20 files changed, 307 insertions, 746 deletions

diff --git a/include/net/inet6_connection_sock.h b/include/net/inet6_connection_sock.h
index 79b2a4c09ca6..064cfbe639d0 100644
--- a/include/net/inet6_connection_sock.h
+++ b/include/net/inet6_connection_sock.h
@@ -28,15 +28,6 @@ int inet6_csk_bind_conflict(const struct sock *sk,
 struct dst_entry *inet6_csk_route_req(const struct sock *sk, struct flowi6 *fl6,
 				      const struct request_sock *req, u8 proto);
 
-struct request_sock *inet6_csk_search_req(struct sock *sk,
-					  const __be16 rport,
-					  const struct in6_addr *raddr,
-					  const struct in6_addr *laddr,
-					  const int iif);
-
-void inet6_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req,
-				    const unsigned long timeout);
-
 void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr);
 
 int inet6_csk_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl);
diff --git a/include/net/inet_connection_sock.h b/include/net/inet_connection_sock.h
index ee54f21a8113..3208a65d1c28 100644
--- a/include/net/inet_connection_sock.h
+++ b/include/net/inet_connection_sock.h
@@ -258,10 +258,6 @@ inet_csk_rto_backoff(const struct inet_connection_sock *icsk,
 
 struct sock *inet_csk_accept(struct sock *sk, int flags, int *err);
 
-struct request_sock *inet_csk_search_req(struct sock *sk,
-					 const __be16 rport,
-					 const __be32 raddr,
-					 const __be32 laddr);
 int inet_csk_bind_conflict(const struct sock *sk,
 			   const struct inet_bind_bucket *tb, bool relax);
 int inet_csk_get_port(struct sock *sk, unsigned short snum);
@@ -282,8 +278,7 @@ static inline void inet_csk_reqsk_queue_add(struct sock *sk,
 void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req,
 				   unsigned long timeout);
 
-static inline void inet_csk_reqsk_queue_added(struct sock *sk,
-					      const unsigned long timeout)
+static inline void inet_csk_reqsk_queue_added(struct sock *sk)
 {
 	reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue);
 }
@@ -300,7 +295,7 @@ static inline int inet_csk_reqsk_queue_young(const struct sock *sk)
 
 static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk)
 {
-	return reqsk_queue_is_full(&inet_csk(sk)->icsk_accept_queue);
+	return inet_csk_reqsk_queue_len(sk) >= sk->sk_max_ack_backlog;
 }
 
 void inet_csk_reqsk_queue_drop(struct sock *sk, struct request_sock *req);
diff --git a/include/net/inet_hashtables.h b/include/net/inet_hashtables.h
index 3fb778d7c875..6683ada25fef 100644
--- a/include/net/inet_hashtables.h
+++ b/include/net/inet_hashtables.h
@@ -205,6 +205,7 @@ void inet_put_port(struct sock *sk);
 
 void inet_hashinfo_init(struct inet_hashinfo *h);
 
+int inet_ehash_insert(struct sock *sk, struct sock *osk);
 void __inet_hash_nolisten(struct sock *sk, struct sock *osk);
 void __inet_hash(struct sock *sk, struct sock *osk);
 void inet_hash(struct sock *sk);
diff --git a/include/net/request_sock.h b/include/net/request_sock.h
index d2544de329bd..bae6936d75c4 100644
--- a/include/net/request_sock.h
+++ b/include/net/request_sock.h
@@ -69,6 +69,16 @@ struct request_sock {
 	u32				peer_secid;
 };
 
+static inline struct request_sock *inet_reqsk(struct sock *sk)
+{
+	return (struct request_sock *)sk;
+}
+
+static inline struct sock *req_to_sk(struct request_sock *req)
+{
+	return (struct sock *)req;
+}
+
 static inline struct request_sock *
 reqsk_alloc(const struct request_sock_ops *ops, struct sock *sk_listener)
 {
@@ -78,6 +88,8 @@ reqsk_alloc(const struct request_sock_ops *ops, struct sock *sk_listener)
 		req->rsk_ops = ops;
 		sock_hold(sk_listener);
 		req->rsk_listener = sk_listener;
+		req_to_sk(req)->sk_prot = sk_listener->sk_prot;
+		sk_node_init(&req_to_sk(req)->sk_node);
 		req->saved_syn = NULL;
 		/* Following is temporary. It is coupled with debugging
 		 * helpers in reqsk_put() & reqsk_free()
@@ -87,16 +99,6 @@ reqsk_alloc(const struct request_sock_ops *ops, struct sock *sk_listener)
 	return req;
 }
 
-static inline struct request_sock *inet_reqsk(struct sock *sk)
-{
-	return (struct request_sock *)sk;
-}
-
-static inline struct sock *req_to_sk(struct request_sock *req)
-{
-	return (struct sock *)req;
-}
-
 static inline void reqsk_free(struct request_sock *req)
 {
 	/* temporary debugging */
@@ -117,25 +119,6 @@ static inline void reqsk_put(struct request_sock *req)
 
 extern int sysctl_max_syn_backlog;
 
-/** struct listen_sock - listen state
- *
- * @max_qlen_log - log_2 of maximal queued SYNs/REQUESTs
- */
-struct listen_sock {
-	int			qlen_inc; /* protected by listener lock */
-	int			young_inc;/* protected by listener lock */
-
-	/* following fields can be updated by timer */
-	atomic_t		qlen_dec; /* qlen = qlen_inc - qlen_dec */
-	atomic_t		young_dec;
-
-	u32			max_qlen_log ____cacheline_aligned_in_smp;
-	u32			synflood_warned;
-	u32			hash_rnd;
-	u32			nr_table_entries;
-	struct request_sock	*syn_table[0];
-};
-
 /*
  * For a TCP Fast Open listener -
  *	lock - protects the access to all the reqsk, which is co-owned by
@@ -169,43 +152,29 @@ struct fastopen_queue {
  * @rskq_accept_head - FIFO head of established children
  * @rskq_accept_tail - FIFO tail of established children
  * @rskq_defer_accept - User waits for some data after accept()
- * @syn_wait_lock - serializer
- *
- * %syn_wait_lock is necessary only to avoid proc interface having to grab the main
- * lock sock while browsing the listening hash (otherwise it's deadlock prone).
  *
  */
 struct request_sock_queue {
+	spinlock_t		rskq_lock;
+	u8			rskq_defer_accept;
+
+	u32			synflood_warned;
+	atomic_t		qlen;
+	atomic_t		young;
+
 	struct request_sock	*rskq_accept_head;
 	struct request_sock	*rskq_accept_tail;
-	u8			rskq_defer_accept;
-	struct listen_sock	*listen_opt;
 	struct fastopen_queue	fastopenq;  /* Check max_qlen != 0 to determine
 					     * if TFO is enabled.
 					     */
-
-	/* temporary alignment, our goal is to get rid of this lock */
-	spinlock_t		syn_wait_lock ____cacheline_aligned_in_smp;
 };
 
-int reqsk_queue_alloc(struct request_sock_queue *queue,
-		      unsigned int nr_table_entries);
+void reqsk_queue_alloc(struct request_sock_queue *queue);
 
-void __reqsk_queue_destroy(struct request_sock_queue *queue);
-void reqsk_queue_destroy(struct request_sock_queue *queue);
 void reqsk_fastopen_remove(struct sock *sk, struct request_sock *req,
 			   bool reset);
 
-static inline struct request_sock *
-	reqsk_queue_yank_acceptq(struct request_sock_queue *queue)
-{
-	struct request_sock *req = queue->rskq_accept_head;
-
-	queue->rskq_accept_head = NULL;
-	return req;
-}
-
-static inline int reqsk_queue_empty(struct request_sock_queue *queue)
+static inline bool reqsk_queue_empty(const struct request_sock_queue *queue)
 {
 	return queue->rskq_accept_head == NULL;
 }
@@ -215,6 +184,7 @@ static inline void reqsk_queue_add(struct request_sock_queue *queue,
 				   struct sock *parent,
 				   struct sock *child)
 {
+	spin_lock(&queue->rskq_lock);
 	req->sk = child;
 	sk_acceptq_added(parent);
 
@@ -225,68 +195,48 @@ static inline void reqsk_queue_add(struct request_sock_queue *queue,
 
 	queue->rskq_accept_tail = req;
 	req->dl_next = NULL;
+	spin_unlock(&queue->rskq_lock);
 }
 
-static inline struct request_sock *reqsk_queue_remove(struct request_sock_queue *queue)
+static inline struct request_sock *reqsk_queue_remove(struct request_sock_queue *queue,
+						      struct sock *parent)
 {
-	struct request_sock *req = queue->rskq_accept_head;
-
-	WARN_ON(req == NULL);
-
-	queue->rskq_accept_head = req->dl_next;
-	if (queue->rskq_accept_head == NULL)
-		queue->rskq_accept_tail = NULL;
+	struct request_sock *req;
 
