[TCP]: MD5 Signature Option (RFC2385) support.

Based on implementation by Rick Payne.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/request_sock.h b/include/net/request_sock.h
index b5b023e..e37baaf 100644
--- a/include/net/request_sock.h
+++ b/include/net/request_sock.h
@@ -35,7 +35,8 @@
 				       struct dst_entry *dst);
 	void		(*send_ack)(struct sk_buff *skb,
 				    struct request_sock *req);
-	void		(*send_reset)(struct sk_buff *skb);
+	void		(*send_reset)(struct sock *sk,
+				      struct sk_buff *skb);
 	void		(*destructor)(struct request_sock *req);
 };