From 2c9033afd5ce5e99255d248fb065e94534405da7 Mon Sep 17 00:00:00 2001
From: Ondrej Zajicek <santiago@crfreenet.org>
Date: Tue, 3 Aug 2010 08:26:47 +0200
Subject: [PATCH] Do not allow interdependent recursive routes.

---
 nest/rt-table.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/nest/rt-table.c b/nest/rt-table.c
index ef070428..389baaa2 100644
--- a/nest/rt-table.c
+++ b/nest/rt-table.c
@@ -1509,7 +1509,16 @@ rt_update_hostentry(rtable *tab, struct hostentry *he)
       rta *a = n->routes->attrs;
       pxlen = n->n.pxlen;
 
-      if (a->dest == RTD_DEVICE)
+      if (a->hostentry)
+	{
+	  /* Recursive route should not depend on another recursive route */
+	  log(L_WARN "Next hop address %I resolvable through recursive route for %I/%d",
+	      he->addr, n->n.prefix, n->n.pxlen);
+	  he->iface = NULL;
+	  he->gw = IPA_NONE;
+	  he->dest = RTD_UNREACHABLE;
+	}
+      else if (a->dest == RTD_DEVICE)
 	{
 	  if (if_local_addr(he->addr, a->iface))
 	    {