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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 vyos.config import Config
from vyos.configverify import verify_vrf
from vyos.template import is_ipv6
from vyos.template import render_to_string
from vyos.utils.network import is_ipv6_link_local
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,
no_tag_node_value_mangle=True)
# Bail out early if configuration tree does not exist
if not conf.exists(base):
return bfd
bfd = conf.merge_defaults(bfd, recursive=True)
return bfd
def verify(bfd):
if not bfd:
return None
if 'peer' in bfd:
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('BFD 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('BFD multihop and source interface cannot be used together')
if 'minimum_ttl' in peer_config and 'multihop' not in peer_config:
raise ConfigError('Minimum TTL is only available for multihop BFD sessions!')
if 'profile' in peer_config:
profile_name = peer_config['profile']
if 'profile' not in bfd or profile_name not in bfd['profile']:
raise ConfigError(f'BFD profile "{profile_name}" does not exist!')
if 'vrf' in peer_config:
verify_vrf(peer_config)
return None
def generate(bfd):
if not bfd:
return None
bfd['new_frr_config'] = render_to_string('frr/bfdd.frr.j2', bfd)
def apply(bfd):
bfd_daemon = 'bfdd'
# Save original configuration prior to starting any commit actions
frr_cfg = frr.FRRConfig()
frr_cfg.load_configuration(bfd_daemon)
frr_cfg.modify_section('^bfd', stop_pattern='^exit', remove_stop_mark=True)
if 'new_frr_config' in bfd:
frr_cfg.add_before(frr.default_add_before, bfd['new_frr_config'])
frr_cfg.commit_configuration(bfd_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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