#!/usr/bin/env python3 # # Copyright (C) 2020-2021 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 os from sys import exit from netifaces import interfaces from vyos.config import Config from vyos.configdict import dict_merge from vyos.configdict import node_changed from vyos.configdict import leaf_node_changed from vyos.template import render from vyos.util import call from vyos import ConfigError from vyos import airbag airbag.enable() def get_config(config=None): if config: conf = config else: conf = Config() base = ['policy'] pbr = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True) for route in ['local_route', 'local_route6']: dict_id = 'rule_remove' if route == 'local_route' else 'rule6_remove' route_key = 'local-route' if route == 'local_route' else 'local-route6' base_rule = base + [route_key, 'rule'] # delete policy local-route dict = {} tmp = node_changed(conf, base_rule, key_mangling=('-', '_')) if tmp: for rule in (tmp or []): src = leaf_node_changed(conf, base_rule + [rule, 'source']) fwmk = leaf_node_changed(conf, base_rule + [rule, 'fwmark']) iif = leaf_node_changed(conf, base_rule + [rule, 'inbound-interface']) dst = leaf_node_changed(conf, base_rule + [rule, 'destination']) rule_def = {} if src: rule_def = dict_merge({'source' : src}, rule_def) if fwmk: rule_def = dict_merge({'fwmark' : fwmk}, rule_def) if iif: rule_def = dict_merge({'inbound_interface' : iif}, rule_def) if dst: rule_def = dict_merge({'destination' : dst}, rule_def) dict = dict_merge({dict_id : {rule : rule_def}}, dict) pbr.update(dict) if not route in pbr: continue # delete policy local-route rule x source x.x.x.x # delete policy local-route rule x fwmark x # delete policy local-route rule x destination x.x.x.x if 'rule' in pbr[route]: for rule, rule_config in pbr[route]['rule'].items(): src = leaf_node_changed(conf, base_rule + [rule, 'source']) fwmk = leaf_node_changed(conf, base_rule + [rule, 'fwmark']) iif = leaf_node_changed(conf, base_rule + [rule, 'inbound-interface']) dst = leaf_node_changed(conf, base_rule + [rule, 'destination']) # keep track of changes in configuration # otherwise we might remove an existing node although nothing else has changed changed = False rule_def = {} # src is None if there are no changes to src if src is None: # if src hasn't changed, include it in the removal selector # if a new selector is added, we have to remove all previous rules without this selector # to make sure we remove all previous rules with this source(s), it will be included if 'source' in rule_config: rule_def = dict_merge({'source': rule_config['source']}, rule_def) else: # if src is not None, it's previous content will be returned # this can be an empty array if it's just being set, or the previous value # either way, something has to be changed and we only want to remove previous values changed = True # set the old value for removal if it's not empty if len(src) > 0: rule_def = dict_merge({'source' : src}, rule_def) if fwmk is None: if 'fwmark' in rule_config: rule_def = dict_merge({'fwmark': rule_config['fwmark']}, rule_def) else: changed = True if len(fwmk) > 0: rule_def = dict_merge({'fwmark' : fwmk}, rule_def) if iif is None: if 'inbound_interface' in rule_config: rule_def = dict_merge({'inbound_interface': rule_config['inbound_interface']}, rule_def) else: changed = True if len(iif) > 0: rule_def = dict_merge({'inbound_interface' : iif}, rule_def) if dst is None: if 'destination' in rule_config: rule_def = dict_merge({'destination': rule_config['destination']}, rule_def) else: changed = True if len(dst) > 0: rule_def = dict_merge({'destination' : dst}, rule_def) if changed: dict = dict_merge({dict_id : {rule : rule_def}}, dict) pbr.update(dict) return pbr def verify(pbr): # bail out early - looks like removal from running config if not pbr: return None for route in ['local_route', 'local_route6']: if not route in pbr: continue pbr_route = pbr[route] if 'rule' in pbr_route: for rule in pbr_route['rule']: if 'source' not in pbr_route['rule'][rule] \ and 'destination' not in pbr_route['rule'][rule] \ and 'fwmark' not in pbr_route['rule'][rule] \ and 'inbound_interface' not in pbr_route['rule'][rule]: raise ConfigError('Source or destination address or fwmark or inbound-interface is required!') else: if 'set' not in pbr_route['rule'][rule] or 'table' not in pbr_route['rule'][rule]['set']: raise ConfigError('Table set is required!') if 'inbound_interface' in pbr_route['rule'][rule]: interface = pbr_route['rule'][rule]['inbound_interface'] if interface not in interfaces(): raise ConfigError(f'Interface "{interface}" does not exist') return None def generate(pbr): if not pbr: return None return None def apply(pbr): if not pbr: return None # Delete old rule if needed for rule_rm in ['rule_remove', 'rule6_remove']: if rule_rm in pbr: v6 = " -6" if rule_rm == 'rule6_remove' else "" for rule, rule_config in pbr[rule_rm].items(): rule_config['source'] = rule_config['source'] if 'source' in rule_config else [''] for src in rule_config['source']: f_src = '' if src == '' else f' from {src} ' rule_config['destination'] = rule_config['destination'] if 'destination' in rule_config else [''] for dst in rule_config['destination']: f_dst = '' if dst == '' else f' to {dst} ' rule_config['fwmark'] = rule_config['fwmark'] if 'fwmark' in rule_config else [''] for fwmk in rule_config['fwmark']: f_fwmk = '' if fwmk == '' else f' fwmark {fwmk} ' rule_config['inbound_interface'] = rule_config['inbound_interface'] if 'inbound_interface' in rule_config else [''] for iif in rule_config['inbound_interface']: f_iif = '' if iif == '' else f' iif {iif} ' call(f'ip{v6} rule del prio {rule} {f_src}{f_dst}{f_fwmk}{f_iif}') # Generate new config for route in ['local_route', 'local_route6']: if not route in pbr: continue v6 = " -6" if route == 'local_route6' else "" pbr_route = pbr[route] if 'rule' in pbr_route: for rule, rule_config in pbr_route['rule'].items(): table = rule_config['set']['table'] rule_config['source'] = rule_config['source'] if 'source' in rule_config else ['all'] for src in rule_config['source'] or ['all']: f_src = '' if src == '' else f' from {src} ' rule_config['destination'] = rule_config['destination'] if 'destination' in rule_config else ['all'] for dst in rule_config['destination']: f_dst = '' if dst == '' else f' to {dst} ' f_fwmk = '' if 'fwmark' in rule_config: fwmk = rule_config['fwmark'] f_fwmk = f' fwmark {fwmk} ' f_iif = '' if 'inbound_interface' in rule_config: iif = rule_config['inbound_interface'] f_iif = f' iif {iif} ' call(f'ip{v6} rule add prio {rule} {f_src}{f_dst}{f_fwmk}{f_iif} lookup {table}') return None if __name__ == '__main__': try: c = get_config() verify(c) generate(c) apply(c) except ConfigError as e: print(e) exit(1)