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|
#!/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 <http://www.gnu.org/licenses/>.
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.configverify import verify_tunnel
from vyos.ifconfig import Interface
from vyos.ifconfig import TunnelIf
from vyos.template import is_ipv4
from vyos.template import is_ipv6
from vyos.util import cmd
from vyos.util import dict_search
from vyos import ConfigError
from vyos import airbag
airbag.enable()
def get_tunnel_encapsulation(interface):
""" Returns the used encapsulation protocol for given interface.
If interface does not exist, None is returned.
"""
if not os.path.exists(f'/sys/class/net/{interface}'):
return None
from json import loads
tmp = loads(cmd(f'ip -d -j link show {interface}'))[0]
return tmp['linkinfo']['info_kind']
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:
error = 'Must configure encapsulation for "{ifname}"!'
raise ConfigError(error.format(**tunnel))
verify_mtu_ipv6(tunnel)
verify_address(tunnel)
verify_vrf(tunnel)
verify_tunnel(tunnel)
if 'source_interface' in tunnel:
verify_interface_exists(tunnel['source_interface'])
# TTL != 0 and nopmtudisc are incompatible, parameters and ip use default
# values, thus the keys are always present.
if dict_search('parameters.ip.no_pmtu_discovery', tunnel) != None:
if dict_search('parameters.ip.ttl', tunnel) != '0':
raise ConfigError('Disabled PMTU requires TTL set to "0"!')
if tunnel['encapsulation'] in ['ipip6', 'ip6ip6', 'ip6gre']:
raise ConfigError('Can not disable PMTU discovery for given encapsulation')
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 = get_tunnel_encapsulation(interface)
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
tun = TunnelIf(**tunnel)
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)
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