[src/trunk]: src/sys/netinet Allow Unicast Poll from RFC 1122 to bypass DaD c...

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

details:   https://anonhg.NetBSD.org/src/rev/43d4c114e21d
branches:  trunk
changeset: 351386:43d4c114e21d
user:      roy <roy%NetBSD.org@localhost>
date:      Sat Feb 11 15:37:30 2017 +0000

description:
Allow Unicast Poll from RFC 1122 to bypass DaD checking.

diffstat:

 sys/netinet/if_arp.c |  7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diffs (28 lines):

diff -r 442a5f04ec0f -r 43d4c114e21d sys/netinet/if_arp.c
--- a/sys/netinet/if_arp.c      Sat Feb 11 15:32:51 2017 +0000
+++ b/sys/netinet/if_arp.c      Sat Feb 11 15:37:30 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: if_arp.c,v 1.241 2017/02/07 02:38:08 ozaki-r Exp $     */
+/*     $NetBSD: if_arp.c,v 1.242 2017/02/11 15:37:30 roy Exp $ */
 
 /*-
  * Copyright (c) 1998, 2000, 2008 The NetBSD Foundation, Inc.
@@ -68,7 +68,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_arp.c,v 1.241 2017/02/07 02:38:08 ozaki-r Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_arp.c,v 1.242 2017/02/11 15:37:30 roy Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_ddb.h"
@@ -1161,7 +1161,8 @@
 
        /* DAD check, RFC 5227 */
        if (in_hosteq(isaddr, myaddr) ||
-           (in_nullhost(isaddr) && in_hosteq(itaddr, myaddr)))
+           (in_nullhost(isaddr) && in_hosteq(itaddr, myaddr)
+           && ISSET(m->m_flags, M_BCAST))) /* Allow Unicast Poll, RFC 1122 */
        {
                arp_dad_duplicated((struct ifaddr *)ia,
                    lla_snprintf(llabuf, ar_sha(ah), ah->ar_hln));