From 013a9b91fe495371cbf9a5690613de45b634e3af Mon Sep 17 00:00:00 2001
From: Martin Mares <mj@ucw.cz>
Date: Sat, 13 Feb 1999 20:46:03 +0000
Subject: [PATCH] When shutting down, remove all routes (except for RTS_INHERIT
 and RTS_DEVICE routes) from kernel routing tables unless the "persist" switch
 is set.

---
 sysdep/unix/Modules   |  1 +
 sysdep/unix/krt-set.Y | 29 +++++++++++++++++++++++++++++
 sysdep/unix/krt-set.c | 26 ++++++++++++++++++++++++++
 sysdep/unix/krt-set.h |  1 +
 sysdep/unix/krt.h     |  1 +
 sysdep/unix/sync-rt.c |  1 +
 6 files changed, 59 insertions(+)
 create mode 100644 sysdep/unix/krt-set.Y

diff --git a/sysdep/unix/Modules b/sysdep/unix/Modules
index f6db6d35..2969ee45 100644
--- a/sysdep/unix/Modules
+++ b/sysdep/unix/Modules
@@ -9,5 +9,6 @@ krt.Y
 krt.h
 krt-set.c
 krt-set.h
+krt-set.Y
 krt-iface.h
 krt-iface.Y
diff --git a/sysdep/unix/krt-set.Y b/sysdep/unix/krt-set.Y
new file mode 100644
index 00000000..551ee16d
--- /dev/null
+++ b/sysdep/unix/krt-set.Y
@@ -0,0 +1,29 @@
+/*
+ *	BIRD -- UNIX Kernel Syncer Configuration
+ *
+ *	(c) 1998--1999 Martin Mares <mj@ucw.cz>
+ *
+ *	Can be freely distributed and used under the terms of the GNU GPL.
+ */
+
+CF_HDR
+
+#include "lib/krt-scan.h"
+
+CF_DECLS
+
+CF_KEYWORDS(PERSIST)
+
+CF_GRAMMAR
+
+CF_ADDTO(kern_proto, kern_proto krt_set_item ';')
+
+krt_set_item:
+   PERSIST bool {
+      ((struct krt_config *) this_proto)->setopt.persist = $2;
+   }
+ ;
+
+CF_CODE
+
+CF_END
diff --git a/sysdep/unix/krt-set.c b/sysdep/unix/krt-set.c
index 2f0abe66..e77015b3 100644
--- a/sysdep/unix/krt-set.c
+++ b/sysdep/unix/krt-set.c
@@ -133,3 +133,29 @@ void
 krt_set_preconfig(struct krt_config *c)
 {
 }
+
+void
+krt_set_shutdown(struct krt_proto *x)
+{
+  struct rtable *t = &master_table;
+
+  if (((struct krt_config *) x->p.cf)->setopt.persist)
+    return;
+  DBG("Flushing kernel routes...\n");
+  while (t && t->tos)
+    t = t->sibling;
+  if (!t)
+    return;
+  FIB_WALK(&t->fib, f)
+    {
+      net *n = (net *) f;
+      rte *e = n->routes;
+      if (e)
+	{
+	  rta *a = e->attrs;
+	  if (a->source != RTS_DEVICE && a->source != RTS_INHERIT)
+	    krt_remove_route(e);
+	}
+    }
+  FIB_WALK_END;
+} 
diff --git a/sysdep/unix/krt-set.h b/sysdep/unix/krt-set.h
index 53b11464..ec96e652 100644
--- a/sysdep/unix/krt-set.h
+++ b/sysdep/unix/krt-set.h
@@ -10,6 +10,7 @@
 #define _BIRD_KRT_SET_H_
 
 struct krt_set_params {
+  int persist;
 };
 
 struct krt_set_status {
diff --git a/sysdep/unix/krt.h b/sysdep/unix/krt.h
index 5631bc5c..9b630b27 100644
--- a/sysdep/unix/krt.h
+++ b/sysdep/unix/krt.h
@@ -52,6 +52,7 @@ void krt_scan_ifaces_done(struct krt_proto *);
 
 void krt_set_preconfig(struct krt_config *);
 void krt_set_start(struct krt_proto *);
+void krt_set_shutdown(struct krt_proto *);
 
 /* sync-if.c */
 
diff --git a/sysdep/unix/sync-rt.c b/sysdep/unix/sync-rt.c
index 094da1c2..99ef92a0 100644
--- a/sysdep/unix/sync-rt.c
+++ b/sysdep/unix/sync-rt.c
@@ -43,6 +43,7 @@ krt_shutdown(struct proto *p)
 
   krt_scan_shutdown(k);
   krt_if_shutdown(k);
+  krt_set_shutdown(k);
   return PS_DOWN;
 }