+	spin_lock_bh(&queue->rskq_lock);
+	req = queue->rskq_accept_head;
+	if (req) {
+		sk_acceptq_removed(parent);
+		queue->rskq_accept_head = req->dl_next;
+		if (queue->rskq_accept_head == NULL)
+			queue->rskq_accept_tail = NULL;
+	}
+	spin_unlock_bh(&queue->rskq_lock);
 	return req;
 }
 
 static inline void reqsk_queue_removed(struct request_sock_queue *queue,
 				       const struct request_sock *req)
 {
-	struct listen_sock *lopt = queue->listen_opt;
-
 	if (req->num_timeout == 0)
-		atomic_inc(&lopt->young_dec);
-	atomic_inc(&lopt->qlen_dec);
+		atomic_dec(&queue->young);
+	atomic_dec(&queue->qlen);
 }
 
 static inline void reqsk_queue_added(struct request_sock_queue *queue)
 {
-	struct listen_sock *lopt = queue->listen_opt;
-
-	lopt->young_inc++;
-	lopt->qlen_inc++;
-}
-
-static inline int listen_sock_qlen(const struct listen_sock *lopt)
-{
-	return lopt->qlen_inc - atomic_read(&lopt->qlen_dec);
-}
-
-static inline int listen_sock_young(const struct listen_sock *lopt)
-{
-	return lopt->young_inc - atomic_read(&lopt->young_dec);
+	atomic_inc(&queue->young);
+	atomic_inc(&queue->qlen);
 }
 
 static inline int reqsk_queue_len(const struct request_sock_queue *queue)
 {
-	const struct listen_sock *lopt = queue->listen_opt;
-
-	return lopt ? listen_sock_qlen(lopt) : 0;
+	return atomic_read(&queue->qlen);
 }
 
 static inline int reqsk_queue_len_young(const struct request_sock_queue *queue)
 {
-	return listen_sock_young(queue->listen_opt);
+	return atomic_read(&queue->young);
 }
 
-static inline int reqsk_queue_is_full(const struct request_sock_queue *queue)
-{
-	return reqsk_queue_len(queue) >> queue->listen_opt->max_qlen_log;
-}
-
-void reqsk_queue_hash_req(struct request_sock_queue *queue,
-			  u32 hash, struct request_sock *req,
-			  unsigned long timeout);
-
 #endif /* _REQUEST_SOCK_H */
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 2c7dfe52f473..a6be56d5f0e3 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -462,7 +462,8 @@ int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
 int tcp_connect(struct sock *sk);
 struct sk_buff *tcp_make_synack(const struct sock *sk, struct dst_entry *dst,
 				struct request_sock *req,
-				struct tcp_fastopen_cookie *foc);
+				struct tcp_fastopen_cookie *foc,
+				bool attach_req);
 int tcp_disconnect(struct sock *sk, int flags);
 
 void tcp_finish_connect(struct sock *sk, struct sk_buff *skb);
@@ -1618,7 +1619,6 @@ static inline bool tcp_stream_is_thin(struct tcp_sock *tp)
 /* /proc */
 enum tcp_seq_states {
 	TCP_SEQ_STATE_LISTENING,
-	TCP_SEQ_STATE_OPENREQ,
 	TCP_SEQ_STATE_ESTABLISHED,
 };
 
@@ -1637,7 +1637,6 @@ struct tcp_iter_state {
 	enum tcp_seq_states	state;
 	struct sock		*syn_wait_sk;
 	int			bucket, offset, sbucket, num;
-	kuid_t			uid;
 	loff_t			last_pos;
 };
 
@@ -1717,9 +1716,8 @@ struct tcp_request_sock_ops {
 	__u32 (*init_seq)(const struct sk_buff *skb);
 	int (*send_synack)(const struct sock *sk, struct dst_entry *dst,
 			   struct flowi *fl, struct request_sock *req,
-			   u16 queue_mapping, struct tcp_fastopen_cookie *foc);
-	void (*queue_hash_add)(struct sock *sk, struct request_sock *req,
-			       const unsigned long timeout);
+			   u16 queue_mapping, struct tcp_fastopen_cookie *foc,
+			   bool attach_req);
 };
 
 #ifdef CONFIG_SYN_COOKIES
diff --git a/net/core/request_sock.c b/net/core/request_sock.c
index e22cfa4ed25f..15c853806518 100644
--- a/net/core/request_sock.c
+++ b/net/core/request_sock.c
@@ -37,28 +37,9 @@
 int sysctl_max_syn_backlog = 256;
 EXPORT_SYMBOL(sysctl_max_syn_backlog);
 
-int reqsk_queue_alloc(struct request_sock_queue *queue,
-		      unsigned int nr_table_entries)
+void reqsk_queue_alloc(struct request_sock_queue *queue)
 {
-	size_t lopt_size = sizeof(struct listen_sock);
-	struct listen_sock *lopt = NULL;
-
-	nr_table_entries = min_t(u32, nr_table_entries, sysctl_max_syn_backlog);
-	nr_table_entries = max_t(u32, nr_table_entries, 8);
-	nr_table_entries = roundup_pow_of_two(nr_table_entries + 1);
-	lopt_size += nr_table_entries * sizeof(struct request_sock *);
-
-	if (lopt_size <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER))
-		lopt = kzalloc(lopt_size, GFP_KERNEL |
-					  __GFP_NOWARN |
-					  __GFP_NORETRY);
-	if (!lopt)
-		lopt = vzalloc(lopt_size);
-	if (!lopt)
-		return -ENOMEM;
-
-	get_random_bytes(&lopt->hash_rnd, sizeof(lopt->hash_rnd));
-	spin_lock_init(&queue->syn_wait_lock);
+	spin_lock_init(&queue->rskq_lock);
 
 	spin_lock_init(&queue->fastopenq.lock);
 	queue->fastopenq.rskq_rst_head = NULL;
@@ -67,67 +48,6 @@ int reqsk_queue_alloc(struct request_sock_queue *queue,
 	queue->fastopenq.max_qlen = 0;
 
 	queue->rskq_accept_head = NULL;
-	lopt->nr_table_entries = nr_table_entries;
-	lopt->max_qlen_log = ilog2(nr_table_entries);
-
-	spin_lock_bh(&queue->syn_wait_lock);
-	queue->listen_opt = lopt;
-	spin_unlock_bh(&queue->syn_wait_lock);
-
-	return 0;
-}
-
-void __reqsk_queue_destroy(struct request_sock_queue *queue)
-{
-	/* This is an error recovery path only, no locking needed */
-	kvfree(queue->listen_opt);
-}
-
-static inline struct listen_sock *reqsk_queue_yank_listen_sk(
-		struct request_sock_queue *queue)
-{
-	struct listen_sock *lopt;
-
-	spin_lock_bh(&queue->syn_wait_lock);
-	lopt = queue->listen_opt;
-	queue->listen_opt = NULL;
-	spin_unlock_bh(&queue->syn_wait_lock);
-
-	return lopt;
-}
-
-void reqsk_queue_destroy(struct request_sock_queue *queue)
-{
-	/* make all the listen_opt local to us */
-	struct listen_sock *lopt = reqsk_queue_yank_listen_sk(queue);
-
-	if (listen_sock_qlen(lopt) != 0) {
-		unsigned int i;
-
-		for (i = 0; i < lopt->nr_table_entries; i++) {
-			struct request_sock *req;
-
-			spin_lock_bh(&queue->syn_wait_lock);
-			while ((req = lopt->syn_table[i]) != NULL) {
-				lopt->syn_table[i] = req->dl_next;
-				/* Because of following del_timer_sync(),
-				 * we must release the spinlock here
-				 * or risk a dead lock.
-				 */
-				spin_unlock_bh(&queue->syn_wait_lock);
-				atomic_inc(&lopt->qlen_dec);
-				if (del_timer_sync(&req->rsk_timer))
-					reqsk_put(req);
-				reqsk_put(req);
-				spin_lock_bh(&queue->syn_wait_lock);
-			}
-			spin_unlock_bh(&queue->syn_wait_lock);
-		}
-	}
-
-	if (WARN_ON(listen_sock_qlen(lopt) != 0))
-		pr_err("qlen %u\n", listen_sock_qlen(lopt));
-	kvfree(lopt);
 }
 
 /*
diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c
index 5b7818c63cec..8910c9567719 100644
--- a/net/dccp/ipv4.c
+++ b/net/dccp/ipv4.c
@@ -444,36 +444,6 @@ put_and_exit:
 }
 EXPORT_SYMBOL_GPL(dccp_v4_request_recv_sock);
 
