1 files changed, 36 insertions, 16 deletions

diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 8fab9b0bb203..909ecb3c2a33 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -844,6 +844,19 @@ static void neigh_invalidate(struct neighbour *neigh)
 	skb_queue_purge(&neigh->arp_queue);
 }
 
+static void neigh_probe(struct neighbour *neigh)
+	__releases(neigh->lock)
+{
+	struct sk_buff *skb = skb_peek(&neigh->arp_queue);
+	/* keep skb alive even if arp_queue overflows */
+	if (skb)
+		skb = skb_copy(skb, GFP_ATOMIC);
+	write_unlock(&neigh->lock);
+	neigh->ops->solicit(neigh, skb);
+	atomic_inc(&neigh->probes);
+	kfree_skb(skb);
+}
+
 /* Called when a timer expires for a neighbour entry. */
 
 static void neigh_timer_handler(unsigned long arg)
@@ -920,14 +933,7 @@ static void neigh_timer_handler(unsigned long arg)
 			neigh_hold(neigh);
 	}
 	if (neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) {
-		struct sk_buff *skb = skb_peek(&neigh->arp_queue);
-		/* keep skb alive even if arp_queue overflows */
-		if (skb)
-			skb = skb_copy(skb, GFP_ATOMIC);
-		write_unlock(&neigh->lock);
-		neigh->ops->solicit(neigh, skb);
-		atomic_inc(&neigh->probes);
-		kfree_skb(skb);
+		neigh_probe(neigh);
 	} else {
 out:
 		write_unlock(&neigh->lock);
@@ -942,7 +948,7 @@ out:
 int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb)
 {
 	int rc;
-	unsigned long now;
+	bool immediate_probe = false;
 
 	write_lock_bh(&neigh->lock);
 
@@ -950,14 +956,16 @@ int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb)
 	if (neigh->nud_state & (NUD_CONNECTED | NUD_DELAY | NUD_PROBE))
 		goto out_unlock_bh;
 
-	now = jiffies;
-
 	if (!(neigh->nud_state & (NUD_STALE | NUD_INCOMPLETE))) {
 		if (neigh->parms->mcast_probes + neigh->parms->app_probes) {
+			unsigned long next, now = jiffies;
+
 			atomic_set(&neigh->probes, neigh->parms->ucast_probes);
 			neigh->nud_state     = NUD_INCOMPLETE;
-			neigh->updated = jiffies;
-			neigh_add_timer(neigh, now + 1);
+			neigh->updated = now;
+			next = now + max(neigh->parms->retrans_time, HZ/2);
+			neigh_add_timer(neigh, next);
+			immediate_probe = true;
 		} else {
 			neigh->nud_state = NUD_FAILED;
 			neigh->updated = jiffies;
@@ -989,7 +997,11 @@ int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb)
 		rc = 1;
 	}
 out_unlock_bh:
-	write_unlock_bh(&neigh->lock);
+	if (immediate_probe)
+		neigh_probe(neigh);
+	else
+		write_unlock(&neigh->lock);
+	local_bh_enable();
 	return rc;
 }
 EXPORT_SYMBOL(__neigh_event_send);
@@ -1156,10 +1168,14 @@ int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new,
 			struct dst_entry *dst = skb_dst(skb);
 			struct neighbour *n2, *n1 = neigh;
 			write_unlock_bh(&neigh->lock);
+
+			rcu_read_lock();
 			/* On shaper/eql skb->dst->neighbour != neigh :( */
 			if (dst && (n2 = dst_get_neighbour(dst)) != NULL)
 				n1 = n2;
 			n1->output(n1, skb);
+			rcu_read_unlock();
+
 			write_lock_bh(&neigh->lock);
 		}
 		skb_queue_purge(&neigh->arp_queue);
@@ -1319,11 +1335,15 @@ static void neigh_proxy_process(unsigned long arg)
 
 		if (tdif <= 0) {
 			struct net_device *dev = skb->dev;
+
 			__skb_unlink(skb, &tbl->proxy_queue);
-			if (tbl->proxy_redo && netif_running(dev))
+			if (tbl->proxy_redo && netif_running(dev)) {
+				rcu_read_lock();
 				tbl->proxy_redo(skb);
-			else
+				rcu_read_unlock();
+			} else {
 				kfree_skb(skb);
+			}
 
 			dev_put(dev);
 		} else if (!sched_next || tdif < sched_next)