1 files changed, 51 insertions, 12 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 840bfdb3d7bd..8e761b8c47c6 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -163,7 +163,7 @@ static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 
 static void addrconf_type_change(struct net_device *dev,
 				 unsigned long event);
-static int addrconf_ifdown(struct net_device *dev, int how);
+static int addrconf_ifdown(struct net_device *dev, bool unregister);
 
 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
 						  int plen,
@@ -1983,6 +1983,45 @@ int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
 }
 EXPORT_SYMBOL(ipv6_chk_prefix);
 
+/**
+ * ipv6_dev_find - find the first device with a given source address.
+ * @net: the net namespace
+ * @addr: the source address
+ *
+ * The caller should be protected by RCU, or RTNL.
+ */
+struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr)
+{
+	unsigned int hash = inet6_addr_hash(net, addr);
+	struct inet6_ifaddr *ifp, *result = NULL;
+	struct net_device *dev = NULL;
+
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
+		if (net_eq(dev_net(ifp->idev->dev), net) &&
+		    ipv6_addr_equal(&ifp->addr, addr)) {
+			result = ifp;
+			break;
+		}
+	}
+
+	if (!result) {
+		struct rt6_info *rt;
+
+		rt = rt6_lookup(net, addr, NULL, 0, NULL, 0);
+		if (rt) {
+			dev = rt->dst.dev;
+			ip6_rt_put(rt);
+		}
+	} else {
+		dev = result->idev->dev;
+	}
+	rcu_read_unlock();
+
+	return dev;
+}
+EXPORT_SYMBOL(ipv6_dev_find);
+
 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
 				     struct net_device *dev, int strict)
 {
@@ -3630,7 +3669,7 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
 		 * an L3 master device (e.g., VRF)
 		 */
 		if (info->upper_dev && netif_is_l3_master(info->upper_dev))
-			addrconf_ifdown(dev, 0);
+			addrconf_ifdown(dev, false);
 	}
 
 	return NOTIFY_OK;
@@ -3663,9 +3702,9 @@ static bool addr_is_local(const struct in6_addr *addr)
 		(IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
 }
 
-static int addrconf_ifdown(struct net_device *dev, int how)
+static int addrconf_ifdown(struct net_device *dev, bool unregister)
 {
-	unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN;
+	unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN;
 	struct net *net = dev_net(dev);
 	struct inet6_dev *idev;
 	struct inet6_ifaddr *ifa, *tmp;
@@ -3684,7 +3723,7 @@ static int addrconf_ifdown(struct net_device *dev, int how)
 	 * Step 1: remove reference to ipv6 device from parent device.
 	 *	   Do not dev_put!
 	 */
-	if (how) {
+	if (unregister) {
 		idev->dead = 1;
 
 		/* protected by rtnl_lock */
@@ -3698,7 +3737,7 @@ static int addrconf_ifdown(struct net_device *dev, int how)
 	/* combine the user config with event to determine if permanent
 	 * addresses are to be removed from address hash table
 	 */
-	if (!how && !idev->cnf.disable_ipv6) {
+	if (!unregister && !idev->cnf.disable_ipv6) {
 		/* aggregate the system setting and interface setting */
 		int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
 
@@ -3736,7 +3775,7 @@ restart:
 	addrconf_del_rs_timer(idev);
 
 	/* Step 2: clear flags for stateless addrconf */
-	if (!how)
+	if (!unregister)
 		idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
 
 	/* Step 3: clear tempaddr list */
@@ -3806,7 +3845,7 @@ restart:
 	write_unlock_bh(&idev->lock);
 
 	/* Step 5: Discard anycast and multicast list */
-	if (how) {
+	if (unregister) {
 		ipv6_ac_destroy_dev(idev);
 		ipv6_mc_destroy_dev(idev);
 	} else {
@@ -3816,7 +3855,7 @@ restart:
 	idev->tstamp = jiffies;
 
 	/* Last: Shot the device (if unregistered) */
-	if (how) {
+	if (unregister) {
 		addrconf_sysctl_unregister(idev);
 		neigh_parms_release(&nd_tbl, idev->nd_parms);
 		neigh_ifdown(&nd_tbl, dev);
@@ -4038,7 +4077,7 @@ static void addrconf_dad_work(struct work_struct *w)
 		in6_ifa_hold(ifp);
 		addrconf_dad_stop(ifp, 1);
 		if (disable_ipv6)
-			addrconf_ifdown(idev->dev, 0);
+			addrconf_ifdown(idev->dev, false);
 		goto out;
 	}
 
@@ -7187,9 +7226,9 @@ void addrconf_cleanup(void)
 	for_each_netdev(&init_net, dev) {
 		if (__in6_dev_get(dev) == NULL)
 			continue;
-		addrconf_ifdown(dev, 1);
+		addrconf_ifdown(dev, true);
 	}
-	addrconf_ifdown(init_net.loopback_dev, 2);
+	addrconf_ifdown(init_net.loopback_dev, true);
 
 	/*
 	 *	Check hash table.