diff options
Diffstat (limited to 'src/conf_mode')
| -rwxr-xr-x | src/conf_mode/interfaces-l2tpv3.py | 228 |
1 files changed, 228 insertions, 0 deletions
diff --git a/src/conf_mode/interfaces-l2tpv3.py b/src/conf_mode/interfaces-l2tpv3.py new file mode 100755 index 000000000..62d802b39 --- /dev/null +++ b/src/conf_mode/interfaces-l2tpv3.py @@ -0,0 +1,228 @@ +#!/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 + 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): + # Check if L2TPv3 interface already exists + if l2tpv3['intf'] in interfaces(): + l = L2TPv3If(l2tpv3['intf']) + # L2TPv3 is super picky and the tunnel always needs to be recreated, + # thus we can simply always delete it first. + l.remove() + + + if not l2tpv3['deleted']: + # L2TPv3 interface needs to be created 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()) + + 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'], config=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) |