1 files changed, 49 insertions, 16 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 4ab4c38958c..b78a3ee93d5 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1124,12 +1124,10 @@ retry:
 	if (ifp->flags & IFA_F_OPTIMISTIC)
 		addr_flags |= IFA_F_OPTIMISTIC;
 
-	ift = !max_addresses ||
-	      ipv6_count_addresses(idev) < max_addresses ?
-		ipv6_add_addr(idev, &addr, tmp_plen,
-			      ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
-			      addr_flags) : NULL;
-	if (IS_ERR_OR_NULL(ift)) {
+	ift = ipv6_add_addr(idev, &addr, tmp_plen,
+			    ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
+			    addr_flags);
+	if (IS_ERR(ift)) {
 		in6_ifa_put(ifp);
 		in6_dev_put(idev);
 		pr_info("%s: retry temporary address regeneration\n", __func__);
@@ -1448,6 +1446,23 @@ try_nextdev:
 }
 EXPORT_SYMBOL(ipv6_dev_get_saddr);
 
+int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
+		      unsigned char banned_flags)
+{
+	struct inet6_ifaddr *ifp;
+	int err = -EADDRNOTAVAIL;
+
+	list_for_each_entry(ifp, &idev->addr_list, if_list) {
+		if (ifp->scope == IFA_LINK &&
+		    !(ifp->flags & banned_flags)) {
+			*addr = ifp->addr;
+			err = 0;
+			break;
+		}
+	}
+	return err;
+}
+
 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
 		    unsigned char banned_flags)
 {
@@ -1457,17 +1472,8 @@ int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
 	rcu_read_lock();
 	idev = __in6_dev_get(dev);
 	if (idev) {
-		struct inet6_ifaddr *ifp;
-
 		read_lock_bh(&idev->lock);
-		list_for_each_entry(ifp, &idev->addr_list, if_list) {
-			if (ifp->scope == IFA_LINK &&
-			    !(ifp->flags & banned_flags)) {
-				*addr = ifp->addr;
-				err = 0;
-				break;
-			}
-		}
+		err = __ipv6_get_lladdr(idev, addr, banned_flags);
 		read_unlock_bh(&idev->lock);
 	}
 	rcu_read_unlock();
@@ -1527,6 +1533,33 @@ static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 	return false;
 }
 
+/* Compares an address/prefix_len with addresses on device @dev.
+ * If one is found it returns true.
+ */
+bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
+	const unsigned int prefix_len, struct net_device *dev)
+{
+	struct inet6_dev *idev;
+	struct inet6_ifaddr *ifa;
+	bool ret = false;
+
+	rcu_read_lock();
+	idev = __in6_dev_get(dev);
+	if (idev) {
+		read_lock_bh(&idev->lock);
+		list_for_each_entry(ifa, &idev->addr_list, if_list) {
+			ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
+			if (ret)
+				break;
+		}
+		read_unlock_bh(&idev->lock);
+	}
+	rcu_read_unlock();
+
+	return ret;
+}
+EXPORT_SYMBOL(ipv6_chk_custom_prefix);
+
 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
 {
 	struct inet6_dev *idev;