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service_conntrack-sync.py
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service_conntrack-sync.py
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#!/usr/bin/env python3
#
# Copyright (C) 2021 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 vyos.config import Config
from vyos.configverify import verify_interface_exists
from vyos.utils.dict import dict_search
from vyos.utils.process import process_named_running
from vyos.utils.file import read_file
from vyos.utils.process import call
from vyos.utils.process import run
from vyos.template import render
from vyos.template import get_ipv4
from vyos.utils.network import is_addr_assigned
from vyos import ConfigError
from vyos import airbag
airbag.enable()
config_file = '/run/conntrackd/conntrackd.conf'
def resync_vrrp():
tmp = run('/usr/libexec/vyos/conf_mode/high-availability.py')
if tmp > 0:
print('ERROR: error restarting VRRP daemon!')
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
base = ['service', 'conntrack-sync']
if not conf.exists(base):
return None
conntrack = conf.get_config_dict(base, key_mangling=('-', '_'),
get_first_key=True, with_defaults=True)
conntrack['hash_size'] = read_file('/sys/module/nf_conntrack/parameters/hashsize')
conntrack['table_size'] = read_file('/proc/sys/net/netfilter/nf_conntrack_max')
conntrack['vrrp'] = conf.get_config_dict(['high-availability', 'vrrp', 'sync-group'],
get_first_key=True)
return conntrack
def verify(conntrack):
if not conntrack:
return None
if 'interface' not in conntrack:
raise ConfigError('Interface not defined!')
has_peer = False
for interface, interface_config in conntrack['interface'].items():
verify_interface_exists(interface)
# Interface must not only exist, it must also carry an IP address
if len(get_ipv4(interface)) < 1:
raise ConfigError(f'Interface {interface} requires an IP address!')
if 'peer' in interface_config:
has_peer = True
# If one interface runs in unicast mode instead of multicast, so must all the
# others, else conntrackd will error out with: "cannot use UDP with other
# dedicated link protocols"
if has_peer:
for interface, interface_config in conntrack['interface'].items():
if 'peer' not in interface_config:
raise ConfigError('Can not mix unicast and multicast mode!')
if 'expect_sync' in conntrack:
if len(conntrack['expect_sync']) > 1 and 'all' in conntrack['expect_sync']:
raise ConfigError('Can not configure expect-sync "all" with other protocols!')
if 'listen_address' in conntrack:
for address in conntrack['listen_address']:
if not is_addr_assigned(address):
raise ConfigError(f'Specified listen-address {address} not assigned to any interface!')
vrrp_group = dict_search('failover_mechanism.vrrp.sync_group', conntrack)
if vrrp_group == None:
raise ConfigError(f'No VRRP sync-group defined!')
if vrrp_group not in conntrack['vrrp']:
raise ConfigError(f'VRRP sync-group {vrrp_group} not configured!')
return None
def generate(conntrack):
if not conntrack:
if os.path.isfile(config_file):
os.unlink(config_file)
return None
render(config_file, 'conntrackd/conntrackd.conf.j2', conntrack)
return None
def apply(conntrack):
systemd_service = 'conntrackd.service'
if not conntrack:
# Failover mechanism daemon should be indicated that it no longer needs
# to execute conntrackd actions on transition. This is only required
# once when conntrackd is stopped and taken out of service!
if process_named_running('conntrackd'):
resync_vrrp()
call(f'systemctl stop {systemd_service}')
return None
# Failover mechanism daemon should be indicated that it needs to execute
# conntrackd actions on transition. This is only required once when conntrackd
# is started the first time!
if not process_named_running('conntrackd'):
resync_vrrp()
call(f'systemctl reload-or-restart {systemd_service}')
return None
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)

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