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# Copyright 2019 VyOS maintainers and contributors <maintainers@vyos.io>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library. If not, see <http://www.gnu.org/licenses/>.
import jmespath
from vyos.ifconfig.interface import Interface
from vyos.ifconfig.stp import STP
from vyos.validate import assert_boolean
from vyos.validate import assert_positive
from vyos.util import cmd
@Interface.register
class BridgeIf(Interface):
"""
A bridge is a way to connect two Ethernet segments together in a protocol
independent way. Packets are forwarded based on Ethernet address, rather
than IP address (like a router). Since forwarding is done at Layer 2, all
protocols can go transparently through a bridge.
The Linux bridge code implements a subset of the ANSI/IEEE 802.1d standard.
"""
default = {
'type': 'bridge',
}
definition = {
**Interface.definition,
**{
'section': 'bridge',
'prefixes': ['br', ],
'broadcast': True,
},
}
_sysfs_set = {**Interface._sysfs_set, **{
'ageing_time': {
'validate': assert_positive,
'convert': lambda t: int(t) * 100,
'location': '/sys/class/net/{ifname}/bridge/ageing_time',
},
'forward_delay': {
'validate': assert_positive,
'convert': lambda t: int(t) * 100,
'location': '/sys/class/net/{ifname}/bridge/forward_delay',
},
'hello_time': {
'validate': assert_positive,
'convert': lambda t: int(t) * 100,
'location': '/sys/class/net/{ifname}/bridge/hello_time',
},
'max_age': {
'validate': assert_positive,
'convert': lambda t: int(t) * 100,
'location': '/sys/class/net/{ifname}/bridge/max_age',
},
'priority': {
'validate': assert_positive,
'location': '/sys/class/net/{ifname}/bridge/priority',
},
'stp': {
'validate': assert_boolean,
'location': '/sys/class/net/{ifname}/bridge/stp_state',
},
'multicast_querier': {
'validate': assert_boolean,
'location': '/sys/class/net/{ifname}/bridge/multicast_querier',
},
}}
_command_set = {**Interface._command_set, **{
'add_port': {
'shellcmd': 'ip link set dev {value} master {ifname}',
},
'del_port': {
'shellcmd': 'ip link set dev {value} nomaster',
},
}}
def set_ageing_time(self, time):
"""
Set bridge interface MAC address aging time in seconds. Internal kernel
representation is in centiseconds. Kernel default is 300 seconds.
Example:
>>> from vyos.ifconfig import BridgeIf
>>> BridgeIf('br0').ageing_time(2)
"""
self.set_interface('ageing_time', time)
def set_forward_delay(self, time):
"""
Set bridge forwarding delay in seconds. Internal Kernel representation
is in centiseconds.
Example:
>>> from vyos.ifconfig import BridgeIf
>>> BridgeIf('br0').forward_delay(15)
"""
self.set_interface('forward_delay', time)
def set_hello_time(self, time):
"""
Set bridge hello time in seconds. Internal Kernel representation
is in centiseconds.
Example:
>>> from vyos.ifconfig import BridgeIf
>>> BridgeIf('br0').set_hello_time(2)
"""
self.set_interface('hello_time', time)
def set_max_age(self, time):
"""
Set bridge max message age in seconds. Internal Kernel representation
is in centiseconds.
Example:
>>> from vyos.ifconfig import Interface
>>> BridgeIf('br0').set_max_age(30)
"""
self.set_interface('max_age', time)
def set_priority(self, priority):
"""
Set bridge max aging time in seconds.
Example:
>>> from vyos.ifconfig import BridgeIf
>>> BridgeIf('br0').set_priority(8192)
"""
self.set_interface('priority', priority)
def set_stp(self, state):
"""
Set bridge STP (Spanning Tree) state. 0 -> STP disabled, 1 -> STP enabled
Example:
>>> from vyos.ifconfig import BridgeIf
>>> BridgeIf('br0').set_stp(1)
"""
self.set_interface('stp', state)
def set_multicast_querier(self, enable):
"""
Sets whether the bridge actively runs a multicast querier or not. When a
bridge receives a 'multicast host membership' query from another network
host, that host is tracked based on the time that the query was received
plus the multicast query interval time.
Use enable=1 to enable or enable=0 to disable
Example:
>>> from vyos.ifconfig import Interface
>>> BridgeIf('br0').set_multicast_querier(1)
"""
self.set_interface('multicast_querier', enable)
def add_port(self, interface):
"""
Add physical interface to bridge (member port)
Example:
>>> from vyos.ifconfig import Interface
>>> BridgeIf('br0').add_port('eth0')
>>> BridgeIf('br0').add_port('eth1')
"""
return self.set_interface('add_port', interface)
def del_port(self, interface):
"""
Remove member port from bridge instance.
Example:
>>> from vyos.ifconfig import Interface
>>> BridgeIf('br0').del_port('eth1')
"""
return self.set_interface('del_port', interface)
def update(self, config):
""" General helper function which works on a dictionary retrived by
get_config_dict(). It's main intention is to consolidate the scattered
interface setup code and provide a single point of entry when workin
on any interface. """
# now call the regular function from within our base class
super().update(config)
# Set ageing time
value = config.get('aging')
self.set_ageing_time(value)
# set bridge forward delay
value = config.get('forwarding_delay')
self.set_forward_delay(value)
# set hello time
value = config.get('hello_time')
self.set_hello_time(value)
# set max message age
value = config.get('max_age')
self.set_max_age(value)
# set bridge priority
value = config.get('priority')
self.set_priority(value)
# enable/disable spanning tree
value = '1' if 'stp' in config else '0'
self.set_stp(value)
# enable or disable IGMP querier
tmp = jmespath.search('igmp.querier', config)
value = '1' if (tmp != None) else '0'
self.set_multicast_querier(value)
# remove interface from bridge
tmp = jmespath.search('member.interface_remove', config)
if tmp:
for member in tmp:
self.del_port(member)
STPBridgeIf = STP.enable(BridgeIf)
tmp = jmespath.search('member.interface', config)
if tmp:
for interface, interface_config in tmp.items():
# if we've come here we already verified the interface doesn't
# have addresses configured so just flush any remaining ones
cmd(f'ip addr flush dev "{interface}"')
# enslave interface port to bridge
self.add_port(interface)
tmp = STPBridgeIf(interface)
# set bridge port path cost
value = interface_config.get('cost')
tmp.set_path_cost(value)
# set bridge port path priority
value = interface_config.get('priority')
tmp.set_path_priority(value)
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