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protocols_ospfv3.py
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protocols_ospfv3.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.configdict import dict_merge
from vyos.configdict import node_changed
from vyos.configverify import verify_common_route_maps
from vyos.template import render_to_string
from vyos.ifconfig import Interface
from vyos.xml import defaults
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()
base = ['protocols', 'ospfv3']
ospfv3 = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True)
# FRR has VRF support for different routing daemons. As interfaces belong
# to VRFs - or the global VRF, we need to check for changed interfaces so
# that they will be properly rendered for the FRR config. Also this eases
# removal of interfaces from the running configuration.
interfaces_removed = node_changed(conf, base + ['interface'])
if interfaces_removed:
ospfv3['interface_removed'] = list(interfaces_removed)
# Bail out early if configuration tree does not exist
if not conf.exists(base):
ospfv3.update({'deleted' : ''})
return ospfv3
# 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
ospfv3 = dict_merge(tmp, ospfv3)
return ospfv3
def verify(ospfv3):
if not ospfv3:
return None
verify_common_route_maps(ospfv3)
if 'interface' in ospfv3:
for ifname, if_config in ospfv3['interface'].items():
if 'ifmtu' in if_config:
mtu = Interface(ifname).get_mtu()
if int(if_config['ifmtu']) > int(mtu):
raise ConfigError(f'OSPFv3 ifmtu can not exceed physical MTU of "{mtu}"')
return None
def generate(ospfv3):
if not ospfv3 or 'deleted' in ospfv3:
return None
ospfv3['new_frr_config'] = render_to_string('frr/ospf6d.frr.tmpl', ospfv3)
return None
def apply(ospfv3):
ospf6_daemon = 'ospf6d'
# Save original configuration prior to starting any commit actions
frr_cfg = frr.FRRConfig()
frr_cfg.load_configuration(ospf6_daemon)
frr_cfg.modify_section('^router ospf6', stop_pattern='^exit', remove_stop_mark=True)
for key in ['interface', 'interface_removed']:
if key not in ospfv3:
continue
for interface in ospfv3[key]:
frr_cfg.modify_section(f'^interface {interface}', stop_pattern='^exit', remove_stop_mark=True)
if 'new_frr_config' in ospfv3:
frr_cfg.add_before(frr.default_add_before, ospfv3['new_frr_config'])
frr_cfg.commit_configuration(ospf6_daemon)
# Save configuration to /run/frr/config/frr.conf
frr.save_configuration()
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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