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# Copyright 2022 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/>.
from vyos.qos.base import QoSBase
class CAKE(QoSBase):
"""
https://man7.org/linux/man-pages/man8/tc-cake.8.html
"""
_direction = ['egress']
flow_isolation_map = {
'blind': 'flowblind',
'src-host': 'srchost',
'dst-host': 'dsthost',
'dual-dst-host': 'dual-dsthost',
'dual-src-host': 'dual-srchost',
'triple-isolate': 'triple-isolate',
'flow': 'flows',
'host': 'hosts',
}
def update(self, config, direction):
tmp = f'tc qdisc add dev {self._interface} root handle 1: cake {direction}'
if 'bandwidth' in config:
bandwidth = self._rate_convert(config['bandwidth'])
tmp += f' bandwidth {bandwidth}'
if 'rtt' in config:
rtt = config['rtt']
tmp += f' rtt {rtt}ms'
if 'flow_isolation' in config:
isolation_value = self.flow_isolation_map.get(config['flow_isolation'])
if isolation_value is not None:
tmp += f' {isolation_value}'
else:
raise ValueError(
f'Invalid flow isolation parameter: {config["flow_isolation"]}'
)
tmp += ' nat' if 'flow_isolation_nat' in config else ' nonat'
self._cmd(tmp)
# call base class
super().update(config, direction)
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