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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')) if os.path.exists(
'/var/run/netns') else tuple()
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=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)
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