freifunk: enable ZW6_${upstream}

hosts/containers/freifunk/default.nix

@@ -353,6 +353,26 @@ in {
         };
       '') upstreams)}
 
+      ${lib.concatStrings (lib.imap0 (i: upstream: ''
+        # OSPFv3 to receive a default route from ${upstream}
+        protocol ospf v3 ZW6_${upstream} {
+          ipv6 {
+            import filter {
+              preference = preference + ${toString (200 - i)};
+              accept;
+            };
+          };
+          area 0 {
+            interface "core" instance ${toString zentralwerk.lib.config.site.hosts.${upstream}.ospf.upstreamInstance} {
+              hello 10;
+              wait 20;
+              authentication cryptographic;
+              password "${pkgs.zentralwerk-ospf-message-digest-key}";
+            };
+          };
+        };
+      '') upstreams)}
+
       router id ${coreAddress};
     '';
   };