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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 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 sys
import jinja2
import copy
import os
import vyos.validate
from vyos import ConfigError
from vyos.config import Config
config_file = r'/tmp/bfd.frr'
# Please be careful if you edit the template.
config_tmpl = """
!
bfd
{% for peer in old_peers -%}
no peer {{ peer }}
{% endfor -%}
!
{% for peer in new_peers -%}
peer {{ peer.remote }}{% if peer.multihop %} multihop{% endif %}{% if peer.src_addr %} local-address {{ peer.src_addr }}{% endif %}{% if peer.src_if %} interface {{ peer.src_if }}{% endif %}
detect-multiplier {{ peer.multiplier }}
receive-interval {{ peer.rx_interval }}
transmit-interval {{ peer.tx_interval }}
{% if not peer.shutdown %}no {% endif %}shutdown
{% endfor -%}
!
"""
default_config_data = {
'new_peers': [],
'old_peers' : []
}
def get_config():
bfd = copy.deepcopy(default_config_data)
conf = Config()
if not (conf.exists('protocols bfd') or conf.exists_effective('protocols bfd')):
return None
else:
conf.set_level('protocols bfd')
# as we have to use vtysh to talk to FRR we also need to know
# which peers are gone due to a config removal - thus we read in
# all peers (active or to delete)
bfd['old_peers'] = conf.list_effective_nodes('peer')
for peer in conf.list_nodes('peer'):
conf.set_level('protocols bfd peer {0}'.format(peer))
bfd_peer = {
'remote': peer,
'shutdown': False,
'src_if': '',
'src_addr': '',
'multiplier': '3',
'rx_interval': '300',
'tx_interval': '300',
'multihop': False
}
# Check if individual peer is disabled
if conf.exists('shutdown'):
bfd_peer['shutdown'] = True
# Check if peer has a local source interface configured
if conf.exists('source interface'):
bfd_peer['src_if'] = conf.return_value('source interface')
# Check if peer has a local source address configured - this is mandatory for IPv6
if conf.exists('source address'):
bfd_peer['src_addr'] = conf.return_value('source address')
# Configures the detection multiplier to determine packet loss. The remote
# transmission interval will be multiplied by this value to determine the
# connection loss detection timer. The default value is 3.
if conf.exists('multiplier'):
bfd_peer['multiplier'] = conf.return_value('multiplier')
# Tell BFD daemon that we should expect packets with TTL less than 254
# (because it will take more than one hop) and to listen on the multihop
# port (4784)
if conf.exists('multihop'):
bfd_peer['multihop'] = True
# Configures the minimum interval that this system is capable of receiving
# control packets. The default value is 300 milliseconds.
if conf.exists('interval receive'):
bfd_peer['rx_interval'] = conf.return_value('interval receive')
# The minimum transmission interval (less jitter) that this system wants
# to use to send BFD control packets.
if conf.exists('interval transmit'):
bfd_peer['tx_interval'] = conf.return_value('interval transmit')
bfd['new_peers'].append(bfd_peer)
return bfd
def verify(bfd):
if bfd is None:
return None
for peer in bfd['new_peers']:
# Bail out early if peer is shutdown
if peer['shutdown']:
continue
# IPv6 peers require an explicit local address/interface combination
if vyos.validate.is_ipv6(peer['remote']):
if not (peer['src_if'] and peer['src_addr']):
raise ConfigError('BFD IPv6 peers require explicit local address/interface setting')
# multihop doesn't accept interface names
if peer['multihop'] and peer['src_if']:
raise ConfigError('multihop does not accept interface names')
return None
def generate(bfd):
if bfd is None:
return None
return None
def apply(bfd):
if bfd is None:
return None
tmpl = jinja2.Template(config_tmpl)
config_text = tmpl.render(bfd)
with open(config_file, 'w') as f:
f.write(config_text)
os.system("sudo vtysh -d bfdd -f " + config_file)
if os.path.exists(config_file):
os.remove(config_file)
return None
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
sys.exit(1)

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