-static struct sock *dccp_v4_hnd_req(struct sock *sk, struct sk_buff *skb)
-{
-	const struct dccp_hdr *dh = dccp_hdr(skb);
-	const struct iphdr *iph = ip_hdr(skb);
-	struct sock *nsk;
-	/* Find possible connection requests. */
-	struct request_sock *req = inet_csk_search_req(sk, dh->dccph_sport,
-						       iph->saddr, iph->daddr);
-	if (req) {
-		nsk = dccp_check_req(sk, skb, req);
-		if (!nsk)
-			reqsk_put(req);
-		return nsk;
-	}
-	nsk = inet_lookup_established(sock_net(sk), &dccp_hashinfo,
-				      iph->saddr, dh->dccph_sport,
-				      iph->daddr, dh->dccph_dport,
-				      inet_iif(skb));
-	if (nsk != NULL) {
-		if (nsk->sk_state != DCCP_TIME_WAIT) {
-			bh_lock_sock(nsk);
-			return nsk;
-		}
-		inet_twsk_put(inet_twsk(nsk));
-		return NULL;
-	}
-
-	return sk;
-}
-
 static struct dst_entry* dccp_v4_route_skb(struct net *net, struct sock *sk,
 					   struct sk_buff *skb)
 {
@@ -705,18 +675,6 @@ int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
 	 * NOTE: the check for the packet types is done in
 	 *	 dccp_rcv_state_process
 	 */
-	if (sk->sk_state == DCCP_LISTEN) {
-		struct sock *nsk = dccp_v4_hnd_req(sk, skb);
-
-		if (nsk == NULL)
-			goto discard;
-
-		if (nsk != sk) {
-			if (dccp_child_process(sk, nsk, skb))
-				goto reset;
-			return 0;
-		}
-	}
 
 	if (dccp_rcv_state_process(sk, skb, dh, skb->len))
 		goto reset;
@@ -724,7 +682,6 @@ int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
 
 reset:
 	dccp_v4_ctl_send_reset(sk, skb);
-discard:
 	kfree_skb(skb);
 	return 0;
 }
@@ -868,6 +825,27 @@ static int dccp_v4_rcv(struct sk_buff *skb)
 		goto no_dccp_socket;
 	}
 
+	if (sk->sk_state == DCCP_NEW_SYN_RECV) {
+		struct request_sock *req = inet_reqsk(sk);
+		struct sock *nsk = NULL;
+
+		sk = req->rsk_listener;
+		if (sk->sk_state == DCCP_LISTEN)
+			nsk = dccp_check_req(sk, skb, req);
+		if (!nsk) {
+			reqsk_put(req);
+			goto discard_it;
+		}
+		if (nsk == sk) {
+			sock_hold(sk);
+			reqsk_put(req);
+		} else if (dccp_child_process(sk, nsk, skb)) {
+			dccp_v4_ctl_send_reset(sk, skb);
+			goto discard_it;
+		} else {
+			return 0;
+		}
+	}
 	/*
 	 * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
 	 *	o if MinCsCov = 0, only packets with CsCov = 0 are accepted
diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c
index e8753aa3b7a4..1361a3f45df7 100644
--- a/net/dccp/ipv6.c
+++ b/net/dccp/ipv6.c
@@ -290,37 +290,6 @@ static struct request_sock_ops dccp6_request_sock_ops = {
 	.syn_ack_timeout = dccp_syn_ack_timeout,
 };
 
-static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
-{
-	const struct dccp_hdr *dh = dccp_hdr(skb);
-	const struct ipv6hdr *iph = ipv6_hdr(skb);
-	struct request_sock *req;
-	struct sock *nsk;
-
-	req = inet6_csk_search_req(sk, dh->dccph_sport, &iph->saddr,
-				   &iph->daddr, inet6_iif(skb));
-	if (req) {
-		nsk = dccp_check_req(sk, skb, req);
-		if (!nsk)
-			reqsk_put(req);
-		return nsk;
-	}
-	nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
-					 &iph->saddr, dh->dccph_sport,
-					 &iph->daddr, ntohs(dh->dccph_dport),
-					 inet6_iif(skb));
-	if (nsk != NULL) {
-		if (nsk->sk_state != DCCP_TIME_WAIT) {
-			bh_lock_sock(nsk);
-			return nsk;
-		}
-		inet_twsk_put(inet_twsk(nsk));
-		return NULL;
-	}
-
-	return sk;
-}
-
 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 {
 	struct request_sock *req;
@@ -398,7 +367,7 @@ static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 	if (dccp_v6_send_response(sk, req))
 		goto drop_and_free;
 
-	inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
+	inet_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
 	return 0;
 
 drop_and_free:
@@ -641,24 +610,6 @@ static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
 	 * NOTE: the check for the packet types is done in
 	 *	 dccp_rcv_state_process
 	 */
-	if (sk->sk_state == DCCP_LISTEN) {
-		struct sock *nsk = dccp_v6_hnd_req(sk, skb);
-
-		if (nsk == NULL)
-			goto discard;
-		/*
-		 * Queue it on the new socket if the new socket is active,
-		 * otherwise we just shortcircuit this and continue with
-		 * the new socket..
-		 */
-		if (nsk != sk) {
-			if (dccp_child_process(sk, nsk, skb))
-				goto reset;
-			if (opt_skb != NULL)
-				__kfree_skb(opt_skb);
-			return 0;
-		}
-	}
 
 	if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
 		goto reset;
@@ -732,6 +683,27 @@ static int dccp_v6_rcv(struct sk_buff *skb)
 		goto no_dccp_socket;
 	}
 
+	if (sk->sk_state == DCCP_NEW_SYN_RECV) {
+		struct request_sock *req = inet_reqsk(sk);
+		struct sock *nsk = NULL;
+
+		sk = req->rsk_listener;
+		if (sk->sk_state == DCCP_LISTEN)
+			nsk = dccp_check_req(sk, skb, req);
+		if (!nsk) {
+			reqsk_put(req);
+			goto discard_it;
+		}
+		if (nsk == sk) {
+			sock_hold(sk);
+			reqsk_put(req);
+		} else if (dccp_child_process(sk, nsk, skb)) {
+			dccp_v6_ctl_send_reset(sk, skb);
+			goto discard_it;
+		} else {
+			return 0;
+		}
+	}
 	/*
 	 * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
 	 *	o if MinCsCov = 0, only packets with CsCov = 0 are accepted
diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index e1527882a578..89eedfbd4ad5 100644
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -330,10 +330,9 @@ struct sock *inet_csk_accept(struct sock *sk, int flags, int *err)
 		if (error)
 			goto out_err;
 	}
-	req = reqsk_queue_remove(queue);
+	req = reqsk_queue_remove(queue, sk);
 	newsk = req->sk;
 
-	sk_acceptq_removed(sk);
 	if (sk->sk_protocol == IPPROTO_TCP &&
 	    tcp_rsk(req)->tfo_listener) {
 		spin_lock_bh(&queue->fastopenq.lock);
@@ -477,65 +476,12 @@ no_route:
 }
 EXPORT_SYMBOL_GPL(inet_csk_route_child_sock);
 
-static inline u32 inet_synq_hash(const __be32 raddr, const __be16 rport,
-				 const u32 rnd, const u32 synq_hsize)
-{
-	return jhash_2words((__force u32)raddr, (__force u32)rport, rnd) & (synq_hsize - 1);
-}
-
 #if IS_ENABLED(CONFIG_IPV6)
 #define AF_INET_FAMILY(fam) ((fam) == AF_INET)
 #else
 #define AF_INET_FAMILY(fam) true
 #endif
 
-/* Note: this is temporary :
- * req sock will no longer be in listener hash table
-*/
-struct request_sock *inet_csk_search_req(struct sock *sk,
-					 const __be16 rport,
-					 const __be32 raddr,
-					 const __be32 laddr)
-{
-	struct inet_connection_sock *icsk = inet_csk(sk);
-	struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
-	struct request_sock *req;
-	u32 hash = inet_synq_hash(raddr, rport, lopt->hash_rnd,
-				  lopt->nr_table_entries);
-
-	spin_lock(&icsk->icsk_accept_queue.syn_wait_lock);
-	for (req = lopt->syn_table[hash]; req != NULL; req = req->dl_next) {
-		const struct inet_request_sock *ireq = inet_rsk(req);
-
-		if (ireq->ir_rmt_port == rport &&
-		    ireq->ir_rmt_addr == raddr &&
-		    ireq->ir_loc_addr == laddr &&
-		    AF_INET_FAMILY(req->rsk_ops->family)) {
-			atomic_inc(&req->rsk_refcnt);
-			WARN_ON(req->sk);
-			break;
-		}
-	}
-	spin_unlock(&icsk->icsk_accept_queue.syn_wait_lock);
-
-	return req;
-}
-EXPORT_SYMBOL_GPL(inet_csk_search_req);
-
-void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req,
-				   unsigned long timeout)
-{
-	struct inet_connection_sock *icsk = inet_csk(sk);
-	struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
-	const u32 h = inet_synq_hash(inet_rsk(req)->ir_rmt_addr,
-				     inet_rsk(req)->ir_rmt_port,
-				     lopt->hash_rnd, lopt->nr_table_entries);
-
-	reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout);
-	inet_csk_reqsk_queue_added(sk, timeout);
-}
-EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_hash_add);
-
 /* Only thing we need from tcp.h */
 extern int sysctl_tcp_synack_retries;
 
