1 files changed, 14 insertions, 7 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index e83852a..717584b 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -590,6 +590,7 @@ ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 {
 	struct inet6_ifaddr *ifa = NULL;
 	struct rt6_info *rt;
+	struct net *net = dev_net(idev->dev);
 	int hash;
 	int err = 0;
 	int addr_type = ipv6_addr_type(addr);
@@ -606,6 +607,11 @@ ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 		goto out2;
 	}
 
+	if (idev->cnf.disable_ipv6 || net->ipv6.devconf_all->disable_ipv6) {
+		err = -EACCES;
+		goto out2;
+	}
+
 	write_lock(&addrconf_hash_lock);
 
 	/* Ignore adding duplicate addresses on an interface */
@@ -1433,6 +1439,11 @@ static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
 {
 	struct inet6_dev *idev = ifp->idev;
+
+	if (net_ratelimit())
+		printk(KERN_INFO "%s: IPv6 duplicate address detected!\n",
+			ifp->idev->dev->name);
+
 	if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
 		struct in6_addr addr;
 
@@ -1443,11 +1454,12 @@ void addrconf_dad_failure(struct inet6_ifaddr *ifp)
 		    ipv6_addr_equal(&ifp->addr, &addr)) {
 			/* DAD failed for link-local based on MAC address */
 			idev->cnf.disable_ipv6 = 1;
+
+			printk(KERN_INFO "%s: IPv6 being disabled!\n",
+				ifp->idev->dev->name);
 		}
 	}
 
-	if (net_ratelimit())
-		printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
 	addrconf_dad_stop(ifp);
 }
 
@@ -2823,11 +2835,6 @@ static void addrconf_dad_timer(unsigned long data)
 		read_unlock_bh(&idev->lock);
 		goto out;
 	}
-	if (idev->cnf.accept_dad > 1 && idev->cnf.disable_ipv6) {
-		read_unlock_bh(&idev->lock);
-		addrconf_dad_failure(ifp);
-		return;
-	}
 	spin_lock_bh(&ifp->lock);
 	if (ifp->probes == 0) {
 		/*