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#!/usr/bin/env python3
#
# Copyright (C) 2019-2020 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 netifaces import interfaces
from vyos.config import Config
from vyos.configdict import get_interface_dict
from vyos.configdict import leaf_node_changed
from vyos.configverify import verify_address
from vyos.configverify import verify_bridge_delete
from vyos.configverify import verify_mtu_ipv6
from vyos.configverify import verify_redirect
from vyos.ifconfig import L2TPv3If
from vyos.util import check_kmod
from vyos.validate import is_addr_assigned
from vyos import ConfigError
from vyos import airbag
airbag.enable()
k_mod = ['l2tp_eth', 'l2tp_netlink', 'l2tp_ip', 'l2tp_ip6']
def get_config(config=None):
"""
Retrive CLI config as dictionary. Dictionary can never be empty, as at least the
interface name will be added or a deleted flag
"""
if config:
conf = config
else:
conf = Config()
base = ['interfaces', 'l2tpv3']
l2tpv3 = get_interface_dict(conf, base)
# To delete an l2tpv3 interface we need the current tunnel and session-id
if 'deleted' in l2tpv3:
tmp = leaf_node_changed(conf, ['tunnel-id'])
# leaf_node_changed() returns a list
l2tpv3.update({'tunnel_id': tmp[0]})
tmp = leaf_node_changed(conf, ['session-id'])
l2tpv3.update({'session_id': tmp[0]})
return l2tpv3
def verify(l2tpv3):
if 'deleted' in l2tpv3:
verify_bridge_delete(l2tpv3)
return None
interface = l2tpv3['ifname']
for key in ['source_address', 'remote', 'tunnel_id', 'peer_tunnel_id',
'session_id', 'peer_session_id']:
if key not in l2tpv3:
tmp = key.replace('_', '-')
raise ConfigError(f'Missing mandatory L2TPv3 option: "{tmp}"!')
if not is_addr_assigned(l2tpv3['source_address']):
raise ConfigError('L2TPv3 source-address address "{source_address}" '
'not configured on any interface!'.format(**l2tpv3))
verify_mtu_ipv6(l2tpv3)
verify_address(l2tpv3)
verify_redirect(l2tpv3)
return None
def generate(l2tpv3):
return None
def apply(l2tpv3):
# Check if L2TPv3 interface already exists
if l2tpv3['ifname'] in interfaces():
# L2TPv3 is picky when changing tunnels/sessions, thus we can simply
# always delete it first.
l = L2TPv3If(**l2tpv3)
l.remove()
if 'deleted' not in l2tpv3:
# Finally create the new interface
l = L2TPv3If(**l2tpv3)
l.update(l2tpv3)
return None
if __name__ == '__main__':
try:
check_kmod(k_mod)
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)
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