[ICSK]: Move generalised functions from tcp to inet_connection_sock

This also improves reqsk_queue_prune and renames it to
inet_csk_reqsk_queue_prune, as it deals with both inet_connection_sock
and inet_request_sock objects, not just with request_sock ones thus
belonging to inet_request_sock.

Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

include/net/inet_connection_sock.h

···
 	reqsk_free(req);
 }
 
+extern void inet_csk_reqsk_queue_prune(struct sock *parent,
+				       const unsigned long interval,
+				       const unsigned long timeout,
+				       const unsigned long max_rto);
+
+extern void inet_csk_destroy_sock(struct sock *sk);
+extern int  inet_csk_listen_start(struct sock *sk, const int nr_table_entries);
 extern void inet_csk_listen_stop(struct sock *sk);
 
 #endif /* _INET_CONNECTION_SOCK_H */

include/net/request_sock.h

···
 	write_unlock(&queue->syn_wait_lock);
 }
 
-extern void reqsk_queue_prune(struct request_sock_queue *queue, struct sock *parent,
-			      const unsigned long interval, const unsigned long timeout,
-			      const unsigned long max_rto, int max_retries);
-
 #endif /* _REQUEST_SOCK_H */

include/net/tcp.h

···
 					    size_t len, int nonblock, 
 					    int flags, int *addr_len);
 
-extern int			inet_csk_listen_start(struct sock *sk,
-						      const int nr_table_entries);
-
 extern void			tcp_parse_options(struct sk_buff *skb,
 						  struct tcp_options_received *opt_rx,
 						  int estab);
···
 {
 	tp->snd_wl1 = seq;
 }
-
-extern void inet_csk_destroy_sock(struct sock *sk);
-
 
 /*
  * Calculate(/check) TCP checksum

net/dccp/timer.c

···
  */
 static void dccp_response_timer(struct sock *sk)
 {
-	struct inet_connection_sock *icsk = inet_csk(sk);
-	const int max_retries = icsk->icsk_syn_retries ? : TCP_SYNACK_RETRIES /* FIXME sysctl_tcp_synack_retries */;
-
-	reqsk_queue_prune(&icsk->icsk_accept_queue, sk, TCP_SYNQ_INTERVAL,
-			  DCCP_TIMEOUT_INIT, DCCP_RTO_MAX, max_retries);
+	inet_csk_reqsk_queue_prune(sk, TCP_SYNQ_INTERVAL, DCCP_TIMEOUT_INIT, DCCP_RTO_MAX);
 }
 
 static void dccp_keepalive_timer(unsigned long data)

net/ipv4/inet_connection_sock.c

···
 #include <net/ip.h>
 #include <net/route.h>
 #include <net/tcp_states.h>
+#include <net/xfrm.h>
 
 #ifdef INET_CSK_DEBUG
 const char inet_csk_timer_bug_msg[] = "inet_csk BUG: unknown timer value\n";
···
 	inet_csk_reqsk_queue_added(sk, timeout);
 }
 
