56 lines
1.9 KiB
Python
56 lines
1.9 KiB
Python
# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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# Copyright 2011 Justin Santa Barbara
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# All Rights Reserved.
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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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"""IPv6 address generation with account identifier embedded."""
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import hashlib
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import netaddr
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import six
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from nova.i18n import _
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def to_global(prefix, mac, project_id):
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addr = project_id
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if isinstance(addr, six.text_type):
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addr = addr.encode('utf-8')
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addr = hashlib.sha1(addr)
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addr = int(addr.hexdigest()[:8], 16) << 32
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project_hash = netaddr.IPAddress(addr)
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static_num = netaddr.IPAddress(0xff << 24)
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try:
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mac_suffix = netaddr.EUI(mac).value & 0xffffff
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mac_addr = netaddr.IPAddress(mac_suffix)
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except netaddr.AddrFormatError:
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raise TypeError(_('Bad mac for to_global_ipv6: %s') % mac)
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try:
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maskIP = netaddr.IPNetwork(prefix).ip
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return (project_hash ^ static_num ^ mac_addr | maskIP).format()
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except netaddr.AddrFormatError:
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raise TypeError(_('Bad prefix for to_global_ipv6: %s') % prefix)
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def to_mac(ipv6_address):
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address = netaddr.IPAddress(ipv6_address)
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mask1 = netaddr.IPAddress('::ff:ffff')
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mac = netaddr.EUI(int(address & mask1)).words
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return ':'.join(['02', '16', '3e'] + ['%02x' % i for i in mac[3:6]])
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