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interfaces-l2tpv3.py
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interfaces-l2tpv3.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 sys import exit
from copy import deepcopy
from vyos.config import Config
from vyos.ifconfig import L2TPv3If, Interface
from vyos import ConfigError
from netifaces import interfaces
default_config_data = {
'address': [],
'deleted': False,
'description': '',
'disable': False,
'encapsulation': 'udp',
'local_address': '',
'local_port': 5000,
'intf': '',
'mtu': 1488,
'peer_session_id': '',
'peer_tunnel_id': '',
'remote_address': '',
'remote_port': 5000,
'session_id': '',
'tunnel_id': ''
}
def get_config():
l2tpv3 = deepcopy(default_config_data)
conf = Config()
# determine tagNode instance
try:
l2tpv3['intf'] = os.environ['VYOS_TAGNODE_VALUE']
except KeyError as E:
print("Interface not specified")
# Check if interface has been removed
if not conf.exists('interfaces l2tpv3 ' + l2tpv3['intf']):
l2tpv3['deleted'] = True
# to delete the l2tpv3 interface we need to current
# tunnel_id and session_id
if conf.exists_effective('interfaces l2tpv3 {} tunnel-id'.format(l2tpv3['intf'])):
l2tpv3['tunnel_id'] = conf.return_effective_value(
'interfaces l2tpv3 {} tunnel-id'.format(l2tpv3['intf']))
if conf.exists_effective('interfaces l2tpv3 {} session-id'.format(l2tpv3['intf'])):
l2tpv3['session_id'] = conf.return_effective_value(
'interfaces l2tpv3 {} session-id'.format(l2tpv3['intf']))
return l2tpv3
# set new configuration level
conf.set_level('interfaces l2tpv3 ' + l2tpv3['intf'])
# retrieve configured interface addresses
if conf.exists('address'):
l2tpv3['address'] = conf.return_values('address')
# retrieve interface description
if conf.exists('description'):
l2tpv3['description'] = conf.return_value('description')
# get tunnel destination port
if conf.exists('destination-port'):
l2tpv3['remote_port'] = int(conf.return_value('destination-port'))
# Disable this interface
if conf.exists('disable'):
l2tpv3['disable'] = True
# get tunnel encapsulation type
if conf.exists('encapsulation'):
l2tpv3['encapsulation'] = conf.return_value('encapsulation')
# get tunnel local ip address
if conf.exists('local-ip'):
l2tpv3['local_address'] = conf.return_value('local-ip')
# Maximum Transmission Unit (MTU)
if conf.exists('mtu'):
l2tpv3['mtu'] = int(conf.return_value('mtu'))
# Remote session id
if conf.exists('peer-session-id'):
l2tpv3['peer_session_id'] = conf.return_value('peer-session-id')
# Remote tunnel id
if conf.exists('peer-tunnel-id'):
l2tpv3['peer_tunnel_id'] = conf.return_value('peer-tunnel-id')
# Remote address of L2TPv3 tunnel
if conf.exists('remote-ip'):
l2tpv3['remote_address'] = conf.return_value('remote-ip')
# Local session id
if conf.exists('session-id'):
l2tpv3['session_id'] = conf.return_value('session-id')
# get local tunnel port
if conf.exists('source-port'):
l2tpv3['local_port'] = conf.return_value('source-port')
# get local tunnel id
if conf.exists('tunnel-id'):
l2tpv3['tunnel_id'] = conf.return_value('tunnel-id')
return l2tpv3
def verify(l2tpv3):
if l2tpv3['deleted']:
# bail out early
return None
if not l2tpv3['local_address']:
raise ConfigError('Must configure the l2tpv3 local-ip for {}'.format(l2tpv3['intf']))
if not l2tpv3['remote_address']:
raise ConfigError('Must configure the l2tpv3 remote-ip for {}'.format(l2tpv3['intf']))
if not l2tpv3['tunnel_id']:
raise ConfigError('Must configure the l2tpv3 tunnel-id for {}'.format(l2tpv3['intf']))
if not l2tpv3['peer_tunnel_id']:
raise ConfigError('Must configure the l2tpv3 peer-tunnel-id for {}'.format(l2tpv3['intf']))
if not l2tpv3['session_id']:
raise ConfigError('Must configure the l2tpv3 session-id for {}'.format(l2tpv3['intf']))
if not l2tpv3['peer_session_id']:
raise ConfigError('Must configure the l2tpv3 peer-session-id for {}'.format(l2tpv3['intf']))
return None
def generate(l2tpv3):
if l2tpv3['deleted']:
# bail out early
return None
# initialize kernel module if not loaded
if not os.path.isdir('/sys/module/l2tp_eth'):
if os.system('modprobe l2tp_eth') != 0:
raise ConfigError("failed loading l2tp_eth kernel module")
if not os.path.isdir('/sys/module/l2tp_netlink'):
if os.system('modprobe l2tp_netlink') != 0:
raise ConfigError("failed loading l2tp_netlink kernel module")
if not os.path.isdir('/sys/module/l2tp_ip'):
if os.system('modprobe l2tp_ip') != 0:
raise ConfigError("failed loading l2tp_ip kernel module")
if l2tpv3['encapsulation'] == 'ip':
if not os.path.isdir('/sys/module/l2tp_ip'):
if os.system('modprobe l2tp_ip') != 0:
raise ConfigError("failed loading l2tp_ip kernel module")
if not os.path.isdir('/sys/module/l2tp_ip6 '):
if os.system('modprobe l2tp_ip6 ') != 0:
raise ConfigError("failed loading l2tp_ip6 kernel module")
return None
def apply(l2tpv3):
# L2TPv3 interface needs to be created/deleted on-block, instead of
# passing a ton of arguments, I just use a dict that is managed by
# vyos.ifconfig
conf = deepcopy(L2TPv3If.get_config())
# Check if L2TPv3 interface already exists
if l2tpv3['intf'] in interfaces():
# L2TPv3 is picky when changing tunnels/sessions, thus we can simply
# always delete it first.
conf['session_id'] = l2tpv3['session_id']
conf['tunnel_id'] = l2tpv3['tunnel_id']
l = L2TPv3If(l2tpv3['intf'], **conf)
l.remove()
if not l2tpv3['deleted']:
conf['peer_tunnel_id'] = l2tpv3['peer_tunnel_id']
conf['local_port'] = l2tpv3['local_port']
conf['remote_port'] = l2tpv3['remote_port']
conf['encapsulation'] = l2tpv3['encapsulation']
conf['local_address'] = l2tpv3['local_address']
conf['remote_address'] = l2tpv3['remote_address']
conf['session_id'] = l2tpv3['session_id']
conf['tunnel_id'] = l2tpv3['tunnel_id']
conf['peer_session_id'] = l2tpv3['peer_session_id']
# Finally create the new interface
l = L2TPv3If(l2tpv3['intf'], **conf)
# update interface description used e.g. by SNMP
l.set_alias(l2tpv3['description'])
# Maximum Transfer Unit (MTU)
l.set_mtu(l2tpv3['mtu'])
# Configure interface address(es) - no need to implicitly delete the
# old addresses as they have already been removed by deleting the
# interface above
for addr in l2tpv3['address']:
l.add_addr(addr)
# As the interface is always disabled first when changing parameters
# we will only re-enable the interface if it is not administratively
# disabled
if not l2tpv3['disable']:
l.set_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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