94 lines
3.2 KiB
Python
94 lines
3.2 KiB
Python
# Copyright (c) 2015 Red Hat, Inc.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import re
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from neutron.agent.linux import async_process
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from neutron.common import utils as common_utils
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IPv4_ADDR_REGEX = r"(\d{1,3}\.){3}\d{1,3}"
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class TcpdumpException(Exception):
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pass
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def extract_mod_nw_tos_action(flows):
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tos_mark = None
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if flows:
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flow_list = flows.splitlines()
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for flow in flow_list:
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if 'mod_nw_tos' in flow:
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actions = flow.partition('actions=')[2]
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after_mod = actions.partition('mod_nw_tos:')[2]
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tos_mark = int(after_mod.partition(',')[0])
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return tos_mark
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def wait_until_bandwidth_limit_rule_applied(bridge, port_vif, rule):
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def _bandwidth_limit_rule_applied():
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bw_rule = bridge.get_egress_bw_limit_for_port(port_vif)
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expected = None, None
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if rule:
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expected = rule.max_kbps, rule.max_burst_kbps
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return bw_rule == expected
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common_utils.wait_until_true(_bandwidth_limit_rule_applied)
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def wait_until_dscp_marking_rule_applied(bridge, port_vif, rule):
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def _dscp_marking_rule_applied():
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port_num = bridge.get_port_ofport(port_vif)
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flows = bridge.dump_flows_for(table='0', in_port=str(port_num))
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dscp_mark = extract_mod_nw_tos_action(flows)
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expected = None
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if rule:
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expected = rule << 2
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return dscp_mark == expected
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common_utils.wait_until_true(_dscp_marking_rule_applied)
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def wait_for_dscp_marked_packet(sender_vm, receiver_vm, dscp_mark):
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cmd = ["tcpdump", "-i", receiver_vm.port.name, "-nlt"]
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if dscp_mark:
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cmd += ["(ip[1] & 0xfc == %s)" % (dscp_mark << 2)]
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tcpdump_async = async_process.AsyncProcess(cmd, run_as_root=True,
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namespace=receiver_vm.namespace)
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tcpdump_async.start()
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sender_vm.block_until_ping(receiver_vm.ip)
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try:
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tcpdump_async.stop()
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except async_process.AsyncProcessException:
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# If it was already stopped than we don't care about it
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pass
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pattern = (r"IP (?P<src_ip>%(ip_addr_regex)s) > "
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"(?P<dst_ip>%(ip_addr_regex)s): ICMP .*$" % {
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'ip_addr_regex': IPv4_ADDR_REGEX})
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for line in tcpdump_async.iter_stdout():
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m = re.match(pattern, line)
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if m and (m.group("src_ip") == sender_vm.ip and
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m.group("dst_ip") == receiver_vm.ip):
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return
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raise TcpdumpException(
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"No packets marked with DSCP = %(dscp_mark)s received from %(src)s "
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"to %(dst)s" % {'dscp_mark': dscp_mark,
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'src': sender_vm.ip,
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'dst': receiver_vm.ip})
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