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protocols_static.py
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protocols_static.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 sys import argv
from vyos.config import Config
from vyos.configdict import dict_merge
from vyos.configdict import get_dhcp_interfaces
from vyos.configverify import verify_common_route_maps
from vyos.configverify import verify_vrf
from vyos.template import render_to_string
from vyos import ConfigError
from vyos import frr
from vyos import airbag
airbag.enable()
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
vrf = None
if len(argv) > 1:
vrf = argv[1]
base_path = ['protocols', 'static']
# eqivalent of the C foo ? 'a' : 'b' statement
base = vrf and ['vrf', 'name', vrf, 'protocols', 'static'] or base_path
static = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True)
# Assign the name of our VRF context
if vrf: static['vrf'] = vrf
# We also need some additional information from the config, prefix-lists
# and route-maps for instance. They will be used in verify().
#
# XXX: one MUST always call this without the key_mangling() option! See
# vyos.configverify.verify_common_route_maps() for more information.
tmp = conf.get_config_dict(['policy'])
# Merge policy dict into "regular" config dict
static = dict_merge(tmp, static)
# T3680 - get a list of all interfaces currently configured to use DHCP
tmp = get_dhcp_interfaces(conf, vrf)
if tmp: static['dhcp'] = tmp
return static
def verify(static):
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'Can not use both blackhole and reject for '\
'prefix "{prefix}"!')
return None
def generate(static):
if not static:
return None
static['new_frr_config'] = render_to_string('frr/staticd.frr.j2', static)
return None
def apply(static):
static_daemon = 'staticd'
zebra_daemon = 'zebra'
# Save original configuration prior to starting any commit actions
frr_cfg = frr.FRRConfig()
# The route-map used for the FIB (zebra) is part of the zebra daemon
frr_cfg.load_configuration(zebra_daemon)
frr_cfg.modify_section(r'^ip protocol static route-map [-a-zA-Z0-9.]+', '')
frr_cfg.commit_configuration(zebra_daemon)
frr_cfg.load_configuration(static_daemon)
if 'vrf' in static:
vrf = static['vrf']
frr_cfg.modify_section(f'^vrf {vrf}', stop_pattern='^exit', remove_stop_mark=True)
else:
frr_cfg.modify_section(r'^ip route .*')
frr_cfg.modify_section(r'^ipv6 route .*')
if 'new_frr_config' in static:
frr_cfg.add_before(frr.default_add_before, static['new_frr_config'])
frr_cfg.commit_configuration(static_daemon)
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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