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protocols_mpls.py
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protocols_mpls.py
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#!/usr/bin/env python3
#
# Copyright (C) 2020-2022 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 glob import glob
from vyos.config import Config
from vyos.template import render_to_string
from vyos.utils.dict import dict_search
from vyos.utils.file import read_file
from vyos.utils.system import sysctl_write
from vyos.configverify import verify_interface_exists
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
if 'interface' in mpls:
for interface in mpls['interface']:
verify_interface_exists(interface)
# 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 or 'deleted' in mpls:
return None
mpls['frr_ldpd_config'] = render_to_string('frr/ldpd.frr.j2', mpls)
return None
def apply(mpls):
ldpd_damon = 'ldpd'
# Save original configuration prior to starting any commit actions
frr_cfg = frr.FRRConfig()
frr_cfg.load_configuration(ldpd_damon)
frr_cfg.modify_section(f'^mpls ldp', stop_pattern='^exit', remove_stop_mark=True)
if 'frr_ldpd_config' in mpls:
frr_cfg.add_before(frr.default_add_before, mpls['frr_ldpd_config'])
frr_cfg.commit_configuration(ldpd_damon)
# Set number of entries in the platform label tables
labels = '0'
if 'interface' in mpls:
labels = '1048575'
sysctl_write('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']:
sysctl_write('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']
sysctl_write('net.mpls.default_ttl', ttl)
else:
# Set default global MPLS options if not defined.
sysctl_write('net.mpls.ip_ttl_propagate', 1)
sysctl_write('net.mpls.default_ttl', 255)
# Enable and disable MPLS processing on interfaces per configuration
if 'interface' in mpls:
system_interfaces = []
# Populate system interfaces list with local MPLS capable interfaces
for interface in glob('/proc/sys/net/mpls/conf/*'):
system_interfaces.append(os.path.basename(interface))
# This is where the comparison is done on if an interface needs to be enabled/disabled.
for system_interface in system_interfaces:
interface_state = read_file(f'/proc/sys/net/mpls/conf/{system_interface}/input')
if '1' in interface_state:
if system_interface not in mpls['interface']:
system_interface = system_interface.replace('.', '/')
sysctl_write(f'net.mpls.conf.{system_interface}.input', 0)
elif '0' in interface_state:
if system_interface in mpls['interface']:
system_interface = system_interface.replace('.', '/')
sysctl_write(f'net.mpls.conf.{system_interface}.input', 1)
else:
system_interfaces = []
# If MPLS interfaces are not configured, set MPLS processing disabled
for interface in glob('/proc/sys/net/mpls/conf/*'):
system_interfaces.append(os.path.basename(interface))
for system_interface in system_interfaces:
system_interface = system_interface.replace('.', '/')
sysctl_write(f'net.mpls.conf.{system_interface}.input', 0)
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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