@@ -572,26 +518,20 @@ int inet_rtx_syn_ack(const struct sock *parent, struct request_sock *req)
 }
 EXPORT_SYMBOL(inet_rtx_syn_ack);
 
-/* return true if req was found in the syn_table[] */
+/* return true if req was found in the ehash table */
 static bool reqsk_queue_unlink(struct request_sock_queue *queue,
 			       struct request_sock *req)
 {
-	struct listen_sock *lopt = queue->listen_opt;
-	struct request_sock **prev;
-	bool found = false;
+	struct inet_hashinfo *hashinfo = req_to_sk(req)->sk_prot->h.hashinfo;
+	spinlock_t *lock;
+	bool found;
 
-	spin_lock(&queue->syn_wait_lock);
+	lock = inet_ehash_lockp(hashinfo, req->rsk_hash);
 
-	for (prev = &lopt->syn_table[req->rsk_hash]; *prev != NULL;
-	     prev = &(*prev)->dl_next) {
-		if (*prev == req) {
-			*prev = req->dl_next;
-			found = true;
-			break;
-		}
-	}
+	spin_lock(lock);
+	found = __sk_nulls_del_node_init_rcu(req_to_sk(req));
+	spin_unlock(lock);
 
-	spin_unlock(&queue->syn_wait_lock);
 	if (timer_pending(&req->rsk_timer) && del_timer_sync(&req->rsk_timer))
 		reqsk_put(req);
 	return found;
@@ -612,15 +552,12 @@ static void reqsk_timer_handler(unsigned long data)
 	struct sock *sk_listener = req->rsk_listener;
 	struct inet_connection_sock *icsk = inet_csk(sk_listener);
 	struct request_sock_queue *queue = &icsk->icsk_accept_queue;
-	struct listen_sock *lopt = queue->listen_opt;
 	int qlen, expire = 0, resend = 0;
 	int max_retries, thresh;
 	u8 defer_accept;
 
-	if (sk_listener->sk_state != TCP_LISTEN || !lopt) {
-		reqsk_put(req);
-		return;
-	}
+	if (sk_listener->sk_state != TCP_LISTEN)
+		goto drop;
 
 	max_retries = icsk->icsk_syn_retries ? : sysctl_tcp_synack_retries;
 	thresh = max_retries;
@@ -641,9 +578,9 @@ static void reqsk_timer_handler(unsigned long data)
 	 * embrions; and abort old ones without pity, if old
 	 * ones are about to clog our table.
 	 */
-	qlen = listen_sock_qlen(lopt);
-	if (qlen >> (lopt->max_qlen_log - 1)) {
-		int young = listen_sock_young(lopt) << 1;
+	qlen = reqsk_queue_len(queue);
+	if ((qlen << 1) > sk_listener->sk_max_ack_backlog) {
+		int young = reqsk_queue_len_young(queue) << 1;
 
 		while (thresh > 2) {
 			if (qlen < young)
@@ -665,41 +602,41 @@ static void reqsk_timer_handler(unsigned long data)
 		unsigned long timeo;
 
 		if (req->num_timeout++ == 0)
-			atomic_inc(&lopt->young_dec);
+			atomic_dec(&queue->young);
 		timeo = min(TCP_TIMEOUT_INIT << req->num_timeout, TCP_RTO_MAX);
 		mod_timer_pinned(&req->rsk_timer, jiffies + timeo);
 		return;
 	}
+drop:
 	inet_csk_reqsk_queue_drop(sk_listener, req);
 	reqsk_put(req);
 }
 
-void reqsk_queue_hash_req(struct request_sock_queue *queue,
-			  u32 hash, struct request_sock *req,
-			  unsigned long timeout)
+static void reqsk_queue_hash_req(struct request_sock *req,
+				 unsigned long timeout)
 {
-	struct listen_sock *lopt = queue->listen_opt;
-
 	req->num_retrans = 0;
 	req->num_timeout = 0;
 	req->sk = NULL;
 
 	setup_timer(&req->rsk_timer, reqsk_timer_handler, (unsigned long)req);
 	mod_timer_pinned(&req->rsk_timer, jiffies + timeout);
-	req->rsk_hash = hash;
 
+	inet_ehash_insert(req_to_sk(req), NULL);
 	/* before letting lookups find us, make sure all req fields
 	 * are committed to memory and refcnt initialized.
 	 */
 	smp_wmb();
-	atomic_set(&req->rsk_refcnt, 2);
+	atomic_set(&req->rsk_refcnt, 2 + 1);
+}
 
-	spin_lock(&queue->syn_wait_lock);
-	req->dl_next = lopt->syn_table[hash];
-	lopt->syn_table[hash] = req;
-	spin_unlock(&queue->syn_wait_lock);
+void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req,
+				   unsigned long timeout)
+{
+	reqsk_queue_hash_req(req, timeout);
+	inet_csk_reqsk_queue_added(sk);
 }
-EXPORT_SYMBOL(reqsk_queue_hash_req);
+EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_hash_add);
 
 /**
  *	inet_csk_clone_lock - clone an inet socket, and lock its clone
@@ -792,12 +729,10 @@ EXPORT_SYMBOL(inet_csk_prepare_forced_close);
 
 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);
+	struct inet_sock *inet = inet_sk(sk);
 
-	if (rc != 0)
-		return rc;
+	reqsk_queue_alloc(&icsk->icsk_accept_queue);
 
 	sk->sk_max_ack_backlog = 0;
 	sk->sk_ack_backlog = 0;
@@ -819,7 +754,6 @@ int inet_csk_listen_start(struct sock *sk, const int nr_table_entries)
 	}
 
 	sk->sk_state = TCP_CLOSE;
-	__reqsk_queue_destroy(&icsk->icsk_accept_queue);
 	return -EADDRINUSE;
 }
 EXPORT_SYMBOL_GPL(inet_csk_listen_start);
@@ -832,11 +766,7 @@ void inet_csk_listen_stop(struct sock *sk)
 {
 	struct inet_connection_sock *icsk = inet_csk(sk);
 	struct request_sock_queue *queue = &icsk->icsk_accept_queue;
-	struct request_sock *acc_req;
-	struct request_sock *req;
-
-	/* make all the listen_opt local to us */
-	acc_req = reqsk_queue_yank_acceptq(queue);
+	struct request_sock *next, *req;
 
 	/* Following specs, it would be better either to send FIN
 	 * (and enter FIN-WAIT-1, it is normal close)
@@ -846,13 +776,9 @@ void inet_csk_listen_stop(struct sock *sk)
 	 * To be honest, we are not able to make either
 	 * of the variants now.			--ANK
 	 */
-	reqsk_queue_destroy(queue);
-
-	while ((req = acc_req) != NULL) {
+	while ((req = reqsk_queue_remove(queue, sk)) != NULL) {
 		struct sock *child = req->sk;
 
-		acc_req = req->dl_next;
-
 		local_bh_disable();
 		bh_lock_sock(child);
 		WARN_ON(sock_owned_by_user(child));
@@ -882,18 +808,19 @@ void inet_csk_listen_stop(struct sock *sk)
 		local_bh_enable();
 		sock_put(child);
 
-		sk_acceptq_removed(sk);
 		reqsk_put(req);
+		cond_resched();
 	}
 	if (queue->fastopenq.rskq_rst_head) {
 		/* Free all the reqs queued in rskq_rst_head. */
 		spin_lock_bh(&queue->fastopenq.lock);
-		acc_req = queue->fastopenq.rskq_rst_head;
+		req = queue->fastopenq.rskq_rst_head;
 		queue->fastopenq.rskq_rst_head = NULL;
 		spin_unlock_bh(&queue->fastopenq.lock);
-		while ((req = acc_req) != NULL) {
-			acc_req = req->dl_next;
+		while (req != NULL) {
+			next = req->dl_next;
 			reqsk_put(req);
+			req = next;
 		}
 	}
 	WARN_ON(sk->sk_ack_backlog);
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index c3b1f3a0f4cf..ab9f8a66615d 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -730,91 +730,21 @@ static void twsk_build_assert(void)
 #endif
 }
 
