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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.configdict import is_member
from vyos.configdict import is_source_interface
from vyos.configdict import has_vlan_subinterface_configured
from vyos.configdict import dict_merge
from vyos.configverify import verify_dhcpv6
from vyos.configverify import verify_mirror_redirect
from vyos.configverify import verify_vrf
from vyos.ifconfig import BridgeIf
from vyos.validate import has_address_configured
from vyos.xml import defaults
from vyos.util import cmd
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', 'bridge']
bridge = get_interface_dict(conf, base)
# determine which members have been removed
tmp = node_changed(conf, ['member', 'interface'], key_mangling=('-', '_'))
if tmp:
if 'member' in bridge:
bridge['member'].update({'interface_remove': tmp })
else:
bridge.update({'member': {'interface_remove': tmp }})
if dict_search('member.interface', bridge):
# XXX: T2665: 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():
bridge['member']['interface'][interface] = dict_merge(
default_member_values, bridge['member']['interface'][interface])
# Check if member interface is already member of another bridge
tmp = is_member(conf, interface, 'bridge')
if tmp and bridge['ifname'] not in tmp:
bridge['member']['interface'][interface].update({'is_bridge_member' : tmp})
# Check if member interface is already member of a bond
tmp = is_member(conf, interface, 'bonding')
if tmp: bridge['member']['interface'][interface].update({'is_bond_member' : tmp})
# Check if member interface is used as source-interface on another interface
tmp = is_source_interface(conf, interface)
if tmp: bridge['member']['interface'][interface].update({'is_source_interface' : tmp})
# Bridge members must not have an assigned address
tmp = has_address_configured(conf, interface)
if tmp: bridge['member']['interface'][interface].update({'has_address' : ''})
# VLAN-aware bridge members must not have VLAN interface configuration
tmp = has_vlan_subinterface_configured(conf,interface)
if 'enable_vlan' in bridge and tmp:
bridge['member']['interface'][interface].update({'has_vlan' : ''})
return bridge
def verify(bridge):
if 'deleted' in bridge:
return None
verify_dhcpv6(bridge)
verify_vrf(bridge)
verify_mirror_redirect(bridge)
ifname = bridge['ifname']
if dict_search('member.interface', bridge):
for interface, interface_config in bridge['member']['interface'].items():
error_msg = f'Can not add interface "{interface}" to bridge, '
if interface == 'lo':
raise ConfigError('Loopback interface "lo" can not be added to a bridge')
if 'is_bridge_member' in interface_config:
tmp = next(iter(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 = next(iter(interface_config['is_bond_member']))
raise ConfigError(error_msg + f'it is already a member of bond "{tmp}"!')
if 'is_source_interface' in interface_config:
tmp = interface_config['is_source_interface']
raise ConfigError(error_msg + f'it is the source-interface of "{tmp}"!')
if 'has_address' in interface_config:
raise ConfigError(error_msg + 'it has an address assigned!')
if 'enable_vlan' in bridge:
if 'has_vlan' in interface_config:
raise ConfigError(error_msg + 'it has an VLAN subinterface assigned!')
if 'wlan' in interface:
raise ConfigError(error_msg + 'VLAN aware cannot be set!')
else:
for option in ['allowed_vlan', 'native_vlan']:
if option in interface_config:
raise ConfigError('Can not use VLAN options on non VLAN aware bridge')
if 'enable_vlan' in bridge:
if dict_search('vif.1', bridge):
raise ConfigError(f'VLAN 1 sub interface cannot be set for VLAN aware bridge {ifname}, and VLAN 1 is always the parent interface')
else:
if dict_search('vif', bridge):
raise ConfigError(f'You must first activate "enable-vlan" of {ifname} bridge to use "vif"')
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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interfaces-bridge.py (6 KB)

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