+/* Only thing we need from tcp.h */
+extern int sysctl_tcp_synack_retries;
+
 EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_hash_add);
+
+void inet_csk_reqsk_queue_prune(struct sock *parent,
+				const unsigned long interval,
+				const unsigned long timeout,
+				const unsigned long max_rto)
+{
+	struct inet_connection_sock *icsk = inet_csk(parent);
+	struct request_sock_queue *queue = &icsk->icsk_accept_queue;
+	struct listen_sock *lopt = queue->listen_opt;
+	int max_retries = icsk->icsk_syn_retries ? : sysctl_tcp_synack_retries;
+	int thresh = max_retries;
+	unsigned long now = jiffies;
+	struct request_sock **reqp, *req;
+	int i, budget;
+
+	if (lopt == NULL || lopt->qlen == 0)
+		return;
+
+	/* Normally all the openreqs are young and become mature
+	 * (i.e. converted to established socket) for first timeout.
+	 * If synack was not acknowledged for 3 seconds, it means
+	 * one of the following things: synack was lost, ack was lost,
+	 * rtt is high or nobody planned to ack (i.e. synflood).
+	 * When server is a bit loaded, queue is populated with old
+	 * open requests, reducing effective size of queue.
+	 * When server is well loaded, queue size reduces to zero
+	 * after several minutes of work. It is not synflood,
+	 * it is normal operation. The solution is pruning
+	 * too old entries overriding normal timeout, when
+	 * situation becomes dangerous.
+	 *
+	 * Essentially, we reserve half of room for young
+	 * embrions; and abort old ones without pity, if old
+	 * ones are about to clog our table.
+	 */
+	if (lopt->qlen>>(lopt->max_qlen_log-1)) {
+		int young = (lopt->qlen_young<<1);
+
+		while (thresh > 2) {
+			if (lopt->qlen < young)
+				break;
+			thresh--;
+			young <<= 1;
+		}
+	}
+
+	if (queue->rskq_defer_accept)
+		max_retries = queue->rskq_defer_accept;
+
+	budget = 2 * (lopt->nr_table_entries / (timeout / interval));
+	i = lopt->clock_hand;
+
+	do {
+		reqp=&lopt->syn_table[i];
+		while ((req = *reqp) != NULL) {
+			if (time_after_eq(now, req->expires)) {
+				if ((req->retrans < thresh ||
+				     (inet_rsk(req)->acked && req->retrans < max_retries))
+				    && !req->rsk_ops->rtx_syn_ack(parent, req, NULL)) {
+					unsigned long timeo;
+
+					if (req->retrans++ == 0)
+						lopt->qlen_young--;
+					timeo = min((timeout << req->retrans), max_rto);
+					req->expires = now + timeo;
+					reqp = &req->dl_next;
+					continue;
+				}
+
+				/* Drop this request */
+				inet_csk_reqsk_queue_unlink(parent, req, reqp);
+				reqsk_queue_removed(queue, req);
+				reqsk_free(req);
+				continue;
+			}
+			reqp = &req->dl_next;
+		}
+
+		i = (i + 1) & (lopt->nr_table_entries - 1);
+
+	} while (--budget > 0);
+
+	lopt->clock_hand = i;
+
+	if (lopt->qlen)
+		inet_csk_reset_keepalive_timer(parent, interval);
+}
+
+EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_prune);
 
 struct sock *inet_csk_clone(struct sock *sk, const struct request_sock *req,
 			    const unsigned int __nocast priority)
···
 }
 
