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# Copyright 2016 Hewlett Packard Enterprise Development Company
#
# 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.
import netaddr
from tempest.lib import exceptions as lib_exc
def get_unused_ip_addresses(ports_client, subnets_client,
network_id, subnet_id, count):
"""Return a list with the specified number of unused IP addresses
This method uses the given ports_client to find the specified number of
unused IP addresses on the given subnet using the supplied subnets_client
"""
ports = ports_client.list_ports(network_id=network_id)['ports']
subnet = subnets_client.show_subnet(subnet_id)
ip_net = netaddr.IPNetwork(subnet['subnet']['cidr'])
subnet_set = netaddr.IPSet(ip_net.iter_hosts())
alloc_set = netaddr.IPSet()
# prune out any addresses already allocated to existing ports
for port in ports:
for fixed_ip in port.get('fixed_ips'):
alloc_set.add(fixed_ip['ip_address'])
# exclude gateway_ip of subnet
gateway_ip = subnet['subnet']['gateway_ip']
if gateway_ip:
alloc_set.add(gateway_ip)
av_set = subnet_set - alloc_set
addrs = []
for cidr in reversed(av_set.iter_cidrs()):
for ip in reversed(cidr):
addrs.append(str(ip))
if len(addrs) == count:
return addrs
msg = "Insufficient IP addresses available"
raise lib_exc.BadRequest(message=msg)
def get_ping_payload_size(mtu, ip_version):
"""Return the maximum size of ping payload that will fit into MTU."""
if not mtu:
return None
if ip_version == 4:
ip_header = 20
icmp_header = 8
else:
ip_header = 40
icmp_header = 4
res = mtu - ip_header - icmp_header
if res < 0:
raise lib_exc.BadRequest(
message='MTU = %(mtu)d is too low for IPv%(ip_version)d' % {
'mtu': mtu,
'ip_version': ip_version,
})
return res
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