bundles/radvd: introduce, add to home.router

bundles/radvd/files/ip-down

@@ -0,0 +1,3 @@
+#!/bin/bash
+
+systemctl stop radvd

bundles/radvd/files/ip-up

@@ -0,0 +1,3 @@
+#!/bin/bash
+
+systemctl start radvd

bundles/radvd/files/radvd.conf

@@ -0,0 +1,16 @@
+% for interface, config in sorted(interfaces.items()):
+interface ${interface}
+{
+    AdvSendAdvert on;
+    prefix ${config.get('prefix', '::/64')}
+    {
+        AdvOnLink on;
+        AdvAutonomous on;
+        AdvRouterAddr on;
+    };
+    RDNSS ${' '.join(sorted(config['rdnss']))}
+    {
+        AdvRDNSSLifetime 900;
+    };
+};
+% endfor