 EXPORT_SYMBOL_GPL(inet_csk_clone);
+
+/*
+ * At this point, there should be no process reference to this
+ * socket, and thus no user references at all.  Therefore we
+ * can assume the socket waitqueue is inactive and nobody will
+ * try to jump onto it.
+ */
+void inet_csk_destroy_sock(struct sock *sk)
+{
+	BUG_TRAP(sk->sk_state == TCP_CLOSE);
+	BUG_TRAP(sock_flag(sk, SOCK_DEAD));
+
+	/* It cannot be in hash table! */
+	BUG_TRAP(sk_unhashed(sk));
+
+	/* If it has not 0 inet_sk(sk)->num, it must be bound */
+	BUG_TRAP(!inet_sk(sk)->num || inet_csk(sk)->icsk_bind_hash);
+
+	sk->sk_prot->destroy(sk);
+
+	sk_stream_kill_queues(sk);
+
+	xfrm_sk_free_policy(sk);
+
+	sk_refcnt_debug_release(sk);
+
+	atomic_dec(sk->sk_prot->orphan_count);
+	sock_put(sk);
+}
+
+EXPORT_SYMBOL(inet_csk_destroy_sock);
+
+int inet_csk_listen_start(struct sock *sk, const int nr_table_entries)
+{
+	struct inet_sock *inet = inet_sk(sk);
+	struct inet_connection_sock *icsk = inet_csk(sk);
+	int rc = reqsk_queue_alloc(&icsk->icsk_accept_queue, nr_table_entries);
+
+	if (rc != 0)
+		return rc;
+
+	sk->sk_max_ack_backlog = 0;
+	sk->sk_ack_backlog = 0;
+	inet_csk_delack_init(sk);
+
+	/* There is race window here: we announce ourselves listening,
+	 * but this transition is still not validated by get_port().
+	 * It is OK, because this socket enters to hash table only
+	 * after validation is complete.
+	 */
+	sk->sk_state = TCP_LISTEN;
+	if (!sk->sk_prot->get_port(sk, inet->num)) {
+		inet->sport = htons(inet->num);
+
+		sk_dst_reset(sk);
+		sk->sk_prot->hash(sk);
+
+		return 0;
+	}
+
+	sk->sk_state = TCP_CLOSE;
+	__reqsk_queue_destroy(&icsk->icsk_accept_queue);
+	return -EADDRINUSE;
+}
+
+EXPORT_SYMBOL_GPL(inet_csk_listen_start);
+
+/*
+ *	This routine closes sockets which have been at least partially
+ *	opened, but not yet accepted.
+ */
+void inet_csk_listen_stop(struct sock *sk)
+{
+	struct inet_connection_sock *icsk = inet_csk(sk);
+	struct request_sock *acc_req;
+	struct request_sock *req;
+
+	inet_csk_delete_keepalive_timer(sk);
+
+	/* make all the listen_opt local to us */
+	acc_req = reqsk_queue_yank_acceptq(&icsk->icsk_accept_queue);
+
+	/* Following specs, it would be better either to send FIN
+	 * (and enter FIN-WAIT-1, it is normal close)
+	 * or to send active reset (abort).
+	 * Certainly, it is pretty dangerous while synflood, but it is
+	 * bad justification for our negligence 8)
+	 * To be honest, we are not able to make either
+	 * of the variants now.			--ANK
+	 */
+	reqsk_queue_destroy(&icsk->icsk_accept_queue);
+
+	while ((req = acc_req) != NULL) {
+		struct sock *child = req->sk;
+
+		acc_req = req->dl_next;
+
+		local_bh_disable();
+		bh_lock_sock(child);
+		BUG_TRAP(!sock_owned_by_user(child));
+		sock_hold(child);
+
+		sk->sk_prot->disconnect(child, O_NONBLOCK);
+
+		sock_orphan(child);
+
+		atomic_inc(sk->sk_prot->orphan_count);
+
+		inet_csk_destroy_sock(child);
+
+		bh_unlock_sock(child);
+		local_bh_enable();
+		sock_put(child);
+
+		sk_acceptq_removed(sk);
+		__reqsk_free(req);
+	}
+	BUG_TRAP(!sk->sk_ack_backlog);
+}
+
+EXPORT_SYMBOL_GPL(inet_csk_listen_stop);

