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authorChristian Trautman <ctrautma@redhat.com>2016-06-29 11:22:41 -0400
committerChristian Trautman <ctrautma@redhat.com>2016-07-07 11:18:13 -0400
commitfc09b7f0b6e036651fd4c101d9b8492c4cccfe0c (patch)
tree36a3192fdb99bd39a77d01dfd4387033ba6df494 /tools/namespace.py
parente04b1b9a22f93bb1783ff9e82486aec38dcb0efb (diff)
Namespace_veth: Add funtionality for network namespace, veth ports
Adds functionality for network namespaces and veth/peer ports to connect the namespaces. The namespaces are tracked outside of default Linux namespaces to prevent possible disruption of work outside of VSPerf where a user may create a namespace and the cleanup code deletes it. The cleanup code only removes namespaces and veth ports created inside the testcase. JIRA: VSPERF-310 Change-Id: If8881cafb119f38f052403a1de497e9660187d2e Signed-off-by: Christian Trautman <ctrautma@redhat.com>
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+# Copyright 2016 Red Hat Corporation.
+#
+# 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
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# 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.
+
+
+"""
+Network namespace emulation
+"""
+
+import logging
+import os
+
+from tools import tasks
+
+_LOGGER = logging.getLogger(__name__)
+
+
+def add_ip_to_namespace_eth(port, name, ip_addr, cidr):
+ """
+ Assign port ip address in namespace
+ :param port: port to assign ip to
+ :param name: namespace where port resides
+ :param ip_addr: ip address in dot notation format
+ :param cidr: cidr as string
+ :return:
+ """
+ ip_string = '{}/{}'.format(ip_addr, cidr)
+ tasks.run_task(['sudo', 'ip', 'netns', 'exec', name,
+ 'ip', 'addr', 'add', ip_string, 'dev', port],
+ _LOGGER, 'Assigning ip to port {}...'.format(port), False)
+
+
+def assign_port_to_namespace(port, name, port_up=False):
+ """
+ Assign NIC port to namespace
+ :param port: port name as string
+ :param name: namespace name as string
+ :param port_up: Boolean if the port should be brought up on assignment
+ :return: None
+ """
+ tasks.run_task(['sudo', 'ip', 'link', 'set',
+ 'netns', name, 'dev', port],
+ _LOGGER, 'Assigning port {} to namespace {}...'.format(
+ port, name), False)
+ if port_up:
+ tasks.run_task(['sudo', 'ip', 'netns', 'exec', name,
+ 'ip', 'link', 'set', port, 'up'],
+ _LOGGER, 'Bringing up port {}...'.format(port), False)
+
+
+def create_namespace(name):
+ """
+ Create a linux namespace. Raises RuntimeError if namespace already exists
+ in the system.
+ :param name: name of the namespace to be created as string
+ :return: None
+ """
+ if name in get_system_namespace_list():
+ raise RuntimeError('Namespace already exists in system')
+
+ # touch some files in a tmp area so we can track them separately from
+ # the OS's internal namespace tracking. This allows us to track VSPerf
+ # created namespaces so they can be cleaned up if needed.
+ if not os.path.isdir('/tmp/namespaces'):
+ try:
+ os.mkdir('/tmp/namespaces')
+ except os.error:
+ # OK don't crash, but cleanup may be an issue...
+ _LOGGER.error('Unable to create namespace temp folder.')
+ _LOGGER.error(
+ 'Namespaces will not be removed on test case completion')
+ if os.path.isdir('/tmp/namespaces'):
+ with open('/tmp/namespaces/{}'.format(name), 'a'):
+ os.utime('/tmp/namespaces/{}'.format(name), None)
+
+ tasks.run_task(['sudo', 'ip', 'netns', 'add', name], _LOGGER,
+ 'Creating namespace {}...'.format(name), False)
+ tasks.run_task(['sudo', 'ip', 'netns', 'exec', name,
+ 'ip', 'link', 'set', 'lo', 'up'], _LOGGER,
+ 'Enabling loopback interface...', False)
+
+
+def delete_namespace(name):
+ """
+ Delete linux network namespace
+ :param name: namespace to delete
+ :return: None
+ """
+ # delete the file if it exists in the temp area
+ if os.path.exists('/tmp/namespaces/{}'.format(name)):
+ os.remove('/tmp/namespaces/{}'.format(name))
+ tasks.run_task(['sudo', 'ip', 'netns', 'delete', name], _LOGGER,
+ 'Deleting namespace {}...'.format(name), False)
+
+
+def get_system_namespace_list():
+ """
+ Return tuple of strings for namespaces on the system
+ :return: tuple of namespaces as string
+ """
+ return tuple(os.listdir('/var/run/netns'))
+
+
+def get_vsperf_namespace_list():
+ """
+ Return a tuple of strings for namespaces created by vsperf testcase
+ :return: tuple of namespaces as string
+ """
+ if os.path.isdir('/tmp/namespaces'):
+ return tuple(os.listdir('/tmp/namespaces'))
+ else:
+ return []
+
+
+def reset_port_to_root(port, name):
+ """
+ Return the assigned port to the root namespace
+ :param port: port to return as string
+ :param name: namespace the port currently resides
+ :return: None
+ """
+ tasks.run_task(['sudo', 'ip', 'netns', 'exec', name,
+ 'ip', 'link', 'set', port, 'netns', '1'],
+ _LOGGER, 'Assigning port {} to namespace {}...'.format(
+ port, name), False)
+
+
+# pylint: disable=unused-argument
+# pylint: disable=invalid-name
+def validate_add_ip_to_namespace_eth(result, port, name, ip_addr, cidr):
+ """
+ Validation function for integration testcases
+ """
+ ip_string = '{}/{}'.format(ip_addr, cidr)
+ return ip_string in ''.join(tasks.run_task(
+ ['sudo', 'ip', 'netns', 'exec', name, 'ip', 'addr', 'show', port],
+ _LOGGER, 'Validating ip address in namespace...', False))
+
+
+def validate_assign_port_to_namespace(result, port, name, port_up=False):
+ """
+ Validation function for integration testcases
+ """
+ # this could be improved...its not 100% accurate
+ return port in ''.join(tasks.run_task(
+ ['sudo', 'ip', 'netns', 'exec', name, 'ip', 'addr'],
+ _LOGGER, 'Validating port in namespace...'))
+
+
+def validate_create_namespace(result, name):
+ """
+ Validation function for integration testcases
+ """
+ return name in get_system_namespace_list()
+
+
+def validate_delete_namespace(result, name):
+ """
+ Validation function for integration testcases
+ """
+ return name not in get_system_namespace_list()
+
+
+def validate_reset_port_to_root(result, port, name):
+ """
+ Validation function for integration testcases
+ """
+ return not validate_assign_port_to_namespace(result, port, name)