#!/usr/bin/env python3 # # Copyright (C) 2020-2023 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 . from sys import exit from sys import argv from vyos.base import Warning from vyos.config import Config from vyos.configdict import dict_merge from vyos.configdict import node_changed from vyos.configverify import verify_prefix_list from vyos.configverify import verify_route_map from vyos.configverify import verify_vrf from vyos.template import is_ip from vyos.template import is_interface from vyos.template import render_to_string from vyos.utils.dict import dict_search from vyos.utils.network import get_interface_vrf from vyos.validate import is_addr_assigned 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 = None if len(argv) > 1: vrf = argv[1] base_path = ['protocols', 'bgp'] # eqivalent of the C foo ? 'a' : 'b' statement base = vrf and ['vrf', 'name', vrf, 'protocols', 'bgp'] or base_path bgp = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True, no_tag_node_value_mangle=True) bgp['dependent_vrfs'] = conf.get_config_dict(['vrf', 'name'], key_mangling=('-', '_'), get_first_key=True, no_tag_node_value_mangle=True) # Remove per interface MPLS configuration - get a list if changed # nodes under the interface tagNode interfaces_removed = node_changed(conf, base + ['interface']) if interfaces_removed: bgp['interface_removed'] = list(interfaces_removed) # Assign the name of our VRF context. This MUST be done before the return # statement below, else on deletion we will delete the default instance # instead of the VRF instance. if vrf: bgp.update({'vrf' : vrf}) # We can not delete the BGP VRF instance if there is a L3VNI configured tmp = ['vrf', 'name', vrf, 'vni'] if conf.exists(tmp): bgp.update({'vni' : conf.return_value(tmp)}) # We can safely delete ourself from the dependent vrf list if vrf in bgp['dependent_vrfs']: del bgp['dependent_vrfs'][vrf] bgp['dependent_vrfs'].update({'default': {'protocols': { 'bgp': conf.get_config_dict(base_path, key_mangling=('-', '_'), get_first_key=True, no_tag_node_value_mangle=True)}}}) if not conf.exists(base): # If bgp instance is deleted then mark it bgp.update({'deleted' : ''}) return bgp # 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 bgp = dict_merge(tmp, bgp) return bgp def verify_vrf_as_import(search_vrf_name: str, afi_name: str, vrfs_config: dict) -> bool: """ :param search_vrf_name: search vrf name in import list :type search_vrf_name: str :param afi_name: afi/safi name :type afi_name: str :param vrfs_config: configuration dependents vrfs :type vrfs_config: dict :return: if vrf in import list retrun true else false :rtype: bool """ for vrf_name, vrf_config in vrfs_config.items(): import_list = dict_search( f'protocols.bgp.address_family.{afi_name}.import.vrf', vrf_config) if import_list: if search_vrf_name in import_list: return True return False def verify_vrf_import_options(afi_config: dict) -> bool: """ Search if afi contains one of options :param afi_config: afi/safi :type afi_config: dict :return: if vrf contains rd and route-target options return true else false :rtype: bool """ options = [ f'rd.vpn.export', f'route_target.vpn.import', f'route_target.vpn.export', f'route_target.vpn.both' ] for option in options: if dict_search(option, afi_config): return True return False def verify_vrf_import(vrf_name: str, vrfs_config: dict, afi_name: str) -> bool: """ Verify if vrf exists and contain options :param vrf_name: name of VRF :type vrf_name: str :param vrfs_config: dependent vrfs config :type vrfs_config: dict :param afi_name: afi/safi name :type afi_name: str :return: if vrf contains rd and route-target options return true else false :rtype: bool """ if vrf_name != 'default': verify_vrf({'vrf': vrf_name}) if dict_search(f'{vrf_name}.protocols.bgp.address_family.