1 files changed, 18 insertions, 4 deletions

diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index b4d8e331432e..e77b74edfd63 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -661,6 +661,20 @@ 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, dev_net(dev), 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);
@@ -677,7 +691,7 @@ 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
@@ -776,8 +790,8 @@ static void ndisc_recv_ns(struct sk_buff *skb)
                 if (ipv6_chk_acast_addr(dev_net(dev), dev, &msg->target) ||
                     (idev->cnf.forwarding &&
                      (ipv6_devconf.proxy_ndp || idev->cnf.proxy_ndp) &&
-                     (pneigh = pneigh_lookup(&nd_tbl, dev_net(dev),
-                                             &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 &&
@@ -798,7 +812,7 @@ 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;