#!/usr/bin/env python3 # # Copyright (C) 2018-2021 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 . 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 get_interface_dict from vyos.configdict import node_changed from vyos.configdict import leaf_node_changed from vyos.configverify import verify_address from vyos.configverify import verify_bridge_delete from vyos.configverify import verify_interface_exists from vyos.configverify import verify_mtu_ipv6 from vyos.configverify import verify_vrf from vyos.ifconfig import Interface from vyos.ifconfig import GREIf from vyos.ifconfig import GRETapIf from vyos.ifconfig import IPIPIf from vyos.ifconfig import IP6GREIf from vyos.ifconfig import IPIP6If from vyos.ifconfig import IP6IP6If from vyos.ifconfig import SitIf from vyos.ifconfig import Sit6RDIf from vyos.template import is_ipv4 from vyos.template import is_ipv6 from vyos.util import get_json_iface_options from vyos.util import dict_search from vyos import ConfigError from vyos import airbag airbag.enable() def get_config(config=None): """ Retrive CLI config as dictionary. Dictionary can never be empty, as at least the interface name will be added or a deleted flag """ if config: conf = config else: conf = Config() base = ['interfaces', 'tunnel'] tunnel = get_interface_dict(conf, base) tmp = leaf_node_changed(conf, ['encapsulation']) if tmp: tunnel.update({'encapsulation_changed': {}}) # We must check if our interface is configured to be a DMVPN member nhrp_base = ['protocols', 'nhrp', 'tunnel'] conf.set_level(nhrp_base) nhrp = conf.get_config_dict([], key_mangling=('-', '_'), get_first_key=True) if nhrp: tunnel.update({'nhrp' : list(nhrp.keys())}) return tunnel def verify(tunnel): if 'deleted' in tunnel: verify_bridge_delete(tunnel) if 'nhrp' in tunnel and tunnel['ifname'] in tunnel['nhrp']: raise ConfigError('Tunnel used for NHRP, it can not be deleted!') return None if 'encapsulation' not in tunnel: raise ConfigError('Must configure the tunnel encapsulation for '\ '{ifname}!'.format(**tunnel)) verify_mtu_ipv6(tunnel) verify_address(tunnel) verify_vrf(tunnel) if 'local_ip' not in tunnel and 'dhcp_interface' not in tunnel: raise ConfigError('local-ip is mandatory for tunnel') if 'remote_ip' not in tunnel and tunnel['encapsulation'] != 'gre': raise ConfigError('remote-ip is mandatory for tunnel') if {'local_ip', 'dhcp_interface'} <= set(tunnel): raise ConfigError('Can not use both local-ip and dhcp-interface') if tunnel['encapsulation'] in ['ipip6', 'ip6ip6', 'ip6gre']: error_ipv6 = 'Encapsulation mode requires IPv6' if 'local_ip' in tunnel and not is_ipv6(tunnel['local_ip']): raise ConfigError(f'{error_ipv6} local-ip') if 'remote_ip' in tunnel and not is_ipv6(tunnel['remote_ip']): raise ConfigError(f'{error_ipv6} remote-ip') else: error_ipv4 = 'Encapsulation mode requires IPv4' if 'local_ip' in tunnel and not is_ipv4(tunnel['local_ip']): raise ConfigError(f'{error_ipv4} local-ip') if 'remote_ip' in tunnel and not is_ipv4(tunnel['remote_ip']): raise ConfigError(f'{error_ipv4} remote-ip') if tunnel['encapsulation'] in ['sit', 'gre-bridge']: if 'source_interface' in tunnel: raise ConfigError('Option source-interface can not be used with ' \ 'encapsulation "sit" or "gre-bridge"') elif tunnel['encapsulation'] == 'gre': if 'local_ip' in tunnel and is_ipv6(tunnel['local_ip']): raise ConfigError('Can not use local IPv6 address is for mGRE tunnels') if 'source_interface' in tunnel: verify_interface_exists(tunnel['source_interface']) def generate(tunnel): return None def apply(tunnel): interface = tunnel['ifname'] # If a gretap tunnel is already existing we can not "simply" change local or # remote addresses. This returns "Operation not supported" by the Kernel. # There is no other solution to destroy and recreate the tunnel. encap = '' tmp = get_json_iface_options(interface) if tmp: encap = dict_search('linkinfo.info_kind', tmp) if 'deleted' in tunnel or 'encapsulation_changed' in tunnel or encap == 'gretap': if interface in interfaces(): tmp = Interface(interface) tmp.remove() if 'deleted' in tunnel: return None dispatch = { 'gre': GREIf, 'gre-bridge': GRETapIf, 'ipip': IPIPIf, 'ipip6': IPIP6If, 'ip6ip6': IP6IP6If, 'ip6gre': IP6GREIf, 'sit': SitIf, } # We need to re-map the tunnel encapsulation proto to a valid interface class encap = tunnel['encapsulation'] klass = dispatch[encap] # This is a special type of interface which needs additional parameters # when created using iproute2. Instead of passing a ton of arguments, # use a dictionary provided by the interface class which holds all the # options necessary. conf = klass.get_config() # Copy/re-assign our dictionary values to values understood by the # derived _Tunnel classes mapping = { # this : get_config() 'local_ip' : 'local', 'remote_ip' : 'remote', 'source_interface' : 'dev', 'parameters.ip.ttl' : 'ttl', 'parameters.ip.tos' : 'tos', 'parameters.ip.key' : 'key', } # Add additional IPv6 options if tunnel is IPv6 aware if tunnel['encapsulation'] in ['ipip6', 'ip6ip6', 'ip6gre']: mappingv6 = { # this : get_config() 'parameters.ipv6.encaplimit' : 'encaplimit' } mapping.update(mappingv6) for our_key, their_key in mapping.items(): if dict_search(our_key, tunnel) and their_key in conf: conf[their_key] = dict_search(our_key, tunnel) tun = klass(interface, **conf) tun.change_options() tun.update(tunnel) return None if __name__ == '__main__': try: c = get_config() generate(c) verify(c) apply(c) except ConfigError as e: print(e) exit(1)