-static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
-			       struct netlink_callback *cb,
-			       const struct inet_diag_req_v2 *r,
-			       const struct nlattr *bc)
-{
-	struct inet_connection_sock *icsk = inet_csk(sk);
-	struct inet_sock *inet = inet_sk(sk);
-	struct inet_diag_entry entry;
-	int j, s_j, reqnum, s_reqnum;
-	struct listen_sock *lopt;
-	int err = 0;
-
-	s_j = cb->args[3];
-	s_reqnum = cb->args[4];
-
-	if (s_j > 0)
-		s_j--;
-
-	entry.family = sk->sk_family;
-
-	spin_lock(&icsk->icsk_accept_queue.syn_wait_lock);
-
-	lopt = icsk->icsk_accept_queue.listen_opt;
-	if (!lopt || !listen_sock_qlen(lopt))
-		goto out;
-
-	if (bc) {
-		entry.sport = inet->inet_num;
-		entry.userlocks = sk->sk_userlocks;
-	}
-
-	for (j = s_j; j < lopt->nr_table_entries; j++) {
-		struct request_sock *req, *head = lopt->syn_table[j];
-
-		reqnum = 0;
-		for (req = head; req; reqnum++, req = req->dl_next) {
-			struct inet_request_sock *ireq = inet_rsk(req);
-
-			if (reqnum < s_reqnum)
-				continue;
-			if (r->id.idiag_dport != ireq->ir_rmt_port &&
-			    r->id.idiag_dport)
-				continue;
-
-			if (bc) {
-				/* Note: entry.sport and entry.userlocks are already set */
-				entry_fill_addrs(&entry, req_to_sk(req));
-				entry.dport = ntohs(ireq->ir_rmt_port);
-
-				if (!inet_diag_bc_run(bc, &entry))
-					continue;
-			}
-
-			err = inet_req_diag_fill(req_to_sk(req), skb,
-						 NETLINK_CB(cb->skb).portid,
-						 cb->nlh->nlmsg_seq,
-						 NLM_F_MULTI, cb->nlh);
-			if (err < 0) {
-				cb->args[3] = j + 1;
-				cb->args[4] = reqnum;
-				goto out;
-			}
-		}
-
-		s_reqnum = 0;
-	}
-
-out:
-	spin_unlock(&icsk->icsk_accept_queue.syn_wait_lock);
-
-	return err;
-}
-
 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
 			 struct netlink_callback *cb,
 			 const struct inet_diag_req_v2 *r, struct nlattr *bc)
 {
 	struct net *net = sock_net(skb->sk);
 	int i, num, s_i, s_num;
+	u32 idiag_states = r->idiag_states;
 
+	if (idiag_states & TCPF_SYN_RECV)
+		idiag_states |= TCPF_NEW_SYN_RECV;
 	s_i = cb->args[1];
 	s_num = num = cb->args[2];
 
 	if (cb->args[0] == 0) {
-		if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
+		if (!(idiag_states & TCPF_LISTEN))
 			goto skip_listen_ht;
 
 		for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
@@ -844,21 +774,11 @@ void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
 				    r->id.idiag_sport)
 					goto next_listen;
 
-				if (!(r->idiag_states & TCPF_LISTEN) ||
-				    r->id.idiag_dport ||
+				if (r->id.idiag_dport ||
 				    cb->args[3] > 0)
-					goto syn_recv;
-
-				if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
-					spin_unlock_bh(&ilb->lock);
-					goto done;
-				}
-
-syn_recv:
-				if (!(r->idiag_states & TCPF_SYN_RECV))
 					goto next_listen;
 
-				if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) {
+				if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
 					spin_unlock_bh(&ilb->lock);
 					goto done;
 				}
@@ -879,7 +799,7 @@ skip_listen_ht:
 		s_i = num = s_num = 0;
 	}
 
-	if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
+	if (!(idiag_states & ~TCPF_LISTEN))
 		goto out;
 
 	for (i = s_i; i <= hashinfo->ehash_mask; i++) {
@@ -906,7 +826,7 @@ skip_listen_ht:
 				goto next_normal;
 			state = (sk->sk_state == TCP_TIME_WAIT) ?
 				inet_twsk(sk)->tw_substate : sk->sk_state;
-			if (!(r->idiag_states & (1 << state)))
+			if (!(idiag_states & (1 << state)))
 				goto next_normal;
 			if (r->sdiag_family != AF_UNSPEC &&
 			    sk->sk_family != r->sdiag_family)
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index 56742e995dd3..bed8886a4b6c 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -398,14 +398,18 @@ static u32 inet_sk_port_offset(const struct sock *sk)
 					  inet->inet_dport);
 }
 
-void __inet_hash_nolisten(struct sock *sk, struct sock *osk)
+/* insert a socket into ehash, and eventually remove another one
+ * (The another one can be a SYN_RECV or TIMEWAIT
+ */
+int inet_ehash_insert(struct sock *sk, struct sock *osk)
 {
 	struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
 	struct hlist_nulls_head *list;
 	struct inet_ehash_bucket *head;
 	spinlock_t *lock;
+	int ret = 0;
 
-	WARN_ON(!sk_unhashed(sk));
+	WARN_ON_ONCE(!sk_unhashed(sk));
 
 	sk->sk_hash = sk_ehashfn(sk);
 	head = inet_ehash_bucket(hashinfo, sk->sk_hash);
@@ -419,6 +423,12 @@ void __inet_hash_nolisten(struct sock *sk, struct sock *osk)
 		sk_nulls_del_node_init_rcu(osk);
 	}
 	spin_unlock(lock);
+	return ret;
+}
+
+void __inet_hash_nolisten(struct sock *sk, struct sock *osk)
+{
+	inet_ehash_insert(sk, osk);
 	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
 }
 EXPORT_SYMBOL_GPL(__inet_hash_nolisten);
diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c
index 6b97b5f6457c..729ceb5f63c6 100644
--- a/net/ipv4/syncookies.c
+++ b/net/ipv4/syncookies.c
@@ -284,6 +284,10 @@ bool cookie_ecn_ok(const struct tcp_options_received *tcp_opt,
 }
 EXPORT_SYMBOL(cookie_ecn_ok);
 
+/* On input, sk is a listener.
+ * Output is listener if incoming packet would not create a child
+ *           NULL if memory could not be allocated.
+ */
 struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb)
 {
 	struct ip_options *opt = &TCP_SKB_CB(skb)->header.h4.opt;
diff --git a/net/ipv4/tcp_fastopen.c b/net/ipv4/tcp_fastopen.c
index f69f436fcbcc..410ac481fda0 100644
--- a/net/ipv4/tcp_fastopen.c
+++ b/net/ipv4/tcp_fastopen.c
@@ -161,13 +161,13 @@ static struct sock *tcp_fastopen_create_child(struct sock *sk,
 	tp->snd_wnd = ntohs(tcp_hdr(skb)->window);
 
 	/* Activate the retrans timer so that SYNACK can be retransmitted.
-	 * The request socket is not added to the SYN table of the parent
+	 * The request socket is not added to the ehash
 	 * because it's been added to the accept queue directly.
 	 */
 	inet_csk_reset_xmit_timer(child, ICSK_TIME_RETRANS,
 				  TCP_TIMEOUT_INIT, TCP_RTO_MAX);
 
-	atomic_set(&req->rsk_refcnt, 1);
+	atomic_set(&req->rsk_refcnt, 2);
 	/* Add the child socket directly into the accept queue */
 	inet_csk_reqsk_queue_add(sk, req, child);
 
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index e58cbcd2f07e..27108757c310 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -6068,9 +6068,9 @@ static bool tcp_syn_flood_action(const struct sock *sk,
 				 const struct sk_buff *skb,
 				 const char *proto)
 {
+	struct request_sock_queue *queue = &inet_csk(sk)->icsk_accept_queue;
 	const char *msg = "Dropping request";
 	bool want_cookie = false;
-	struct listen_sock *lopt;
 
 #ifdef CONFIG_SYN_COOKIES
 	if (sysctl_tcp_syncookies) {
@@ -6081,10 +6081,9 @@ static bool tcp_syn_flood_action(const struct sock *sk,
 #endif
 		NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPREQQFULLDROP);
 
-	lopt = inet_csk(sk)->icsk_accept_queue.listen_opt;
-	if (!lopt->synflood_warned &&
+	if (!queue->synflood_warned &&
 	    sysctl_tcp_syncookies != 2 &&
-	    xchg(&lopt->synflood_warned, 1) == 0)
+	    xchg(&queue->synflood_warned, 1) == 0)
 		pr_info("%s: Possible SYN flooding on port %d. %s.  Check SNMP counters.\n",
 			proto, ntohs(tcp_hdr(skb)->dest), msg);
 
