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
|
#!/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 vyos.config import Config
from vyos import ConfigError
from vyos.util import call
from vyos.template import render
from vyos import airbag
airbag.enable()
config_file = r'/tmp/ldpd.frr'
def sysctl(name, value):
call('sysctl -wq {}={}'.format(name, value))
def get_config():
conf = Config()
mpls_conf = {
'router_id' : None,
'mpls_ldp' : False,
'old_ldp' : {
'interfaces' : [],
'neighbors' : {},
'd_transp_ipv4' : None,
'd_transp_ipv6' : None,
'hello_holdtime' : None,
'hello_interval' : None
},
'ldp' : {
'interfaces' : [],
'neighbors' : {},
'd_transp_ipv4' : None,
'd_transp_ipv6' : None,
'hello_holdtime' : None,
'hello_interval' : None
}
}
if not (conf.exists('protocols mpls') or conf.exists_effective('protocols mpls')):
return None
if conf.exists('protocols mpls ldp'):
mpls_conf['mpls_ldp'] = True
conf.set_level('protocols mpls ldp')
# Get router-id
if conf.exists_effective('router-id'):
mpls_conf['old_router_id'] = conf.return_effective_value('router-id')
if conf.exists('router-id'):
mpls_conf['router_id'] = conf.return_value('router-id')
# Get hello holdtime
if conf.exists_effective('discovery hello-holdtime'):
mpls_conf['old_ldp']['hello_holdtime'] = conf.return_effective_value('discovery hello-holdtime')
if conf.exists('discovery hello-holdtime'):
mpls_conf['ldp']['hello_holdtime'] = conf.return_value('discovery hello-holdtime')
# Get hello interval
if conf.exists_effective('discovery hello-interval'):
mpls_conf['old_ldp']['hello_interval'] = conf.return_effective_value('discovery hello-interval')
if conf.exists('discovery hello-interval'):
mpls_conf['ldp']['hello_interval'] = conf.return_value('discovery hello-interval')
# Get discovery transport-ipv4-address
if conf.exists_effective('discovery transport-ipv4-address'):
mpls_conf['old_ldp']['d_transp_ipv4'] = conf.return_effective_value('discovery transport-ipv4-address')
if conf.exists('discovery transport-ipv4-address'):
mpls_conf['ldp']['d_transp_ipv4'] = conf.return_value('discovery transport-ipv4-address')
# Get discovery transport-ipv6-address
if conf.exists_effective('discovery transport-ipv6-address'):
mpls_conf['old_ldp']['d_transp_ipv6'] = conf.return_effective_value('discovery transport-ipv6-address')
if conf.exists('discovery transport-ipv6-address'):
mpls_conf['ldp']['d_transp_ipv6'] = conf.return_value('discovery transport-ipv6-address')
# Get interfaces
if conf.exists_effective('interface'):
mpls_conf['old_ldp']['interfaces'] = conf.return_effective_values('interface')
if conf.exists('interface'):
mpls_conf['ldp']['interfaces'] = conf.return_values('interface')
# Get neighbors
for neighbor in conf.list_effective_nodes('neighbor'):
mpls_conf['old_ldp']['neighbors'].update({
neighbor : {
'password' : conf.return_effective_value('neighbor {0} password'.format(neighbor))
}
})
for neighbor in conf.list_nodes('neighbor'):
mpls_conf['ldp']['neighbors'].update({
neighbor : {
'password' : conf.return_value('neighbor {0} password'.format(neighbor))
}
})
return mpls_conf
def operate_mpls_on_intfc(interfaces, action):
rp_filter = 0
if action == 1:
rp_filter = 2
for iface in interfaces:
sysctl('net.mpls.conf.{0}.input'.format(iface), action)
# Operate rp filter
sysctl('net.ipv4.conf.{0}.rp_filter'.format(iface), rp_filter)
def verify(mpls):
if mpls is None:
return None
if mpls['mpls_ldp']:
# Requre router-id
if not mpls['router_id']:
raise ConfigError(f"MPLS ldp router-id is mandatory!")
# Requre discovery transport-address
if not mpls['ldp']['d_transp_ipv4'] and not mpls['ldp']['d_transp_ipv6']:
raise ConfigError(f"MPLS ldp discovery transport address is mandatory!")
# Requre interface
if not mpls['ldp']['interfaces']:
raise ConfigError(f"MPLS ldp interface is mandatory!")
def generate(mpls):
if mpls is None:
return None
render(config_file, 'frr/ldpd.frr.tmpl', mpls)
return None
def apply(mpls):
if mpls is None:
return None
# Set number of entries in the platform label table
if mpls['mpls_ldp']:
sysctl('net.mpls.platform_labels', '1048575')
else:
sysctl('net.mpls.platform_labels', '0')
# Do not copy IP TTL to MPLS header
sysctl('net.mpls.ip_ttl_propagate', '0')
# Allow mpls on interfaces
operate_mpls_on_intfc(mpls['ldp']['interfaces'], 1)
# Disable mpls on deleted interfaces
diactive_ifaces = set(mpls['old_ldp']['interfaces']).difference(mpls['ldp']['interfaces'])
operate_mpls_on_intfc(diactive_ifaces, 0)
if os.path.exists(config_file):
call(f'vtysh -d ldpd -f {config_file}')
os.remove(config_file)
return None
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)
|
