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
|
#!/usr/bin/env python3
#
# Copyright (C) 2018-2023 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
import time
from sys import exit
from ipaddress import ip_interface
from ipaddress import IPv4Interface
from ipaddress import IPv6Interface
from vyos.base import Warning
from vyos.config import Config
from vyos.configdict import leaf_node_changed
from vyos.ifconfig.vrrp import VRRP
from vyos.template import render
from vyos.template import is_ipv4
from vyos.template import is_ipv6
from vyos.utils.network import is_ipv6_tentative
from vyos.utils.process import call
from vyos import ConfigError
from vyos import airbag
airbag.enable()
systemd_override = r'/run/systemd/system/keepalived.service.d/10-override.conf'
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
base = ['high-availability']
if not conf.exists(base):
return None
ha = conf.get_config_dict(base, key_mangling=('-', '_'),
no_tag_node_value_mangle=True,
get_first_key=True, with_defaults=True)
## Get the sync group used for conntrack-sync
conntrack_path = ['service', 'conntrack-sync', 'failover-mechanism', 'vrrp', 'sync-group']
if conf.exists(conntrack_path):
ha['conntrack_sync_group'] = conf.return_value(conntrack_path)
if leaf_node_changed(conf, base + ['vrrp', 'snmp']):
ha.update({'restart_required': {}})
return ha
def verify(ha):
if not ha or 'disable' in ha:
return None
used_vrid_if = []
if 'vrrp' in ha and 'group' in ha['vrrp']:
for group, group_config in ha['vrrp']['group'].items():
# Check required fields
if 'vrid' not in group_config:
raise ConfigError(f'VRID is required but not set in VRRP group "{group}"')
if 'interface' not in group_config:
raise ConfigError(f'Interface is required but not set in VRRP group "{group}"')
if 'address' not in group_config:
raise ConfigError(f'Virtual IP address is required but not set in VRRP group "{group}"')
if 'authentication' in group_config:
if not {'password', 'type'} <= set(group_config['authentication']):
raise ConfigError(f'Authentication requires both type and passwortd to be set in VRRP group "{group}"')
if 'health_check' in group_config:
_validate_health_check(group, group_config)
# Keepalived doesn't allow mixing IPv4 and IPv6 in one group, so we mirror that restriction
# We also need to make sure VRID is not used twice on the same interface with the
# same address family.
interface = group_config['interface']
vrid = group_config['vrid']
# XXX: filter on map object is destructive, so we force it to list.
# Additionally, filter objects always evaluate to True, empty or not,
# so we force them to lists as well.
vaddrs = list(map(lambda i: ip_interface(i), group_config['address']))
vaddrs4 = list(filter(lambda x: isinstance(x, IPv4Interface), vaddrs))
vaddrs6 = list(filter(lambda x: isinstance(x, IPv6Interface), vaddrs))
if vaddrs4 and vaddrs6:
raise ConfigError(f'VRRP group "{group}" mixes IPv4 and IPv6 virtual addresses, this is not allowed.\n' \
'Create individual groups for IPv4 and IPv6!')
if vaddrs4:
tmp = {'interface': interface, 'vrid': vrid, 'ipver': 'IPv4'}
if tmp in used_vrid_if:
raise ConfigError(f'VRID "{vrid}" can only be used once on interface "{interface} with address family IPv4"!')
used_vrid_if.append(tmp)
if 'hello_source_address' in group_config:
if is_ipv6(group_config['hello_source_address']):
raise ConfigError(f'VRRP group "{group}" uses IPv4 but hello-source-address is IPv6!')
if 'peer_address' in group_config:
if is_ipv6(group_config['peer_address']):
raise ConfigError(f'VRRP group "{group}" uses IPv4 but peer-address is IPv6!')
if vaddrs6:
tmp = {'interface': interface, 'vrid': vrid, 'ipver': 'IPv6'}
if tmp in used_vrid_if:
raise ConfigError(f'VRID "{vrid}" can only be used once on interface "{interface} with address family IPv6"!')
used_vrid_if.append(tmp)
if 'hello_source_address' in group_config:
if is_ipv4(group_config['hello_source_address']):
raise ConfigError(f'VRRP group "{group}" uses IPv6 but hello-source-address is IPv4!')
if 'peer_address' in group_config:
if is_ipv4(group_config['peer_address']):
raise ConfigError(f'VRRP group "{group}" uses IPv6 but peer-address is IPv4!')
