53 lines
2.2 KiB
Python
53 lines
2.2 KiB
Python
# Copyright 2014 Hewlett-Packard Development Company, L.P.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import netaddr
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from neutron.agent.l3.item_allocator import ItemAllocator
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class LinkLocalAddressPair(netaddr.IPNetwork):
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def __init__(self, addr):
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super(LinkLocalAddressPair, self).__init__(addr)
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def get_pair(self):
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"""Builds an address pair from the first and last addresses. """
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# TODO(kevinbenton): the callers of this seem only interested in an IP,
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# so we should just return two IPAddresses.
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return (netaddr.IPNetwork("%s/%s" % (self.network, self.prefixlen)),
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netaddr.IPNetwork("%s/%s" % (self[-1], self.prefixlen)))
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class LinkLocalAllocator(ItemAllocator):
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"""Manages allocation of link local IP addresses.
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These link local addresses are used for routing inside the fip namespaces.
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The associations need to persist across agent restarts to maintain
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consistency. Without this, there is disruption in network connectivity
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as the agent rewires the connections with the new IP address associations.
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Persisting these in the database is unnecessary and would degrade
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performance.
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"""
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def __init__(self, data_store_path, subnet):
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"""Create the necessary pool and item allocator
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using ',' as the delimiter and LinkLocalAllocator as the
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class type
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"""
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subnet = netaddr.IPNetwork(subnet)
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pool = set(LinkLocalAddressPair(s) for s in subnet.subnet(31))
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super(LinkLocalAllocator, self).__init__(data_store_path,
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LinkLocalAddressPair,
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pool)
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