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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 os
import sys
from sys import exit
from copy import deepcopy
from vyos.config import Config
from vyos import ConfigError
ipv6_blacklist_file = '/etc/modprobe.d/vyos_blacklist_ipv6.conf'
ipv6_disable_file = '/etc/modprobe.d/vyos_disable_ipv6.conf'
default_config_data = {
'blacklist': False,
'reboot_message': False,
'ipv6_forward': '1',
'disable_addr_assignment': False,
'mp_layer4_hashing': '0',
'neighbor_cache': 8192,
'strict_dad': '1'
}
def sysctl(name, value):
os.system('sysctl -wq {}={}'.format(name, value))
def get_config():
ip_opt = deepcopy(default_config_data)
conf = Config()
conf.set_level('system ipv6')
if conf.exists(''):
ip_opt['blacklist'] = conf.exists('blacklist')
if conf.exists_effective('blacklist') != conf.exists('blacklist'):
ip_opt['reboot_message'] = True
ip_opt['disable_addr_assignment'] = conf.exists('disable')
if conf.exists_effective('disable') != conf.exists('disable'):
ip_opt['reboot_message'] = True
if conf.exists('disable-forwarding'):
ip_opt['ipv6_forward'] = '0'
if conf.exists('multipath layer4-hashing'):
ip_opt['mp_layer4_hashing'] = '1'
if conf.exists('neighbor table-size'):
ip_opt['neighbor_cache'] = int(conf.return_value('neighbor table-size'))
if conf.exists('strict-dad'):
ip_opt['strict_dad'] = 2
return ip_opt
def verify(ip_opt):
pass
def generate(ip_opt):
pass
def apply(ip_opt):
# disable IPv6 kernel module
if ip_opt['blacklist']:
with open(ipv6_blacklist_file, 'w') as f:
f.write('blacklist ipv6')
else:
if os.path.exists(ipv6_blacklist_file):
os.unlink(ipv6_blacklist_file)
# disable IPv6 address assignment
if ip_opt['disable_addr_assignment']:
with open(ipv6_disable_file, 'w') as f:
f.write('options ipv6 disable_ipv6=1')
else:
if os.path.exists(ipv6_disable_file):
os.unlink(ipv6_disable_file)
if ip_opt['reboot_message']:
print('Changing IPv6 blacklist/disable parameter will only take affect\n' \
'when the system is rebooted.')
# configure multipath
sysctl('net.ipv6.fib_multipath_hash_policy', ip_opt['mp_layer4_hashing'])
# apply neighbor table threshold values
sysctl('net.ipv6.neigh.default.gc_thresh3', ip_opt['neighbor_cache'])
sysctl('net.ipv6.neigh.default.gc_thresh2', ip_opt['neighbor_cache'] // 2)
sysctl('net.ipv6.neigh.default.gc_thresh1', ip_opt['neighbor_cache'] // 8)
# enable/disable IPv6 forwarding
with open('/proc/sys/net/ipv6/conf/all/forwarding', 'w') as f:
f.write(ip_opt['ipv6_forward'])
# configure IPv6 strict-dad
for root, dirs, files in os.walk('/proc/sys/net/ipv6/conf'):
for name in files:
if name == "accept_dad":
with open(os.path.join(root, name), 'w') as f:
f.write(str(ip_opt['strict_dad']))
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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