# Check sync groups
if 'vrrp' in ha and 'sync_group' in ha['vrrp']:
for sync_group, sync_config in ha['vrrp']['sync_group'].items():
if 'health_check' in sync_config:
_validate_health_check(sync_group, sync_config)
if 'member' in sync_config:
for member in sync_config['member']:
if member not in ha['vrrp']['group']:
raise ConfigError(f'VRRP sync-group "{sync_group}" refers to VRRP group "{member}", '\
'but it does not exist!')
else:
ha['vrrp']['group'][member]['_is_sync_group_member'] = True
if ha['vrrp']['group'][member].get('health_check') is not None:
raise ConfigError(
f'Health check configuration for VRRP group "{member}" will remain unused '
f'while it has member of sync group "{sync_group}" '
f'Only sync group health check will be used'
)
# Virtual-server
if 'virtual_server' in ha:
for vs, vs_config in ha['virtual_server'].items():
if 'address' not in vs_config and 'fwmark' not in vs_config:
raise ConfigError('Either address or fwmark is required '
f'but not set for virtual-server "{vs}"')
if 'port' not in vs_config and 'fwmark' not in vs_config:
raise ConfigError(f'Port or fwmark is required but not set for virtual-server "{vs}"')
if 'port' in vs_config and 'fwmark' in vs_config:
raise ConfigError(f'Cannot set both port and fwmark for virtual-server "{vs}"')
if 'real_server' not in vs_config:
raise ConfigError(f'Real-server ip is required but not set for virtual-server "{vs}"')
# Real-server
for rs, rs_config in vs_config['real_server'].items():
if 'port' not in rs_config:
raise ConfigError(f'Port is required but not set for virtual-server "{vs}" real-server "{rs}"')
def _validate_health_check(group, group_config):
health_check_types = ["script", "ping"]
from vyos.utils.dict import check_mutually_exclusive_options
try:
check_mutually_exclusive_options(group_config["health_check"],
health_check_types, required=True)
except ValueError:
Warning(
f'Health check configuration for VRRP group "{group}" will remain unused ' \
f'until it has one of the following options: {health_check_types}')
# XXX: health check has default options so we need to remove it
# to avoid generating useless config statements in keepalived.conf
del group_config["health_check"]
def generate(ha):
if not ha or 'disable' in ha:
if os.path.isfile(systemd_override):
os.unlink(systemd_override)
return None
render(VRRP.location['config'], 'high-availability/keepalived.conf.j2', ha)
render(systemd_override, 'high-availability/10-override.conf.j2', ha)
return None
def apply(ha):
service_name = 'keepalived.service'
call('systemctl daemon-reload')
if not ha or 'disable' in ha:
call(f'systemctl stop {service_name}')
return None
# Check if IPv6 address is tentative T5533
for group, group_config in ha.get('vrrp', {}).get('group', {}).items():
if 'hello_source_address' in group_config:
if is_ipv6(group_config['hello_source_address']):
ipv6_address = group_config['hello_source_address']
interface = group_config['interface']
checks = 20
interval = 0.1
for _ in range(checks):
if is_ipv6_tentative(interface, ipv6_address):
time.sleep(interval)
systemd_action = 'reload-or-restart'
if 'restart_required' in ha:
systemd_action = 'restart'
call(f'systemctl {systemd_action} {service_name}')
return None
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)
|
