vpn: l2tp: T2264: migrate IPv6 prefix node to common CLI style

Combining multiple options into a single CLI node is considered bad practice.
IPv6 prefixes consited of the prefix itself and a mask send to the client in
one node only.

The following CLI parts have been migrated from

  client-ipv6-pool {
    delegate-prefix fc00:0:1::/48,64
    prefix 2001:db8::/64,64
  }

to

  client-ipv6-pool {
    delegate fc00:0:1::/48 {
      delegation-prefix 48
    }
    prefix 2001:db8::/48 {
      mask 64
    }
  }

Thus regular validation steps from the VyOS CLI can be used when a prefix is
configured.

1 files changed, 28 insertions, 0 deletions

diff --git a/src/migration-scripts/l2tp/2-to-3 b/src/migration-scripts/l2tp/2-to-3
index e24d1ffa9..bd0839e03 100755
--- a/src/migration-scripts/l2tp/2-to-3
+++ b/src/migration-scripts/l2tp/2-to-3
@@ -75,6 +75,34 @@ else:
             if config.exists(radius_base + ['server', server, 'req-limit']):
                 config.delete(radius_base + ['server', server, 'req-limit'])
 
+    # Migrate IPv6 prefixes
+    ipv6_base = base + ['client-ipv6-pool']
+    if config.exists(ipv6_base + ['prefix']):
+        prefix_old = config.return_values(ipv6_base + ['prefix'])
+        # delete old prefix CLI nodes
+        config.delete(ipv6_base + ['prefix'])
+        # create ned prefix tag node
+        config.set(ipv6_base + ['prefix'])
+        config.set_tag(ipv6_base + ['prefix'])
+
+        for p in prefix_old:
+            prefix = p.split(',')[0]
+            mask = p.split(',')[1]
+            config.set(ipv6_base + ['prefix', prefix, 'mask'], value=mask)
+
+    if config.exists(ipv6_base + ['delegate-prefix']):
+        prefix_old = config.return_values(ipv6_base + ['delegate-prefix'])
+        # delete old delegate prefix CLI nodes
+        config.delete(ipv6_base + ['delegate-prefix'])
+        # create ned delegation tag node
+        config.set(ipv6_base + ['delegate '])
+        config.set_tag(ipv6_base + ['delegate '])
+
+        for p in prefix_old:
+            prefix = p.split(',')[0]
+            mask = p.split(',')[1]
+            config.set(ipv6_base + ['delegate', prefix, 'mask'], value=mask)
+
     try:
         with open(file_name, 'w') as f:
             f.write(config.to_string())