Add skb_is_gso_v6

Add skb_is_gso_v6().

Signed-off-by: Brice Goglin <brice@myri.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index a656cec..8101e8b 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1781,6 +1781,11 @@
 	return skb_shinfo(skb)->gso_size;
 }
 
+static inline int skb_is_gso_v6(const struct sk_buff *skb)
+{
+	return skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6;
+}
+
 static inline void skb_forward_csum(struct sk_buff *skb)
 {
 	/* Unfortunately we don't support this one.  Any brave souls? */