1 files changed, 29 insertions, 17 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 5f582f385abb..7a4bf7671285 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2649,11 +2649,11 @@ static int addrconf_ifdown(struct net_device *dev, int how)
 		write_lock_bh(&addrconf_hash_lock);
 		while ((ifa = *bifa) != NULL) {
 			if (ifa->idev == idev &&
-			    (how || !(ifa->flags&IFA_F_PERMANENT))) {
+			    (how || !(ifa->flags&IFA_F_PERMANENT) ||
+			     ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
 				*bifa = ifa->lst_next;
 				ifa->lst_next = NULL;
-				addrconf_del_timer(ifa);
-				in6_ifa_put(ifa);
+				__in6_ifa_put(ifa);
 				continue;
 			}
 			bifa = &ifa->lst_next;
@@ -2691,28 +2691,40 @@ static int addrconf_ifdown(struct net_device *dev, int how)
 #endif
 	bifa = &idev->addr_list;
 	while ((ifa = *bifa) != NULL) {
-		if (how == 0 && (ifa->flags&IFA_F_PERMANENT)) {
-			/* Retain permanent address on admin down */
+		addrconf_del_timer(ifa);
+
+		/* If just doing link down, and address is permanent
+		   and not link-local, then retain it. */
+		if (how == 0 &&
+		    (ifa->flags&IFA_F_PERMANENT) &&
+		    !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
 			bifa = &ifa->if_next;
 
-			/* Restart DAD if needed when link comes back up */
-			if ( !((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
-			       idev->cnf.accept_dad <= 0 ||
-			       (ifa->flags & IFA_F_NODAD)))
-				ifa->flags |= IFA_F_TENTATIVE;
+			/* If not doing DAD on this address, just keep it. */
+			if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
+			    idev->cnf.accept_dad <= 0 ||
+			    (ifa->flags & IFA_F_NODAD))
+				continue;
+
+			/* If it was tentative already, no need to notify */
+			if (ifa->flags & IFA_F_TENTATIVE)
+				continue;
+
+			/* Flag it for later restoration when link comes up */
+			ifa->flags |= IFA_F_TENTATIVE;
+			in6_ifa_hold(ifa);
 		} else {
 			*bifa = ifa->if_next;
 			ifa->if_next = NULL;
-
 			ifa->dead = 1;
-			write_unlock_bh(&idev->lock);
+		}
+		write_unlock_bh(&idev->lock);
 
-			__ipv6_ifa_notify(RTM_DELADDR, ifa);
-			atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
-			in6_ifa_put(ifa);
+		__ipv6_ifa_notify(RTM_DELADDR, ifa);
+		atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
+		in6_ifa_put(ifa);
 
-			write_lock_bh(&idev->lock);
-		}
+		write_lock_bh(&idev->lock);
 	}
 	write_unlock_bh(&idev->lock);