net/ipv4/tcp.c

···
 	return put_user(answ, (int __user *)arg);
 }
 
-int inet_csk_listen_start(struct sock *sk, const int nr_table_entries)
-{
-	struct inet_sock *inet = inet_sk(sk);
-	struct inet_connection_sock *icsk = inet_csk(sk);
-	int rc = reqsk_queue_alloc(&icsk->icsk_accept_queue, nr_table_entries);
-
-	if (rc != 0)
-		return rc;
-
-	sk->sk_max_ack_backlog = 0;
-	sk->sk_ack_backlog = 0;
-	inet_csk_delack_init(sk);
-
-	/* There is race window here: we announce ourselves listening,
-	 * but this transition is still not validated by get_port().
-	 * It is OK, because this socket enters to hash table only
-	 * after validation is complete.
-	 */
-	sk->sk_state = TCP_LISTEN;
-	if (!sk->sk_prot->get_port(sk, inet->num)) {
-		inet->sport = htons(inet->num);
-
-		sk_dst_reset(sk);
-		sk->sk_prot->hash(sk);
-
-		return 0;
-	}
-
-	sk->sk_state = TCP_CLOSE;
-	__reqsk_queue_destroy(&icsk->icsk_accept_queue);
-	return -EADDRINUSE;
-}
-
-EXPORT_SYMBOL_GPL(inet_csk_listen_start);
-
-/*
- *	This routine closes sockets which have been at least partially
- *	opened, but not yet accepted.
- */
-void inet_csk_listen_stop(struct sock *sk)
-{
-	struct inet_connection_sock *icsk = inet_csk(sk);
-	struct request_sock *acc_req;
-	struct request_sock *req;
-
-	inet_csk_delete_keepalive_timer(sk);
-
-	/* make all the listen_opt local to us */
-	acc_req = reqsk_queue_yank_acceptq(&icsk->icsk_accept_queue);
-
-	/* Following specs, it would be better either to send FIN
-	 * (and enter FIN-WAIT-1, it is normal close)
-	 * or to send active reset (abort).
-	 * Certainly, it is pretty dangerous while synflood, but it is
-	 * bad justification for our negligence 8)
-	 * To be honest, we are not able to make either
-	 * of the variants now.			--ANK
-	 */
-	reqsk_queue_destroy(&icsk->icsk_accept_queue);
-
-	while ((req = acc_req) != NULL) {
-		struct sock *child = req->sk;
-
-		acc_req = req->dl_next;
-
-		local_bh_disable();
-		bh_lock_sock(child);
-		BUG_TRAP(!sock_owned_by_user(child));
-		sock_hold(child);
-
-		sk->sk_prot->disconnect(child, O_NONBLOCK);
-
-		sock_orphan(child);
-
-		atomic_inc(sk->sk_prot->orphan_count);
-
-		inet_csk_destroy_sock(child);
-
-		bh_unlock_sock(child);
-		local_bh_enable();
-		sock_put(child);
-
-		sk_acceptq_removed(sk);
-		__reqsk_free(req);
-	}
-	BUG_TRAP(!sk->sk_ack_backlog);
-}
-
-EXPORT_SYMBOL_GPL(inet_csk_listen_stop);
-
 static inline void tcp_mark_push(struct tcp_sock *tp, struct sk_buff *skb)
 {
 	TCP_SKB_CB(skb)->flags |= TCPCB_FLAG_PSH;
···
 	}
 }
 
-/*
- * At this point, there should be no process reference to this
- * socket, and thus no user references at all.  Therefore we
- * can assume the socket waitqueue is inactive and nobody will
- * try to jump onto it.
- */
-void inet_csk_destroy_sock(struct sock *sk)
-{
-	BUG_TRAP(sk->sk_state == TCP_CLOSE);
-	BUG_TRAP(sock_flag(sk, SOCK_DEAD));
-
-	/* It cannot be in hash table! */
-	BUG_TRAP(sk_unhashed(sk));
-
-	/* If it has not 0 inet_sk(sk)->num, it must be bound */
-	BUG_TRAP(!inet_sk(sk)->num || inet_csk(sk)->icsk_bind_hash);
-
-	sk->sk_prot->destroy(sk);
-
-	sk_stream_kill_queues(sk);
-
-	xfrm_sk_free_policy(sk);
-
-	sk_refcnt_debug_release(sk);
-
-	atomic_dec(sk->sk_prot->orphan_count);
-	sock_put(sk);
-}
-
 void tcp_close(struct sock *sk, long timeout)
 {
 	struct sk_buff *skb;
···
 }
 
