2 files changed, 40 insertions, 0 deletions
diff --git a/nest/route.h b/nest/route.h
index b927db5f..5421ece5 100644
--- a/nest/route.h
+++ b/nest/route.h
@@ -84,6 +84,8 @@ void fit_init(struct fib_iterator *, struct fib *); /* Internal functions, don't
 struct fib_node *fit_get(struct fib *, struct fib_iterator *);
 void fit_put(struct fib_iterator *, struct fib_node *);
 void fit_put_next(struct fib *f, struct fib_iterator *i, struct fib_node *n, uint hpos);
+void fit_put_end(struct fib_iterator *i);
+void fit_copy(struct fib *f, struct fib_iterator *dst, struct fib_iterator *src);
 
 
 #define FIB_WALK(fib, type, z) do {				\
@@ -118,8 +120,12 @@ void fit_put_next(struct fib *f, struct fib_iterator *i, struct fib_node *n, uin
 
 #define FIB_ITERATE_PUT_NEXT(it, fib) fit_put_next(fib, it, fn_, hpos_)
 
+#define FIB_ITERATE_PUT_END(it) fit_put_end(it)
+
 #define FIB_ITERATE_UNLINK(it, fib) fit_get(fib, it)
 
+#define FIB_ITERATE_COPY(dst, src, fib) fit_copy(fib, dst, src)
+
 
 /*
  *	Master Routing Tables. Generally speaking, each of them contains a FIB
diff --git a/nest/rt-fib.c b/nest/rt-fib.c
index 76a86e6e..a7f70371 100644
--- a/nest/rt-fib.c
+++ b/nest/rt-fib.c
@@ -584,6 +584,40 @@ found:
   fit_put(i, n);
 }
 
+void
+fit_put_end(struct fib_iterator *i)
+{
+  i->prev = i->next = NULL;
+  i->node = NULL;
+  i->hash = ~0 - 1;
+}
+
+void
+fit_copy(struct fib *f, struct fib_iterator *dst, struct fib_iterator *src)
+{
+  struct fib_iterator *nxt = src->next;
+
+  fit_get(f, dst);
+
+  if (!src->prev)
+  {
+    /* We are at the end */
+    fit_put_end(dst);
+    return;
+  }
+
+  src->next = dst;
+  dst->prev = src;
+
+  dst->next = nxt;
+  if (nxt)
+    nxt->prev = dst;
+
+  dst->node = src->node;
+  dst->hash = src->hash;
+}
+
+
 #ifdef DEBUGGING
 
 /**