static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack,
			    u32 win, u32 tsval, u32 tsecr,
			    struct tcp_md5sig_key *key, u8 tclass,
			    u32 label)
{
	tcp_v6_send_response(skb, seq, ack, win, tsval, tsecr, key, 0, tclass,
			     label);
}
static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack,
			    u32 win, u32 tsval, u32 tsecr,
			    struct tcp_md5sig_key *key, u8 tclass,
			    u32 label)
{
	tcp_v6_send_response(skb, seq, ack, win, tsval, tsecr, key, 0, tclass,
			     label);
}