Merge pull request #5463 from xcp-ng/filter-out-local-ipv6

ocaml/xapi/xapi_host.ml

@@ -20,6 +20,7 @@ let with_lock = Xapi_stdext_threads.Threadext.Mutex.execute
 
 module Unixext = Xapi_stdext_unix.Unixext
 open Xapi_host_helpers
+open Xapi_pif_helpers
 open Db_filter_types
 open Workload_balancing
 
@@ -2555,14 +2556,10 @@ let migrate_receive ~__context ~host ~network ~options:_ =
         let configuration_mode =
           Db.PIF.get_ipv6_configuration_mode ~__context ~self:pif
         in
-        match Db.PIF.get_IPv6 ~__context ~self:pif with
+        match Xapi_pif_helpers.get_non_link_ipv6 ~__context ~pif with
         | [] ->
             ("", configuration_mode)
-        | ip :: _ ->
-            (* The CIDR is also stored in the IPv6 field of a PIF. *)
-            let ipv6 =
-              match String.split_on_char '/' ip with hd :: _ -> hd | _ -> ""
-            in
+        | ipv6 :: _ ->
             (ipv6, configuration_mode)
       )
   in

ocaml/xapi/xapi_pif_helpers.ml

@@ -255,10 +255,22 @@ let is_device_underneath_same_type ~__context pif1 pif2 =
   in
   get_device_info pif1 = get_device_info pif2
 
+let get_non_link_ipv6 ~__context ~pif =
+  let valid_nonlink ipv6 =
+    let open Ipaddr.V6 in
+    ipv6
+    |> Prefix.of_string
+    |> Result.to_option
+    |> Fun.flip Option.bind @@ fun cidr ->
+       let addr = Prefix.address cidr in
+       match scope addr with Ipaddr.Link -> None | _ -> Some (to_string addr)
+  in
+  List.filter_map valid_nonlink (Db.PIF.get_IPv6 ~__context ~self:pif)
+
 let get_primary_address ~__context ~pif =
   match Db.PIF.get_primary_address_type ~__context ~self:pif with
   | `IPv4 -> (
     match Db.PIF.get_IP ~__context ~self:pif with "" -> None | ip -> Some ip
   )
   | `IPv6 ->
-      List.nth_opt (Db.PIF.get_IPv6 ~__context ~self:pif) 0
+      List.nth_opt (get_non_link_ipv6 ~__context ~pif) 0