1 files changed, 68 insertions, 0 deletions
diff --git a/src/migration-scripts/dhcpv6-server/1-to-2 b/src/migration-scripts/dhcpv6-server/1-to-2
new file mode 100644
index 0000000..ad30749
--- /dev/null
+++ b/src/migration-scripts/dhcpv6-server/1-to-2
@@ -0,0 +1,68 @@
+# 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'])