From db658825c7bb17e3221474e22b78306dc3edd2df Mon Sep 17 00:00:00 2001 From: Christian Poessinger Date: Tue, 31 Dec 2019 12:36:53 +0100 Subject: l2tpv3: T1923: implementation in XML/Python Tested using: R1: --- set interfaces l2tpv3 l2tpeth10 address '2001:db8:beef::1/64' set interfaces l2tpv3 l2tpeth10 address '100.0.0.1/24' set interfaces l2tpv3 l2tpeth10 destination-port '3000' set interfaces l2tpv3 l2tpeth10 encapsulation 'udp' set interfaces l2tpv3 l2tpeth10 local-ip '172.18.201.10' set interfaces l2tpv3 l2tpeth10 peer-session-id '10' set interfaces l2tpv3 l2tpeth10 peer-tunnel-id '100' set interfaces l2tpv3 l2tpeth10 remote-ip '172.18.204.10' set interfaces l2tpv3 l2tpeth10 session-id '20' set interfaces l2tpv3 l2tpeth10 source-port '6000' set interfaces l2tpv3 l2tpeth10 tunnel-id '200' R2: --- set interfaces l2tpv3 l2tpeth10 address '2001:db8:beef::2/64' set interfaces l2tpv3 l2tpeth10 address '100.0.0.2/24' set interfaces l2tpv3 l2tpeth10 destination-port '6000' set interfaces l2tpv3 l2tpeth10 encapsulation 'udp' set interfaces l2tpv3 l2tpeth10 local-ip '172.18.204.10' set interfaces l2tpv3 l2tpeth10 peer-session-id '20' set interfaces l2tpv3 l2tpeth10 peer-tunnel-id '200' set interfaces l2tpv3 l2tpeth10 remote-ip '172.18.201.10' set interfaces l2tpv3 l2tpeth10 session-id '10' set interfaces l2tpv3 l2tpeth10 source-port '3000' set interfaces l2tpv3 l2tpeth10 tunnel-id '100' --- src/conf_mode/interfaces-l2tpv3.py | 228 +++++++++++++++++++++++++++++++++++++ 1 file changed, 228 insertions(+) create mode 100755 src/conf_mode/interfaces-l2tpv3.py (limited to 'src/conf_mode/interfaces-l2tpv3.py') 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 . + +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) -- cgit v1.2.3 From 4ebe0e002208b67dd4720a3fa8569557232df7e5 Mon Sep 17 00:00:00 2001 From: Christian Poessinger Date: Tue, 31 Dec 2019 13:04:59 +0100 Subject: l2tpv3: T1923: support interface deletion --- python/vyos/ifconfig.py | 14 ++++++++++---- src/conf_mode/interfaces-l2tpv3.py | 29 ++++++++++++++++++++--------- 2 files changed, 30 insertions(+), 13 deletions(-) (limited to 'src/conf_mode/interfaces-l2tpv3.py') diff --git a/python/vyos/ifconfig.py b/python/vyos/ifconfig.py index 1c5a7cd14..36bd8c57c 100644 --- a/python/vyos/ifconfig.py +++ b/python/vyos/ifconfig.py @@ -1714,8 +1714,10 @@ class L2TPv3If(Interface): monitoring may be performed. """ def __init__(self, ifname, config=''): + self._config = {} if config: self._ifname = ifname + self._config = config if not os.path.exists('/sys/class/net/{}'.format(self._ifname)): # create tunnel interface cmd = 'ip l2tp add tunnel tunnel_id {} '.format(config['tunnel_id']) @@ -1729,7 +1731,7 @@ class L2TPv3If(Interface): # setup session cmd = 'ip l2tp add session name {} '.format(self._ifname) - cmd += 'tunnel_id {} '.format(config['tunnel_id']) + 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) @@ -1753,10 +1755,14 @@ class L2TPv3If(Interface): # interface is always A/D down. It needs to be enabled explicitly self.set_state('down') - #cmd = 'ip l2tp add tunnel tunnel_id {} '.format(config['tunnel_id']) + 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) - # call remove of parent class - super().remove() + if self._config['tunnel_id']: + cmd = 'ip l2tp del tunnel tunnel_id {} '.format(self._config['tunnel_id']) + self._cmd(cmd) @staticmethod def get_config(): diff --git a/src/conf_mode/interfaces-l2tpv3.py b/src/conf_mode/interfaces-l2tpv3.py index 62d802b39..ae49dadad 100755 --- a/src/conf_mode/interfaces-l2tpv3.py +++ b/src/conf_mode/interfaces-l2tpv3.py @@ -55,6 +55,16 @@ def get_config(): # 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 @@ -172,20 +182,21 @@ def generate(l2tpv3): 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(): - l = L2TPv3If(l2tpv3['intf']) - # L2TPv3 is super picky and the tunnel always needs to be recreated, - # thus we can simply always delete it first. + # 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'], config=conf) 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'] -- cgit v1.2.3