1 files changed, 14 insertions, 9 deletions

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index d62b05d33384..b2ba5581d2ae 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -287,12 +287,12 @@ static struct rtable *rt_cache_get_first(struct seq_file *seq)
                 if (!rt_hash_table[st->bucket].chain)
                         continue;
                 rcu_read_lock_bh();
-                r = rcu_dereference(rt_hash_table[st->bucket].chain);
+                r = rcu_dereference_bh(rt_hash_table[st->bucket].chain);
                 while (r) {
                         if (dev_net(r->u.dst.dev) == seq_file_net(seq) &&
                             r->rt_genid == st->genid)
                                 return r;
-                        r = rcu_dereference(r->u.dst.rt_next);
+                        r = rcu_dereference_bh(r->u.dst.rt_next);
                 }
                 rcu_read_unlock_bh();
         }
@@ -314,7 +314,7 @@ static struct rtable *__rt_cache_get_next(struct seq_file *seq,
                 rcu_read_lock_bh();
                 r = rt_hash_table[st->bucket].chain;
         }
-        return rcu_dereference(r);
+        return rcu_dereference_bh(r);
 }
 
 static struct rtable *rt_cache_get_next(struct seq_file *seq,
@@ -1990,8 +1990,13 @@ static int __mkroute_input(struct sk_buff *skb,
         if (skb->protocol != htons(ETH_P_IP)) {
                 /* Not IP (i.e. ARP). Do not create route, if it is
                  * invalid for proxy arp. DNAT routes are always valid.
+                 *
+                 * Proxy arp feature have been extended to allow, ARP
+                 * replies back to the same interface, to support
+                 * Private VLAN switch technologies. See arp.c.
                  */
-                if (out_dev == in_dev) {
+                if (out_dev == in_dev &&
+                    IN_DEV_PROXY_ARP_PVLAN(in_dev) == 0) {
                         err = -EINVAL;
                         goto cleanup;
                 }
@@ -2689,8 +2694,8 @@ int __ip_route_output_key(struct net *net, struct rtable **rp,
         hash = rt_hash(flp->fl4_dst, flp->fl4_src, flp->oif, rt_genid(net));
 
         rcu_read_lock_bh();
-        for (rth = rcu_dereference(rt_hash_table[hash].chain); rth;
-                rth = rcu_dereference(rth->u.dst.rt_next)) {
+        for (rth = rcu_dereference_bh(rt_hash_table[hash].chain); rth;
+                rth = rcu_dereference_bh(rth->u.dst.rt_next)) {
                 if (rth->fl.fl4_dst == flp->fl4_dst &&
                     rth->fl.fl4_src == flp->fl4_src &&
                     rth->fl.iif == 0 &&
@@ -3008,8 +3013,8 @@ int ip_rt_dump(struct sk_buff *skb,  struct netlink_callback *cb)
                 if (!rt_hash_table[h].chain)
                         continue;
                 rcu_read_lock_bh();
-                for (rt = rcu_dereference(rt_hash_table[h].chain), idx = 0; rt;
-                     rt = rcu_dereference(rt->u.dst.rt_next), idx++) {
+                for (rt = rcu_dereference_bh(rt_hash_table[h].chain), idx = 0; rt;
+                     rt = rcu_dereference_bh(rt->u.dst.rt_next), idx++) {
                         if (!net_eq(dev_net(rt->u.dst.dev), net) || idx < s_idx)
                                 continue;
                         if (rt_is_expired(rt))
@@ -3329,7 +3334,7 @@ static __net_initdata struct pernet_operations rt_secret_timer_ops = {
 
 
 #ifdef CONFIG_NET_CLS_ROUTE
-struct ip_rt_acct *ip_rt_acct __read_mostly;
+struct ip_rt_acct __percpu *ip_rt_acct __read_mostly;
 #endif /* CONFIG_NET_CLS_ROUTE */
 
 static __initdata unsigned long rhash_entries;