{afi_name}', vrfs_config): afi_config = \ vrfs_config[vrf_name]['protocols']['bgp']['address_family'][ afi_name] if verify_vrf_import_options(afi_config): return True return False def verify_vrflist_import(afi_name: str, afi_config: dict, vrfs_config: dict) -> bool: """ Call function to verify if scpecific vrf contains rd and route-target options return true else false :param afi_name: afi/safi name :type afi_name: str :param afi_config: afi/safi configuration :type afi_config: dict :param vrfs_config: dependent vrfs config :type vrfs_config:dict :return: if vrf contains rd and route-target options return true else false :rtype: bool """ for vrf_name in afi_config['import']['vrf']: if verify_vrf_import(vrf_name, vrfs_config, afi_name): return True return False def verify_remote_as(peer_config, bgp_config): if 'remote_as' in peer_config: return peer_config['remote_as'] if 'peer_group' in peer_config: peer_group_name = peer_config['peer_group'] tmp = dict_search(f'peer_group.{peer_group_name}.remote_as', bgp_config) if tmp: return tmp if 'interface' in peer_config: if 'remote_as' in peer_config['interface']: return peer_config['interface']['remote_as'] if 'peer_group' in peer_config['interface']: peer_group_name = peer_config['interface']['peer_group'] tmp = dict_search(f'peer_group.{peer_group_name}.remote_as', bgp_config) if tmp: return tmp if 'v6only' in peer_config['interface']: if 'remote_as' in peer_config['interface']['v6only']: return peer_config['interface']['v6only']['remote_as'] return None def verify_afi(peer_config, bgp_config): # If address_family configured under neighboor if 'address_family' in peer_config: return True # If address_family configured under peer-group # if neighbor interface configured peer_group_name = '' if dict_search('interface.peer_group', peer_config): peer_group_name = peer_config['interface']['peer_group'] # if neighbor IP configured. if 'peer_group' in peer_config: peer_group_name = peer_config['peer_group'] if peer_group_name: tmp = dict_search(f'peer_group.{peer_group_name}.address_family', bgp_config) if tmp: return True return False def verify(bgp): if 'deleted' in bgp: if 'vrf' in bgp: # Cannot delete vrf if it exists in import vrf list in other vrfs for tmp_afi in ['ipv4_unicast', 'ipv6_unicast']: if verify_vrf_as_import(bgp['vrf'], tmp_afi, bgp['dependent_vrfs']): raise ConfigError(f'Cannot delete VRF instance "{bgp["vrf"]}", ' \ 'unconfigure "import vrf" commands!') # We can not delete the BGP instance if a L3VNI instance exists if 'vni' in bgp: raise ConfigError(f'Cannot delete VRF instance "{bgp["vrf"]}", ' \ f'unconfigure VNI "{bgp["vni"]}" first!') else: # We are running in the default VRF context, thus we can not delete # our main BGP instance if there are dependent BGP VRF instances. if 'dependent_vrfs' in bgp: for vrf, vrf_options in bgp['dependent_vrfs'].items(): if vrf != 'default': if dict_search('protocols.bgp', vrf_options): raise ConfigError('Cannot delete default BGP instance, ' \ 'dependent VRF instance(s) exist!') return None if 'system_as' not in bgp: raise ConfigError('BGP system-as number must be defined!') # Verify vrf on interface and bgp section if 'interface' in bgp: for interface in bgp['interface']: error_msg = f'Interface "{interface}" belongs to different VRF instance' tmp = get_interface_vrf(interface) if 'vrf' in bgp: if bgp['vrf'] != tmp: vrf = bgp['vrf'] raise ConfigError(f'{error_msg} "{vrf}"!') elif tmp != 'default': raise ConfigError(f'{error_msg} "{tmp}"!') # Common verification for both peer-group and neighbor statements for neighbor in ['neighbor', 'peer_group']: # bail out early if there is no neighbor or peer-group statement # this also saves one indention level if neighbor not in bgp: continue for peer, peer_config in bgp[neighbor].items(): # Only regular "neighbor" statement can have a peer-group set # Check if the configure peer-group exists if 'peer_group' in peer_config: peer_group = peer_config['peer_group'] if 'peer_group' not in bgp or peer_group not in bgp['peer_group']: raise ConfigError(f'Specified peer-group "{peer_group}" for '\ f'neighbor "{neighbor}" does not exist!') if 'local_role' in peer_config: #Ensure Local Role has only one value. if len(peer_config['local_role']) > 1: raise ConfigError(f'Only one local role can be specified for peer "{peer}"!') if 'local_as' in peer_config: if len(peer_config['local_as']) > 1: raise ConfigError(f'Only one local-as number can be specified for peer "{peer}"!') # Neighbor local-as override can not be the same as the local-as # we use for this BGP instane! asn = list(peer_config['local_as'].keys())[0] if asn == bgp['system_as']: raise ConfigError('Cannot have local-as same as system-as number') # Neighbor AS specified for local-as and remote-as can not be the same if dict_search('remote_as', peer_config) == asn: raise ConfigError(f'Neighbor "{peer}" has local-as specified which is '\ 'the same as remote-as, this is not allowed!') # ttl-security and ebgp-multihop can't be used in the same configration if 'ebgp_multihop' in peer_config and 'ttl_security' in peer_config: raise ConfigError('You can not set both ebgp-multihop and ttl-security hops') # interface and ebgp-multihop can't be used in the same configration if 'ebgp_multihop' in peer_config and 'interface' in peer_config: raise ConfigError(f'Ebgp-multihop can not be used with directly connected '\ f'neighbor "{peer}"') # Check if neighbor has both override capability and strict capability match # configured at the same time. if 'override_capability' in peer_config and 'strict_capability_match' in peer_config: raise ConfigError(f'Neighbor "{peer}" cannot have both override-capability and '\ 'strict-capability-match configured at the same time!') # Check spaces in the password if 'password' in peer_config and ' ' in peer_config['password']: raise ConfigError('Whitespace is not allowed in passwords!') # Some checks can/must only be done on a neighbor and not a peer-group if neighbor == 'neighbor': # remote-as must be either set explicitly for the neighbor # or for the entire peer-group if not verify_remote_as(peer_config, bgp): raise ConfigError(f'Neighbor "{peer}" remote-as must be set!') if not verify_afi(peer_config, bgp): Warning(f'BGP neighbor "{peer}" requires address-family!') # Peer-group member cannot override remote-as of peer-group if 'peer_group' in peer_config: peer_group = peer_config['peer_group'] if 'remote_as' in peer_config and 'remote_as' in bgp['peer_group'][peer_group]: raise ConfigError(f'Peer-group member "{peer}" cannot override remote-as of peer-group "{peer_group}"!') if 'interface' in peer_config: if 'peer_group' in peer_config['interface']: peer_group = peer_config['interface']['peer_group'] if 'remote_as' in peer_config['interface'] and 'remote_as' in bgp['peer_group'][peer_group]: raise ConfigError(f'Peer-group member "{peer}" cannot override remote-as of peer-group "{peer_group}"!') if 'v6only' in peer_config['interface']: if 'peer_group' in peer_config['interface']['v6only']: peer_group = peer_config['interface']['v6only']['peer_group'] if 'remote_as' in peer_config['interface']['v6only'] and 'remote_as' in bgp['peer_group'][peer_group]: raise ConfigError(f'Peer-group member "{peer}" cannot override remote-as of peer-group "{peer_group}"!') # Only checks for ipv4 and ipv6 neighbors # Check if neighbor address is assigned as system interface address vrf = None vrf_error_msg = f' in default VRF!' if 'vrf' in bgp: vrf = bgp['vrf'] vrf_error_msg = f' in VRF "{vrf}"!' if is_ip(peer) and is_addr_assigned(peer, vrf): raise ConfigError(f'Can not configure local address as neighbor "{peer}"{vrf_error_msg}') elif is_interface(peer): if 'peer_group' in peer_config: raise ConfigError(f'peer-group must be set under the interface node of "{peer}"') if 'remote_as' in peer_config: raise ConfigError(f'remote-as must be set under the interface node of "{peer}"') if 'source_interface' in peer_config['interface']: raise ConfigError(f'"source-interface" option not allowed for neighbor "{peer}"') # Local-AS allowed only for EBGP peers if 'local_as' in peer_config: remote_as = verify_remote_as(peer_config, bgp) if remote_as == bgp['system_as']: raise ConfigError(f'local-as configured for "{peer}", allowed only for eBGP peers!') for afi in ['ipv4_unicast', 'ipv4_multicast', 'ipv4_labeled_unicast', 'ipv4_flowspec', 'ipv6_unicast', 