4 files changed, 31 insertions, 50 deletions

diff --git a/include/net/addrconf.h b/include/net/addrconf.h
index d89b0bc7ab75..bdcc863a60a4 100644
--- a/include/net/addrconf.h
+++ b/include/net/addrconf.h
@@ -71,6 +71,10 @@ extern int			ipv6_chk_addr(struct net *net,
 extern int                      ipv6_chk_home_addr(struct net *net,
                                                    struct in6_addr *addr);
 #endif
+
+extern int                      ipv6_chk_prefix(struct in6_addr *addr,
+                                                struct net_device *dev);
+
 extern struct inet6_ifaddr      *ipv6_get_ifaddr(struct net *net,
                                                  struct in6_addr *addr,
                                                  struct net_device *dev,
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 5ab9973571ef..c17f8c0b933e 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1249,6 +1249,31 @@ int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
         return ifp != NULL;
 }
 
+int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
+{
+        struct inet6_dev *idev;
+        struct inet6_ifaddr *ifa;
+        int     onlink;
+
+        onlink = 0;
+        rcu_read_lock();
+        idev = __in6_dev_get(dev);
+        if (idev) {
+                read_lock_bh(&idev->lock);
+                for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
+                        onlink = ipv6_prefix_equal(addr, &ifa->addr,
+                                                   ifa->prefix_len);
+                        if (onlink)
+                                break;
+                }
+                read_unlock_bh(&idev->lock);
+        }
+        rcu_read_unlock();
+        return onlink;
+}
+
+EXPORT_SYMBOL(ipv6_chk_prefix);
+
 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, struct in6_addr *addr,
                                      struct net_device *dev, int strict)
 {
diff --git a/net/ipv6/anycast.c b/net/ipv6/anycast.c
index 463bd95d6b13..36e817492095 100644
--- a/net/ipv6/anycast.c
+++ b/net/ipv6/anycast.c
@@ -48,29 +48,6 @@ static int ipv6_dev_ac_dec(struct net_device *dev, struct in6_addr *addr);
 /* Big ac list lock for all the sockets */
 static DEFINE_RWLOCK(ipv6_sk_ac_lock);
 
-static int
-ip6_onlink(struct in6_addr *addr, struct net_device *dev)
-{
-        struct inet6_dev        *idev;
-        struct inet6_ifaddr     *ifa;
-        int     onlink;
-
-        onlink = 0;
-        rcu_read_lock();
-        idev = __in6_dev_get(dev);
-        if (idev) {
-                read_lock_bh(&idev->lock);
-                for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
-                        onlink = ipv6_prefix_equal(addr, &ifa->addr,
-                                                   ifa->prefix_len);
-                        if (onlink)
-                                break;
-                }
-                read_unlock_bh(&idev->lock);
-        }
-        rcu_read_unlock();
-        return onlink;
-}
 
 /*
  *      socket join an anycast group
@@ -142,7 +119,7 @@ int ipv6_sock_ac_join(struct sock *sk, int ifindex, struct in6_addr *addr)
          * This obviates the need for propagating anycast routes while
          * still allowing some non-router anycast participation.
          */
-        if (!ip6_onlink(addr, dev)) {
+        if (!ipv6_chk_prefix(addr, dev)) {
                 if (ishost)
                         err = -EADDRNOTAVAIL;
                 if (err)
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 08a483a8de50..cc16fe07bbff 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -344,31 +344,6 @@ out:
         return 0;
 }
 
-/* copied directly from anycast.c */
-static int
-ipip6_onlink(struct in6_addr *addr, struct net_device *dev)
-{
-        struct inet6_dev        *idev;
-        struct inet6_ifaddr     *ifa;
-        int     onlink;
-
-        onlink = 0;
-        rcu_read_lock();
-        idev = __in6_dev_get(dev);
-        if (idev) {
-                read_lock_bh(&idev->lock);
-                for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
-                        onlink = ipv6_prefix_equal(addr, &ifa->addr,
-                                                   ifa->prefix_len);
-                        if (onlink)
-                                break;
-                }
-                read_unlock_bh(&idev->lock);
-        }
-        rcu_read_unlock();
-        return onlink;
-}
-
 static int
 isatap_chksrc(struct sk_buff *skb, struct iphdr *iph, struct ip_tunnel *t)
 {
@@ -386,7 +361,7 @@ isatap_chksrc(struct sk_buff *skb, struct iphdr *iph, struct ip_tunnel *t)
                 struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
                 if (ipv6_addr_is_isatap(addr6) &&
                     (addr6->s6_addr32[3] == iph->saddr) &&
-                    ipip6_onlink(addr6, t->dev))
+                    ipv6_chk_prefix(addr6, t->dev))
                         skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
                 else
                         ok = 0;