diff options
Diffstat (limited to 'src/conf_mode/interfaces-tunnel.py')
| -rwxr-xr-x | src/conf_mode/interfaces-tunnel.py | 82 |
1 files changed, 48 insertions, 34 deletions
diff --git a/src/conf_mode/interfaces-tunnel.py b/src/conf_mode/interfaces-tunnel.py index ada39a249..c4023586a 100755 --- a/src/conf_mode/interfaces-tunnel.py +++ b/src/conf_mode/interfaces-tunnel.py @@ -18,7 +18,6 @@ import os from sys import exit from netifaces import interfaces -from ipaddress import IPv4Address from vyos.config import Config from vyos.configdict import get_interface_dict @@ -50,8 +49,24 @@ def get_config(config=None): base = ['interfaces', 'tunnel'] tunnel = get_interface_dict(conf, base) - tmp = leaf_node_changed(conf, ['encapsulation']) - if tmp: tunnel.update({'encapsulation_changed': {}}) + if 'deleted' not in tunnel: + tmp = leaf_node_changed(conf, ['encapsulation']) + if tmp: tunnel.update({'encapsulation_changed': {}}) + + # We also need to inspect other configured tunnels as there are Kernel + # restrictions where we need to comply. E.g. GRE tunnel key can't be used + # twice, or with multiple GRE tunnels to the same location we must specify + # a GRE key + conf.set_level(base) + tunnel['other_tunnels'] = conf.get_config_dict([], key_mangling=('-', '_'), + get_first_key=True, + no_tag_node_value_mangle=True) + # delete our own instance from this dict + ifname = tunnel['ifname'] + del tunnel['other_tunnels'][ifname] + # if only one tunnel is present on the system, no need to keep this key + if len(tunnel['other_tunnels']) == 0: + del tunnel['other_tunnels'] # We must check if our interface is configured to be a DMVPN member nhrp_base = ['protocols', 'nhrp', 'tunnel'] @@ -72,48 +87,47 @@ def verify(tunnel): verify_tunnel(tunnel) - # If tunnel source address any and key not set + # If tunnel source is any and gre key is not set + interface = tunnel['ifname'] if tunnel['encapsulation'] in ['gre'] and \ dict_search('source_address', tunnel) == '0.0.0.0' and \ dict_search('parameters.ip.key', tunnel) == None: - raise ConfigError('Tunnel parameters ip key must be set!') + raise ConfigError(f'"parameters ip key" must be set for {interface} when '\ + 'encapsulation is GRE!') - if tunnel['encapsulation'] in ['gre', 'gretap']: + gre_encapsulations = ['gre', 'gretap'] + if tunnel['encapsulation'] in gre_encapsulations and 'other_tunnels' in tunnel: # Check pairs tunnel source-address/encapsulation/key with exists tunnels. # Prevent the same key for 2 tunnels with same source-address/encap. T2920 - for tunnel_if in Section.interfaces('tunnel'): - # It makes no sense to run the test against our own interface we - # are currently configuring - if tunnel['ifname'] == tunnel_if: - continue - - tunnel_cfg = get_interface_config(tunnel_if) + for o_tunnel, o_tunnel_conf in tunnel['other_tunnels'].items(): # no match on encapsulation - bail out - if dict_search('linkinfo.info_kind', tunnel_cfg) != tunnel['encapsulation']: + our_encapsulation = tunnel['encapsulation'] + their_encapsulation = o_tunnel_conf['encapsulation'] + if our_encapsulation in gre_encapsulations and their_encapsulation \ + not in gre_encapsulations: continue - new_source_address = dict_search('source_address', tunnel) - new_source_interface = dict_search('source_interface', tunnel) - if dict_search('parameters.ip.key', tunnel) != None: - # Convert tunnel key to ip key, format "ip -j link show" - # 1 => 0.0.0.1, 999 => 0.0.3.231 - orig_new_key = dict_search('parameters.ip.key', tunnel) - new_key = IPv4Address(int(orig_new_key)) - new_key = str(new_key) - if dict_search('address', tunnel_cfg) == new_source_address and \ - dict_search('linkinfo.info_data.ikey', tunnel_cfg) == new_key: - raise ConfigError(f'Key "{orig_new_key}" for source-address "{new_source_address}" ' \ + our_address = dict_search('source_address', tunnel) + our_key = dict_search('parameters.ip.key', tunnel) + their_address = dict_search('source_address', o_tunnel_conf) + their_key = dict_search('parameters.ip.key', o_tunnel_conf) + if our_key != None: + if their_address == our_address and their_key == our_key: + raise ConfigError(f'Key "{our_key}" for source-address "{our_address}" ' \ f'is already used for tunnel "{tunnel_if}"!') else: - # If no IP GRE key is used we can not have more then one GRE tunnel - # bound to any one interface/IP address. This will result in a OS - # PermissionError: add tunnel "gre0" failed: File exists - if (dict_search('address', tunnel_cfg) == new_source_address or - (dict_search('address', tunnel_cfg) == '0.0.0.0' and - dict_search('link', tunnel_cfg) == new_source_interface)): - raise ConfigError(f'Missing required "ip key" parameter when \ - running more then one GRE based tunnel on the \ - same source-interface/source-address') + our_source_if = dict_search('source_interface', tunnel) + their_source_if = dict_search('source_interface', o_tunnel_conf) + our_remote = dict_search('remote', tunnel) + their_remote = dict_search('remote', o_tunnel_conf) + # If no IP GRE key is defined we can not have more then one GRE tunnel + # bound to any one interface/IP address and the same remote. This will + # result in a OS PermissionError: add tunnel "gre0" failed: File exists + if (their_address == our_address or our_source_if == their_source_if) and \ + our_remote == their_remote: + raise ConfigError(f'Missing required "ip key" parameter when '\ + 'running more then one GRE based tunnel on the '\ + 'same source-interface/source-address') # Keys are not allowed with ipip and sit tunnels if tunnel['encapsulation'] in ['ipip', 'sit']: |