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protocols_ripng.py
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protocols_ripng.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.configverify import verify_route_maps
from vyos.util import call
from vyos.util import dict_search
from vyos.xml import defaults
from vyos.template import render_to_string
from vyos import ConfigError
from vyos import frr
from vyos import airbag
airbag.enable()
frr_daemon = 'ripngd'
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
base = ['protocols', 'ripng']
ripng = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True)
# Bail out early if configuration tree does not exist
if not conf.exists(base):
return ripng
# We have gathered the dict representation of the CLI, but there are default
# options which we need to update into the dictionary retrived.
default_values = defaults(base)
# merge in remaining default values
ripng = dict_merge(default_values, ripng)
# We also need some additional information from the config, prefix-lists
# and route-maps for instance. They will be used in verify()
base = ['policy']
tmp = conf.get_config_dict(base, key_mangling=('-', '_'))
# Merge policy dict into OSPF dict
ripng = dict_merge(tmp, ripng)
return ripng
def verify(ripng):
if not ripng:
return None
acl_in = dict_search('distribute_list.access_list.in', ripng)
if acl_in and acl_in not in (dict_search('policy.access_list6', ripng) or []):
raise ConfigError(f'Inbound access-list6 "{acl_in}" does not exist!')
acl_out = dict_search('distribute_list.access_list.out', ripng)
if acl_out and acl_out not in (dict_search('policy.access_list6', ripng) or []):
raise ConfigError(f'Outbound access-list6 "{acl_out}" does not exist!')
prefix_list_in = dict_search('distribute_list.prefix_list.in', ripng)
if prefix_list_in and prefix_list_in.replace('-','_') not in (dict_search('policy.prefix_list6', ripng) or []):
raise ConfigError(f'Inbound prefix-list6 "{prefix_list_in}" does not exist!')
prefix_list_out = dict_search('distribute_list.prefix_list.out', ripng)
if prefix_list_out and prefix_list_out.replace('-','_') not in (dict_search('policy.prefix_list6', ripng) or []):
raise ConfigError(f'Outbound prefix-list6 "{prefix_list_out}" does not exist!')
if 'interface' in ripng:
for interface, interface_options in ripng['interface'].items():
if 'authentication' in interface_options:
if {'md5', 'plaintext_password'} <= set(interface_options['authentication']):
raise ConfigError('Can not use both md5 and plaintext-password at the same time!')
if 'split_horizon' in interface_options:
if {'disable', 'poison_reverse'} <= set(interface_options['split_horizon']):
raise ConfigError(f'You can not have "split-horizon poison-reverse" enabled ' \
f'with "split-horizon disable" for "{interface}"!')
verify_route_maps(ripng)
def generate(ripng):
if not ripng:
ripng['new_frr_config'] = ''
return None
ripng['new_frr_config'] = render_to_string('frr/ripng.frr.tmpl', ripng)
return None
def apply(ripng):
# Save original configuration prior to starting any commit actions
frr_cfg = frr.FRRConfig()
frr_cfg.load_configuration(frr_daemon)
frr_cfg.modify_section(r'key chain \S+', '')
frr_cfg.modify_section(r'interface \S+', '')
frr_cfg.modify_section('router ripng', '')
frr_cfg.add_before(r'(ip prefix-list .*|route-map .*|line vty)', ripng['new_frr_config'])
frr_cfg.commit_configuration(frr_daemon)
# If FRR config is blank, rerun the blank commit x times due to frr-reload
# behavior/bug not properly clearing out on one commit.
if ripng['new_frr_config'] == '':
for a in range(5):
frr_cfg.commit_configuration(frr_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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