#!/usr/bin/env python3 # # Copyright (C) 2021-2024 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 sys import exit from vyos.config import Config from vyos.config import config_dict_merge from vyos.configdict import dict_merge from vyos.configdict import node_changed from vyos.configverify import verify_access_list from vyos.configverify import verify_prefix_list from vyos.utils.dict import dict_search from vyos.template import render_to_string 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', 'babel'] babel = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True) # FRR has VRF support for different routing daemons. As interfaces belong # to VRFs - or the global VRF, we need to check for changed interfaces so # that they will be properly rendered for the FRR config. Also this eases # removal of interfaces from the running configuration. interfaces_removed = node_changed(conf, base + ['interface']) if interfaces_removed: babel['interface_removed'] = list(interfaces_removed) # Bail out early if configuration tree does not exist if not conf.exists(base): babel.update({'deleted' : ''}) return babel # We have gathered the dict representation of the CLI, but there are default # values which we need to update into the dictionary retrieved. default_values = conf.get_config_defaults(base, key_mangling=('-', '_'), get_first_key=True, recursive=True) # merge in default values babel = config_dict_merge(default_values, babel) # 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 babel = dict_merge(tmp, babel) return babel def verify(babel): if not babel: return None # verify distribute_list if "distribute_list" in babel: acl_keys = { "ipv4": [ "distribute_list.ipv4.access_list.in", "distribute_list.ipv4.access_list.out", ], "ipv6": [ "distribute_list.ipv6.access_list.in", "distribute_list.ipv6.access_list.out", ] } prefix_list_keys = { "ipv4": [ "distribute_list.ipv4.prefix_list.in", "distribute_list.ipv4.prefix_list.out", ], "ipv6":[ "distribute_list.ipv6.prefix_list.in", "distribute_list.ipv6.prefix_list.out", ] } for address_family in ["ipv4", "ipv6"]: for iface_key in babel["distribute_list"].get(address_family, {}).get("interface", {}).keys(): acl_keys[address_family].extend([ f"distribute_list.{address_family}.interface.{iface_key}.access_list.in", f"distribute_list.{address_family}.interface.{iface_key}.access_list.out" ]) prefix_list_keys[address_family].extend([ f"distribute_list.{address_family}.interface.{iface_key}.prefix_list.in", f"distribute_list.{address_family}.interface.{iface_key}.prefix_list.out" ]) for address_family, keys in acl_keys.items(): for key in keys: acl = dict_search(key, babel) if acl: verify_access_list(acl, babel, version='6' if address_family == 'ipv6' else '') for address_family, keys in prefix_list_keys.items(): for key in keys: prefix_list = dict_search(key, babel) if prefix_list: verify_prefix_list(prefix_list, babel, version='6' if address_family == 'ipv6' else '') def generate(babel): if not babel or 'deleted' in babel: return None babel['new_frr_config'] = render_to_string('frr/babeld.frr.j2', babel) return None def apply(babel): babel_daemon = 'babeld' # Save original configuration prior to starting any commit actions frr_cfg = frr.FRRConfig() frr_cfg.load_configuration(babel_daemon) frr_cfg.modify_section('^router babel', stop_pattern='^exit', remove_stop_mark=True) for key in ['interface', 'interface_removed']: if key not in babel: continue for interface in babel[key]: frr_cfg.modify_section(f'^interface {interface}', stop_pattern='^exit', remove_stop_mark=True) if 'new_frr_config' in babel: frr_cfg.add_before(frr.default_add_before, babel['new_frr_config']) frr_cfg.commit_configuration(babel_daemon) return None if __name__ == '__main__': try: c = get_config() verify(c) generate(c) apply(c) except ConfigError as e: print(e) exit(1)