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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 sys import argv
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.configverify import verify_route_map
from vyos.configverify import verify_interface_exists
from vyos.template import render_to_string
from vyos.ifconfig import Interface
from vyos.util import dict_search
from vyos.util import get_interface_config
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()
vrf = None
if len(argv) > 1:
vrf = argv[1]
base_path = ['protocols', 'ospfv3']
# eqivalent of the C foo ? 'a' : 'b' statement
base = vrf and ['vrf', 'name', vrf, 'protocols', 'ospfv3'] or base_path
ospfv3 = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True)
# Assign the name of our VRF context. This MUST be done before the return
# statement below, else on deletion we will delete the default instance
# instead of the VRF instance.
if vrf: ospfv3['vrf'] = vrf
# 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 have gathered the dict representation of the CLI, but there are default
# options which we need to update into the dictionary retrived.
# XXX: Note that we can not call defaults(base), as defaults does not work
# on an instance of a tag node. As we use the exact same CLI definition for
# both the non-vrf and vrf version this is absolutely safe!
default_values = defaults(base_path)
# We have to cleanup the default dict, as default values could enable features
# which are not explicitly enabled on the CLI. Example: default-information
# originate comes with a default metric-type of 2, which will enable the
# entire default-information originate tree, even when not set via CLI so we
# need to check this first and probably drop that key.
if dict_search('default_information.originate', ospfv3) is None:
del default_values['default_information']
# XXX: T2665: we currently have no nice way for defaults under tag nodes,
# clean them out and add them manually :(
del default_values['interface']
# merge in remaining default values
ospfv3 = dict_merge(default_values, 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)
# As we can have a default-information route-map, we need to validate it!
route_map_name = dict_search('default_information.originate.route_map', ospfv3)
if route_map_name: verify_route_map(route_map_name, ospfv3)
if 'area' in ospfv3:
for area, area_config in ospfv3['area'].items():
if 'area_type' in area_config:
if len(area_config['area_type']) > 1:
raise ConfigError(f'Can only configure one area-type for OSPFv3 area "{area}"!')
if 'interface' in ospfv3:
for interface, interface_config in ospfv3['interface'].items():
verify_interface_exists(interface)
if 'ifmtu' in interface_config:
mtu = Interface(interface).get_mtu()
if int(interface_config['ifmtu']) > int(mtu):
raise ConfigError(f'OSPFv3 ifmtu can not exceed physical MTU of "{mtu}"')
# If interface specific options are set, we must ensure that the
# interface is bound to our requesting VRF. Due to the VyOS
# priorities the interface is bound to the VRF after creation of
# the VRF itself, and before any routing protocol is configured.
if 'vrf' in ospfv3:
vrf = ospfv3['vrf']
tmp = get_interface_config(interface)
if 'master' not in tmp or tmp['master'] != vrf:
raise ConfigError(f'Interface {interface} is not a member of VRF {vrf}!')
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()
# Generate empty helper string which can be ammended to FRR commands, it
# will be either empty (default VRF) or contain the "vrf <name" statement
vrf = ''
if 'vrf' in ospfv3:
vrf = ' vrf ' + ospfv3['vrf']
frr_cfg.load_configuration(ospf6_daemon)
frr_cfg.modify_section(f'^router ospf6{vrf}', 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}{vrf}', 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)
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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