IPv6: Satisfy unhinted assignments ordered by prefix length

diff --git a/interface-ip.c b/interface-ip.c
index 44dd63dd928c031d1304feb1775d7f17eeaf5faf..3b6be6b6aa803412bd48ac68d18c1e032279cf54 100644 (file)
--- a/interface-ip.c
+++ b/interface-ip.c
@@ -729,7 +729,16 @@ static void interface_update_prefix_assignments(struct device_prefix *prefix, bo
                                netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
                                                "of size %hhu for %s, trying other\n", c->length, c->name);
                        }
-                       list_add_tail(&c->head, &assign_later);
+
+                       struct list_head *next = &assign_later;
+                       struct device_prefix_assignment *n;
+                       list_for_each_entry(n, &assign_later, head) {
+                               if (n->length > c->length) {
+                                       next = &n->head;
+                                       break;
+                               }
+                       }
+                       list_add_tail(&c->head, next);
                }
 
                if (c->assigned != -1)