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#!/usr/bin/env python3
#
# Copyright (C) 2018-2020 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 copy import deepcopy
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_vrf
from vyos.configverify import verify_address
from vyos.configverify import verify_mtu_ipv6
from vyos.ifconfig import Interface
from vyos.ifconfig import ERSpanIf
from vyos.ifconfig import ER6SpanIf
from vyos.template import is_ipv4
from vyos.template import is_ipv6
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', 'erspan']
erspan = get_interface_dict(conf, base)
tmp = leaf_node_changed(conf, ['encapsulation'])
if tmp:
erspan.update({'encapsulation_changed': {}})
return erspan
def verify(erspan):
if 'deleted' in erspan:
return None
if 'encapsulation' not in erspan:
raise ConfigError('Must configure the ERSPAN tunnel encapsulation for '\
'{ifname}!'.format(**erspan))
verify_mtu_ipv6(erspan)
verify_address(erspan)
verify_vrf(erspan)
if 'local_ip' not in erspan:
raise ConfigError('local-ip is mandatory for ERSPAN tunnel')
if 'remote_ip' not in erspan:
raise ConfigError('remote-ip is mandatory for ERSPAN tunnel')
if erspan['encapsulation'] in ['ip6erspan']:
error_ipv6 = 'Encapsulation mode requires IPv6'
if 'local_ip' in erspan and not is_ipv6(erspan['local_ip']):
raise ConfigError(f'{error_ipv6} local-ip')
if 'remote_ip' in erspan and not is_ipv6(erspan['remote_ip']):
raise ConfigError(f'{error_ipv6} remote-ip')
else:
error_ipv4 = 'Encapsulation mode requires IPv4'
if 'local_ip' in erspan and not is_ipv4(erspan['local_ip']):
raise ConfigError(f'{error_ipv4} local-ip')
if 'remote_ip' in erspan and not is_ipv4(erspan['remote_ip']):
raise ConfigError(f'{error_ipv4} remote-ip')
if 'parameters' not in erspan:
raise ConfigError('parameters is mandatory for ERSPAN tunnel')
key = dict_search('parameters.ip.key',erspan)
if key == None:
raise ConfigError('parameters.ip.key is mandatory for ERSPAN tunnel')
if erspan['encapsulation'] == 'erspan':
if 'local_ip' in erspan and is_ipv6(erspan['local_ip']):
raise ConfigError('Can not use local IPv6 address is for ERSPAN tunnels')
def generate(erspan):
return None
def apply(erspan):
if 'deleted' in erspan or 'encapsulation_changed' in erspan:
if erspan['ifname'] in interfaces():
tmp = Interface(erspan['ifname'])
tmp.remove()
if 'deleted' in erspan:
return None
dispatch = {
'erspan': ERSpanIf,
'ip6erspan': ER6SpanIf
}
# We need to re-map the tunnel encapsulation proto to a valid interface class
encap = erspan['encapsulation']
klass = dispatch[encap]
conf = deepcopy(erspan)
conf.update(klass.get_config())
del conf['ifname']
erspan_tunnel = klass(erspan['ifname'],**conf)
erspan_tunnel.change_options()
erspan_tunnel.update(erspan)
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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