[src/trunk]: src/sys/netinet6 inet6: don't set an invalid lladdr in nd6_free()

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

details:   https://anonhg.NetBSD.org/src/rev/3adae2531e07
branches:  trunk
changeset: 453903:3adae2531e07
user:      roy <roy%NetBSD.org@localhost>
date:      Sat Aug 31 01:49:45 2019 +0000

description:
inet6: don't set an invalid lladdr in nd6_free()

We don't want to announce that we've deleted a hwaddr of all zeros.

diffstat:

 sys/netinet6/nd6.c |  9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diffs (37 lines):

diff -r c69ae5ab7b82 -r 3adae2531e07 sys/netinet6/nd6.c
--- a/sys/netinet6/nd6.c        Fri Aug 30 23:45:13 2019 +0000
+++ b/sys/netinet6/nd6.c        Sat Aug 31 01:49:45 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: nd6.c,v 1.260 2019/08/27 21:11:26 roy Exp $    */
+/*     $NetBSD: nd6.c,v 1.261 2019/08/31 01:49:45 roy 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 1.260 2019/08/27 21:11:26 roy Exp $");
+__KERNEL_RCSID(0, "$NetBSD: nd6.c,v 1.261 2019/08/31 01:49:45 roy Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_net_mpsafe.h"
@@ -1192,6 +1192,7 @@
        struct ifnet *ifp;
        struct in6_addr *in6;
        struct sockaddr_in6 sin6;
+       const char *lladdr;
 
        KASSERT(ln != NULL);
        LLE_WLOCK_ASSERT(ln);
@@ -1282,8 +1283,8 @@
        }
 
        sockaddr_in6_init(&sin6, in6, 0, 0, 0);
-       rt_clonedmsg(RTM_DELETE, sin6tosa(&sin6),
-           (const uint8_t *)&ln->ll_addr, ifp);
+       lladdr = ln->la_flags & LLE_VALID ? (const char *)&ln->ll_addr : NULL;
+       rt_clonedmsg(RTM_DELETE, sin6tosa(&sin6), lladdr, ifp);
 
        /*
         * Save to unlock. We still hold an extra reference and will not