#!/usr/bin/env python3 # # Copyright (C) 2023 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 argv from sys import exit from vyos.config import Config from vyos.template import render_to_string from vyos.utils.dict import dict_search 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() vrf_name = None if len(argv) > 1: vrf_name = argv[1] else: return None # Using duplicate L3VNIs makes no sense - it's also forbidden in FRR, # thus VyOS CLI must deny this, too. Instead of getting only the dict for # the requested VRF and den comparing it with depenent VRfs to not have any # duplicate we will just grad ALL VRFs by default but only render/apply # the configuration for the requested VRF - that makes the code easier and # hopefully less error prone vrf = conf.get_config_dict(['vrf'], key_mangling=('-', '_'), no_tag_node_value_mangle=True, get_first_key=True) # Store name of VRF we are interested in for FRR config rendering vrf.update({'only_vrf' : vrf_name}) return vrf def verify(vrf): if not vrf: return if len(argv) < 2: raise ConfigError('VRF parameter not specified when valling vrf_vni.py') if 'name' in vrf: vni_ids = [] for name, vrf_config in vrf['name'].items(): # VRF VNI (Virtual Network Identifier) must be unique on the system if 'vni' in vrf_config: if vrf_config['vni'] in vni_ids: raise ConfigError(f'VRF "{name}" VNI is not unique!') vni_ids.append(vrf_config['vni']) return None def generate(vrf): if not vrf: return vrf['new_frr_config'] = render_to_string('frr/zebra.vrf.route-map.frr.j2', vrf) return None def apply(vrf): frr_daemon = 'zebra' # add configuration to FRR frr_cfg = frr.FRRConfig() frr_cfg.load_configuration(frr_daemon) # There is only one VRF inside the dict as we read only one in get_config() if vrf and 'only_vrf' in vrf: vrf_name = vrf['only_vrf'] frr_cfg.modify_section(f'^vrf {vrf_name}', stop_pattern='^exit-vrf', remove_stop_mark=True) if vrf and 'new_frr_config' in vrf: frr_cfg.add_before(frr.default_add_before, vrf['new_frr_config']) frr_cfg.commit_configuration(frr_daemon) return None if __name__ == '__main__': try: c = get_config() verify(c) generate(c) apply(c) except ConfigError as e: print(e) exit(1)