OpenStack Networking (Neutron)
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# Copyright (c) 2015 Red Hat, Inc.
# All Rights Reserved.
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import re
import signal
import time
from oslo_log import log as logging
from neutron.agent.common import async_process
from neutron.agent.linux import iptables_manager
from neutron.common import utils as common_utils
from neutron.tests.common import net_helpers
LOG = logging.getLogger(__name__)
class TcpdumpException(Exception):
def extract_mod_nw_tos_action(flows):
tos_mark = None
if flows:
flow_list = flows.splitlines()
for flow in flow_list:
if 'mod_nw_tos' in flow:
actions = flow.partition('actions=')[2]
after_mod = actions.partition('mod_nw_tos:')[2]
tos_mark = int(after_mod.partition(',')[0])
return tos_mark
def extract_dscp_value_from_iptables_rules(rules):
pattern = (r"^-A neutron-linuxbri-qos-.* -j DSCP "
"--set-dscp (?P<dscp_value>0x[A-Fa-f0-9]+)$")
for rule in rules:
m = re.match(pattern, rule)
if m:
return int("dscp_value"), 16)
def wait_until_bandwidth_limit_rule_applied(check_function, port_vif, rule):
def _bandwidth_limit_rule_applied():
bw_rule = check_function(port_vif)
expected = None, None
if rule:
expected = rule.max_kbps, rule.max_burst_kbps
return bw_rule == expected
def wait_until_egress_bandwidth_limit_rule_applied(bridge, port_vif, rule):
bridge.get_egress_bw_limit_for_port, port_vif, rule)
def wait_until_ingress_bandwidth_limit_rule_applied(bridge, port_vif, rule):
bridge.get_ingress_bw_limit_for_port, port_vif, rule)
def wait_until_dscp_marking_rule_applied_ovs(bridge, port_vif, rule):
def _dscp_marking_rule_applied():
port_num = bridge.get_port_ofport(port_vif)
flows = bridge.dump_flows_for(table='0', in_port=str(port_num))
dscp_mark = extract_mod_nw_tos_action(flows)
expected = None
if rule:
expected = rule << 2
return dscp_mark == expected
def wait_until_dscp_marking_rule_applied_linuxbridge(namespace, port_vif,
iptables = iptables_manager.IptablesManager(
def _dscp_marking_rule_applied():
mangle_rules = iptables.get_rules_for_table("mangle")
dscp_mark = extract_dscp_value_from_iptables_rules(mangle_rules)
return dscp_mark == expected_rule
def wait_for_dscp_marked_packet(sender_vm, receiver_vm, dscp_mark):
cmd = [
"tcpdump", "-i",, "-nlt",
"src", sender_vm.ip, 'and', 'dst', receiver_vm.ip]
if dscp_mark:
cmd += ["and", "(ip[1] & 0xfc == %s)" % (dscp_mark << 2)]
tcpdump_async = async_process.AsyncProcess(cmd, run_as_root=True,
with net_helpers.async_ping(sender_vm.namespace, [receiver_vm.ip]) as done:
while not done():
except async_process.AsyncProcessException:
# If it was already stopped than we don't care about it
tcpdump_stderr_lines = []
pattern = r"(?P<packets_count>^\d+) packets received by filter"
for line in tcpdump_async.iter_stderr():
m = re.match(pattern, line)
if m and int("packets_count")) != 0:
tcpdump_stdout_lines = [line for line in tcpdump_async.iter_stdout()]
LOG.debug("Captured output lines from tcpdump. Stdout: %s; Stderr: %s",
tcpdump_stdout_lines, tcpdump_stderr_lines)
raise TcpdumpException(
"No packets marked with DSCP = %(dscp_mark)s received from %(src)s "
"to %(dst)s" % {'dscp_mark': dscp_mark,
'src': sender_vm.ip,
'dst': receiver_vm.ip})