inet: remove sk_listener parameter from syn_ack_timeout()

It is not needed, and req->sk_listener points to the listener anyway.
request_sock argument can be const.
Signed-off-by: NEric Dumazet <edumazet@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/linux/dccp.h

@@ -317,6 +317,6 @@ static inline const char *dccp_role(const struct sock *sk)
 	return NULL;
 }
 
-extern void dccp_syn_ack_timeout(struct sock *sk, struct request_sock *req);
+extern void dccp_syn_ack_timeout(const struct request_sock *req);
 
 #endif /* _LINUX_DCCP_H */

include/net/request_sock.h

@@ -39,8 +39,7 @@ struct request_sock_ops {
 	void		(*send_reset)(struct sock *sk,
 				      struct sk_buff *skb);
 	void		(*destructor)(struct request_sock *req);
-	void		(*syn_ack_timeout)(struct sock *sk,
-					   struct request_sock *req);
+	void		(*syn_ack_timeout)(const struct request_sock *req);
 };
 
 int inet_rtx_syn_ack(struct sock *parent, struct request_sock *req);

include/net/tcp.h

@@ -433,7 +433,7 @@ int compat_tcp_getsockopt(struct sock *sk, int level, int optname,
 int compat_tcp_setsockopt(struct sock *sk, int level, int optname,
 			  char __user *optval, unsigned int optlen);
 void tcp_set_keepalive(struct sock *sk, int val);
-void tcp_syn_ack_timeout(struct sock *sk, struct request_sock *req);
+void tcp_syn_ack_timeout(const struct request_sock *req);
 int tcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock,
 		int flags, int *addr_len);
 void tcp_parse_options(const struct sk_buff *skb,

net/dccp/ipv4.c

@@ -576,7 +576,7 @@ static void dccp_v4_reqsk_destructor(struct request_sock *req)
 	kfree(inet_rsk(req)->opt);
 }
 
-void dccp_syn_ack_timeout(struct sock *sk, struct request_sock *req)
+void dccp_syn_ack_timeout(const struct request_sock *req)
 {
 }
 EXPORT_SYMBOL(dccp_syn_ack_timeout);

net/ipv4/inet_connection_sock.c

@@ -615,7 +615,7 @@ static void reqsk_timer_handler(unsigned long data)
 		max_retries = defer_accept;
 	syn_ack_recalc(req, thresh, max_retries, defer_accept,
 		       &expire, &resend);
-	req->rsk_ops->syn_ack_timeout(sk_listener, req);
+	req->rsk_ops->syn_ack_timeout(req);
 	if (!expire &&
 	    (!resend ||
 	     !inet_rtx_syn_ack(sk_listener, req) ||

net/ipv4/tcp_timer.c

@@ -327,7 +327,7 @@ static void tcp_fastopen_synack_timer(struct sock *sk)
 	struct request_sock *req;
 
 	req = tcp_sk(sk)->fastopen_rsk;
-	req->rsk_ops->syn_ack_timeout(sk, req);
+	req->rsk_ops->syn_ack_timeout(req);
 
 	if (req->num_timeout >= max_retries) {
 		tcp_write_err(sk);
@@ -539,9 +539,11 @@ static void tcp_write_timer(unsigned long data)
 	sock_put(sk);
 }
 
-void tcp_syn_ack_timeout(struct sock *sk, struct request_sock *req)
+void tcp_syn_ack_timeout(const struct request_sock *req)
 {
-	NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPTIMEOUTS);
+	struct net *net = read_pnet(&inet_rsk(req)->ireq_net);
+
+	NET_INC_STATS_BH(net, LINUX_MIB_TCPTIMEOUTS);
 }
 EXPORT_SYMBOL(tcp_syn_ack_timeout);