@@ -6121,8 +6120,6 @@ int tcp_conn_request(struct request_sock_ops *rsk_ops,
 	struct request_sock *req;
 	bool want_cookie = false;
 	struct flowi fl;
-	int err;
-
 
 	/* TW buckets are converted to open requests without
 	 * limitations, they conserve resources and peer is
@@ -6231,21 +6228,24 @@ int tcp_conn_request(struct request_sock_ops *rsk_ops,
 	tcp_rsk(req)->snt_isn = isn;
 	tcp_rsk(req)->txhash = net_tx_rndhash();
 	tcp_openreq_init_rwin(req, sk, dst);
-	if (!want_cookie)
+	if (!want_cookie) {
 		fastopen_sk = tcp_try_fastopen(sk, skb, req, &foc, dst);
-	err = af_ops->send_synack(fastopen_sk ?: sk, dst, &fl, req,
-				  skb_get_queue_mapping(skb), &foc);
+		tcp_reqsk_record_syn(sk, req, skb);
+	}
 	if (fastopen_sk) {
+		af_ops->send_synack(fastopen_sk, dst, &fl, req,
+				    skb_get_queue_mapping(skb), &foc, false);
 		sock_put(fastopen_sk);
 	} else {
-		if (err || want_cookie)
-			goto drop_and_free;
-
 		tcp_rsk(req)->tfo_listener = false;
-		af_ops->queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
+		if (!want_cookie)
+			inet_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
+		af_ops->send_synack(sk, dst, &fl, req,
+				    skb_get_queue_mapping(skb), &foc, !want_cookie);
+		if (want_cookie)
+			goto drop_and_free;
 	}
-	tcp_reqsk_record_syn(sk, req, skb);
-
+	reqsk_put(req);
 	return 0;
 
 drop_and_release:
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 64ece718d66c..34310748a365 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -822,7 +822,8 @@ static int tcp_v4_send_synack(const struct sock *sk, struct dst_entry *dst,
 			      struct flowi *fl,
 			      struct request_sock *req,
 			      u16 queue_mapping,
-			      struct tcp_fastopen_cookie *foc)
+			      struct tcp_fastopen_cookie *foc,
+				  bool attach_req)
 {
 	const struct inet_request_sock *ireq = inet_rsk(req);
 	struct flowi4 fl4;
@@ -833,7 +834,7 @@ static int tcp_v4_send_synack(const struct sock *sk, struct dst_entry *dst,
 	if (!dst && (dst = inet_csk_route_req(sk, &fl4, req)) == NULL)
 		return -1;
 
-	skb = tcp_make_synack(sk, dst, req, foc);
+	skb = tcp_make_synack(sk, dst, req, foc, attach_req);
 
 	if (skb) {
 		__tcp_v4_send_check(skb, ireq->ir_loc_addr, ireq->ir_rmt_addr);
@@ -1112,10 +1113,13 @@ clear_hash_noput:
 }
 EXPORT_SYMBOL(tcp_v4_md5_hash_skb);
 
+#endif
+
 /* Called with rcu_read_lock() */
-static bool tcp_v4_inbound_md5_hash(struct sock *sk,
+static bool tcp_v4_inbound_md5_hash(const struct sock *sk,
 				    const struct sk_buff *skb)
 {
+#ifdef CONFIG_TCP_MD5SIG
 	/*
 	 * This gets called for each TCP segment that arrives
 	 * so we want to be efficient.
@@ -1165,8 +1169,9 @@ static bool tcp_v4_inbound_md5_hash(struct sock *sk,
 		return true;
 	}
 	return false;
-}
 #endif
+	return false;
+}
 
 static void tcp_v4_init_req(struct request_sock *req,
 			    const struct sock *sk_listener,
@@ -1220,7 +1225,6 @@ static const struct tcp_request_sock_ops tcp_request_sock_ipv4_ops = {
 	.route_req	=	tcp_v4_route_req,
 	.init_seq	=	tcp_v4_init_sequence,
 	.send_synack	=	tcp_v4_send_synack,
-	.queue_hash_add =	inet_csk_reqsk_queue_hash_add,
 };
 
 int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
@@ -1339,34 +1343,11 @@ put_and_exit:
 }
 EXPORT_SYMBOL(tcp_v4_syn_recv_sock);
 
-static struct sock *tcp_v4_hnd_req(struct sock *sk, struct sk_buff *skb)
+static struct sock *tcp_v4_cookie_check(struct sock *sk, struct sk_buff *skb)
 {
+#ifdef CONFIG_SYN_COOKIES
 	const struct tcphdr *th = tcp_hdr(skb);
-	const struct iphdr *iph = ip_hdr(skb);
-	struct request_sock *req;
-	struct sock *nsk;
-
-	req = inet_csk_search_req(sk, th->source, iph->saddr, iph->daddr);
-	if (req) {
-		nsk = tcp_check_req(sk, skb, req, false);
-		if (!nsk || nsk == sk)
-			reqsk_put(req);
-		return nsk;
-	}
-
-	nsk = inet_lookup_established(sock_net(sk), &tcp_hashinfo, iph->saddr,
-			th->source, iph->daddr, th->dest, inet_iif(skb));
-
-	if (nsk) {
-		if (nsk->sk_state != TCP_TIME_WAIT) {
-			bh_lock_sock(nsk);
-			return nsk;
-		}
-		inet_twsk_put(inet_twsk(nsk));
-		return NULL;
-	}
 
-#ifdef CONFIG_SYN_COOKIES
 	if (!th->syn)
 		sk = cookie_v4_check(sk, skb);
 #endif
@@ -1374,7 +1355,7 @@ static struct sock *tcp_v4_hnd_req(struct sock *sk, struct sk_buff *skb)
 }
 
 /* The socket must have it's spinlock held when we get
- * here.
+ * here, unless it is a TCP_LISTEN socket.
  *
  * We have a potential double-lock case here, so even when
  * doing backlog processing we use the BH locking scheme.
@@ -1405,13 +1386,13 @@ int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
 		goto csum_err;
 
 	if (sk->sk_state == TCP_LISTEN) {
-		struct sock *nsk = tcp_v4_hnd_req(sk, skb);
+		struct sock *nsk = tcp_v4_cookie_check(sk, skb);
+
 		if (!nsk)
 			goto discard;
-
 		if (nsk != sk) {
 			sock_rps_save_rxhash(nsk, skb);
-			sk_mark_napi_id(sk, skb);
+			sk_mark_napi_id(nsk, skb);
 			if (tcp_child_process(sk, nsk, skb)) {
 				rsk = nsk;
 				goto reset;
@@ -1599,6 +1580,29 @@ process:
 	if (sk->sk_state == TCP_TIME_WAIT)
 		goto do_time_wait;
 
+	if (sk->sk_state == TCP_NEW_SYN_RECV) {
+		struct request_sock *req = inet_reqsk(sk);
+		struct sock *nsk = NULL;
+
+		sk = req->rsk_listener;
+		if (tcp_v4_inbound_md5_hash(sk, skb))
+			goto discard_and_relse;
+		if (sk->sk_state == TCP_LISTEN)
+			nsk = tcp_check_req(sk, skb, req, false);
+		if (!nsk) {
+			reqsk_put(req);
+			goto discard_it;
+		}
+		if (nsk == sk) {
+			sock_hold(sk);
+			reqsk_put(req);
+		} else if (tcp_child_process(sk, nsk, skb)) {
+			tcp_v4_send_reset(nsk, skb);
+			goto discard_it;
+		} else {
+			return 0;
+		}
+	}
 	if (unlikely(iph->ttl < inet_sk(sk)->min_ttl)) {
 		NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP);
 		goto discard_and_relse;
@@ -1607,25 +1611,23 @@ process:
 	if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb))
 		goto discard_and_relse;
 
-#ifdef CONFIG_TCP_MD5SIG
-	/*
-	 * We really want to reject the packet as early as possible
-	 * if:
-	 *  o We're expecting an MD5'd packet and this is no MD5 tcp option
-	 *  o There is an MD5 option and we're not expecting one
-	 */
 	if (tcp_v4_inbound_md5_hash(sk, skb))
 		goto discard_and_relse;
-#endif
 
 	nf_reset(skb);
 
 	if (sk_filter(sk, skb))
 		goto discard_and_relse;
 
-	sk_incoming_cpu_update(sk);
 	skb->dev = NULL;
 
