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vrf_vni.py
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vrf_vni.py
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#!/usr/bin/env python3
#
# Copyright (C) 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/>.
from sys import argv
from sys import exit
from vyos.config import Config
from vyos.template import render_to_string
from vyos.util import dict_search
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_name = None
if len(argv) > 1:
vrf_name = argv[1]
else:
return None
# Using duplicate L3VNIs makes no sense - it's also forbidden in FRR,
# thus VyOS CLI must deny this, too. Instead of getting only the dict for
# the requested VRF and den comparing it with depenent VRfs to not have any
# duplicate we will just grad ALL VRFs by default but only render/apply
# the configuration for the requested VRF - that makes the code easier and
# hopefully less error prone
vrf = conf.get_config_dict(['vrf'], key_mangling=('-', '_'),
no_tag_node_value_mangle=True,
get_first_key=True)
# Store name of VRF we are interested in for FRR config rendering
vrf.update({'only_vrf' : vrf_name})
return vrf
def verify(vrf):
if not vrf:
return
if len(argv) < 2:
raise ConfigError('VRF parameter not specified when valling vrf_vni.py')
if 'name' in vrf:
vni_ids = []
for name, vrf_config in vrf['name'].items():
# VRF VNI (Virtual Network Identifier) must be unique on the system
if 'vni' in vrf_config:
if vrf_config['vni'] in vni_ids:
raise ConfigError(f'VRF "{name}" VNI is not unique!')
vni_ids.append(vrf_config['vni'])
return None
def generate(vrf):
if not vrf:
return
vrf['new_frr_config'] = render_to_string('frr/zebra.vrf.route-map.frr.j2', vrf)
return None
def apply(vrf):
frr_daemon = 'zebra'
# add configuration to FRR
frr_cfg = frr.FRRConfig()
frr_cfg.load_configuration(frr_daemon)
# There is only one VRF inside the dict as we read only one in get_config()
if vrf and 'only_vrf' in vrf:
vrf_name = vrf['only_vrf']
frr_cfg.modify_section(f'^vrf {vrf_name}', stop_pattern='^exit-vrf', remove_stop_mark=True)
if vrf and 'new_frr_config' in vrf:
frr_cfg.add_before(frr.default_add_before, vrf['new_frr_config'])
frr_cfg.commit_configuration(frr_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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