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nat66.py
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nat66.py
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#!/usr/bin/env python3
#
# Copyright (C) 2020-2024 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/>.
import os
from sys import exit
from vyos.base import Warning
from vyos.config import Config
from vyos.configdep import set_dependents, call_dependents
from vyos.template import render
from vyos.utils.dict import dict_search
from vyos.utils.kernel import check_kmod
from vyos.utils.network import interface_exists
from vyos.utils.process import cmd
from vyos.template import is_ipv6
from vyos import ConfigError
from vyos import airbag
airbag.enable()
k_mod = ['nft_nat', 'nft_chain_nat']
nftables_nat66_config = '/run/nftables_nat66.nft'
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
base = ['nat66']
nat = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True)
set_dependents('conntrack', conf)
if not conf.exists(base):
nat['deleted'] = ''
return nat
def verify(nat):
if not nat or 'deleted' in nat:
# no need to verify the CLI as NAT66 is going to be deactivated
return None
if dict_search('source.rule', nat):
for rule, config in dict_search('source.rule', nat).items():
err_msg = f'Source NAT66 configuration error in rule {rule}:'
if 'outbound_interface' in config:
if 'name' in config['outbound_interface'] and 'group' in config['outbound_interface']:
raise ConfigError(f'{err_msg} cannot specify both interface group and interface name for nat source rule "{rule}"')
elif 'name' in config['outbound_interface']:
interface_name = config['outbound_interface']['name']
if interface_name not in 'any':
if interface_name.startswith('!'):
interface_name = interface_name[1:]
if not interface_exists(interface_name):
Warning(f'Interface "{interface_name}" for source NAT66 rule "{rule}" does not exist!')
addr = dict_search('translation.address', config)
if addr != None:
if addr != 'masquerade' and not is_ipv6(addr):
raise ConfigError(f'IPv6 address {addr} is not a valid address')
else:
if 'exclude' not in config:
raise ConfigError(f'{err_msg} translation address not specified')
prefix = dict_search('source.prefix', config)
if prefix != None:
if not is_ipv6(prefix):
raise ConfigError(f'{err_msg} source-prefix not specified')
if dict_search('destination.rule', nat):
for rule, config in dict_search('destination.rule', nat).items():
err_msg = f'Destination NAT66 configuration error in rule {rule}:'
if 'inbound_interface' in config:
if 'name' in config['inbound_interface'] and 'group' in config['inbound_interface']:
raise ConfigError(f'{err_msg} cannot specify both interface group and interface name for destination nat rule "{rule}"')
elif 'name' in config['inbound_interface']:
interface_name = config['inbound_interface']['name']
if interface_name not in 'any':
if interface_name.startswith('!'):
interface_name = interface_name[1:]
if not interface_exists(interface_name):
Warning(f'Interface "{interface_name}" for destination NAT66 rule "{rule}" does not exist!')
return None
def generate(nat):
if not os.path.exists(nftables_nat66_config):
nat['first_install'] = True
render(nftables_nat66_config, 'firewall/nftables-nat66.j2', nat, permission=0o755)
return None
def apply(nat):
if not nat:
return None
cmd(f'nft --file {nftables_nat66_config}')
call_dependents()
return None
if __name__ == '__main__':
try:
check_kmod(k_mod)
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)

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