__be32 src, __be32 dst, __u8 proto,
__u8 tos, __u8 ttl, __be16 df, bool xnet);
+struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, bool gre_csum,
+ int gso_type_mask);
+
static inline void iptunnel_xmit_stats(int err,
struct net_device_stats *err_stats,
struct pcpu_tstats __percpu *stats)