diff options
Diffstat (limited to 'src/conf_mode/nat.py')
| -rwxr-xr-x | src/conf_mode/nat.py | 42 |
1 files changed, 25 insertions, 17 deletions
diff --git a/src/conf_mode/nat.py b/src/conf_mode/nat.py index 59939d0fb..85819a77e 100755 --- a/src/conf_mode/nat.py +++ b/src/conf_mode/nat.py @@ -1,6 +1,6 @@ #!/usr/bin/env python3 # -# Copyright (C) 2020-2021 VyOS maintainers and contributors +# Copyright (C) 2020-2022 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 @@ -23,11 +23,13 @@ from platform import release as kernel_version from sys import exit from netifaces import interfaces +from vyos.base import Warning from vyos.config import Config from vyos.configdict import dict_merge from vyos.template import render from vyos.template import is_ip_network from vyos.util import cmd +from vyos.util import run from vyos.util import check_kmod from vyos.util import dict_search from vyos.validate import is_addr_assigned @@ -42,7 +44,7 @@ if LooseVersion(kernel_version()) > LooseVersion('5.1'): else: k_mod = ['nft_nat', 'nft_chain_nat_ipv4'] -iptables_nat_config = '/tmp/vyos-nat-rules.nft' +nftables_nat_config = '/tmp/vyos-nat-rules.nft' def get_handler(json, chain, target): """ Get nftable rule handler number of given chain/target combination. @@ -93,7 +95,6 @@ def get_config(config=None): nat[direction]['rule'][rule] = dict_merge(default_values, nat[direction]['rule'][rule]) - # read in current nftable (once) for further processing tmp = cmd('nft -j list table raw') nftable_json = json.loads(tmp) @@ -106,9 +107,9 @@ def get_config(config=None): nat['helper_functions'] = 'remove' # Retrieve current table handler positions - nat['pre_ct_ignore'] = get_handler(condensed_json, 'PREROUTING', 'VYATTA_CT_HELPER') + nat['pre_ct_ignore'] = get_handler(condensed_json, 'PREROUTING', 'VYOS_CT_HELPER') nat['pre_ct_conntrack'] = get_handler(condensed_json, 'PREROUTING', 'NAT_CONNTRACK') - nat['out_ct_ignore'] = get_handler(condensed_json, 'OUTPUT', 'VYATTA_CT_HELPER') + nat['out_ct_ignore'] = get_handler(condensed_json, 'OUTPUT', 'VYOS_CT_HELPER') nat['out_ct_conntrack'] = get_handler(condensed_json, 'OUTPUT', 'NAT_CONNTRACK') nat['deleted'] = '' return nat @@ -119,10 +120,10 @@ def get_config(config=None): nat['helper_functions'] = 'add' # Retrieve current table handler positions - nat['pre_ct_ignore'] = get_handler(condensed_json, 'PREROUTING', 'VYATTA_CT_IGNORE') - nat['pre_ct_conntrack'] = get_handler(condensed_json, 'PREROUTING', 'VYATTA_CT_PREROUTING_HOOK') - nat['out_ct_ignore'] = get_handler(condensed_json, 'OUTPUT', 'VYATTA_CT_IGNORE') - nat['out_ct_conntrack'] = get_handler(condensed_json, 'OUTPUT', 'VYATTA_CT_OUTPUT_HOOK') + nat['pre_ct_ignore'] = get_handler(condensed_json, 'PREROUTING', 'VYOS_CT_IGNORE') + nat['pre_ct_conntrack'] = get_handler(condensed_json, 'PREROUTING', 'VYOS_CT_PREROUTING_HOOK') + nat['out_ct_ignore'] = get_handler(condensed_json, 'OUTPUT', 'VYOS_CT_IGNORE') + nat['out_ct_conntrack'] = get_handler(condensed_json, 'OUTPUT', 'VYOS_CT_OUTPUT_HOOK') return nat @@ -142,14 +143,14 @@ def verify(nat): raise ConfigError(f'{err_msg} outbound-interface not specified') if config['outbound_interface'] not in 'any' and config['outbound_interface'] not in interfaces(): - print(f'WARNING: rule "{rule}" interface "{config["outbound_interface"]}" does not exist on this system') + Warning(f'rule "{rule}" interface "{config["outbound_interface"]}" does not exist on this system') addr = dict_search('translation.address', config) if addr != None: if addr != 'masquerade' and not is_ip_network(addr): for ip in addr.split('-'): if not is_addr_assigned(ip): - print(f'WARNING: IP address {ip} does not exist on the system!') + Warning(f'IP address {ip} does not exist on the system!') elif 'exclude' not in config: raise ConfigError(f'{err_msg}\n' \ 'translation address not specified') @@ -167,7 +168,7 @@ def verify(nat): 'inbound-interface not specified') else: if config['inbound_interface'] not in 'any' and config['inbound_interface'] not in interfaces(): - print(f'WARNING: rule "{rule}" interface "{config["inbound_interface"]}" does not exist on this system') + Warning(f'rule "{rule}" interface "{config["inbound_interface"]}" does not exist on this system') if dict_search('translation.address', config) == None and 'exclude' not in config: @@ -180,14 +181,21 @@ def verify(nat): return None def generate(nat): - render(iptables_nat_config, 'firewall/nftables-nat.tmpl', nat, - permission=0o755) + render(nftables_nat_config, 'firewall/nftables-nat.j2', nat) + + # dry-run newly generated configuration + tmp = run(f'nft -c -f {nftables_nat_config}') + if tmp > 0: + if os.path.exists(nftables_nat_config): + os.unlink(nftables_nat_config) + raise ConfigError('Configuration file errors encountered!') + return None def apply(nat): - cmd(f'{iptables_nat_config}') - if os.path.isfile(iptables_nat_config): - os.unlink(iptables_nat_config) + cmd(f'nft -f {nftables_nat_config}') + if os.path.isfile(nftables_nat_config): + os.unlink(nftables_nat_config) return None |