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protocols_mpls.py
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protocols_mpls.py
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#!/usr/bin/env python3
#
# Copyright (C) 2020 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 node_changed
from vyos.template import render_to_string
from vyos.util import call
from vyos.util import dict_search
from vyos import ConfigError
from vyos import frr
from vyos import airbag
airbag.enable()
config_file = r'/tmp/ldpd.frr'
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
base = ['protocols', 'mpls']
mpls = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True)
return mpls
def verify(mpls):
# If no config, then just bail out early.
if not mpls:
return None
# Checks to see if LDP is properly configured
if 'ldp' in mpls:
# If router ID not defined
if 'router_id' not in mpls['ldp']:
raise ConfigError('Router ID missing. An LDP router id is mandatory!')
# If interface not set
if 'interface' not in mpls['ldp']:
raise ConfigError('LDP interfaces are missing. An LDP interface is mandatory!')
# If transport addresses are not set
if not dict_search('ldp.discovery.transport_ipv4_address', mpls) and \
not dict_search('ldp.discovery.transport_ipv6_address', mpls):
raise ConfigError('LDP transport address missing!')
return None
def generate(mpls):
# If there's no MPLS config generated, create dictionary key with no value.
if not mpls:
mpls['new_frr_config'] = ''
return None
mpls['new_frr_config'] = render_to_string('frr/ldpd.frr.tmpl', mpls)
return None
def apply(mpls):
# Define dictionary that will load FRR config
frr_cfg = {}
# Save original configuration prior to starting any commit actions
frr_cfg['original_config'] = frr.get_configuration(daemon='ldpd')
frr_cfg['modified_config'] = frr.replace_section(frr_cfg['original_config'], mpls['new_frr_config'], from_re='mpls.*')
# If FRR config is blank, rerun the blank commit three times due to frr-reload
# behavior/bug not properly clearing out on one commit.
if mpls['new_frr_config'] == '':
for x in range(3):
frr.reload_configuration(frr_cfg['modified_config'], daemon='ldpd')
elif not 'ldp' in mpls:
for x in range(3):
frr.reload_configuration(frr_cfg['modified_config'], daemon='ldpd')
else:
# FRR mark configuration will test for syntax errors and throws an
# exception if any syntax errors is detected
frr.mark_configuration(frr_cfg['modified_config'])
# Commit resulting configuration to FRR, this will throw CommitError
# on failure
frr.reload_configuration(frr_cfg['modified_config'], daemon='ldpd')
# Set number of entries in the platform label tables
labels = '0'
if 'interface' in mpls:
labels = '1048575'
call(f'sysctl -wq net.mpls.platform_labels={labels}')
# Check for changes in global MPLS options
if 'parameters' in mpls:
# Choose whether to copy IP TTL to MPLS header TTL
if 'no_propagate_ttl' in mpls['parameters']:
call('sysctl -wq net.mpls.ip_ttl_propagate=0')
# Choose whether to limit maximum MPLS header TTL
if 'maximum_ttl' in mpls['parameters']:
ttl = mpls['parameters']['maximum_ttl']
call(f'sysctl -wq net.mpls.default_ttl={ttl}')
else:
# Set default global MPLS options if not defined.
call('sysctl -wq net.mpls.ip_ttl_propagate=1')
call('sysctl -wq net.mpls.default_ttl=255')
# Enable and disable MPLS processing on interfaces per configuration
if 'interface' in mpls:
system_interfaces = []
system_interfaces.append(((os.popen('sysctl net.mpls.conf').read()).split('\n')))
del system_interfaces[0][-1]
for configured_interface in mpls['interface']:
for system_interface in system_interfaces[0]:
if configured_interface in system_interface:
call(f'sysctl -wq net.mpls.conf.{configured_interface}.input=1')
elif system_interface.endswith(' = 1'):
system_interface = system_interface.replace(' = 1', '=0')
call(f'sysctl -wq {system_interface}')
else:
# If MPLS interfaces are not configured, set MPLS processing disabled
system_interfaces = []
system_interfaces.append(((os.popen('sysctl net.mpls.conf').read()).replace(" = 1", "=0")).split('\n'))
del system_interfaces[0][-1]
for interface in (system_interfaces[0]):
call(f'sysctl -wq {interface}')
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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