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authorChristian Poessinger <christian@poessinger.com>2022-12-17 08:11:26 +0100
committerGitHub <noreply@github.com>2022-12-17 08:11:26 +0100
commitc44cd46619ba8e765ad312cc2710fa3ea04f21ae (patch)
tree6e84dad0c08c49ab95b89359ea4e9327772b3e52 /src
parent28c7960b6cc9bb05fafb0f2b8659b169b13c0071 (diff)
parent932af7f098808009f626c788deb9e1d1c8bf3426 (diff)
downloadvyos-1x-c44cd46619ba8e765ad312cc2710fa3ea04f21ae.tar.gz
vyos-1x-c44cd46619ba8e765ad312cc2710fa3ea04f21ae.zip
Merge pull request #1358 from sever-sever/T1237
routing: T1237: Add new feature failover route
Diffstat (limited to 'src')
-rwxr-xr-xsrc/conf_mode/protocols_failover.py121
-rwxr-xr-xsrc/helpers/vyos-failover.py184
2 files changed, 305 insertions, 0 deletions
diff --git a/src/conf_mode/protocols_failover.py b/src/conf_mode/protocols_failover.py
new file mode 100755
index 000000000..048ba7a89
--- /dev/null
+++ b/src/conf_mode/protocols_failover.py
@@ -0,0 +1,121 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2022 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 json
+
+from pathlib import Path
+
+from vyos.config import Config
+from vyos.configdict import dict_merge
+from vyos.template import render
+from vyos.util import call
+from vyos.xml import defaults
+from vyos import ConfigError
+from vyos import airbag
+
+airbag.enable()
+
+
+service_name = 'vyos-failover'
+service_conf = Path(f'/run/{service_name}.conf')
+systemd_service = '/etc/systemd/system/vyos-failover.service'
+rt_proto_failover = '/etc/iproute2/rt_protos.d/failover.conf'
+
+
+def get_config(config=None):
+ if config:
+ conf = config
+ else:
+ conf = Config()
+
+ base = ['protocols', 'failover']
+ failover = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True)
+
+ # Set default values only if we set config
+ if failover.get('route'):
+ for route, route_config in failover.get('route').items():
+ for next_hop, next_hop_config in route_config.get('next_hop').items():
+ default_values = defaults(base + ['route'])
+ failover['route'][route]['next_hop'][next_hop] = dict_merge(
+ default_values['next_hop'], failover['route'][route]['next_hop'][next_hop])
+
+ return failover
+
+def verify(failover):
+ # bail out early - looks like removal from running config
+ if not failover:
+ return None
+
+ if 'route' not in failover:
+ raise ConfigError(f'Failover "route" is mandatory!')
+
+ for route, route_config in failover['route'].items():
+ if not route_config.get('next_hop'):
+ raise ConfigError(f'Next-hop for "{route}" is mandatory!')
+
+ for next_hop, next_hop_config in route_config.get('next_hop').items():
+ if 'interface' not in next_hop_config:
+ raise ConfigError(f'Interface for route "{route}" next-hop "{next_hop}" is mandatory!')
+
+ if not next_hop_config.get('check'):
+ raise ConfigError(f'Check target for next-hop "{next_hop}" is mandatory!')
+
+ if 'target' not in next_hop_config['check']:
+ raise ConfigError(f'Check target for next-hop "{next_hop}" is mandatory!')
+
+ check_type = next_hop_config['check']['type']
+ if check_type == 'tcp' and 'port' not in next_hop_config['check']:
+ raise ConfigError(f'Check port for next-hop "{next_hop}" and type TCP is mandatory!')
+
+ return None
+
+def generate(failover):
+ if not failover:
+ service_conf.unlink(missing_ok=True)
+ return None
+
+ # Add own rt_proto 'failover'
+ # Helps to detect all own routes 'proto failover'
+ with open(rt_proto_failover, 'w') as f:
+ f.write('111 failover\n')
+
+ # Write configuration file
+ conf_json = json.dumps(failover, indent=4)
+ service_conf.write_text(conf_json)
+ render(systemd_service, 'protocols/systemd_vyos_failover_service.j2', failover)
+
+ return None
+
+def apply(failover):
+ if not failover:
+ call(f'systemctl stop {service_name}.service')
+ call('ip route flush protocol failover')
+ else:
+ call('systemctl daemon-reload')
+ call(f'systemctl restart {service_name}.service')
+ call(f'ip route flush protocol failover')
+
+ return None
+
+if __name__ == '__main__':
+ try:
+ c = get_config()
+ verify(c)
+ generate(c)
+ apply(c)
+ except ConfigError as e:
+ print(e)
+ exit(1)
diff --git a/src/helpers/vyos-failover.py b/src/helpers/vyos-failover.py
new file mode 100755
index 000000000..1ac193423
--- /dev/null
+++ b/src/helpers/vyos-failover.py
@@ -0,0 +1,184 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2022 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 argparse
+import json
+import subprocess
+import socket
+import time
+
+from vyos.util import rc_cmd
+from pathlib import Path
+from systemd import journal
+
+
+my_name = Path(__file__).stem
+
+
+def get_best_route_options(route, debug=False):
+ """
+ Return current best route ('gateway, interface, metric)
+
+ % get_best_route_options('203.0.113.1')
+ ('192.168.0.1', 'eth1', 1)
+
+ % get_best_route_options('203.0.113.254')
+ (None, None, None)
+ """
+ rc, data = rc_cmd(f'ip --detail --json route show protocol failover {route}')
+ if rc == 0:
+ data = json.loads(data)
