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# Copyright 2023-2024 VyOS maintainers and contributors <maintainers@vyos.io>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this library. If not, see <http://www.gnu.org/licenses/>.
# T3316: Migrate to Kea
# - Kea was meant to have support for key "prefix-highest" under PD which would allow an address range
# However this seems to have never been implemented. A conversion to prefix length is needed (where possible).
# Ref: https://lists.isc.org/pipermail/kea-users/2022-November/003686.html
# - Remove prefix temporary value, convert to multi leafNode (https://kea.readthedocs.io/en/kea-2.2.0/arm/dhcp6-srv.html#dhcpv6-server-limitations)
from vyos.configtree import ConfigTree
from vyos.utils.network import ipv6_prefix_length
base = ['service', 'dhcpv6-server', 'shared-network-name']
def migrate(config: ConfigTree) -> None:
if not config.exists(base):
# Nothing to do
return
for network in config.list_nodes(base):
if not config.exists(base + [network, 'subnet']):
continue
for subnet in config.list_nodes(base + [network, 'subnet']):
# Delete temporary value under address-range prefix, convert tagNode to leafNode multi
if config.exists(base + [network, 'subnet', subnet, 'address-range', 'prefix']):
prefix_base = base + [network, 'subnet', subnet, 'address-range', 'prefix']
prefixes = config.list_nodes(prefix_base)
config.delete(prefix_base)
for prefix in prefixes:
config.set(prefix_base, value=prefix, replace=False)
if config.exists(base + [network, 'subnet', subnet, 'prefix-delegation', 'prefix']):
prefix_base = base + [network, 'subnet', subnet, 'prefix-delegation', 'prefix']
config.set(prefix_base)
config.set_tag(prefix_base)
for start in config.list_nodes(base + [network, 'subnet', subnet, 'prefix-delegation', 'start']):
path = base + [network, 'subnet', subnet, 'prefix-delegation', 'start', start]
delegated_length = config.return_value(path + ['prefix-length'])
stop = config.return_value(path + ['stop'])
prefix_length = ipv6_prefix_length(start, stop)
# This range could not be converted into a simple prefix length and must be skipped
if not prefix_length:
continue
config.set(prefix_base + [start, 'delegated-length'], value=delegated_length)
config.set(prefix_base + [start, 'prefix-length'], value=prefix_length)
config.delete(base + [network, 'subnet', subnet, 'prefix-delegation', 'start'])
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