inet: prepare sock_edemux() & sock_gen_put() for new SYN_RECV state

sock_edemux() & sock_gen_put() should be ready to cope with request socks.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/request_sock.h

@@ -77,6 +77,11 @@ static inline struct request_sock *reqsk_alloc(const struct request_sock_ops *op
 	return req;
 }
 
+static inline struct request_sock *inet_reqsk(struct sock *sk)
+{
+	return (struct request_sock *)sk;
+}
+
 static inline void __reqsk_free(struct request_sock *req)
 {
 	kmem_cache_free(req->rsk_ops->slab, req);

include/net/sock.h

@@ -1625,7 +1625,7 @@ static inline void sock_put(struct sock *sk)
 		sk_free(sk);
 }
 /* Generic version of sock_put(), dealing with all sockets
- * (TCP_TIMEWAIT, ESTABLISHED...)
+ * (TCP_TIMEWAIT, TCP_NEW_SYN_RECV, ESTABLISHED...)
  */
 void sock_gen_put(struct sock *sk);
 

net/core/sock.c

@@ -1668,6 +1668,8 @@ void sock_edemux(struct sk_buff *skb)
 
 	if (sk->sk_state == TCP_TIME_WAIT)
 		inet_twsk_put(inet_twsk(sk));
+	else if (sk->sk_state == TCP_NEW_SYN_RECV)
+		reqsk_put(inet_reqsk(sk));
 	else
 		sock_put(sk);
 }

net/ipv4/inet_hashtables.c

@@ -262,6 +262,8 @@ void sock_gen_put(struct sock *sk)
 
 	if (sk->sk_state == TCP_TIME_WAIT)
 		inet_twsk_free(inet_twsk(sk));
+	else if (sk->sk_state == TCP_NEW_SYN_RECV)
+		reqsk_free(inet_reqsk(sk));
 	else
 		sk_free(sk);
 }