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#!/usr/bin/env python3
#
# Copyright VyOS maintainers and contributors <maintainers@vyos.io>
#
# 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/>.
from ipaddress import IPv4Network
from sys import exit
from sys import argv
import os
from vyos.config import Config
from vyos.configverify import has_frr_protocol_in_dict
from vyos.configverify import verify_common_route_maps
from vyos.configverify import verify_vrf
from vyos.frrender import FRRender
from vyos.frrender import get_frrender_dict
from vyos.utils.dict import dict_search
from vyos.utils.file import write_file
from vyos.utils.process import is_systemd_service_running
from vyos.template import render
from vyos import ConfigError
from vyos import airbag
from vyos import defaults
airbag.enable()
config_file = '/etc/iproute2/rt_tables.d/vyos-static.conf'
DHCP_HOOK_IFLIST = defaults.static_route_dhcp_interfaces_path
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
return get_frrender_dict(conf, argv)
def verify(config_dict):
if not has_frr_protocol_in_dict(config_dict, 'static'):
return None
vrf = None
if 'vrf_context' in config_dict:
vrf = config_dict['vrf_context']
# equivalent of the C foo ? 'a' : 'b' statement
static = vrf and dict_search(f'vrf.name.{vrf}.protocols.static',
config_dict) or config_dict['static']
static['policy'] = config_dict['policy']
verify_common_route_maps(static)
for route in ['route', 'route6']:
# if there is no route(6) key in the dictionary we can immediately
# bail out early
if route not in static:
continue
# When leaking routes to other VRFs we must ensure that the destination
# VRF exists
for prefix, prefix_options in static[route].items():
# both the interface and next-hop CLI node can have a VRF subnode,
# thus we check this using a for loop
for type in ['interface', 'next_hop']:
if type in prefix_options:
for interface, interface_config in prefix_options[type].items():
verify_vrf(interface_config)
if {'blackhole', 'reject'} <= set(prefix_options):
raise ConfigError(f'Cannot use both blackhole and reject for '\
f'prefix "{prefix}"!')
if 'multicast' in static and 'route' in static['multicast']:
for prefix, prefix_options in static['multicast']['route'].items():
if not IPv4Network(prefix).is_multicast:
raise ConfigError(f'{prefix} is not a multicast network!')
return None
def generate(config_dict):
if not has_frr_protocol_in_dict(config_dict, 'static'):
return None
vrf = None
if 'vrf_context' in config_dict:
vrf = config_dict['vrf_context']
# equivalent of the C foo ? 'a' : 'b' statement
static = vrf and dict_search(f'vrf.name.{vrf}.protocols.static',
config_dict) or config_dict['static']
# Collect interfaces that have DHCP configuration for DHCP hooks
dhcp_interfaces = set()
# Check for DHCP interfaces in route configurations
if 'route' in static:
for prefix, prefix_options in static['route'].items():
if 'dhcp_interface' in prefix_options:
for interface_name in prefix_options['dhcp_interface']:
dhcp_interfaces.add(interface_name)
# Write the interface list for DHCP hooks or clean up if empty
if dhcp_interfaces:
write_file(DHCP_HOOK_IFLIST, " ".join(dhcp_interfaces))
elif os.path.exists(DHCP_HOOK_IFLIST):
os.unlink(DHCP_HOOK_IFLIST)
# Put routing table names in /etc/iproute2/rt_tables
render(config_file, 'iproute2/static.conf.j2', static)
if config_dict and not is_systemd_service_running('vyos-configd.service'):
FRRender().generate(config_dict)
return None
def apply(config_dict):
if config_dict and not is_systemd_service_running('vyos-configd.service'):
FRRender().apply()
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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