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interfaces-bridge.py
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interfaces-bridge.py
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#!/usr/bin/env python3
#
# Copyright (C) 2019-2020 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 netifaces import interfaces
from vyos.config import Config
from vyos.configdict import get_interface_dict
from vyos.configdict import node_changed
from vyos.configverify import verify_dhcpv6
from vyos.configverify import verify_vrf
from vyos.ifconfig import BridgeIf
from vyos.validate import is_member, has_address_configured
from vyos.xml import defaults
from vyos.util import cmd
from vyos import ConfigError
from vyos import airbag
airbag.enable()
def get_config():
"""
Retrive CLI config as dictionary. Dictionary can never be empty, as at least the
interface name will be added or a deleted flag
"""
conf = Config()
base = ['interfaces', 'bridge']
# determine tagNode instance
if 'VYOS_TAGNODE_VALUE' not in os.environ:
raise ConfigError('Interface (VYOS_TAGNODE_VALUE) not specified')
ifname = os.environ['VYOS_TAGNODE_VALUE']
bridge = get_interface_dict(conf, base, ifname)
# determine which members have been removed
tmp = node_changed(conf, ['member', 'interface'])
if tmp:
if 'member' in bridge:
bridge['member'].update({'interface_remove': tmp })
else:
bridge.update({'member': {'interface_remove': tmp }})
if 'member' in bridge and 'interface' in bridge['member']:
# XXX TT2665 we need a copy of the dict keys for iteration, else we will get:
# RuntimeError: dictionary changed size during iteration
for interface in list(bridge['member']['interface']):
for key in ['cost', 'priority']:
if interface == key:
del bridge['member']['interface'][key]
continue
# the default dictionary is not properly paged into the dict (see T2665)
# thus we will ammend it ourself
default_member_values = defaults(base + ['member', 'interface'])
for interface, interface_config in bridge['member']['interface'].items():
interface_config.update(default_member_values)
# Check if we are a member of another bridge device
tmp = is_member(conf, interface, 'bridge')
if tmp and tmp != ifname:
interface_config.update({'is_bridge_member' : tmp})
# Check if we are a member of a bond device
tmp = is_member(conf, interface, 'bonding')
if tmp:
interface_config.update({'is_bond_member' : tmp})
# Bridge members must not have an assigned address
tmp = has_address_configured(conf, interface)
if tmp:
interface_config.update({'has_address' : ''})
return bridge
def verify(bridge):
if 'deleted' in bridge:
return None
verify_dhcpv6(bridge)
verify_vrf(bridge)
if 'member' in bridge:
member = bridge.get('member')
bridge_name = bridge['ifname']
for interface, interface_config in member.get('interface', {}).items():
error_msg = f'Can not add interface "{interface}" to bridge "{bridge_name}", '
if interface == 'lo':
raise ConfigError('Loopback interface "lo" can not be added to a bridge')
if interface not in interfaces():
raise ConfigError(error_msg + 'it does not exist!')
if 'is_bridge_member' in interface_config:
tmp = interface_config['is_bridge_member']
raise ConfigError(error_msg + f'it is already a member of bridge "{tmp}"!')
if 'is_bond_member' in interface_config:
tmp = interface_config['is_bond_member']
raise ConfigError(error_msg + f'it is already a member of bond "{tmp}"!')
if 'has_address' in interface_config:
raise ConfigError(error_msg + 'it has an address assigned!')
return None
def generate(bridge):
return None
def apply(bridge):
br = BridgeIf(bridge['ifname'])
if 'deleted' in bridge:
# delete interface
br.remove()
else:
br.update(bridge)
return None
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)

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