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# Copyright (c) 2019 Intel 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.
"""Loadbalancer util library."""
from socket import htonl
from ipaddress import ip_address
from resources.libraries.python.topology import NodeType, Topology
from resources.libraries.python.PapiExecutor import PapiSocketExecutor
class LoadBalancerUtil(object):
"""Basic Loadbalancer parameter configuration."""
@staticmethod
def vpp_lb_conf(node, **kwargs):
"""Config global parameters for loadbalancer.
:param node: Node where the interface is.
:param kwargs: Optional key-value arguments:
ip4_src_addr: IPv4 address to be used as source for IPv4 traffic.
(str)
ip6_src_addr: IPv6 address to be used as source for IPv6 traffic.
(str)
flow_timeout: Time in seconds after which, if no packet is received
for a given flow, the flow is removed from the
established flow table. (int)
buckets_per_core: Number of buckets *per worker thread* in the
established flow table (int)
:type node: dict
:type kwargs: dict
:returns: Nothing.
:raises ValueError: If the node has an unknown node type.
"""
if node['type'] == NodeType.DUT:
ip4_src_addr = ip_address(unicode(kwargs.pop('ip4_src_addr',
'255.255.255.255')))
ip6_src_addr = ip_address(unicode(kwargs.pop('ip6_src_addr',\
'ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff')))
flow_timeout = kwargs.pop('flow_timeout', 40)
sticky_buckets_per_core = kwargs.pop('buckets_per_core', 1024)
cmd = 'lb_conf'
err_msg = 'Failed to set lb conf on host {host}'.format(
host=node['host'])
args = dict(ip4_src_address=str(ip4_src_addr),
ip6_src_address=str(ip6_src_addr),
sticky_buckets_per_core=sticky_buckets_per_core,
flow_timeout=flow_timeout)
with PapiSocketExecutor(node) as papi_exec:
papi_exec.add(cmd, **args).get_reply(err_msg)
else:
raise ValueError('Node {host} has unknown NodeType: "{type}"'
.format(host=node['host'], type=node['type']))
@staticmethod
def vpp_lb_add_del_vip(node, **kwargs):
"""Config vip for loadbalancer.
:param node: Node where the interface is.
:param kwargs: Optional key-value arguments:
vip_addr: IPv4 address to be used as source for IPv4 traffic. (str)
protocol: tcp or udp. (int)
port: destination port. (int)
encap: encap is ip4 GRE(0) or ip6 (1GRE) or L3DSR(2) or NAT4(3) or
NAT6(4). (int)
dscp: dscp bit corresponding to VIP
type: service type
target_port: Pod's port corresponding to specific service
node_port: Node's port
new_len: Size of the new connections flow table used
for this VIP
is_del: 1 if the VIP should be removed otherwise 0.
:type node: dict
:type kwargs: dict
:returns: Nothing.
:raises ValueError: If the node has an unknown node type.
"""
if node['type'] == NodeType.DUT:
vip_addr = kwargs.pop('vip_addr', '0.0.0.0')
protocol = kwargs.pop('protocol', 255)
port = kwargs.pop('port', 0)
encap = kwargs.pop('encap', 0)
dscp = kwargs.pop('dscp', 0)
srv_type = kwargs.pop('srv_type', 0)
target_port = kwargs.pop('target_port', 0)
node_port = kwargs.pop('node_port', 0)
new_len = kwargs.pop('new_len', 1024)
is_del = kwargs.pop('is_del', 0)
cmd = 'lb_add_del_vip'
err_msg = 'Failed to add vip on host {host}'.format(
host=node['host'])
vip_addr = ip_address(unicode(vip_addr)).packed
args = dict(pfx={'len': 128,
'address': {'un': {'ip4': vip_addr}, 'af': 0}},
protocol=protocol,
port=port,
encap=htonl(encap),
dscp=dscp,
type=srv_type,
target_port=target_port,
node_port=node_port,
new_flows_table_length=int(new_len),
is_del=is_del)
with PapiSocketExecutor(node) as papi_exec:
papi_exec.add(cmd, **args).get_reply(err_msg)
else:
raise ValueError('Node {host} has unknown NodeType: "{type}"'
.format(host=node['host'], type=node['type']))
@staticmethod
def vpp_lb_add_del_as(node, **kwargs):
"""Config AS for Loadbalancer.
:param node: Node where the interface is.
:param kwargs: Optional key-value arguments:
vip_addr: IPv4 address to be used as source for IPv4 traffic. (str)
protocol: tcp or udp. (int)
port: destination port. (int)
as_addr: The application server address. (str)
is_del: 1 if the VIP should be removed otherwise 0. (int)
is_flush: 1 if the sessions related to this AS should be flushed
otherwise 0. (int)
:type node: dict
:type kwargs: dict
:returns: Nothing.
:raises ValueError: If the node has an unknown node type.
"""
if node['type'] == NodeType.DUT:
cmd = 'lb_add_del_as'
err_msg = 'Failed to add lb as on host {host}'.format(
host=node['host'])
vip_addr = kwargs.pop('vip_addr', '0.0.0.0')
protocol = kwargs.pop('protocol', 255)
port = kwargs.pop('port', 0)
as_addr = kwargs.pop('as_addr', '0.0.0.0')
is_del = kwargs.pop('is_del', 0)
is_flush = kwargs.pop('is_flush', 0)
vip_addr = ip_address(unicode(vip_addr)).packed
as_addr = ip_address(unicode(as_addr)).packed
args = dict(pfx={'len': 128,
'address': {'un': {'ip4': vip_addr}, 'af': 0}},
protocol=protocol,
port=port,
as_address={'un': {'ip4': as_addr}, 'af': 0},
is_del=is_del,
is_flush=is_flush)
with PapiSocketExecutor(node) as papi_exec:
papi_exec.add(cmd, **args).get_reply(err_msg)
else:
raise ValueError('Node {host} has unknown NodeType: "{type}"'
.format(host=node['host'], type=node['type']))
@staticmethod
def vpp_lb_add_del_intf_nat4(node, **kwargs):
"""Enable/disable NAT4 feature on the interface.
:param node: Node where the interface is.
:param kwargs: Optional key-value arguments:
is_add: true if add, false if delete. (bool)
interface: software index of the interface. (int)
:type node: dict
:type kwargs: dict
:returns: Nothing.
:raises ValueError: If the node has an unknown node type.
"""
if node['type'] == NodeType.DUT:
cmd = 'lb_add_del_intf_nat4'
err_msg = 'Failed to add interface nat4 on host {host}'.format(
host=node['host'])
is_add = kwargs.pop('is_add', True)
interface = kwargs.pop('interface', 0)
sw_if_index = Topology.get_interface_sw_index(node, interface)
args = dict(is_add=is_add, sw_if_index=sw_if_index)
with PapiSocketExecutor(node) as papi_exec:
papi_exec.add(cmd, **args).get_reply(err_msg)
else:
raise ValueError('Node {host} has unknown NodeType: "{type}"'
.format(host=node['host'], type=node['type']))
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