mpls: export mpls functions for use by mpls iptunnels

Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/mpls/internal.h b/net/mpls/internal.h
index 8cabeb5..2681a4b 100644
--- a/net/mpls/internal.h
+++ b/net/mpls/internal.h
@@ -50,7 +50,12 @@
 	return result;
 }
 
-int nla_put_labels(struct sk_buff *skb, int attrtype,  u8 labels, const u32 label[]);
-int nla_get_labels(const struct nlattr *nla, u32 max_labels, u32 *labels, u32 label[]);
+int nla_put_labels(struct sk_buff *skb, int attrtype,  u8 labels,
+		   const u32 label[]);
+int nla_get_labels(const struct nlattr *nla, u32 max_labels, u32 *labels,
+		   u32 label[]);
+bool mpls_output_possible(const struct net_device *dev);
+unsigned int mpls_dev_mtu(const struct net_device *dev);
+bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu);
 
 #endif /* MPLS_INTERNAL_H */