From 7f6545b188b7ad00a2ba4bf2dc7281bca93f05bf Mon Sep 17 00:00:00 2001
From: Miaosen Wang <secretandanon@gmail.com>
Date: Mon, 23 Feb 2026 23:31:26 -0800
Subject: T8302: This PR adds Router Advertisement (RA) base-interface support
 for IPv6 wildcard prefix derivation and includes validation and smoketests.

Included changes:
- Add `base-interface` under:
  - `service router-advert interface <lan-if> prefix ::/64 base-interface <wan-if>`
- Render `Base6Interface <wan-if>;` in `radvd.conf` when configured.
- Add validation guard:
  - `base-interface` is only allowed with wildcard prefix `::/64`.
- Extend smoketests:
  - Positive case: `::/64` + `base-interface` commits and renders correctly.
  - Negative case: non-`::/64` prefix with `base-interface` fails commit.
---
 interface-definitions/service_router-advert.xml.in | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'interface-definitions')

diff --git a/interface-definitions/service_router-advert.xml.in b/interface-definitions/service_router-advert.xml.in
index dc7164abc..878b53e78 100644
--- a/interface-definitions/service_router-advert.xml.in
+++ b/interface-definitions/service_router-advert.xml.in
@@ -305,6 +305,21 @@
                       <valueless/>
                     </properties>
                   </leafNode>
+                  <leafNode name="base-interface">
+                    <properties>
+                      <help>Prefix will be combined with IPv6 address of specified interface</help>
+                      <completionHelp>
+                        <script>${vyos_completion_dir}/list_interfaces</script>
+                      </completionHelp>
+                      <valueHelp>
+                        <format>txt</format>
+                        <description>Interface name</description>
+                      </valueHelp>
+                      <constraint>
+                        #include <include/constraint/interface-name.xml.i>
+                      </constraint>
+                    </properties>
+                  </leafNode>
                   <leafNode name="preferred-lifetime">
                     <properties>
                       <help>Time in seconds that the prefix will remain preferred</help>
-- 
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