A common library that interfaces with VMware NSX.
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vmware-nsxlib/vmware_nsxlib/v3/native_dhcp.py

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3.5 KiB

# Copyright 2016 VMware, Inc.
# All Rights Reserved
#
# 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 vmware_nsxlib.v3 import constants
from vmware_nsxlib.v3 import utils
class NsxLibNativeDhcp(utils.NsxLibApiBase):
def build_static_routes(self, gateway_ip, cidr, host_routes):
# The following code is based on _generate_opts_per_subnet() in
# neutron/agent/linux/dhcp.py. It prepares DHCP options for a subnet.
# Add route for directly connected network.
static_routes = [{'network': cidr, 'next_hop': '0.0.0.0'}]
# Copy routes from subnet host_routes attribute.
for hr in host_routes:
if hr['destination'] == constants.IPv4_ANY:
if not gateway_ip:
gateway_ip = hr['nexthop']
else:
static_routes.append({'network': hr['destination'],
'next_hop': hr['nexthop']})
# If gateway_ip is defined, add default route via this gateway.
if gateway_ip:
static_routes.append({'network': constants.IPv4_ANY,
'next_hop': gateway_ip})
return static_routes, gateway_ip
def build_server_config(self, network, subnet, port, tags,
default_dns_nameservers=None,
default_dns_domain=None):
# Prepare the configuration for a new logical DHCP server.
server_ip = "%s/%u" % (port['fixed_ips'][0]['ip_address'],
netaddr.IPNetwork(subnet['cidr']).prefixlen)
dns_nameservers = subnet['dns_nameservers']
if not dns_nameservers or not utils.is_attr_set(dns_nameservers):
# use the default one , or the globally configured one
if default_dns_nameservers is not None:
dns_nameservers = default_dns_nameservers
else:
dns_nameservers = self.nsxlib_config.dns_nameservers
gateway_ip = subnet['gateway_ip']
if not utils.is_attr_set(gateway_ip):
gateway_ip = None
static_routes, gateway_ip = self.build_static_routes(
gateway_ip, subnet['cidr'], subnet['host_routes'])
options = {'option121': {'static_routes': static_routes}}
name = utils.get_name_and_uuid(network['name'] or 'dhcpserver',
network['id'])
dns_domain = network.get('dns_domain')
if dns_domain:
domain_name = dns_domain['dns_domain']
else:
# use the default one , or the globally configured one
if default_dns_domain is not None:
domain_name = default_dns_domain
else:
domain_name = self.nsxlib_config.dns_domain
return {'name': name,
'server_ip': server_ip,
'dns_nameservers': dns_nameservers,
'domain_name': domain_name,
'gateway_ip': gateway_ip,
'options': options,
'tags': tags}