARP monitor targets need to be synchronized between sysfs and CLI.
	# Unfortunately an address can't be send twice to sysfs as this will
	# result in the following exception: OSError: [Errno 22] Invalid argument.
	#
	# We remove ALL adresses prior adding new ones, this will remove addresses
	# added manually by the user too - but as we are limited to 16 adresses
	# from the kernel side this looks valid to me. We won't run into an error
	# when a user added manual adresses which would result in having more
	# then 16 adresses in total.
	cur_addr = list(map(str, b.arp_ip_target.split()))
	for addr in cur_addr:
	b.arp_ip_target = '-' + addr

	# Add configured ARP target addresses
	for addr in bond['arp_mon_tgt']:
	b.arp_ip_target = '+' + addr

	# update interface description used e.g. within SNMP
	b.ifalias = bond['description']

	#
	# missing DHCP/DHCPv6 options go here
	#

	# ignore link state changes
	b.link_detect = bond['disable_link_detect']
	# Bonding transmit hash policy
	b.xmit_hash_policy = bond['hash_policy']
	# configure ARP cache timeout in milliseconds
	b.arp_cache_tmp = bond['ip_arp_cache_tmo']
	# Enable proxy-arp on this interface
	b.proxy_arp = bond['ip_proxy_arp']
	# Enable private VLAN proxy ARP on this interface
	b.proxy_arp_pvlan = bond['ip_proxy_arp_pvlan']

	# Change interface MAC address
	if bond['mac']:
	b.mac = bond['mac']

	# Bonding policy
	b.mode = bond['mode']
	# Maximum Transmission Unit (MTU)
	b.mtu = bond['mtu']

	# Primary device interface
	if bond['primary']:
	b.primary = bond['primary']

	# Add (enslave) interfaces to bond
	for intf in bond['member']:
	b.add_port(intf)

	# remove no longer required service VLAN interfaces (vif-s)
	for vif_s in bond['vif_s_remove']:
	b.del_vlan(vif_s)

	# create service VLAN interfaces (vif-s)
	for vif_s in bond['vif_s']:
	s_vlan = b.add_vlan(vif_s['id'], ethertype=vif_s['ethertype'])
	apply_vlan_config(s_vlan, vif_s)

	# remove no longer required client VLAN interfaces (vif-c)
	# on lower service VLAN interface
	for vif_c in vif_s['vif_c_remove']:
	s_vlan.del_vlan(vif_c)

	# create client VLAN interfaces (vif-c)
	# on lower service VLAN interface
	for vif_c in vif_s['vif_c']:
	c_vlan = s_vlan.add_vlan(vif_c['id'])
	apply_vlan_config(c_vlan, vif_c)

	# remove no longer required VLAN interfaces (vif)
	for vif in bond['vif_remove']:
	b.del_vlan(vif)

	# create VLAN interfaces (vif)
	for vif in bond['vif']:
	vlan = b.add_vlan(vif['id'])
	apply_vlan_config(vlan, vif)

	# As the bond interface is always disabled first when changing
	# parameters we will only re-enable the interface if it is not
	# administratively disabled
	if not bond['disable']:
	b.state = 'up'

	return None

	if __name__ == '__main__':
	try:
	c = get_config()
	verify(c)
	generate(c)
	apply(c)
	except ConfigError as e:
	print(e)
	exit(1)

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