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l2tpv3.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
from vyos.ifconfig.interface import Interface
class L2TPv3If(Interface):
"""
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.
"""
options = Interface.options + \
['tunnel_id', 'peer_tunnel_id', 'local_port', 'remote_port',
'encapsulation', 'local_address', 'remote_address']
default = {
'type': 'l2tp',
}
def _create(self):
# create tunnel interface
cmd = 'ip l2tp add tunnel tunnel_id {} '.format(config['tunnel_id'])
cmd += 'peer_tunnel_id {} '.format(config['peer_tunnel_id'])
cmd += 'udp_sport {} '.format(config['local_port'])
cmd += 'udp_dport {} '.format(config['remote_port'])
cmd += 'encap {} '.format(config['encapsulation'])
cmd += 'local {} '.format(config['local_address'])
cmd += 'remote {} '.format(config['remote_address'])
self._cmd(cmd)
# setup session
cmd = 'ip l2tp add session name {} '.format(self.config['ifname'])
cmd += 'tunnel_id {} '.format(config['tunnel_id'])
cmd += 'session_id {} '.format(config['session_id'])
cmd += 'peer_session_id {} '.format(config['peer_session_id'])
self._cmd(cmd)
# interface is always A/D down. It needs to be enabled explicitly
self.set_state('down')
def remove(self):
"""
Remove interface from operating system. Removing the interface
deconfigures all assigned IP addresses.
Example:
>>> from vyos.ifconfig import L2TPv3If
>>> i = L2TPv3If('l2tpeth0')
>>> i.remove()
"""
if os.path.exists('/sys/class/net/{}'.format(self.config['ifname'])):
# interface is always A/D down. It needs to be enabled explicitly
self.set_state('down')
if self._config['tunnel_id'] and self._config['session_id']:
cmd = 'ip l2tp del session tunnel_id {} '.format(
self._config['tunnel_id'])
cmd += 'session_id {} '.format(self._config['session_id'])
self._cmd(cmd)
if self._config['tunnel_id']:
cmd = 'ip l2tp del tunnel tunnel_id {} '.format(
self._config['tunnel_id'])
self._cmd(cmd)
@staticmethod
def get_config():
"""
L2TPv3 interfaces require a configuration when they are added using
iproute2. This static method will provide the configuration dictionary
used by this class.
Example:
>> dict = L2TPv3If().get_config()
"""
config = {
'peer_tunnel_id': '',
'local_port': 0,
'remote_port': 0,
'encapsulation': 'udp',
'local_address': '',
'remote_address': '',
'session_id': '',
'tunnel_id': '',
'peer_session_id': ''
}
return config

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