3 files changed, 45 insertions, 4 deletions

diff --git a/include/net/neighbour.h b/include/net/neighbour.h
index ebbfb509822e..64a5f0120b52 100644
--- a/include/net/neighbour.h
+++ b/include/net/neighbour.h
@@ -218,6 +218,10 @@ extern unsigned long		neigh_rand_reach_time(unsigned long base);
 extern void                     pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p,
                                                struct sk_buff *skb);
 extern struct pneigh_entry      *pneigh_lookup(struct neigh_table *tbl, struct net *net, const void *key, struct net_device *dev, int creat);
+extern struct pneigh_entry      *__pneigh_lookup(struct neigh_table *tbl,
+                                                 struct net *net,
+                                                 const void *key,
+                                                 struct net_device *dev);
 extern int                      pneigh_delete(struct neigh_table *tbl, struct net *net, const void *key, struct net_device *dev);
 
 extern void neigh_app_ns(struct neighbour *n);
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index d9a02b2cc289..19b8e003f150 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -466,6 +466,28 @@ out_neigh_release:
         goto out;
 }
 
+struct pneigh_entry *__pneigh_lookup(struct neigh_table *tbl,
+                struct net *net, const void *pkey, struct net_device *dev)
+{
+        struct pneigh_entry *n;
+        int key_len = tbl->key_len;
+        u32 hash_val = *(u32 *)(pkey + key_len - 4);
+
+        hash_val ^= (hash_val >> 16);
+        hash_val ^= hash_val >> 8;
+        hash_val ^= hash_val >> 4;
+        hash_val &= PNEIGH_HASHMASK;
+
+        for (n = tbl->phash_buckets[hash_val]; n; n = n->next) {
+                if (!memcmp(n->key, pkey, key_len) &&
+                    (n->net == net) &&
+                    (n->dev == dev || !n->dev))
+                        break;
+        }
+
+        return n;
+}
+
 struct pneigh_entry * pneigh_lookup(struct neigh_table *tbl,
                                     struct net *net, const void *pkey,
                                     struct net_device *dev, int creat)
@@ -2803,6 +2825,7 @@ EXPORT_SYMBOL(neigh_table_init_no_netlink);
 EXPORT_SYMBOL(neigh_update);
 EXPORT_SYMBOL(pneigh_enqueue);
 EXPORT_SYMBOL(pneigh_lookup);
+EXPORT_SYMBOL_GPL(__pneigh_lookup);
 
 #ifdef CONFIG_ARPD
 EXPORT_SYMBOL(neigh_app_ns);
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 51557c27a0cd..452a2ac4eec8 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -676,6 +676,20 @@ static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb)
         }
 }
 
+static struct pneigh_entry *pndisc_check_router(struct net_device *dev,
+                struct in6_addr *addr, int *is_router)
+{
+        struct pneigh_entry *n;
+
+        read_lock_bh(&nd_tbl.lock);
+        n = __pneigh_lookup(&nd_tbl, &init_net, addr, dev);
+        if (n != NULL)
+                *is_router = (n->flags & NTF_ROUTER);
+        read_unlock_bh(&nd_tbl.lock);
+
+        return n;
+}
+
 static void ndisc_recv_ns(struct sk_buff *skb)
 {
         struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);
@@ -692,7 +706,7 @@ static void ndisc_recv_ns(struct sk_buff *skb)
         struct pneigh_entry *pneigh = NULL;
         int dad = ipv6_addr_any(saddr);
         int inc;
-        int is_router;
+        int is_router = 0;
 
         if (ipv6_addr_is_multicast(&msg->target)) {
                 ND_PRINTK2(KERN_WARNING
@@ -790,8 +804,8 @@ static void ndisc_recv_ns(struct sk_buff *skb)
                 if (ipv6_chk_acast_addr(dev, &msg->target) ||
                     (idev->cnf.forwarding &&
                      (ipv6_devconf.proxy_ndp || idev->cnf.proxy_ndp) &&
-                     (pneigh = pneigh_lookup(&nd_tbl, &init_net,
-                                             &msg->target, dev, 0)) != NULL)) {
+                     (pneigh = pndisc_check_router(dev, &msg->target,
+                                                  &is_router)) != NULL)) {
                         if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) &&
                             skb->pkt_type != PACKET_HOST &&
                             inc != 0 &&
@@ -812,7 +826,7 @@ static void ndisc_recv_ns(struct sk_buff *skb)
                         goto out;
         }
 
-        is_router = !!(pneigh ? pneigh->flags & NTF_ROUTER : idev->cnf.forwarding);
+        is_router = !!(pneigh ? is_router : idev->cnf.forwarding);
 
         if (dad) {
                 struct in6_addr maddr;