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
242
243
244
245
246
247
248
249
250
251
252
253
|
#!/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 copy import deepcopy
from sys import exit
from netifaces import interfaces
from vyos.ifconfig import BridgeIf, Interface
from vyos.configdict import list_diff
from vyos.config import Config
from vyos import ConfigError
default_config_data = {
'address': [],
'address_remove': [],
'aging': 300,
'arp_cache_tmo': 30,
'description': '',
'deleted': False,
'disable': False,
'disable_link_detect': 1,
'forwarding_delay': 14,
'hello_time': 2,
'igmp_querier': 0,
'intf': '',
'mac' : '',
'max_age': 20,
'member': [],
'member_remove': [],
'priority': 32768,
'stp': 0
}
def get_config():
bridge = deepcopy(default_config_data)
conf = Config()
# determine tagNode instance
try:
bridge['intf'] = os.environ['VYOS_TAGNODE_VALUE']
except KeyError as E:
print("Interface not specified")
# Check if bridge has been removed
if not conf.exists('interfaces bridge ' + bridge['intf']):
bridge['deleted'] = True
return bridge
# set new configuration level
conf.set_level('interfaces bridge ' + bridge['intf'])
# retrieve configured interface addresses
if conf.exists('address'):
bridge['address'] = conf.return_values('address')
# Determine interface addresses (currently effective) - to determine which
# address is no longer valid and needs to be removed
eff_addr = conf.return_effective_values('address')
bridge['address_remove'] = list_diff(eff_addr, bridge['address'])
# retrieve aging - how long addresses are retained
if conf.exists('aging'):
bridge['aging'] = int(conf.return_value('aging'))
# retrieve interface description
if conf.exists('description'):
bridge['description'] = conf.return_value('description')
# Disable this bridge interface
if conf.exists('disable'):
bridge['disable'] = True
# Ignore link state changes
if conf.exists('disable-link-detect'):
bridge['disable_link_detect'] = 2
# Forwarding delay
if conf.exists('forwarding-delay'):
bridge['forwarding_delay'] = int(conf.return_value('forwarding-delay'))
# Hello packet advertisment interval
if conf.exists('hello-time'):
bridge['hello_time'] = int(conf.return_value('hello-time'))
# Enable Internet Group Management Protocol (IGMP) querier
if conf.exists('igmp querier'):
bridge['igmp_querier'] = 1
# ARP cache entry timeout in seconds
if conf.exists('ip arp-cache-timeout'):
bridge['arp_cache_tmo'] = int(conf.return_value('ip arp-cache-timeout'))
# Media Access Control (MAC) address
if conf.exists('mac'):
bridge['mac'] = conf.return_value('mac')
# Interval at which neighbor bridges are removed
if conf.exists('max-age'):
bridge['max_age'] = int(conf.return_value('max-age'))
# Determine bridge member interface (currently configured)
for intf in conf.list_nodes('member interface'):
# cost and priority initialized with linux defaults
# by reading /sys/devices/virtual/net/br0/brif/eth2/{path_cost,priority}
# after adding interface to bridge after reboot
iface = {
'name': intf,
'cost': 100,
'priority': 32
}
if conf.exists('member interface {} cost'.format(intf)):
iface['cost'] = int(conf.return_value('member interface {} cost'.format(intf)))
if conf.exists('member interface {} priority'.format(intf)):
iface['priority'] = int(conf.return_value('member interface {} priority'.format(intf)))
bridge['member'].append(iface)
# Determine bridge member interface (currently effective) - to determine which
# interfaces is no longer assigend to the bridge and thus can be removed
eff_intf = conf.list_effective_nodes('member interface')
act_intf = conf.list_nodes('member interface')
bridge['member_remove'] = list_diff(eff_intf, act_intf)
# Priority for this bridge
if conf.exists('priority'):
bridge['priority'] = int(conf.return_value('priority'))
# Enable spanning tree protocol
if conf.exists('stp'):
bridge['stp'] = 1
return bridge
def verify(bridge):
conf = Config()
for br in conf.list_nodes('interfaces bridge'):
# it makes no sense to verify ourself in this case
if br == bridge['intf']:
continue
for intf in bridge['member']:
tmp = conf.list_nodes('interfaces bridge {} member interface'.format(br))
if intf['name'] in tmp:
raise ConfigError('Interface "{}" belongs to bridge "{}" and can not be enslaved.'.format(intf['name'], bridge['intf']))
# the interface must exist prior adding it to a bridge
for intf in bridge['member']:
if intf['name'] not in interfaces():
raise ConfigError('Can not add non existing interface "{}" to bridge "{}"'.format(intf['name'], bridge['intf']))
# bridge members are not allowed to be bond members, too
for intf in bridge['member']:
for bond in conf.list_nodes('interfaces bonding'):
if conf.exists('interfaces bonding ' + bond + ' member interface'):
if intf['name'] in conf.return_values('interfaces bonding ' + bond + ' member interface'):
raise ConfigError('Interface {} belongs to bond {}, can not add it to {}'.format(intf['name'], bond, bridge['intf']))
return None
def generate(bridge):
return None
def apply(bridge):
br = BridgeIf(bridge['intf'])
if bridge['deleted']:
# delete interface
br.remove()
else:
# enable interface
br.state = 'up'
# set ageing time
br.ageing_time = bridge['aging']
# set bridge forward delay
br.set_forward_delay(bridge['forwarding_delay'])
# set hello time
br.set_hello_time(bridge['hello_time'])
# set max message age
br.set_max_age(bridge['max_age'])
# set bridge priority
br.priority = bridge['priority']
# turn stp on/off
br.stp_state = bridge['stp']
# enable or disable IGMP querier
br.set_multicast_querier(bridge['igmp_querier'])
# update interface description used e.g. within SNMP
br.ifalias = bridge['description']
# Change interface MAC address
if bridge['mac']:
br.set_mac(bridge['mac'])
# remove interface from bridge
for intf in bridge['member_remove']:
br.del_port( intf['name'] )
# add interfaces to bridge
for member in bridge['member']:
br.add_port(member['name'])
# up/down interface
if bridge['disable']:
br.state = 'down'
# Configure interface address(es)
# - not longer required addresses get removed first
# - newly addresses will be added second
for addr in bridge['address_remove']:
br.del_addr(addr)
for addr in bridge['address']:
br.add_addr(addr)
# configure additional bridge member options
for member in bridge['member']:
# set bridge port cost
br.set_cost(member['name'], member['cost'])
# set bridge port priority
br.set_priority(member['name'], member['priority'])
i = Interface(member['name'])
# configure ARP cache timeout
i.arp_cache_tmo = bridge['arp_cache_tmo']
# ignore link state changes
i.link_detect = bridge['disable_link_detect']
return None
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)
|
