gre: export gre_build_header() function.
This is required for ovs gre module.
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/gre.h b/include/net/gre.h
index c6ea0c7..cbb9d51 100644
--- a/include/net/gre.h
+++ b/include/net/gre.h
@@ -32,6 +32,8 @@
int gre_cisco_register(struct gre_cisco_protocol *proto);
int gre_cisco_unregister(struct gre_cisco_protocol *proto);
+void gre_build_header(struct sk_buff *skb, const struct tnl_ptk_info *tpi,
+ int hdr_len);
static inline int ip_gre_calc_hlen(__be16 o_flags)
{