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show_nat66_rules.py
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show_nat66_rules.py
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#!/usr/bin/env python3
#
# Copyright (C) 2021 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 jmespath
import json
from argparse import ArgumentParser
from jinja2 import Template
from sys import exit
from vyos.util import cmd
from vyos.util import dict_search
parser = ArgumentParser()
group = parser.add_mutually_exclusive_group()
group.add_argument("--source", help="Show statistics for configured source NAT rules", action="store_true")
group.add_argument("--destination", help="Show statistics for configured destination NAT rules", action="store_true")
args = parser.parse_args()
if args.source or args.destination:
tmp = cmd('sudo nft -j list table ip6 nat')
tmp = json.loads(tmp)
format_nat66_rule = '{0: <10} {1: <50} {2: <50} {3: <10}'
print(format_nat66_rule.format("Rule", "Source" if args.source else "Destination", "Translation", "Outbound Interface" if args.source else "Inbound Interface"))
print(format_nat66_rule.format("----", "------" if args.source else "-----------", "-----------", "------------------" if args.source else "-----------------"))
data_json = jmespath.search('nftables[?rule].rule[?chain]', tmp)
for idx in range(0, len(data_json)):
data = data_json[idx]
# The following key values must exist
# When the rule JSON does not have some keys, this is not a rule we can work with
continue_rule = False
for key in ['comment', 'chain', 'expr']:
if key not in data:
continue_rule = True
continue
if continue_rule:
continue
comment = data['comment']
# Check the annotation to see if the annotation format is created by VYOS
continue_rule = True
for comment_prefix in ['SRC-NAT66-', 'DST-NAT66-']:
if comment_prefix in comment:
continue_rule = False
if continue_rule:
continue
# When log is detected from the second index of expr, then this rule should be ignored
if 'log' in data['expr'][2]:
continue
rule = comment.replace('SRC-NAT66-','')
rule = rule.replace('DST-NAT66-','')
chain = data['chain']
if not (args.source and chain == 'POSTROUTING') or (not args.source and chain == 'PREROUTING'):
continue
interface = dict_search('match.right', data['expr'][0])
srcdest = dict_search('match.right.prefix.addr', data['expr'][2])
if srcdest:
addr_tmp = dict_search('match.right.prefix.len', data['expr'][2])
if addr_tmp:
srcdest = srcdest + '/' + str(addr_tmp)
else:
srcdest = dict_search('match.right', data['expr'][2])
tran_addr = dict_search('snat.addr.prefix.addr' if args.source else 'dnat.addr.prefix.addr', data['expr'][3])
if tran_addr:
addr_tmp = dict_search('snat.addr.prefix.len' if args.source else 'dnat.addr.prefix.len', data['expr'][3])
if addr_tmp:
srcdest = srcdest + '/' + str(addr_tmp)
else:
if 'masquerade' in data['expr'][3]:
tran_addr = 'masquerade'
else:
tran_addr = dict_search('snat.addr' if args.source else 'dnat.addr', data['expr'][3])
print(format_nat66_rule.format(rule, srcdest, tran_addr, interface))
exit(0)
else:
parser.print_help()
exit(1)

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