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system-ipv6.py
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system-ipv6.py
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#!/usr/bin/env python3
#
# Copyright (C) 2019-2022 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 vyos.config import Config
from vyos.configdict import dict_merge
from vyos.util import dict_search
from vyos.util import sysctl_write
from vyos.util import write_file
from vyos.xml import defaults
from vyos import ConfigError
from vyos import airbag
airbag.enable()
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
base = ['system', 'ipv6']
opt = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True)
# We have gathered the dict representation of the CLI, but there are default
# options which we need to update into the dictionary retrived.
default_values = defaults(base)
opt = dict_merge(default_values, opt)
return opt
def verify(opt):
pass
def generate(opt):
pass
def apply(opt):
# configure multipath
tmp = dict_search('multipath.layer4_hashing', opt)
value = '1' if (tmp != None) else '0'
sysctl_write('net.ipv6.fib_multipath_hash_policy', value)
# Apply ND threshold values
# table_size has a default value - thus the key always exists
size = int(dict_search('neighbor.table_size', opt))
# Amount upon reaching which the records begin to be cleared immediately
sysctl_write('net.ipv6.neigh.default.gc_thresh3', size)
# Amount after which the records begin to be cleaned after 5 seconds
sysctl_write('net.ipv6.neigh.default.gc_thresh2', size // 2)
# Minimum number of stored records is indicated which is not cleared
sysctl_write('net.ipv6.neigh.default.gc_thresh1', size // 8)
# enable/disable IPv6 forwarding
tmp = dict_search('disable_forwarding', opt)
value = '0' if (tmp != None) else '1'
write_file('/proc/sys/net/ipv6/conf/all/forwarding', value)
# configure IPv6 strict-dad
tmp = dict_search('strict_dad', opt)
value = '2' if (tmp != None) else '1'
for root, dirs, files in os.walk('/proc/sys/net/ipv6/conf'):
for name in files:
if name == 'accept_dad':
write_file(os.path.join(root, name), value)
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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