From c58a9139a71b1d9be6642aef1a21c1d432f2c797 Mon Sep 17 00:00:00 2001
From: henning <henning@openbsd.org>
Date: Sun, 9 Sep 2018 10:07:38 +0000
Subject: [PATCH] provide rtable_empty(), returns 1 if the rtable doesn't
 contain any routes ok bluhm

---
 sys/net/rtable.c | 23 ++++++++++++++++++++++-
 sys/net/rtable.h |  3 ++-
 2 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/sys/net/rtable.c b/sys/net/rtable.c
index b16499ccd79..9dd3e2ee542 100644
--- a/sys/net/rtable.c
+++ b/sys/net/rtable.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: rtable.c,v 1.63 2017/09/05 11:15:39 mpi Exp $ */
+/*	$OpenBSD: rtable.c,v 1.64 2018/09/09 10:07:38 henning Exp $ */
 
 /*
  * Copyright (c) 2014-2016 Martin Pieuchot
@@ -278,6 +278,27 @@ rtable_exists(unsigned int rtableid)
 	return (0);
 }
 
+int
+rtable_empty(unsigned int rtableid)
+{
+	struct domain	*dp;
+	int		 i;
+	struct art_root	*tbl;
+
+	for (i = 0; (dp = domains[i]) != NULL; i++) {
+		if (dp->dom_rtoffset == 0)
+			continue;
+
+		tbl = rtable_get(rtableid, dp->dom_family);
+		if (tbl == NULL)
+			continue;
+		if (tbl->ar_root.ref != NULL)
+			return (0);
+	}
+
+	return (1);
+}
+
 unsigned int
 rtable_l2(unsigned int rtableid)
 {
diff --git a/sys/net/rtable.h b/sys/net/rtable.h
index 6df75dd040a..57093723d4f 100644
--- a/sys/net/rtable.h
+++ b/sys/net/rtable.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: rtable.h,v 1.20 2017/08/02 08:38:28 mpi Exp $ */
+/*	$OpenBSD: rtable.h,v 1.21 2018/09/09 10:07:38 henning Exp $ */
 
 /*
  * Copyright (c) 2014-2016 Martin Pieuchot
@@ -49,6 +49,7 @@ int		 rtable_satoplen(sa_family_t, struct sockaddr *);
 
 void		 rtable_init(void);
 int		 rtable_exists(unsigned int);
+int		 rtable_empty(unsigned int);
 int		 rtable_add(unsigned int);
 unsigned int	 rtable_l2(unsigned int);
 unsigned int	 rtable_loindex(unsigned int);
-- 
2.20.1