[src/trunk]: src/sys/netinet6 Make sure that prefixes get purged. This fixes ...

[tron <tron%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/171bba10329c
branches:  trunk
changeset: 579961:171bba10329c
user:      tron <tron%NetBSD.org@localhost>
date:      Sun Apr 03 11:02:27 2005 +0000

description:
Make sure that prefixes get purged. This fixes PR kern/21189,
PR kern/25968 and PR kern/27873.

diffstat:

 sys/netinet6/nd6.c |  11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

diffs (32 lines):

diff -r d60ed807b09b -r 171bba10329c sys/netinet6/nd6.c
--- a/sys/netinet6/nd6.c        Sun Apr 03 10:56:59 2005 +0000
+++ b/sys/netinet6/nd6.c        Sun Apr 03 11:02:27 2005 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: nd6.c,v 1.91 2004/12/04 16:10:25 peter Exp $   */
+/*     $NetBSD: nd6.c,v 1.92 2005/04/03 11:02:27 tron Exp $    */
 /*     $KAME: nd6.c,v 1.279 2002/06/08 11:16:51 itojun Exp $   */
 
 /*
@@ -31,7 +31,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: nd6.c,v 1.91 2004/12/04 16:10:25 peter Exp $");
+__KERNEL_RCSID(0, "$NetBSD: nd6.c,v 1.92 2005/04/03 11:02:27 tron Exp $");
 
 #include "opt_ipsec.h"
 
@@ -637,6 +637,13 @@
                npr = pr->ndpr_next;
                if (pr->ndpr_ifp == ifp) {
                        /*
+                        * Because if_detach() does *not* release prefixes
+                        * while purging addresses the reference count will
+                        * still be above zero. We therefore reset it to
+                        * make sure that the prefix really gets purged.
+                        */
+                       pr->ndpr_refcnt = 0;
+                       /*
                         * Previously, pr->ndpr_addr is removed as well,
                         * but I strongly believe we don't have to do it.
                         * nd6_purge() is only called from in6_ifdetach(),