X-Git-Url: https://vcs.maemo.org/git/?a=blobdiff_plain;f=net%2Fipv6%2Faddrconf.c;h=924158393d048f89c6168b7c505ce0719bbbdbd7;hb=8eefca4888c986d993b2571eb31f0397a5d0a178;hp=dbc51af690171ef14877316b871f3781ded554bd;hpb=549e028d012fab01e5726943d4afecd0c33d64e6;p=h-e-n

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index dbc51af..9241583 100644
--- 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)
 {