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# Copyright (c) 2019 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 ipaddress import ip_address
from robot.api import logger
from resources.libraries.python.Constants import Constants
from resources.libraries.python.L2Util import L2Util
from resources.libraries.python.InterfaceUtil import InterfaceUtil
from resources.libraries.python.PapiExecutor import PapiSocketExecutor
from resources.libraries.python.topology import Topology
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 or unicode
:type mac: str
:returns: Returns a interface index.
:rtype: int
"""
if isinstance(tap_name, unicode):
tap_name = str(tap_name)
cmd = 'tap_create_v2'
args = dict(
id=Constants.BITWISE_NON_ZERO,
use_random_mac=0 if mac else 1,
mac_address=L2Util.mac_to_bin(mac) if mac else 6 * b'\x00',
host_namespace=64 * b'\x00',
host_mac_addr=6 * b'\x00',
host_if_name_set=1,
host_if_name=tap_name + (64 - len(tap_name)) * b'\x00',
host_bridge=64 * b'\x00',
host_ip4_addr=4 * b'\x00',
host_ip6_addr=16 * b'\x00',
host_ip4_gw=4 * b'\x00',
host_ip6_gw=16 * b'\x00'
)
err_msg = 'Failed to create tap interface {tap} on host {host}'.format(
tap=tap_name, host=node['host'])
with PapiSocketExecutor(node) as papi_exec:
sw_if_index = papi_exec.add(cmd, **args).get_sw_if_index(err_msg)
if_key = Topology.add_new_port(node, 'tap')
Topology.update_interface_sw_if_index(node, if_key, sw_if_index)
Topology.update_interface_name(node, if_key, tap_name)
if mac is None:
mac = Tap.vpp_get_tap_interface_mac(node, tap_name)
Topology.update_interface_mac_address(node, if_key, mac)
tap_dev_name = Tap.vpp_get_tap_dev_name(node, tap_name)
Topology.update_interface_tap_dev_name(node, if_key, tap_dev_name)
return sw_if_index
@staticmethod
def vpp_get_tap_dev_name(node, host_if_name):
"""Get VPP tap interface name from hardware interfaces dump.
:param node: DUT node.
:param host_if_name: Tap host interface name.
:type node: dict
:type host_if_name: str
:returns: VPP tap interface dev_name.
:rtype: str
"""
return Tap.tap_dump(node, host_if_name).get('dev_name')
@staticmethod
def vpp_get_tap_interface_mac(node, interface_name):
"""Get tap interface MAC address from interfaces dump.
:param node: DUT node.
:param interface_name: Tap interface name.
:type node: dict
:type interface_name: str
:returns: Tap interface MAC address.
:rtype: str
"""
return InterfaceUtil.vpp_get_interface_mac(node, interface_name)
@staticmethod
def tap_dump(node, name=None):
"""Get all TAP interface data from the given node, or data about
a specific TAP interface.
:param node: VPP node to get data from.
:param name: Optional name of a specific TAP interface.
:type node: dict
:type name: str
:returns: Dictionary of information about a specific TAP interface, or
a List of dictionaries containing all TAP data for the given node.
:rtype: dict or list
"""
def process_tap_dump(tap_dump):
"""Process tap dump.
:param tap_dump: Tap interface dump.
:type tap_dump: dict
:returns: Processed tap interface dump.
:rtype: dict
"""
tap_dump['dev_name'] = tap_dump['dev_name'].rstrip('\x00')
tap_dump['host_if_name'] = tap_dump['host_if_name'].rstrip('\x00')
tap_dump['host_namespace'] = \
tap_dump['host_namespace'].rstrip('\x00')
tap_dump['host_mac_addr'] = \
L2Util.bin_to_mac(tap_dump['host_mac_addr'])
tap_dump['host_ip4_addr'] = ip_address(tap_dump['host_ip4_addr'])
tap_dump['host_ip6_addr'] = ip_address(tap_dump['host_ip6_addr'])
return tap_dump
cmd = 'sw_interface_tap_v2_dump'
err_msg = 'Failed to get TAP dump on host {host}'.format(
host=node['host'])
with PapiSocketExecutor(node) as papi_exec:
details = papi_exec.add(cmd).get_details(err_msg)
data = list() if name is None else dict()
for dump in details:
if name is None:
data.append(process_tap_dump(dump))
elif dump.get('host_if_name').rstrip('\x00') == name:
data = process_tap_dump(dump)
break
logger.debug('TAP data:\n{tap_data}'.format(tap_data=data))
return data
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