+ if len(data) == 0:
+ print(f'\nRoute {route} for protocol failover was not found')
+ return None, None, None
+ # Fake metric 999 by default
+ # Search route with the lowest metric
+ best_metric = 999
+ for entry in data:
+ if debug: print('\n', entry)
+ metric = entry.get('metric')
+ gateway = entry.get('gateway')
+ iface = entry.get('dev')
+ if metric < best_metric:
+ best_metric = metric
+ best_gateway = gateway
+ best_interface = iface
+ if debug:
+ print(f'### Best_route exists: {route}, best_gateway: {best_gateway}, '
+ f'best_metric: {best_metric}, best_iface: {best_interface}')
+ return best_gateway, best_interface, best_metric
+
+def is_port_open(ip, port):
+ """
+ Check connection to remote host and port
+ Return True if host alive
+
+ % is_port_open('example.com', 8080)
+ True
+ """
+ s = socket.socket(socket.AF_INET, socket.SOCK_STREAM, socket.IPPROTO_TCP)
+ s.settimeout(2)
+ try:
+ s.connect((ip, int(port)))
+ s.shutdown(socket.SHUT_RDWR)
+ return True
+ except:
+ return False
+ finally:
+ s.close()
+
+def is_target_alive(target=None, iface='', proto='icmp', port=None, debug=False):
+ """
+ Host availability check by ICMP, ARP, TCP
+ Return True if target checks is successful
+
+ % is_target_alive('192.0.2.1', 'eth1', proto='arp')
+ True
+ """
+ if iface != '':
+ iface = f'-I {iface}'
+ if proto == 'icmp':
+ command = f'/usr/bin/ping -q {target} {iface} -n -c 2 -W 1'
+ rc, response = rc_cmd(command)
+ if debug: print(f' [ CHECK-TARGET ]: [{command}] -- return-code [RC: {rc}]')
+ if rc == 0:
+ return True
+ elif proto == 'arp':
+ command = f'/usr/bin/arping -b -c 2 -f -w 1 -i 1 {iface} {target}'
+ rc, response = rc_cmd(command)
+ if debug: print(f' [ CHECK-TARGET ]: [{command}] -- return-code [RC: {rc}]')
+ if rc == 0:
+ return True
+ elif proto == 'tcp' and port is not None:
+ return True if is_port_open(target, port) else False
+ else:
+ return False
+
+
+if __name__ == '__main__':
+ # Parse command arguments and get config
+ parser = argparse.ArgumentParser()
+ parser.add_argument('-c',
+ '--config',
+ action='store',
+ help='Path to protocols failover configuration',
+ required=True,
+ type=Path)
+
+ args = parser.parse_args()
+ try:
+ config_path = Path(args.config)
+ config = json.loads(config_path.read_text())
+ except Exception as err:
+ print(
+ f'Configuration file "{config_path}" does not exist or malformed: {err}'
+ )
+ exit(1)
+
+ # Useful debug info to console, use debug = True
+ # sudo systemctl stop vyos-failover.service
+ # sudo /usr/libexec/vyos/vyos-failover.py --config /run/vyos-failover.conf
+ debug = False
+
+ while(True):
+
+ for route, route_config in config.get('route').items():
+
+ exists_route = exists_gateway, exists_iface, exists_metric = get_best_route_options(route, debug=debug)
+
+ for next_hop, nexthop_config in route_config.get('next_hop').items():
+ conf_iface = nexthop_config.get('interface')
+ conf_metric = int(nexthop_config.get('metric'))
+ port = nexthop_config.get('check').get('port')
+ port_opt = f'port {port}' if port else ''
+ proto = nexthop_config.get('check').get('type')
+ target = nexthop_config.get('check').get('target')
+ timeout = nexthop_config.get('check').get('timeout')
+
+ # Best route not fonund in the current routing table
+ if exists_route == (None, None, None):
+ if debug: print(f" [NEW_ROUTE_DETECTED] route: [{route}]")
+ # Add route if check-target alive
+ if is_target_alive(target, conf_iface, proto, port, debug=debug):
+ if debug: print(f' [ ADD ] -- ip route add {route} via {next_hop} dev {conf_iface} '
+ f'metric {conf_metric} proto failover\n###')
+ rc, command = rc_cmd(f'ip route add {route} via {next_hop} dev {conf_iface} '
+ f'metric {conf_metric} proto failover')
+ # If something is wrong and gateway not added
+ # Example: Error: Next-hop has invalid gateway.
+ if rc !=0:
+ if debug: print(f'{command} -- return-code [RC: {rc}] {next_hop} dev {conf_iface}')
+ else:
+ journal.send(f'ip route add {route} via {next_hop} dev {conf_iface} '
+ f'metric {conf_metric} proto failover', SYSLOG_IDENTIFIER=my_name)
+ else:
+ if debug: print(f' [ TARGET_FAIL ] target checks fails for [{target}], do nothing')
+ journal.send(f'Check fail for route {route} target {target} proto {proto} '
+ f'{port_opt}', SYSLOG_IDENTIFIER=my_name)
+
+ # Route was added, check if the target is alive
+ # We should delete route if check fails only if route exists in the routing table
+ if not is_target_alive(target, conf_iface, proto, port, debug=debug) and \
+ exists_route != (None, None, None):
+ if debug:
+ print(f'Nexh_hop {next_hop} fail, target not response')
+ print(f' [ DEL ] -- ip route del {route} via {next_hop} dev {conf_iface} '
+ f'metric {conf_metric} proto failover [DELETE]')
+ rc_cmd(f'ip route del {route} via {next_hop} dev {conf_iface} metric {conf_metric} proto failover')
+ journal.send(f'ip route del {route} via {next_hop} dev {conf_iface} '
+ f'metric {conf_metric} proto failover', SYSLOG_IDENTIFIER=my_name)
+
+ time.sleep(int(timeout))