From 9de9537b3a033015457e1f073477c4dde54974b7 Mon Sep 17 00:00:00 2001
From: florian <florian@openbsd.org>
Date: Thu, 12 Jul 2018 16:07:35 +0000
Subject: [PATCH] Introduce RTM_CHGADDRATTR to inform userland on the route
 socket when an attribute of an address is changed. For now it's used when
 IPv6 duplicate address detection finishes.

With this slaacd(8) can find out if a configured address is not
duplicated without the need to poll.

OK phessler, benno, claudio
---
 sys/net/route.h        |  3 ++-
 sys/netinet6/nd6_nbr.c | 10 +++++++++-
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/sys/net/route.h b/sys/net/route.h
index 43386fa41a6..6643dd71dfb 100644
--- a/sys/net/route.h
+++ b/sys/net/route.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: route.h,v 1.171 2018/07/01 08:53:03 mpi Exp $	*/
+/*	$OpenBSD: route.h,v 1.172 2018/07/12 16:07:35 florian Exp $	*/
 /*	$NetBSD: route.h,v 1.9 1996/02/13 22:00:49 christos Exp $	*/
 
 /*
@@ -240,6 +240,7 @@ struct rt_msghdr {
 #define RTM_INVALIDATE	0x11	/* Invalidate cache of L2 route */
 #define RTM_BFD		0x12	/* bidirectional forwarding detection */
 #define RTM_PROPOSAL	0x13	/* proposal for netconfigd */
+#define RTM_CHGADDRATTR	0x14	/* address attribute change */
 
 #define RTV_MTU		0x1	/* init or lock _mtu */
 #define RTV_HOPCOUNT	0x2	/* init or lock _hopcount */
diff --git a/sys/netinet6/nd6_nbr.c b/sys/netinet6/nd6_nbr.c
index d63279a0b8b..a90f852b25e 100644
--- a/sys/netinet6/nd6_nbr.c
+++ b/sys/netinet6/nd6_nbr.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: nd6_nbr.c,v 1.123 2018/06/11 08:48:54 mpi Exp $	*/
+/*	$OpenBSD: nd6_nbr.c,v 1.124 2018/07/12 16:07:35 florian Exp $	*/
 /*	$KAME: nd6_nbr.c,v 1.61 2001/02/10 16:06:14 jinmei Exp $	*/
 
 /*
@@ -1100,6 +1100,9 @@ nd6_dad_start(struct ifaddr *ifa)
 	KASSERT(ia6->ia6_flags & IN6_IFF_TENTATIVE);
 	if ((ia6->ia6_flags & IN6_IFF_ANYCAST) || (!ip6_dad_count)) {
 		ia6->ia6_flags &= ~IN6_IFF_TENTATIVE;
+
+		rtm_addr(RTM_CHGADDRATTR, ifa);
+
 		return;
 	}
 
@@ -1248,6 +1251,8 @@ nd6_dad_timer(void *xifa)
 			 */
 			ia6->ia6_flags &= ~IN6_IFF_TENTATIVE;
 
+			rtm_addr(RTM_CHGADDRATTR, ifa);
+
 			nd6log((LOG_DEBUG,
 			    "%s: DAD complete for %s - no duplicates found\n",
 			    ifa->ifa_ifp->if_xname,
@@ -1291,6 +1296,9 @@ nd6_dad_duplicated(struct dadq *dp)
 	    ia6->ia_ifp->if_xname);
 
 	TAILQ_REMOVE(&dadq, dp, dad_list);
+
+	rtm_addr(RTM_CHGADDRATTR, dp->dad_ifa);
+
 	ifafree(dp->dad_ifa);
 	free(dp, M_IP6NDP, sizeof(*dp));
 	ip6_dad_pending--;
-- 
2.20.1