 EXPORT_SYMBOL(tcp_close);
-EXPORT_SYMBOL(inet_csk_destroy_sock);
 EXPORT_SYMBOL(tcp_disconnect);
 EXPORT_SYMBOL(tcp_getsockopt);
 EXPORT_SYMBOL(tcp_ioctl);

net/ipv4/tcp_timer.c

···
 	sock_put(sk);
 }
 
-void reqsk_queue_prune(struct request_sock_queue *queue, struct sock *parent,
-		       const unsigned long interval, const unsigned long timeout,
-		       const unsigned long max_rto, int max_retries)
-{
-	struct inet_connection_sock *icsk = inet_csk(parent);
-	struct listen_sock *lopt = queue->listen_opt;
-	int thresh = max_retries;
-	unsigned long now = jiffies;
-	struct request_sock **reqp, *req;
-	int i, budget;
-
-	if (lopt == NULL || lopt->qlen == 0)
-		return;
-
-	/* Normally all the openreqs are young and become mature
-	 * (i.e. converted to established socket) for first timeout.
-	 * If synack was not acknowledged for 3 seconds, it means
-	 * one of the following things: synack was lost, ack was lost,
-	 * rtt is high or nobody planned to ack (i.e. synflood).
-	 * When server is a bit loaded, queue is populated with old
-	 * open requests, reducing effective size of queue.
-	 * When server is well loaded, queue size reduces to zero
-	 * after several minutes of work. It is not synflood,
-	 * it is normal operation. The solution is pruning
-	 * too old entries overriding normal timeout, when
-	 * situation becomes dangerous.
-	 *
-	 * Essentially, we reserve half of room for young
-	 * embrions; and abort old ones without pity, if old
-	 * ones are about to clog our table.
-	 */
-	if (lopt->qlen>>(lopt->max_qlen_log-1)) {
-		int young = (lopt->qlen_young<<1);
-
-		while (thresh > 2) {
-			if (lopt->qlen < young)
-				break;
-			thresh--;
-			young <<= 1;
-		}
-	}
-
-	if (queue->rskq_defer_accept)
-		max_retries = queue->rskq_defer_accept;
-
-	budget = 2 * (lopt->nr_table_entries / (timeout / interval));
-	i = lopt->clock_hand;
-
-	do {
-		reqp=&lopt->syn_table[i];
-		while ((req = *reqp) != NULL) {
-			if (time_after_eq(now, req->expires)) {
-				if ((req->retrans < thresh ||
-				     (inet_rsk(req)->acked && req->retrans < max_retries))
-				    && !req->rsk_ops->rtx_syn_ack(parent, req, NULL)) {
-					unsigned long timeo;
-
-					if (req->retrans++ == 0)
-						lopt->qlen_young--;
-					timeo = min((timeout << req->retrans), max_rto);
-					req->expires = now + timeo;
-					reqp = &req->dl_next;
-					continue;
-				}
-
-				/* Drop this request */
-				inet_csk_reqsk_queue_unlink(parent, req, reqp);
-				reqsk_queue_removed(&icsk->icsk_accept_queue, req);
-				reqsk_free(req);
-				continue;
-			}
-			reqp = &req->dl_next;
-		}
-
-		i = (i + 1) & (lopt->nr_table_entries - 1);
-
-	} while (--budget > 0);
-
-	lopt->clock_hand = i;
-
-	if (lopt->qlen)
-		inet_csk_reset_keepalive_timer(parent, interval);
-}
-
-EXPORT_SYMBOL_GPL(reqsk_queue_prune);
-
 /*
  *	Timer for listening sockets
  */
 
 static void tcp_synack_timer(struct sock *sk)
 {
-	struct inet_connection_sock *icsk = inet_csk(sk);
-	const int max_retries = icsk->icsk_syn_retries ? : sysctl_tcp_synack_retries;
-
-	reqsk_queue_prune(&icsk->icsk_accept_queue, sk, TCP_SYNQ_INTERVAL,
-			  TCP_TIMEOUT_INIT, TCP_RTO_MAX, max_retries);
+	inet_csk_reqsk_queue_prune(sk, TCP_SYNQ_INTERVAL,
+				   TCP_TIMEOUT_INIT, TCP_RTO_MAX);
 }
 
 void tcp_set_keepalive(struct sock *sk, int val)