'ipv6_multicast', 'ipv6_labeled_unicast', 'ipv6_flowspec', 'l2vpn_evpn']: # Bail out early if address family is not configured if 'address_family' not in peer_config or afi not in peer_config['address_family']: continue # Check if neighbor has both ipv4 unicast and ipv4 labeled unicast configured at the same time. if 'ipv4_unicast' in peer_config['address_family'] and 'ipv4_labeled_unicast' in peer_config['address_family']: raise ConfigError(f'Neighbor "{peer}" cannot have both ipv4-unicast and ipv4-labeled-unicast configured at the same time!') # Check if neighbor has both ipv6 unicast and ipv6 labeled unicast configured at the same time. if 'ipv6_unicast' in peer_config['address_family'] and 'ipv6_labeled_unicast' in peer_config['address_family']: raise ConfigError(f'Neighbor "{peer}" cannot have both ipv6-unicast and ipv6-labeled-unicast configured at the same time!') afi_config = peer_config['address_family'][afi] if 'conditionally_advertise' in afi_config: if 'advertise_map' not in afi_config['conditionally_advertise']: raise ConfigError('Must speficy advertise-map when conditionally-advertise is in use!') # Verify advertise-map (which is a route-map) exists verify_route_map(afi_config['conditionally_advertise']['advertise_map'], bgp) if ('exist_map' not in afi_config['conditionally_advertise'] and 'non_exist_map' not in afi_config['conditionally_advertise']): raise ConfigError('Must either speficy exist-map or non-exist-map when ' \ 'conditionally-advertise is in use!') if {'exist_map', 'non_exist_map'} <= set(afi_config['conditionally_advertise']): raise ConfigError('Can not specify both exist-map and non-exist-map for ' \ 'conditionally-advertise!') if 'exist_map' in afi_config['conditionally_advertise']: verify_route_map(afi_config['conditionally_advertise']['exist_map'], bgp) if 'non_exist_map' in afi_config['conditionally_advertise']: verify_route_map(afi_config['conditionally_advertise']['non_exist_map'], bgp) # T4332: bgp deterministic-med cannot be disabled while addpath-tx-bestpath-per-AS is in use if 'addpath_tx_per_as' in afi_config: if dict_search('parameters.deterministic_med', bgp) == None: raise ConfigError('addpath-tx-per-as requires BGP deterministic-med paramtere to be set!') # Validate if configured Prefix list exists if 'prefix_list' in afi_config: for tmp in ['import', 'export']: if tmp not in afi_config['prefix_list']: # bail out early continue if afi == 'ipv4_unicast': verify_prefix_list(afi_config['prefix_list'][tmp], bgp) elif afi == 'ipv6_unicast': verify_prefix_list(afi_config['prefix_list'][tmp], bgp, version='6') if 'route_map' in afi_config: for tmp in ['import', 'export']: if tmp in afi_config['route_map']: verify_route_map(afi_config['route_map'][tmp], bgp) if 'route_reflector_client' in afi_config: if 'remote_as' in peer_config and peer_config['remote_as'] != 'internal' and peer_config['remote_as'] != bgp['system_as']: raise ConfigError('route-reflector-client only supported for iBGP peers') else: if 'peer_group' in peer_config: peer_group_as = dict_search(f'peer_group.{peer_group}.remote_as', bgp) if peer_group_as != None and peer_group_as != 'internal' and peer_group_as != bgp['system_as']: raise ConfigError('route-reflector-client only supported for iBGP peers') # Throw an error if a peer group is not configured for allow range for prefix in dict_search('listen.range', bgp) or []: # we can not use dict_search() here as prefix contains dots ... if 'peer_group' not in bgp['listen']['range'][prefix]: raise ConfigError(f'Listen range for prefix "{prefix}" has no peer group configured.') peer_group = bgp['listen']['range'][prefix]['peer_group'] if 'peer_group' not in bgp or peer_group not in bgp['peer_group']: raise ConfigError(f'Peer-group "{peer_group}" for listen range "{prefix}" does not exist!') if not verify_remote_as(bgp['listen']['range'][prefix], bgp): raise ConfigError(f'Peer-group "{peer_group}" requires remote-as to be set!') # Throw an error if the global administrative distance parameters aren't all filled out. if dict_search('parameters.distance.global', bgp) != None: for key in ['external', 'internal', 'local']: if dict_search(f'parameters.distance.global.