[IPV6] NEIGH: Optimize is_router check.

Our interest is not the whole entry of proxy neighbor but the
NTF_ROUTER flag.  Let's test it explicitly.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>

1 files changed, 11 insertions, 11 deletions

diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index e77b74edfd63..510aa747a404 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -661,18 +661,19 @@ 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)
+static int pndisc_is_router(const void *pkey,
+                            struct net_device *dev)
 {
         struct pneigh_entry *n;
+        int ret = -1;
 
         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);
+        n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev);
+        if (n)
+                ret = !!(n->flags & NTF_ROUTER);
         read_unlock_bh(&nd_tbl.lock);
 
-        return n;
+        return ret;
 }
 
 static void ndisc_recv_ns(struct sk_buff *skb)
@@ -688,10 +689,9 @@ static void ndisc_recv_ns(struct sk_buff *skb)
         struct inet6_ifaddr *ifp;
         struct inet6_dev *idev = NULL;
         struct neighbour *neigh;
-        struct pneigh_entry *pneigh = NULL;
         int dad = ipv6_addr_any(saddr);
         int inc;
-        int is_router = 0;
+        int is_router = -1;
 
         if (ipv6_addr_is_multicast(&msg->target)) {
                 ND_PRINTK2(KERN_WARNING
@@ -790,8 +790,7 @@ 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 = pndisc_check_router(dev, &msg->target,
-                                                  &is_router)) != NULL)) {
+                     (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) {
                         if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) &&
                             skb->pkt_type != PACKET_HOST &&
                             inc != 0 &&
@@ -812,7 +811,8 @@ static void ndisc_recv_ns(struct sk_buff *skb)
                         goto out;
         }
 
-        is_router = !!(pneigh ? is_router : idev->cnf.forwarding);
+        if (is_router < 0)
+                is_router = !!idev->cnf.forwarding;
 
         if (dad) {
                 struct in6_addr maddr;