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-rw-r--r--python/vyos/qos/base.py282
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diff --git a/python/vyos/qos/base.py b/python/vyos/qos/base.py
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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/>.
+
+import os
+
+from vyos.base import Warning
+from vyos.util import cmd
+from vyos.util import dict_search
+from vyos.util import read_file
+
+class QoSBase:
+ _debug = False
+ _direction = ['egress']
+ _parent = 0xffff
+
+ def __init__(self, interface):
+ if os.path.exists('/tmp/vyos.qos.debug'):
+ self._debug = True
+ self._interface = interface
+
+ def _cmd(self, command):
+ if self._debug:
+ print(f'DEBUG/QoS: {command}')
+ return cmd(command)
+
+ def get_direction(self) -> list:
+ return self._direction
+
+ def _get_class_max_id(self, config) -> int:
+ if 'class' in config:
+ tmp = list(config['class'].keys())
+ tmp.sort(key=lambda ii: int(ii))
+ return tmp[-1]
+ return None
+
+ def _build_base_qdisc(self, config : dict, cls_id : int):
+ """
+ Add/replace qdisc for every class (also default is a class). This is
+ a genetic method which need an implementation "per" queue-type.
+
+ This matches the old mapping as defined in Perl here:
+ https://github.com/vyos/vyatta-cfg-qos/blob/equuleus/lib/Vyatta/Qos/ShaperClass.pm#L223-L229
+ """
+ queue_type = dict_search('queue_type', config)
+ default_tc = f'tc qdisc replace dev {self._interface} parent {self._parent}:{cls_id:x}'
+
+ if queue_type == 'priority':
+ handle = 0x4000 + cls_id
+ default_tc += f' handle {handle:x}: prio'
+ self._cmd(default_tc)
+
+ queue_limit = dict_search('queue_limit', config)
+ for ii in range(1, 4):
+ tmp = f'tc qdisc replace dev {self._interface} parent {handle:x}:{ii:x} pfifo limit {queue_limit}'
+ self._cmd(tmp)
+
+ elif queue_type == 'fair-queue':
+ default_tc += f' sfq'
+
+ tmp = dict_search('queue_limit', config)
+ if tmp: default_tc += f' limit {tmp}'
+
+ self._cmd(default_tc)
+
+ elif queue_type == 'fq-codel':
+ default_tc += f' fq_codel'
+ tmp = dict_search('codel_quantum', config)
+ if tmp: default_tc += f' quantum {tmp}'
+
+ tmp = dict_search('flows', config)
+ if tmp: default_tc += f' flows {tmp}'
+
+ tmp = dict_search('interval', config)
+ if tmp: default_tc += f' interval {tmp}'
+
+ tmp = dict_search('interval', config)
+ if tmp: default_tc += f' interval {tmp}'
+
+ tmp = dict_search('queue_limit', config)
+ if tmp: default_tc += f' limit {tmp}'
+
+ tmp = dict_search('target', config)
+ if tmp: default_tc += f' target {tmp}'
+
+ default_tc += f' noecn'
+
+ self._cmd(default_tc)
+
+ elif queue_type == 'random-detect':
+ default_tc += f' red'
+
+ self._cmd(default_tc)
+
+ elif queue_type == 'drop-tail':
+ default_tc += f' pfifo'
+
+ tmp = dict_search('queue_limit', config)
+ if tmp: default_tc += f' limit {tmp}'
+
+ self._cmd(default_tc)
+
+ def _rate_convert(self, rate) -> int:
+ rates = {
+ 'bit' : 1,
+ 'kbit' : 1000,
+ 'mbit' : 1000000,
+ 'gbit' : 1000000000,
+ 'tbit' : 1000000000000,
+ }
+
+ if rate == 'auto' or rate.endswith('%'):
+ speed = read_file(f'/sys/class/net/{self._interface}/speed')
+ if not speed.isnumeric():
+ Warning('Interface speed cannot be determined (assuming 10 Mbit/s)')
+ speed = 10
+ if rate.endswith('%'):
+ percent = rate.rstrip('%')
+ speed = int(speed) * int(percent) // 100
+ return int(speed) *1000000 # convert to MBit/s
+
+ rate_numeric = int(''.join([n for n in rate if n.isdigit()]))
+ rate_scale = ''.join([n for n in rate if not n.isdigit()])
+
+ if int(rate_numeric) <= 0:
+ raise ValueError(f'{rate_numeric} is not a valid bandwidth <= 0')
+
+ if rate_scale:
+ return int(rate_numeric * rates[rate_scale])
+ else:
+ # No suffix implies Kbps just as Cisco IOS
+ return int(rate_numeric * 1000)
+
+ def update(self, config, direction, priority=None):
+ """ method must be called from derived class after it has completed qdisc setup """
+
+ if 'class' in config:
+ for cls, cls_config in config['class'].items():
+ self._build_base_qdisc(cls_config, int(cls))
+
+ if 'match' in cls_config:
+ for match, match_config in cls_config['match'].items():
+ for af in ['ip', 'ipv6']:
+ # every match criteria has it's tc instance
+ filter_cmd = f'tc filter replace dev {self._interface} parent {self._parent:x}:'
+
+ if priority:
+ filter_cmd += f' prio {cls}'
+ elif 'priority' in cls_config:
+ prio = cls_config['priority']
+ filter_cmd += f' prio {prio}'
+
+ filter_cmd += ' protocol all u32'
+
+ tc_af = af
+ if af == 'ipv6':
+ tc_af = 'ip6'
+
+ if af in match_config:
+ tmp = dict_search(f'{af}.source.address', match_config)
+ if tmp: filter_cmd += f' match {tc_af} src {tmp}'
+
+ tmp = dict_search(f'{af}.source.port', match_config)
+ if tmp: filter_cmd += f' match {tc_af} sport {tmp} 0xffff'
+
+ tmp = dict_search(f'{af}.destination.address', match_config)
+ if tmp: filter_cmd += f' match {tc_af} dst {tmp}'
+
+ tmp = dict_search(f'{af}.destination.port', match_config)
+ if tmp: filter_cmd += f' match {tc_af} dport {tmp} 0xffff'
+
+ tmp = dict_search(f'{af}.protocol', match_config)
+ if tmp: filter_cmd += f' match {tc_af} protocol {tmp} 0xff'
+
+ # Will match against total length of an IPv4 packet and
+ # payload length of an IPv6 packet.
