#!/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 vyos.config import Config from vyos.configdict import dict_merge from vyos.configdict import node_changed from vyos.configverify import verify_common_route_maps from vyos.configverify import verify_interface_exists from vyos.ifconfig import Interface from vyos.util import dict_search from vyos.util import get_interface_config from vyos.template import render_to_string from vyos.xml import defaults from vyos import ConfigError from vyos import frr from vyos import airbag airbag.enable() def get_config(config=None): if config: conf = config else: conf = Config() base = ['protocols', 'isis'] isis = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True) interfaces_removed = node_changed(conf, base + ['interface']) if interfaces_removed: isis['interface_removed'] = list(interfaces_removed) # Bail out early if configuration tree does not exist if not conf.exists(base): isis.update({'deleted' : ''}) return isis # We have gathered the dict representation of the CLI, but there are default # options which we need to update into the dictionary retrived. # XXX: Note that we can not call defaults(base), as defaults does not work # on an instance of a tag node. default_values = defaults(base) # merge in default values isis = dict_merge(default_values, isis) # We also need some additional information from the config, prefix-lists # and route-maps for instance. They will be used in verify(). # # XXX: one MUST always call this without the key_mangling() option! See # vyos.configverify.verify_common_route_maps() for more information. tmp = conf.get_config_dict(['policy']) # Merge policy dict into "regular" config dict isis = dict_merge(tmp, isis) return isis def verify(isis): # bail out early - looks like removal from running config if not isis or 'deleted' in isis: return None if 'net' not in isis: raise ConfigError('Network entity is mandatory!') # last byte in IS-IS area address must be 0 tmp = isis['net'].split('.') if int(tmp[-1]) != 0: raise ConfigError('Last byte of IS-IS network entity title must always be 0!') verify_common_route_maps(isis) # If interface not set if 'interface' not in isis: raise ConfigError('Interface used for routing updates is mandatory!') for interface in isis['interface']: verify_interface_exists(interface) # Interface MTU must be >= configured lsp-mtu mtu = Interface(interface).get_mtu() area_mtu = isis['lsp_mtu'] # Recommended maximum PDU size = interface MTU - 3 bytes recom_area_mtu = mtu - 3 if mtu < int(area_mtu) or int(area_mtu) > recom_area_mtu: raise ConfigError(f'Interface {interface} has MTU {mtu}, ' \ f'current area MTU is {area_mtu}! \n' \ f'Recommended area lsp-mtu {recom_area_mtu} or less ' \ '(calculated on MTU size).') # If md5 and plaintext-password set at the same time for password in ['area_password', 'domain_password']: if password in isis: if {'md5', 'plaintext_password'} <= set(isis[password]): tmp = password.replace('_', '-') raise ConfigError(f'Can use either md5 or plaintext-password for {tmp}!') # If one param from delay set, but not set others if 'spf_delay_ietf' in isis: required_timers = ['holddown', 'init_delay', 'long_delay', 'short_delay', 'time_to_learn'] exist_timers = [] for elm_timer in required_timers: if elm_timer in isis['spf_delay_ietf']: exist_timers.append(elm_timer) exist_timers = set(required_timers).difference(set(exist_timers)) if len(exist_timers) > 0: raise ConfigError('All types of delay must be specified: ' + ', '.join(exist_timers).replace('_', '-')) # If Redistribute set, but level don't set if 'redistribute' in isis: proc_level = isis.get('level','').replace('-','_') for afi in ['ipv4', 'ipv6']: if afi not in isis['redistribute']: continue for proto, proto_config in isis['redistribute'][afi].items(): if 'level_1' not in proto_config and 'level_2' not in proto_config: raise ConfigError(f'Redistribute level-1 or level-2 should be specified in ' \ f'"protocols isis {process} redistribute {afi} {proto}"!') for redistr_level, redistr_config in proto_config.items(): if proc_level and proc_level != 'level_1_2' and proc_level != redistr_level: raise ConfigError(f'"protocols isis {process} redistribute {afi} {proto} {redistr_level}" ' \ f'can not be used with \"protocols isis {process} level {proc_level}\"') # Segment routing checks if dict_search('segment_routing.global_block', isis): high_label_value = dict_search('segment_routing.global_block.high_label_value', isis) low_label_value = dict_search('segment_routing.global_block.low_label_value', isis) # If segment routing global block high value is blank, throw error if (low_label_value and not high_label_value) or (high_label_value and not low_label_value): raise ConfigError('Segment routing global block requires both low and high value!') # If segment routing global block low value is higher than the high value, throw error if int(low_label_value) > int(high_label_value): raise ConfigError('Segment routing global block low value must be lower than high value') if dict_search('segment_routing.local_block', isis): high_label_value = dict_search('segment_routing.local_block.high_label_value', isis) low_label_value = dict_search('segment_routing.local_block.low_label_value', isis) # If segment routing local block high value is blank, throw error if (low_label_value and not high_label_value) or (high_label_value and not low_label_value): raise ConfigError('Segment routing local block requires both high and low value!') # If segment routing local block low value is higher than the high value, throw error if int(low_label_value) > int(high_label_value): raise ConfigError('Segment routing local block low value must be lower than high value') return None def generate(isis): if not isis or 'deleted' in isis: isis['frr_isisd_config'] = '' isis['frr_zebra_config'] = '' return None isis['protocol'] = 'isis' # required for frr/route-map.frr.tmpl isis['frr_zebra_config'] = render_to_string('frr/route-map.frr.tmpl', isis) isis['frr_isisd_config'] = render_to_string('frr/isisd.frr.tmpl', isis) return None def apply(isis): isis_daemon = 'isisd' zebra_daemon = 'zebra' # Save original configuration prior to starting any commit actions frr_cfg = frr.FRRConfig() # The route-map used for the FIB (zebra) is part of the zebra daemon frr_cfg.load_configuration(zebra_daemon) frr_cfg.modify_section(r'(\s+)?ip protocol isis route-map [-a-zA-Z0-9.]+$', '', '(\s|!)') frr_cfg.add_before(r'(ip prefix-list .*|route-map .*|line vty)', isis['frr_zebra_config']) frr_cfg.commit_configuration(zebra_daemon) frr_cfg.load_configuration(isis_daemon) frr_cfg.modify_section(f'^router isis VyOS$', '') for key in ['interface', 'interface_removed']: if key not in isis: continue for interface in isis[key]: frr_cfg.modify_section(f'^interface {interface}$', '') frr_cfg.add_before(r'(ip prefix-list .*|route-map .*|line vty)', isis['frr_isisd_config']) frr_cfg.commit_configuration(isis_daemon) # Save configuration to /run/frr/config/frr.conf frr.save_configuration() return None if __name__ == '__main__': try: c = get_config() verify(c) generate(c) apply(c) except ConfigError as e: print(e) exit(1)