-int udp_tunnel_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
- __be32 src, __be32 dst, __u8 tos, __u8 ttl,
- __be16 df, __be16 src_port, __be16 dst_port,
- bool xnet, bool nocheck);
+void udp_tunnel_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
+ __be32 src, __be32 dst, __u8 tos, __u8 ttl,
+ __be16 df, __be16 src_port, __be16 dst_port,
+ bool xnet, bool nocheck);