+	if (sk->sk_state == TCP_LISTEN) {
+		ret = tcp_v4_do_rcv(sk, skb);
+		goto put_and_return;
+	}
+
+	sk_incoming_cpu_update(sk);
+
 	bh_lock_sock_nested(sk);
 	tcp_sk(sk)->segs_in += max_t(u16, 1, skb_shinfo(skb)->gso_segs);
 	ret = 0;
@@ -1640,6 +1642,7 @@ process:
 	}
 	bh_unlock_sock(sk);
 
+put_and_return:
 	sock_put(sk);
 
 	return ret;
@@ -1834,35 +1837,7 @@ static void *listening_get_next(struct seq_file *seq, void *cur)
 	++st->num;
 	++st->offset;
 
-	if (st->state == TCP_SEQ_STATE_OPENREQ) {
-		struct request_sock *req = cur;
-
-		icsk = inet_csk(st->syn_wait_sk);
-		req = req->dl_next;
-		while (1) {
-			while (req) {
-				if (req->rsk_ops->family == st->family) {
-					cur = req;
-					goto out;
-				}
-				req = req->dl_next;
-			}
-			if (++st->sbucket >= icsk->icsk_accept_queue.listen_opt->nr_table_entries)
-				break;
-get_req:
-			req = icsk->icsk_accept_queue.listen_opt->syn_table[st->sbucket];
-		}
-		sk	  = sk_nulls_next(st->syn_wait_sk);
-		st->state = TCP_SEQ_STATE_LISTENING;
-		spin_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
-	} else {
-		icsk = inet_csk(sk);
-		spin_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
-		if (reqsk_queue_len(&icsk->icsk_accept_queue))
-			goto start_req;
-		spin_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
-		sk = sk_nulls_next(sk);
-	}
+	sk = sk_nulls_next(sk);
 get_sk:
 	sk_nulls_for_each_from(sk, node) {
 		if (!net_eq(sock_net(sk), net))
@@ -1872,16 +1847,6 @@ get_sk:
 			goto out;
 		}
 		icsk = inet_csk(sk);
-		spin_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
-		if (reqsk_queue_len(&icsk->icsk_accept_queue)) {
-start_req:
-			st->uid		= sock_i_uid(sk);
-			st->syn_wait_sk = sk;
-			st->state	= TCP_SEQ_STATE_OPENREQ;
-			st->sbucket	= 0;
-			goto get_req;
-		}
-		spin_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 	}
 	spin_unlock_bh(&ilb->lock);
 	st->offset = 0;
@@ -2013,7 +1978,6 @@ static void *tcp_seek_last_pos(struct seq_file *seq)
 	void *rc = NULL;
 
 	switch (st->state) {
-	case TCP_SEQ_STATE_OPENREQ:
 	case TCP_SEQ_STATE_LISTENING:
 		if (st->bucket >= INET_LHTABLE_SIZE)
 			break;
@@ -2072,7 +2036,6 @@ static void *tcp_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 	}
 
 	switch (st->state) {
-	case TCP_SEQ_STATE_OPENREQ:
 	case TCP_SEQ_STATE_LISTENING:
 		rc = listening_get_next(seq, v);
 		if (!rc) {
@@ -2097,11 +2060,6 @@ static void tcp_seq_stop(struct seq_file *seq, void *v)
 	struct tcp_iter_state *st = seq->private;
 
 	switch (st->state) {
-	case TCP_SEQ_STATE_OPENREQ:
-		if (v) {
-			struct inet_connection_sock *icsk = inet_csk(st->syn_wait_sk);
-			spin_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
-		}
 	case TCP_SEQ_STATE_LISTENING:
 		if (v != SEQ_START_TOKEN)
 			spin_unlock_bh(&tcp_hashinfo.listening_hash[st->bucket].lock);
@@ -2155,7 +2113,7 @@ void tcp_proc_unregister(struct net *net, struct tcp_seq_afinfo *afinfo)
 EXPORT_SYMBOL(tcp_proc_unregister);
 
 static void get_openreq4(const struct request_sock *req,
-			 struct seq_file *f, int i, kuid_t uid)
+			 struct seq_file *f, int i)
 {
 	const struct inet_request_sock *ireq = inet_rsk(req);
 	long delta = req->rsk_timer.expires - jiffies;
@@ -2172,7 +2130,8 @@ static void get_openreq4(const struct request_sock *req,
 		1,    /* timers active (only the expire timer) */
 		jiffies_delta_to_clock_t(delta),
 		req->num_timeout,
-		from_kuid_munged(seq_user_ns(f), uid),
+		from_kuid_munged(seq_user_ns(f),
+				 sock_i_uid(req->rsk_listener)),
 		0,  /* non standard timer */
 		0, /* open_requests have no inode */
 		0,
@@ -2273,18 +2232,12 @@ static int tcp4_seq_show(struct seq_file *seq, void *v)
 	}
 	st = seq->private;
 
-	switch (st->state) {
-	case TCP_SEQ_STATE_LISTENING:
-	case TCP_SEQ_STATE_ESTABLISHED:
-		if (sk->sk_state == TCP_TIME_WAIT)
-			get_timewait4_sock(v, seq, st->num);
-		else
-			get_tcp4_sock(v, seq, st->num);
-		break;
-	case TCP_SEQ_STATE_OPENREQ:
-		get_openreq4(v, seq, st->num, st->uid);
-		break;
-	}
+	if (sk->sk_state == TCP_TIME_WAIT)
+		get_timewait4_sock(v, seq, st->num);
+	else if (sk->sk_state == TCP_NEW_SYN_RECV)
+		get_openreq4(v, seq, st->num);
+	else
+		get_tcp4_sock(v, seq, st->num);
 out:
 	seq_pad(seq, '\n');
 	return 0;
diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index 897e34273ba3..9adf1e2c3170 100644
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -578,8 +578,6 @@ struct sock *tcp_check_req(struct sock *sk, struct sk_buff *skb,
 	__be32 flg = tcp_flag_word(th) & (TCP_FLAG_RST|TCP_FLAG_SYN|TCP_FLAG_ACK);
 	bool paws_reject = false;
 
-	BUG_ON(fastopen == (sk->sk_state == TCP_LISTEN));
-
 	tmp_opt.saw_tstamp = 0;
 	if (th->doff > (sizeof(struct tcphdr)>>2)) {
 		tcp_parse_options(skb, &tmp_opt, 0, NULL);
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 09bb082ca1a7..55ed3266b05f 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -2947,7 +2947,8 @@ int tcp_send_synack(struct sock *sk)
  */
 struct sk_buff *tcp_make_synack(const struct sock *sk, struct dst_entry *dst,
 				struct request_sock *req,
-				struct tcp_fastopen_cookie *foc)
+				struct tcp_fastopen_cookie *foc,
+				bool attach_req)
 {
 	struct inet_request_sock *ireq = inet_rsk(req);
 	const struct tcp_sock *tp = tcp_sk(sk);
@@ -2959,11 +2960,7 @@ struct sk_buff *tcp_make_synack(const struct sock *sk, struct dst_entry *dst,
 	u16 user_mss;
 	int mss;
 
-	/* sk is a const pointer, because we want to express multiple cpus
-	 * might call us concurrently.
-	 * sock_wmalloc() will change sk->sk_wmem_alloc in an atomic way.
-	 */
-	skb = sock_wmalloc((struct sock *)sk, MAX_TCP_HEADER, 1, GFP_ATOMIC);
+	skb = alloc_skb(MAX_TCP_HEADER, GFP_ATOMIC);
 	if (unlikely(!skb)) {
 		dst_release(dst);
 		return NULL;
@@ -2971,6 +2968,17 @@ struct sk_buff *tcp_make_synack(const struct sock *sk, struct dst_entry *dst,
 	/* Reserve space for headers. */
 	skb_reserve(skb, MAX_TCP_HEADER);
 
+	if (attach_req) {
+		skb->destructor = sock_edemux;
+		sock_hold(req_to_sk(req));
+		skb->sk = req_to_sk(req);
+	} else {
+		/* sk is a const pointer, because we want to express multiple
+		 * cpu might call us concurrently.
+		 * sk->sk_wmem_alloc in an atomic, we can promote to rw.
+		 */
+		skb_set_owner_w(skb, (struct sock *)sk);
+	}
 	skb_dst_set(skb, dst);
 
 	mss = dst_metric_advmss(dst);
@@ -3510,7 +3518,7 @@ int tcp_rtx_synack(const struct sock *sk, struct request_sock *req)
 	int res;
 
 	tcp_rsk(req)->txhash = net_tx_rndhash();
-	res = af_ops->send_synack(sk, NULL, &fl, req, 0, NULL);
+	res = af_ops->send_synack(sk, NULL, &fl, req, 0, NULL, true);
 	if (!res) {
 		TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS);
 		NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPSYNRETRANS);
diff --git a/net/ipv6/inet6_connection_sock.c b/net/ipv6/inet6_connection_sock.c
index 163bfef3e5db..5d1c7cee2cb2 100644
--- a/net/ipv6/inet6_connection_sock.c
+++ b/net/ipv6/inet6_connection_sock.c
@@ -94,73 +94,6 @@ struct dst_entry *inet6_csk_route_req(const struct sock *sk,
 }
 EXPORT_SYMBOL(inet6_csk_route_req);
 