{key}', bgp) == None: raise ConfigError('Missing mandatory configuration option for '\ f'global administrative distance {key}!') # TCP keepalive requires all three parameters to be set if dict_search('parameters.tcp_keepalive', bgp) != None: if not {'idle', 'interval', 'probes'} <= set(bgp['parameters']['tcp_keepalive']): raise ConfigError('TCP keepalive incomplete - idle, keepalive and probes must be set') # Address Family specific validation if 'address_family' in bgp: for afi, afi_config in bgp['address_family'].items(): if 'distance' in afi_config: # Throw an error if the address family specific administrative # distance parameters aren't all filled out. for key in ['external', 'internal', 'local']: if key not in afi_config['distance']: raise ConfigError('Missing mandatory configuration option for '\ f'{afi} administrative distance {key}!') if afi in ['ipv4_unicast', 'ipv6_unicast']: vrf_name = bgp['vrf'] if dict_search('vrf', bgp) else 'default' # Verify if currant VRF contains rd and route-target options # and does not exist in import list in other VRFs if dict_search(f'rd.vpn.export', afi_config): if verify_vrf_as_import(vrf_name, afi, bgp['dependent_vrfs']): raise ConfigError( 'Command "import vrf" conflicts with "rd vpn export" command!') if not dict_search('parameters.router_id', bgp): Warning(f'BGP "router-id" is required when using "rd" and "route-target"!') if dict_search('route_target.vpn.both', afi_config): if verify_vrf_as_import(vrf_name, afi, bgp['dependent_vrfs']): raise ConfigError( 'Command "import vrf" conflicts with "route-target vpn both" command!') if dict_search('route_target.vpn.import', afi_config): if verify_vrf_as_import(vrf_name, afi, bgp['dependent_vrfs']): raise ConfigError( 'Command "import vrf conflicts" with "route-target vpn import" command!') if dict_search('route_target.vpn.export', afi_config): if verify_vrf_as_import(vrf_name, afi, bgp['dependent_vrfs']): raise ConfigError( 'Command "import vrf" conflicts with "route-target vpn export" command!') # Verify if VRFs in import do not contain rd # and route-target options if dict_search('import.vrf', afi_config) is not None: # Verify if VRF with import does not contain rd # and route-target options if verify_vrf_import_options(afi_config): raise ConfigError( 'Please unconfigure "import vrf" commands before using vpn commands in the same VRF!') # Verify if VRFs in import list do not contain rd # and route-target options if verify_vrflist_import(afi, afi_config, bgp['dependent_vrfs']): raise ConfigError( 'Please unconfigure import vrf commands before using vpn commands in dependent VRFs!') # FRR error: please unconfigure vpn to vrf commands before # using import vrf commands if 'vpn' in afi_config['import'] or dict_search('export.vpn', afi_config) != None: raise ConfigError('Please unconfigure VPN to VRF commands before '\ 'using "import vrf" commands!') # Verify that the export/import route-maps do exist for export_import in ['export', 'import']: tmp = dict_search(f'route_map.vpn.{export_import}', afi_config) if tmp: verify_route_map(tmp, bgp) # Checks only required for L2VPN EVPN if afi in ['l2vpn_evpn']: if 'vni' in afi_config: for vni, vni_config in afi_config['vni'].items(): if 'rd' in vni_config and 'advertise_all_vni' not in afi_config: raise ConfigError('BGP EVPN "rd" requires "advertise-all-vni" to be set!') if 'route_target' in vni_config and 'advertise_all_vni' not in afi_config: raise ConfigError('BGP EVPN "route-target" requires "advertise-all-vni" to be set!') return None def generate(bgp): if not bgp or 'deleted' in bgp: return None bgp['frr_bgpd_config'] = render_to_string('frr/bgpd.frr.j2', bgp) return None def apply(bgp): bgp_daemon = 'bgpd' # Save original configuration prior to starting any commit actions frr_cfg = frr.FRRConfig() # Generate empty helper string which can be ammended to FRR commands, it # will be either empty (default VRF) or contain the "vrf