diff --git a/include/net/tcp.h b/include/net/tcp.h
index 149a415..e9b48b0 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -460,6 +460,9 @@
 extern void tcp_send_fin(struct sock *sk);
 extern void tcp_send_active_reset(struct sock *sk, gfp_t priority);
 extern int tcp_send_synack(struct sock *);
+extern int tcp_syn_flood_action(struct sock *sk,
+				const struct sk_buff *skb,
+				const char *proto);
 extern void tcp_push_one(struct sock *, unsigned int mss_now);
 extern void tcp_send_ack(struct sock *sk);
 extern void tcp_send_delayed_ack(struct sock *sk);