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# Copyright (c) 2016 Cisco and/or its affiliates.
# 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.
"""Tap utilities library."""
from resources.libraries.python.VatExecutor import VatTerminal
from resources.libraries.python.InterfaceUtil import InterfaceUtil
class Tap(object):
"""Tap utilities."""
@staticmethod
def add_tap_interface(node, tap_name, mac=None):
"""Add tap interface with name and optionally with MAC.
:param node: Node to add tap on.
:param tap_name: Tap interface name for linux tap.
:param mac: Optional MAC address for VPP tap.
:type node: dict
:type tap_name: str
:type mac: str
:return: Returns a interface index.
:rtype: int
"""
command = 'connect'
if mac is not None:
args = 'tapname {} mac {}'.format(tap_name, mac)
else:
args = 'tapname {}'.format(tap_name)
with VatTerminal(node) as vat:
resp = vat.vat_terminal_exec_cmd_from_template('tap.vat',
tap_command=command,
tap_arguments=args)
return resp[0]['sw_if_index']
@staticmethod
def modify_tap_interface(node, if_index, tap_name, mac=None):
"""Modify tap interface like linux interface name or VPP MAC.
:param node: Node to modify tap on.
:param if_index: Index of tap interface to be modified.
:param tap_name: Tap interface name for linux tap.
:param mac: Optional MAC address for VPP tap.
:type node: dict
:type if_index: int
:type tap_name: str
:type mac: str
:return: Returns a interface index.
:rtype: int
"""
command = 'modify'
if mac is not None:
args = 'sw_if_index {} tapname {} mac {}'.format(
if_index, tap_name, mac)
else:
args = 'sw_if_index {} tapname {}'.format(if_index, tap_name)
with VatTerminal(node) as vat:
resp = vat.vat_terminal_exec_cmd_from_template('tap.vat',
tap_command=command,
tap_arguments=args)
return resp[0]['sw_if_index']
@staticmethod
def delete_tap_interface(node, if_index):
"""Delete tap interface.
:param node: Node to delete tap on.
:param if_index: Index of tap interface to be deleted.
:type node: dict
:type if_index: int
:raises RuntimeError: Deletion was not successful.
"""
command = 'delete'
args = 'sw_if_index {}'.format(if_index)
with VatTerminal(node) as vat:
resp = vat.vat_terminal_exec_cmd_from_template('tap.vat',
tap_command=command,
tap_arguments=args)
if int(resp[0]['retval']) != 0:
raise RuntimeError(
'Could not remove tap interface: {}'.format(resp))
@staticmethod
def check_tap_present(node, tap_name):
"""Check whether specific tap interface exists.
:param node: Node to check tap on.
:param tap_name: Tap interface name for linux tap.
:type node: dict
:type tap_name: str
:raises RuntimeError: Specified interface was not found.
"""
tap_if = InterfaceUtil.tap_dump(node, tap_name)
if len(tap_if) == 0:
raise RuntimeError(
'Tap interface :{} does not exist'.format(tap_name))
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