98c4c0876d
This is a partial revert ofd1fb423830. That patch attempted to allow the DHCP agent to manage IPv6 interfaces to avoid a KeyError in the subnet_interface_map. However, this led to races with router advertisements and static configuration (see bug 1627902). The correct fix was actually a very simple conditional that was broken because this map shouldn't have been referenced for IPv6 subnets in the first place. The force metadata option was shortcutting the whole evaluation so the agent was trying to add a metadata route to a v6 subnet. This patch undoes the v6 changes fromd1fb423830, corrects the conditional, and adds a simple unit test that ensures the branch doesn't throw and error. Closes-Bug: #1624079 Change-Id: Ide494b6333a4f1e279ab58aa27c0aa719e79545d (cherry picked from commitc0d0986e8b)
92 lines
3.1 KiB
Python
92 lines
3.1 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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from debtcollector import removals
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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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LOG = log.getLogger(__name__)
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_IS_IPV6_ENABLED = None
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@removals.remove(
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message="use get_ipv6_addr_by_EUI64 from oslo_utils.netutils",
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version="Newton",
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removal_version="Ocata")
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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 = [const.IPV6_SLAAC, const.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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