88 lines
2.9 KiB
Python
88 lines
2.9 KiB
Python
# Copyright 2013 IBM Corp.
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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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"""
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IPv6-related utilities and helper functions.
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"""
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import os
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import netaddr
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from neutron_lib import constants as const
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from oslo_log import log
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from neutron._i18n import _, _LI
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from neutron.common import constants
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LOG = log.getLogger(__name__)
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_IS_IPV6_ENABLED = None
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def get_ipv6_addr_by_EUI64(prefix, mac):
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# Check if the prefix is IPv4 address
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isIPv4 = netaddr.valid_ipv4(prefix)
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if isIPv4:
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msg = _("Unable to generate IP address by EUI64 for IPv4 prefix")
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raise TypeError(msg)
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try:
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eui64 = int(netaddr.EUI(mac).eui64())
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prefix = netaddr.IPNetwork(prefix)
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return netaddr.IPAddress(prefix.first + eui64 ^ (1 << 57))
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except (ValueError, netaddr.AddrFormatError):
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raise TypeError(_('Bad prefix or mac format for generating IPv6 '
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'address by EUI-64: %(prefix)s, %(mac)s:')
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% {'prefix': prefix, 'mac': mac})
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except TypeError:
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raise TypeError(_('Bad prefix type for generate IPv6 address by '
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'EUI-64: %s') % prefix)
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def is_enabled():
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global _IS_IPV6_ENABLED
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if _IS_IPV6_ENABLED is None:
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disabled_ipv6_path = "/proc/sys/net/ipv6/conf/default/disable_ipv6"
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if os.path.exists(disabled_ipv6_path):
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with open(disabled_ipv6_path, 'r') as f:
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disabled = f.read().strip()
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_IS_IPV6_ENABLED = disabled == "0"
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else:
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_IS_IPV6_ENABLED = False
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if not _IS_IPV6_ENABLED:
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LOG.info(_LI("IPv6 is not enabled on this system."))
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return _IS_IPV6_ENABLED
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def is_auto_address_subnet(subnet):
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"""Check if subnet is an auto address subnet."""
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modes = [constants.IPV6_SLAAC, constants.DHCPV6_STATELESS]
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return (subnet['ipv6_address_mode'] in modes
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or subnet['ipv6_ra_mode'] in modes)
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def is_eui64_address(ip_address):
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"""Check if ip address is EUI64."""
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ip = netaddr.IPAddress(ip_address)
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# '0xfffe' addition is used to build EUI-64 from MAC (RFC4291)
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# Look for it in the middle of the EUI-64 part of address
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return ip.version == 6 and not ((ip & 0xffff000000) ^ 0xfffe000000)
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def is_ipv6_pd_enabled(subnet):
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"""Returns True if the subnetpool_id of the given subnet is equal to
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constants.IPV6_PD_POOL_ID
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"""
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return subnet.get('subnetpool_id') == const.IPV6_PD_POOL_ID
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