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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
from sys import exit
from copy import deepcopy
from vyos.config import Config
from vyos import ConfigError
from vyos.util import call
from vyos import airbag
airbag.enable()
default_config_data = {
'arp_table': 8192,
'ipv4_forward': '1',
'mp_unreach_nexthop': '0',
'mp_layer4_hashing': '0'
}
def sysctl(name, value):
call('sysctl -wq {}={}'.format(name, value))
def get_config():
ip_opt = deepcopy(default_config_data)
conf = Config()
conf.set_level('system ip')
if conf.exists(''):
if conf.exists('arp table-size'):
ip_opt['arp_table'] = int(conf.return_value('arp table-size'))
if conf.exists('disable-forwarding'):
ip_opt['ipv4_forward'] = '0'
if conf.exists('multipath ignore-unreachable-nexthops'):
ip_opt['mp_unreach_nexthop'] = '1'
if conf.exists('multipath layer4-hashing'):
ip_opt['mp_layer4_hashing'] = '1'
return ip_opt
def verify(ip_opt):
pass
def generate(ip_opt):
pass
def apply(ip_opt):
# apply ARP threshold values
sysctl('net.ipv4.neigh.default.gc_thresh3', ip_opt['arp_table'])
sysctl('net.ipv4.neigh.default.gc_thresh2', ip_opt['arp_table'] // 2)
sysctl('net.ipv4.neigh.default.gc_thresh1', ip_opt['arp_table'] // 8)
# enable/disable IPv4 forwarding
with open('/proc/sys/net/ipv4/conf/all/forwarding', 'w') as f:
f.write(ip_opt['ipv4_forward'])
# configure multipath
sysctl('net.ipv4.fib_multipath_use_neigh', ip_opt['mp_unreach_nexthop'])
sysctl('net.ipv4.fib_multipath_hash_policy', ip_opt['mp_layer4_hashing'])
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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