1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
#!/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': '',
'ipv6_autoconf': 0,
'ipv6_forwarding': 1,
'ipv6_dup_addr_detect': 1,
'mtu': 1488,
'peer_session_id': '',
'peer_tunnel_id': '',
'remote_address': '',
'remote_port': 5000,
'session_id': '',
'tunnel_id': ''
}
def check_kmod():
modules = ['l2tp_eth', 'l2tp_netlink', 'l2tp_ip', 'l2tp_ip6']
for module in modules:
if not os.path.exists(f'/sys/module/{module}'):
if os.system(f'modprobe {module}') != 0:
raise ConfigError(f'Loading Kernel module {module} failed')
def get_config():
l2tpv3 = deepcopy(default_config_data)
conf = Config()
# determine tagNode instance
if 'VYOS_TAGNODE_VALUE' not in os.environ:
raise ConfigError('Interface (VYOS_TAGNODE_VALUE) not specified')
l2tpv3['intf'] = os.environ['VYOS_TAGNODE_VALUE']
# 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
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')
# Enable acquisition of IPv6 address using stateless autoconfig (SLAAC)
if conf.exists('ipv6 address autoconf'):
l2tpv3['ipv6_autoconf'] = 1
# Disable IPv6 forwarding on this interface
if conf.exists('ipv6 disable-forwarding'):
l2tpv3['ipv6_forwarding'] = 0
# IPv6 Duplicate Address Detection (DAD) tries
if conf.exists('ipv6 dup-addr-detect-transmits'):
l2tpv3['ipv6_dup_addr_detect'] = int(conf.return_value('ipv6 dup-addr-detect-transmits'))
# 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):
return None
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():
# 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'], **conf)
l.remove()
if not l2tpv3['deleted']:
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'], **conf)
# update interface description used e.g. by SNMP
l.set_alias(l2tpv3['description'])
# Maximum Transfer Unit (MTU)
l.set_mtu(l2tpv3['mtu'])
# IPv6 address autoconfiguration
l.set_ipv6_autoconf(l2tpv3['ipv6_autoconf'])
# IPv6 forwarding
l.set_ipv6_forwarding(l2tpv3['ipv6_forwarding'])
# IPv6 Duplicate Address Detection (DAD) tries
l.set_ipv6_dad_messages(l2tpv3['ipv6_dup_addr_detect'])
# 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_admin_state('up')
return None
if __name__ == '__main__':
try:
check_kmod()
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)
|
