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-rw-r--r--python/vyos/nat.py111
-rw-r--r--python/vyos/template.py5
2 files changed, 116 insertions, 0 deletions
diff --git a/python/vyos/nat.py b/python/vyos/nat.py
new file mode 100644
index 000000000..654afa424
--- /dev/null
+++ b/python/vyos/nat.py
@@ -0,0 +1,111 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 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/>.
+
+from vyos.template import is_ip_network
+from vyos.util import dict_search_args
+
+def parse_nat_rule(rule_conf, rule_id, nat_type):
+ output = []
+ log_prefix = ('DST' if nat_type == 'destination' else 'SRC') + f'-NAT-{rule_id}'
+ log_suffix = ''
+
+ ignore_type_addr = False
+ translation_str = ''
+
+ if 'inbound_interface' in rule_conf:
+ ifname = rule_conf['inbound_interface']
+ if ifname != 'any':
+ output.append(f'iifname "{ifname}"')
+
+ if 'outbound_interface' in rule_conf:
+ ifname = rule_conf['outbound_interface']
+ if ifname != 'any':
+ output.append(f'oifname "{ifname}"')
+
+ if 'protocol' in rule_conf and rule_conf['protocol'] != 'all':
+ protocol = rule_conf['protocol']
+ if protocol == 'tcp_udp':
+ protocol = '{ tcp, udp }'
+ output.append(f'ip protocol {protocol}')
+
+ if 'exclude' in rule_conf:
+ translation_str = 'return'
+ log_suffix = '-EXCL'
+ elif 'translation' in rule_conf:
+ translation_prefix = nat_type[:1]
+ translation_output = [f'{translation_prefix}nat']
+ addr = dict_search_args(rule_conf, 'translation', 'address')
+ port = dict_search_args(rule_conf, 'translation', 'port')
+
+ if addr and is_ip_network(addr):
+ map_addr = dict_search_args(rule_conf, nat_type, 'address')
+ translation_output.append(f'ip prefix to ip {translation_prefix}addr map {{ {map_addr} : {addr} }}')
+ ignore_type_addr = True
+ elif addr == 'masquerade':
+ if port:
+ addr = f'{addr} to '
+ translation_output = [addr]
+ log_suffix = '-MASQ'
+ else:
+ translation_output.append('to')
+ if addr:
+ translation_output.append(addr)
+
+ options = []
+ addr_mapping = dict_search_args(rule_conf, 'translation', 'options', 'address_mapping')
+ port_mapping = dict_search_args(rule_conf, 'translation', 'options', 'port_mapping')
+ if addr_mapping == 'persistent':
+ options.append('persistent')
+ if port_mapping and port_mapping != 'none':
+ options.append(port_mapping)
+
+ translation_str = " ".join(translation_output) + (f':{port}' if port else '')
+
+ if options:
+ translation_str += f' {",".join(options)}'
+
+ for target in ['source', 'destination']:
+ prefix = target[:1]
+ addr = dict_search_args(rule_conf, target, 'address')
+ if addr and not (ignore_type_addr and target == nat_type):
+ operator = ''
+ if addr[:1] == '!':
+ operator = '!='
+ addr = addr[1:]
+ output.append(f'ip {prefix}addr {operator} {addr}')
+
+ port = dict_search_args(rule_conf, target, 'port')
+ if port:
+ protocol = rule_conf['protocol']
+ if protocol == 'tcp_udp':
+ protocol = 'th'
+ operator = ''
+ if port[:1] == '!':
+ operator = '!='
+ port = port[1:]
+ output.append(f'{protocol} {prefix}port {operator} {{ {port} }}')
+
+ output.append('counter')
+
+ if 'log' in rule_conf:
+ output.append(f'log prefix "[{log_prefix}{log_suffix}]"')
+
+ if translation_str:
+ output.append(translation_str)
+
+ output.append(f'comment "{log_prefix}"')
+
+ return " ".join(output)
diff --git a/python/vyos/template.py b/python/vyos/template.py
index 0e79994f5..d9ff98d2e 100644
--- a/python/vyos/template.py
+++ b/python/vyos/template.py
@@ -616,6 +616,11 @@ def nft_nested_group(out_list, includes, groups, key):
add_includes(name)
return out_list
+@register_filter('nat_rule')
+def nat_rule(rule_conf, rule_id, nat_type, ipv6=False):
+ from vyos.nat import parse_nat_rule
+ return parse_nat_rule(rule_conf, rule_id, nat_type, ipv6)
+
@register_filter('range_to_regex')
def range_to_regex(num_range):
from vyos.range_regex import range_to_regex