Merge branch 'net-2.6.26-isatap-20080403' of git://git.linux-ipv6.org/gitroot/yoshfuj...

[h-e-n] / net / ipv6 / addrconf.c

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index dbc51af..9241583 100644 (file)
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1265,6 +1265,31 @@ 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)
 {