[NET]: Flush hw header caches on NETDEV_CHANGEADDR events.

include/net/neighbour.h

@@ -181,6 +181,7 @@ extern struct neighbour *	neigh_create(struct neigh_table *tbl,
 extern void			neigh_destroy(struct neighbour *neigh);
 extern int			__neigh_event_send(struct neighbour *neigh, struct sk_buff *skb);
 extern int			neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, int override, int arp);
+extern void			neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev);
 extern int			neigh_ifdown(struct neigh_table *tbl, struct net_device *dev);
 extern int			neigh_resolve_output(struct sk_buff *skb);
 extern int			neigh_connected_output(struct sk_buff *skb);

net/core/neighbour.c

@@ -50,6 +50,7 @@ static void neigh_timer_handler(unsigned long arg);
 static void neigh_app_notify(struct neighbour *n);
 #endif
 static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev);
+void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev);
 
 static int neigh_glbl_allocs;
 static struct neigh_table *neigh_tables;
@@ -168,6 +169,33 @@ static void pneigh_queue_purge(struct sk_buff_head *list)
 	}
 }
 
+void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev)
+{
+	int i;
+
+	write_lock_bh(&tbl->lock);
+
+	for (i=0; i <= NEIGH_HASHMASK; i++) {
+		struct neighbour *n, **np;
+
+		np = &tbl->hash_buckets[i];
+		while ((n = *np) != NULL) {
+			if (dev && n->dev != dev) {
+				np = &n->next;
+				continue;
+			}
+			*np = n->next;
+			write_lock_bh(&n->lock);
+			n->dead = 1;
+			neigh_del_timer(n);
+			write_unlock_bh(&n->lock);
+			neigh_release(n);
+		}
+	}
+
+        write_unlock_bh(&tbl->lock);
+}
+
 int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev)
 {
 	int i;

net/ipv4/arp.c

@@ -1071,6 +1071,26 @@ int arp_ioctl(unsigned int cmd, void *arg)
 	return err;
 }
 
+static int arp_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
+{
+	struct net_device *dev = ptr;
+
+	switch (event) {
+	case NETDEV_CHANGEADDR:
+		neigh_changeaddr(&arp_tbl, dev);
+		rt_cache_flush(0);
+		break;
+	default:
+		break;
+	}
+
+	return NOTIFY_DONE;
+}
+
+struct notifier_block arp_netdev_notifier = {
+	.notifier_call = arp_netdev_event,
+};
+
 /* Note, that it is not on notifier chain.
    It is necessary, that this routine was called after route cache will be
    flushed.
@@ -1103,6 +1123,7 @@ void __init arp_init(void)
 	neigh_sysctl_register(NULL, &arp_tbl.parms, NET_IPV4,
 			      NET_IPV4_NEIGH, "ipv4");
 #endif
+	register_netdevice_notifier(&arp_netdev_notifier);
 }
 
 #ifdef CONFIG_PROC_FS

net/ipv6/ndisc.c

@@ -1447,6 +1447,26 @@ int ndisc_rcv(struct sk_buff *skb)
 	return 0;
 }
 
+static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
+{
+	struct net_device *dev = ptr;
+
+	switch (event) {
+	case NETDEV_CHANGEADDR:
+		neigh_changeaddr(&nd_tbl, dev);
+		fib6_run_gc(0);
+		break;
+	default:
+		break;
+	}
+
+	return NOTIFY_DONE;
+}
+
+struct notifier_block ndisc_netdev_notifier = {
+	.notifier_call = ndisc_netdev_event,
+};
+
 int __init ndisc_init(struct net_proto_family *ops)
 {
 	struct ipv6_pinfo *np;
@@ -1480,6 +1500,7 @@ int __init ndisc_init(struct net_proto_family *ops)
 	neigh_sysctl_register(NULL, &nd_tbl.parms, NET_IPV6, NET_IPV6_NEIGH, "ipv6");
 #endif
 
+	register_netdevice_notifier(&ndisc_netdev_notifier);
 	return 0;
 }