nat66: T4626: Rewrite op-mode show nat66 rules

Rewrite op-mode "show nat66 source|destination rules" to the
new format
use "show_rules --direction <direction> --family <inet|inet6>"
Delete old script show_nat66_rules.py

2 files changed, 18 insertions, 115 deletions

diff --git a/src/op_mode/nat.py b/src/op_mode/nat.py
index 12fc4c782..2dffc378b 100755
--- a/src/op_mode/nat.py
+++ b/src/op_mode/nat.py
@@ -27,7 +27,7 @@ from vyos.util import dict_search
 import vyos.opmode
 
 
-def _get_json_data(direction):
+def _get_json_data(direction, family):
     """
     Get NAT format JSON
     """
@@ -35,14 +35,15 @@ def _get_json_data(direction):
         chain = 'POSTROUTING'
     if direction == 'destination':
         chain = 'PREROUTING'
-    return cmd(f'sudo nft --json list chain ip nat {chain}')
+    family = 'ip6' if family == 'inet6' else 'ip'
+    return cmd(f'sudo nft --json list chain {family} nat {chain}')
 
 
-def _get_raw_data_rules(direction):
+def _get_raw_data_rules(direction, family):
     """Get interested rules
     :returns dict
     """
-    data = _get_json_data(direction)
+    data = _get_json_data(direction, family)
     data_dict = json.loads(data)
     rules = []
     for rule in data_dict['nftables']:
@@ -51,10 +52,12 @@ def _get_raw_data_rules(direction):
     return rules
 
 
-def _get_formatted_output_rules(data, direction):
+def _get_formatted_output_rules(data, direction, family):
     # Add default values before loop
     sport, dport, proto = 'any', 'any', 'any'
-    saddr, daddr = '0.0.0.0/0', '0.0.0.0/0'
+    saddr = '::/0' if family == 'inet6' else '0.0.0.0/0'
+    daddr = '::/0' if family == 'inet6' else '0.0.0.0/0'
+
     data_entries = []
     for rule in data:
         if 'comment' in rule['rule']:
@@ -69,11 +72,13 @@ def _get_formatted_output_rules(data, direction):
                 if 'prefix' in match['right'] or 'set' in match['right']:
                     # Merge dict src/dst l3_l4 parameters
                     my_dict = {**match['left']['payload'], **match['right']}
+                    my_dict['op'] = match['op']
+                    op = '!' if my_dict.get('op') == '!=' else ''
                     proto = my_dict.get('protocol').upper()
                     if my_dict['field'] == 'saddr':
-                        saddr = f'{my_dict["prefix"]["addr"]}/{my_dict["prefix"]["len"]}'
+                        saddr = f'{op}{my_dict["prefix"]["addr"]}/{my_dict["prefix"]["len"]}'
                     elif my_dict['field'] == 'daddr':
-                        daddr = f'{my_dict["prefix"]["addr"]}/{my_dict["prefix"]["len"]}'
+                        daddr = f'{op}{my_dict["prefix"]["addr"]}/{my_dict["prefix"]["len"]}'
                     elif my_dict['field'] == 'sport':
                         # Port range or single port
                         if jmespath.search('set[*].range', my_dict):
@@ -96,8 +101,8 @@ def _get_formatted_output_rules(data, direction):
                     if jmespath.search('left.payload.field', match) == 'daddr':
                         daddr = match.get('right')
             else:
-                saddr = '0.0.0.0/0'
-                daddr = '0.0.0.0/0'
+                saddr = '::/0' if family == 'inet6' else '0.0.0.0/0'
+                daddr = '::/0' if family == 'inet6' else '0.0.0.0/0'
                 sport = 'any'
                 dport = 'any'
                 proto = 'any'
@@ -175,12 +180,12 @@ def _get_formatted_output_statistics(data, direction):
     return output
 
 
-def show_rules(raw: bool, direction: str):
-    nat_rules = _get_raw_data_rules(direction)
+def show_rules(raw: bool, direction: str, family: str):
+    nat_rules = _get_raw_data_rules(direction, family)
     if raw:
         return nat_rules
     else:
-        return _get_formatted_output_rules(nat_rules, direction)
+        return _get_formatted_output_rules(nat_rules, direction, family)
 
 
 def show_statistics(raw: bool, direction: str):
diff --git a/src/op_mode/show_nat66_rules.py b/src/op_mode/show_nat66_rules.py
deleted file mode 100755
index 967ec9d37..000000000
--- a/src/op_mode/show_nat66_rules.py
+++ /dev/null
@@ -1,102 +0,0 @@
-#!/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_json = dict_search('snat.addr' if args.source else 'dnat.addr', data['expr'][3])
-        if tran_addr_json:
-            if isinstance(srcdest_json,str):
-                tran_addr = tran_addr_json
-
-            if 'prefix' in tran_addr_json:
-                addr_tmp = dict_search('snat.addr.prefix.addr' if args.source else 'dnat.addr.prefix.addr', data['expr'][3])
-                len_tmp = dict_search('snat.addr.prefix.len' if args.source else 'dnat.addr.prefix.len', data['expr'][3])
-                if addr_tmp:
-                    tran_addr = addr_tmp + '/' + str(len_tmp)
-        else:
-            if 'masquerade' in data['expr'][3]:
-                tran_addr = 'masquerade'
-        
-        print(format_nat66_rule.format(rule, srcdest, tran_addr, interface))
-    
-    exit(0)
-else:
-    parser.print_help()
-    exit(1)
-