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l2tpv3.py
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l2tpv3.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 vyos.ifconfig.interface import Interface
@Interface.register
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.
"""
iftype = 'l2tp'
definition = {
**Interface.definition,
**{
'section': 'l2tpeth',
'prefixes': ['l2tpeth', ],
'bridgeable': True,
}
}
def _create(self):
# create tunnel interface
cmd = 'ip l2tp add tunnel tunnel_id {tunnel_id}'
cmd += ' peer_tunnel_id {peer_tunnel_id}'
cmd += ' udp_sport {source_port}'
cmd += ' udp_dport {destination_port}'
cmd += ' encap {encapsulation}'
cmd += ' local {local_ip}'
cmd += ' remote {remote_ip}'
self._cmd(cmd.format(**self.config))
# setup session
cmd = 'ip l2tp add session name {ifname}'
cmd += ' tunnel_id {tunnel_id}'
cmd += ' session_id {session_id}'
cmd += ' peer_session_id {peer_session_id}'
self._cmd(cmd.format(**self.config))
# No need for interface shut down. There exist no function to permanently enable tunnel.
# But you can disable interface permanently with shutdown/disable command.
self.set_admin_state('up')
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 self.exists(self.ifname):
# interface is always A/D down. It needs to be enabled explicitly
self.set_admin_state('down')
if {'tunnel_id', 'session_id'} <= set(self.config):
cmd = 'ip l2tp del session tunnel_id {tunnel_id}'
cmd += ' session_id {session_id}'
self._cmd(cmd.format(**self.config))
if 'tunnel_id' in self.config:
cmd = 'ip l2tp del tunnel tunnel_id {tunnel_id}'
self._cmd(cmd.format(**self.config))
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. """
# call base class first
super().update(config)
# 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)

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