72 lines
2.4 KiB
Python
72 lines
2.4 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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LOG = log.getLogger(__name__)
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_IS_IPV6_ENABLED = None
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def is_enabled_and_bind_by_default():
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"""Check if host has the IPv6 support and is configured to bind IPv6
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address to new interfaces by default.
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"""
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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("IPv6 not present or configured not to bind to new "
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"interfaces on this system. Please ensure IPv6 is "
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"enabled and /proc/sys/net/ipv6/conf/default/"
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"disable_ipv6 is set to 0 to enable IPv6.")
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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 = [const.IPV6_SLAAC, const.DHCPV6_STATELESS]
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return (subnet['ipv6_address_mode'] in modes or
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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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