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protocols_bfd.py
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protocols_bfd.py
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#!/usr/bin/env python3
#
# Copyright (C) 2019-2021 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.template import is_ipv6
from vyos.template import render_to_string
from vyos.util import call
from vyos.validate import is_ipv6_link_local
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', 'bfd']
bfd = 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 bfd
if 'peer' in bfd:
# We have gathered the dict representation of the CLI, but there are
# default options which we need to update into the dictionary retrived.
# XXX: T2665: we currently have no nice way for defaults under tag
# nodes, thus we load the defaults "by hand"
default_values = defaults(base + ['peer'])
for peer in bfd['peer']:
bfd['peer'][peer] = dict_merge(default_values, bfd['peer'][peer])
return bfd
def verify(bfd):
if not bfd or 'peer' not in bfd:
return None
for peer, peer_config in bfd['peer'].items():
# IPv6 link local peers require an explicit local address/interface
if is_ipv6_link_local(peer):
if 'source' not in peer_config or len(peer_config['source'] < 2):
raise ConfigError('BFD IPv6 link-local peers require explicit local address and interface setting')
# IPv6 peers require an explicit local address
if is_ipv6(peer):
if 'source' not in peer_config or 'address' not in peer_config['source']:
raise ConfigError('BFD IPv6 peers require explicit local address setting')
if 'multihop' in peer_config:
# multihop require source address
if 'source' not in peer_config or 'address' not in peer_config['source']:
raise ConfigError('BFD multihop require source address')
# multihop and echo-mode cannot be used together
if 'echo_mode' in peer_config:
raise ConfigError('Multihop and echo-mode cannot be used together')
# multihop doesn't accept interface names
if 'source' in peer_config and 'interface' in peer_config['source']:
raise ConfigError('Multihop and source interface cannot be used together')
# echo interval can be configured only with enabled echo-mode
if 'interval' in peer_config and 'echo_interval' in peer_config['interval'] and 'echo_mode' not in peer_config:
raise ConfigError('echo-interval can be configured only with enabled echo-mode')
return None
def generate(bfd):
if not bfd:
bfd['new_frr_config'] = ''
return None
bfd['new_frr_config'] = render_to_string('frr/bfd.frr.tmpl', bfd)
def apply(bfd):
# Save original configuration prior to starting any commit actions
frr_cfg = frr.FRRConfig()
frr_cfg.load_configuration()
frr_cfg.modify_section('bfd', '')
frr_cfg.add_before(r'(ip prefix-list .*|route-map .*|line vty)', bfd['new_frr_config'])
frr_cfg.commit_configuration()
# 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 bfd['new_frr_config'] == '':
for a in range(5):
frr_cfg.commit_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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