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#!/usr/bin/env python3
#
# Copyright (C) 2019-2024 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/>.
from sys import exit
from vyos.config import Config
from vyos.configdep import set_dependents
from vyos.configdep import call_dependents
from vyos.configverify import has_frr_protocol_in_dict
from vyos.configverify import verify_route_map
from vyos.frrender import FRRender
from vyos.frrender import get_frrender_dict
from vyos.utils.dict import dict_search
from vyos.utils.process import is_systemd_service_active
from vyos.utils.process import is_systemd_service_running
from vyos.utils.system import sysctl_write
from vyos import ConfigError
from vyos import airbag
airbag.enable()
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
# If IPv4 ARP table size is set here and also manually in sysctl, the more
# fine grained value from sysctl must win
set_dependents('sysctl', conf)
return get_frrender_dict(conf)
def verify(config_dict):
if not has_frr_protocol_in_dict(config_dict, 'ip'):
return None
opt = config_dict['ip']
opt['policy'] = config_dict['policy']
if 'protocol' in opt:
for protocol, protocol_options in opt['protocol'].items():
if 'route_map' in protocol_options:
verify_route_map(protocol_options['route_map'], opt)
return
def generate(config_dict):
if config_dict and not is_systemd_service_running('vyos-configd.service'):
FRRender().generate(config_dict)
return None
def apply(config_dict):
if not has_frr_protocol_in_dict(config_dict, 'ip'):
return None
opt = config_dict['ip']
# Apply ARP threshold values
# table_size has a default value - thus the key always exists
size = int(dict_search('arp.table_size', opt))
# Amount upon reaching which the records begin to be cleared immediately
sysctl_write('net.ipv4.neigh.default.gc_thresh3', size)
# Amount after which the records begin to be cleaned after 5 seconds
sysctl_write('net.ipv4.neigh.default.gc_thresh2', size // 2)
# Minimum number of stored records is indicated which is not cleared
sysctl_write('net.ipv4.neigh.default.gc_thresh1', size // 8)
# configure multipath
tmp = dict_search('multipath.ignore_unreachable_nexthops', opt)
value = '1' if (tmp != None) else '0'
sysctl_write('net.ipv4.fib_multipath_use_neigh', value)
tmp = dict_search('multipath.layer4_hashing', opt)
value = '1' if (tmp != None) else '0'
sysctl_write('net.ipv4.fib_multipath_hash_policy', value)
# configure TCP options (defaults as of Linux 6.4)
tmp = dict_search('tcp.mss.probing', opt)
if tmp is None:
value = 0
elif tmp == 'on-icmp-black-hole':
value = 1
elif tmp == 'force':
value = 2
else:
# Shouldn't happen
raise ValueError("TCP MSS probing is neither 'on-icmp-black-hole' nor 'force'!")
sysctl_write('net.ipv4.tcp_mtu_probing', value)
tmp = dict_search('tcp.mss.base', opt)
value = '1024' if (tmp is None) else tmp
sysctl_write('net.ipv4.tcp_base_mss', value)
tmp = dict_search('tcp.mss.floor', opt)
value = '48' if (tmp is None) else tmp
sysctl_write('net.ipv4.tcp_mtu_probe_floor', value)
# During startup of vyos-router that brings up FRR, the service is not yet
# running when this script is called first. Skip this part and wait for initial
# commit of the configuration to trigger this statement
if is_systemd_service_active('frr.service'):
if config_dict and not is_systemd_service_running('vyos-configd.service'):
FRRender().apply()
call_dependents()
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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