+ #
+ # IPv4 : match u16 0x0000 ~MAXLEN at 2
+ # IPv6 : match u16 0x0000 ~MAXLEN at 4
+ tmp = dict_search(f'{af}.max_length', match_config)
+ if tmp:
+ # We need the 16 bit two's complement of the maximum
+ # packet length
+ tmp = hex(0xffff & ~int(tmp))
+
+ if af == 'ip':
+ filter_cmd += f' match u16 0x0000 {tmp} at 2'
+ elif af == 'ipv6':
+ filter_cmd += f' match u16 0x0000 {tmp} at 4'
+
+ # We match against specific TCP flags - we assume the IPv4
+ # header length is 20 bytes and assume the IPv6 packet is
+ # not using extension headers (hence a ip header length of 40 bytes)
+ # TCP Flags are set on byte 13 of the TCP header.
+ # IPv4 : match u8 X X at 33
+ # IPv6 : match u8 X X at 53
+ # with X = 0x02 for SYN and X = 0x10 for ACK
+ tmp = dict_search(f'{af}.tcp', match_config)
+ if tmp:
+ mask = 0
+ if 'ack' in tmp:
+ mask |= 0x10
+ if 'syn' in tmp:
+ mask |= 0x02
+ mask = hex(mask)
+
+ if af == 'ip':
+ filter_cmd += f' match u8 {mask} {mask} at 33'
+ elif af == 'ipv6':
+ filter_cmd += f' match u8 {mask} {mask} at 53'
+
+ # The police block allows limiting of the byte or packet rate of
+ # traffic matched by the filter it is attached to.
+ # https://man7.org/linux/man-pages/man8/tc-police.8.html
+ if any(tmp in ['exceed', 'bandwidth', 'burst'] for tmp in cls_config):
+ filter_cmd += f' action police'
+
+ if 'exceed' in cls_config:
+ action = cls_config['exceed']
+ filter_cmd += f' conform-exceed {action}'
+ if 'not_exceed' in cls_config:
+ action = cls_config['not_exceed']
+ filter_cmd += f'/{action}'
+
+ if 'bandwidth' in cls_config:
+ rate = self._rate_convert(cls_config['bandwidth'])
+ filter_cmd += f' rate {rate}'
+
+ if 'burst' in cls_config:
+ burst = cls_config['burst']
+ filter_cmd += f' burst {burst}'
+
+ cls = int(cls)
+ filter_cmd += f' flowid {self._parent:x}:{cls:x}'
+ self._cmd(filter_cmd)
+
+ if 'default' in config:
+ if 'class' in config:
+ class_id_max = self._get_class_max_id(config)
+ default_cls_id = int(class_id_max) +1
+ self._build_base_qdisc(config['default'], default_cls_id)
+
+ filter_cmd = f'tc filter replace dev {self._interface} parent {self._parent:x}: '
+ filter_cmd += 'prio 255 protocol all basic'
+
+ # The police block allows limiting of the byte or packet rate of
+ # traffic matched by the filter it is attached to.
+ # https://man7.org/linux/man-pages/man8/tc-police.8.html
+ if any(tmp in ['exceed', 'bandwidth', 'burst'] for tmp in config['default']):
+ filter_cmd += f' action police'
+
+ if 'exceed' in config['default']:
+ action = config['default']['exceed']
+ filter_cmd += f' conform-exceed {action}'
+ if 'not_exceed' in config['default']:
+ action = config['default']['not_exceed']
+ filter_cmd += f'/{action}'
+
+ if 'bandwidth' in config['default']:
+ rate = self._rate_convert(config['default']['bandwidth'])
+ filter_cmd += f' rate {rate}'
+
+ if 'burst' in config['default']:
+ burst = config['default']['burst']
+ filter_cmd += f' burst {burst}'
+
+ if 'class' in config:
+ filter_cmd += f' flowid {self._parent:x}:{default_cls_id:x}'
+
+ self._cmd(filter_cmd)
+
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