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protocols_mpls.py
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protocols_mpls.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/ldpd.frr'
# Please be careful if you edit the template.
config_tmpl = """
!
{% if mpls_ldp -%}
mpls ldp
{% if old_router_id -%}
no router-id {{ old_router_id }}
{% endif -%}
{% if router_id -%}
router-id {{ router_id }}
{% endif -%}
{% for neighbor_id in old_ldp.neighbors -%}
no neighbor {{neighbor_id}} password {{old_ldp.neighbors[neighbor_id].password}}
{% endfor -%}
{% for neighbor_id in ldp.neighbors -%}
neighbor {{neighbor_id}} password {{ldp.neighbors[neighbor_id].password}}
{% endfor -%}
address-family ipv4
label local allocate host-routes
{% if old_ldp.d_transp_ipv4 -%}
no discovery transport-address {{ old_ldp.d_transp_ipv4 }}
{% endif -%}
{% if ldp.d_transp_ipv4 -%}
discovery transport-address {{ ldp.d_transp_ipv4 }}
{% endif -%}
{% for interface in old_ldp.interfaces -%}
no interface {{interface}}
{% endfor -%}
{% for interface in ldp.interfaces -%}
interface {{interface}}
{% endfor -%}
!
!
exit-address-family
!
{% if ldp.d_transp_ipv6 -%}
address-family ipv6
label local allocate host-routes
{% if old_ldp.d_transp_ipv6 -%}
no discovery transport-address {{ old_ldp.d_transp_ipv6 }}
{% endif -%}
{% if ldp.d_transp_ipv6 -%}
discovery transport-address {{ ldp.d_transp_ipv6 }}
{% endif -%}
{% for interface in old_ldp.interfaces -%}
no interface {{interface}}
{% endfor -%}
{% for interface in ldp.interfaces -%}
interface {{interface}}
{% endfor -%}
!
exit-address-family
{% else -%}
no address-family ipv6
{% endif -%}
!
{% else -%}
no mpls ldp
{% endif -%}
!
"""
def sysctl(name, value):
os.system('sysctl -wq {}={}'.format(name, value))
def get_config():
conf = Config()
mpls_conf = {
'router_id' : None,
'mpls_ldp' : False,
'old_ldp' : {
'interfaces' : [],
'neighbors' : {},
'd_transp_ipv4' : None,
'd_transp_ipv6' : None
},
'ldp' : {
'interfaces' : [],
'neighbors' : {},
'd_transp_ipv4' : None,
'd_transp_ipv6' : None
}
}
if not (conf.exists('protocols mpls') or conf.exists_effective('protocols mpls')):
return None
if conf.exists('protocols mpls ldp'):
mpls_conf['mpls_ldp'] = True
conf.set_level('protocols mpls ldp')
# Get router-id
if conf.exists_effective('router-id'):
mpls_conf['old_router_id'] = conf.return_effective_value('router-id')
if conf.exists('router-id'):
mpls_conf['router_id'] = conf.return_value('router-id')
# Get discovery transport-ipv4-address
if conf.exists_effective('discovery transport-ipv4-address'):
mpls_conf['old_ldp']['d_transp_ipv4'] = conf.return_effective_value('discovery transport-ipv4-address')
if conf.exists('discovery transport-ipv4-address'):
mpls_conf['ldp']['d_transp_ipv4'] = conf.return_value('discovery transport-ipv4-address')
# Get discovery transport-ipv6-address
if conf.exists_effective('discovery transport-ipv6-address'):
mpls_conf['old_ldp']['d_transp_ipv6'] = conf.return_effective_value('discovery transport-ipv6-address')
if conf.exists('discovery transport-ipv6-address'):
mpls_conf['ldp']['d_transp_ipv6'] = conf.return_value('discovery transport-ipv6-address')
# Get interfaces
if conf.exists_effective('interface'):
mpls_conf['old_ldp']['interfaces'] = conf.return_effective_values('interface')
if conf.exists('interface'):
mpls_conf['ldp']['interfaces'] = conf.return_values('interface')
# Get neighbors
for neighbor in conf.list_effective_nodes('neighbor'):
mpls_conf['old_ldp']['neighbors'].update({
neighbor : {
'password' : conf.return_effective_value('neighbor {0} password'.format(neighbor))
}
})
for neighbor in conf.list_nodes('neighbor'):
mpls_conf['ldp']['neighbors'].update({
neighbor : {
'password' : conf.return_value('neighbor {0} password'.format(neighbor))
}
})
# print(mpls_conf)
# sys.exit(1)
return mpls_conf
def operate_mpls_on_intfc(interfaces, action):
rp_filter = 0
if action == 1:
rp_filter = 2
for iface in interfaces:
sysctl('net.mpls.conf.{0}.input'.format(iface), action)
# Operate rp filter
sysctl('net.ipv4.conf.{0}.rp_filter'.format(iface), rp_filter)
def verify(mpls):
if mpls is None:
return None
if mpls['mpls_ldp']:
# Requre router-id
if not mpls['router_id']:
raise ConfigError(f"MPLS ldp router-id is mandatory!")
# Requre discovery transport-address
if not mpls['ldp']['d_transp_ipv4'] and not mpls['ldp']['d_transp_ipv6']:
raise ConfigError(f"MPLS ldp discovery transport address is mandatory!")
# Requre interface
if not mpls['ldp']['interfaces']:
raise ConfigError(f"MPLS ldp interface is mandatory!")
def generate(mpls):
if mpls is None:
return None
tmpl = jinja2.Template(config_tmpl)
config_text = tmpl.render(mpls)
with open(config_file, 'w') as f:
f.write(config_text)
return None
def apply(mpls):
if mpls is None:
return None
# Set number of entries in the platform label table
if mpls['mpls_ldp']:
sysctl('net.mpls.platform_labels', '1048575')
else:
sysctl('net.mpls.platform_labels', '0')
# Do not copy IP TTL to MPLS header
sysctl('net.mpls.ip_ttl_propagate', '0')
# Allow mpls on interfaces
operate_mpls_on_intfc(mpls['ldp']['interfaces'], 1)
# Disable mpls on deleted interfaces
diactive_ifaces = set(mpls['old_ldp']['interfaces']).difference(mpls['ldp']['interfaces'])
operate_mpls_on_intfc(diactive_ifaces, 0)
if os.path.exists(config_file):
os.system("sudo vtysh -d ldpd -f " + 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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