-/*
- * request_sock (formerly open request) hash tables.
- */
-static u32 inet6_synq_hash(const struct in6_addr *raddr, const __be16 rport,
-			   const u32 rnd, const u32 synq_hsize)
-{
-	u32 c;
-
-	c = jhash_3words((__force u32)raddr->s6_addr32[0],
-			 (__force u32)raddr->s6_addr32[1],
-			 (__force u32)raddr->s6_addr32[2],
-			 rnd);
-
-	c = jhash_2words((__force u32)raddr->s6_addr32[3],
-			 (__force u32)rport,
-			 c);
-
-	return c & (synq_hsize - 1);
-}
-
-struct request_sock *inet6_csk_search_req(struct sock *sk,
-					  const __be16 rport,
-					  const struct in6_addr *raddr,
-					  const struct in6_addr *laddr,
-					  const int iif)
-{
-	struct inet_connection_sock *icsk = inet_csk(sk);
-	struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
-	struct request_sock *req;
-	u32 hash = inet6_synq_hash(raddr, rport, lopt->hash_rnd,
-				   lopt->nr_table_entries);
-
-	spin_lock(&icsk->icsk_accept_queue.syn_wait_lock);
-	for (req = lopt->syn_table[hash]; req != NULL; req = req->dl_next) {
-		const struct inet_request_sock *ireq = inet_rsk(req);
-
-		if (ireq->ir_rmt_port == rport &&
-		    req->rsk_ops->family == AF_INET6 &&
-		    ipv6_addr_equal(&ireq->ir_v6_rmt_addr, raddr) &&
-		    ipv6_addr_equal(&ireq->ir_v6_loc_addr, laddr) &&
-		    (!ireq->ir_iif || ireq->ir_iif == iif)) {
-			atomic_inc(&req->rsk_refcnt);
-			WARN_ON(req->sk != NULL);
-			break;
-		}
-	}
-	spin_unlock(&icsk->icsk_accept_queue.syn_wait_lock);
-
-	return req;
-}
-EXPORT_SYMBOL_GPL(inet6_csk_search_req);
-
-void inet6_csk_reqsk_queue_hash_add(struct sock *sk,
-				    struct request_sock *req,
-				    const unsigned long timeout)
-{
-	struct inet_connection_sock *icsk = inet_csk(sk);
-	struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
-	const u32 h = inet6_synq_hash(&inet_rsk(req)->ir_v6_rmt_addr,
-				      inet_rsk(req)->ir_rmt_port,
-				      lopt->hash_rnd, lopt->nr_table_entries);
-
-	reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout);
-	inet_csk_reqsk_queue_added(sk, timeout);
-}
-EXPORT_SYMBOL_GPL(inet6_csk_reqsk_queue_hash_add);
-
 void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr)
 {
 	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr;
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 2ae95e1d03e1..33334f0c217d 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -438,7 +438,8 @@ static int tcp_v6_send_synack(const struct sock *sk, struct dst_entry *dst,
 			      struct flowi *fl,
 			      struct request_sock *req,
 			      u16 queue_mapping,
-			      struct tcp_fastopen_cookie *foc)
+			      struct tcp_fastopen_cookie *foc,
+			      bool attach_req)
 {
 	struct inet_request_sock *ireq = inet_rsk(req);
 	struct ipv6_pinfo *np = inet6_sk(sk);
@@ -451,7 +452,7 @@ static int tcp_v6_send_synack(const struct sock *sk, struct dst_entry *dst,
 					       IPPROTO_TCP)) == NULL)
 		goto done;
 
-	skb = tcp_make_synack(sk, dst, req, foc);
+	skb = tcp_make_synack(sk, dst, req, foc, attach_req);
 
 	if (skb) {
 		__tcp_v6_send_check(skb, &ireq->ir_v6_loc_addr,
@@ -622,8 +623,12 @@ clear_hash_noput:
 	return 1;
 }
 
-static bool tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb)
+#endif
+
+static bool tcp_v6_inbound_md5_hash(const struct sock *sk,
+				    const struct sk_buff *skb)
 {
+#ifdef CONFIG_TCP_MD5SIG
 	const __u8 *hash_location = NULL;
 	struct tcp_md5sig_key *hash_expected;
 	const struct ipv6hdr *ip6h = ipv6_hdr(skb);
@@ -660,9 +665,9 @@ static bool tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb)
 				     &ip6h->daddr, ntohs(th->dest));
 		return true;
 	}
+#endif
 	return false;
 }
-#endif
 
 static void tcp_v6_init_req(struct request_sock *req,
 			    const struct sock *sk_listener,
@@ -723,7 +728,6 @@ static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
 	.route_req	=	tcp_v6_route_req,
 	.init_seq	=	tcp_v6_init_sequence,
 	.send_synack	=	tcp_v6_send_synack,
-	.queue_hash_add =	inet6_csk_reqsk_queue_hash_add,
 };
 
 static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32 seq,
@@ -934,37 +938,11 @@ static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
 }
 
 
-static struct sock *tcp_v6_hnd_req(struct sock *sk, struct sk_buff *skb)
+static struct sock *tcp_v6_cookie_check(struct sock *sk, struct sk_buff *skb)
 {
+#ifdef CONFIG_SYN_COOKIES
 	const struct tcphdr *th = tcp_hdr(skb);
-	struct request_sock *req;
-	struct sock *nsk;
-
-	/* Find possible connection requests. */
-	req = inet6_csk_search_req(sk, th->source,
-				   &ipv6_hdr(skb)->saddr,
-				   &ipv6_hdr(skb)->daddr, tcp_v6_iif(skb));
-	if (req) {
-		nsk = tcp_check_req(sk, skb, req, false);
-		if (!nsk || nsk == sk)
-			reqsk_put(req);
-		return nsk;
-	}
-	nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo,
-					 &ipv6_hdr(skb)->saddr, th->source,
-					 &ipv6_hdr(skb)->daddr, ntohs(th->dest),
-					 tcp_v6_iif(skb));
-
-	if (nsk) {
-		if (nsk->sk_state != TCP_TIME_WAIT) {
-			bh_lock_sock(nsk);
-			return nsk;
-		}
-		inet_twsk_put(inet_twsk(nsk));
-		return NULL;
-	}
 
-#ifdef CONFIG_SYN_COOKIES
 	if (!th->syn)
 		sk = cookie_v6_check(sk, skb);
 #endif
@@ -1183,7 +1161,7 @@ out:
 }
 
 /* The socket must have it's spinlock held when we get
- * here.
+ * here, unless it is a TCP_LISTEN socket.
  *
  * We have a potential double-lock case here, so even when
  * doing backlog processing we use the BH locking scheme.
@@ -1254,18 +1232,14 @@ static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
 		goto csum_err;
 
 	if (sk->sk_state == TCP_LISTEN) {
-		struct sock *nsk = tcp_v6_hnd_req(sk, skb);
+		struct sock *nsk = tcp_v6_cookie_check(sk, skb);
+
 		if (!nsk)
 			goto discard;
 
-		/*
-		 * Queue it on the new socket if the new socket is active,
-		 * otherwise we just shortcircuit this and continue with
-		 * the new socket..
-		 */
 		if (nsk != sk) {
 			sock_rps_save_rxhash(nsk, skb);
-			sk_mark_napi_id(sk, skb);
+			sk_mark_napi_id(nsk, skb);
 			if (tcp_child_process(sk, nsk, skb))
 				goto reset;
 			if (opt_skb)
@@ -1398,6 +1372,33 @@ process:
 	if (sk->sk_state == TCP_TIME_WAIT)
 		goto do_time_wait;
 
+	if (sk->sk_state == TCP_NEW_SYN_RECV) {
+		struct request_sock *req = inet_reqsk(sk);
+		struct sock *nsk = NULL;
+
+		sk = req->rsk_listener;
+		tcp_v6_fill_cb(skb, hdr, th);
+		if (tcp_v6_inbound_md5_hash(sk, skb)) {
+			reqsk_put(req);
+			goto discard_it;
+		}
+		if (sk->sk_state == TCP_LISTEN)
+			nsk = tcp_check_req(sk, skb, req, false);
+		if (!nsk) {
+			reqsk_put(req);
+			goto discard_it;
+		}
+		if (nsk == sk) {
+			sock_hold(sk);
+			reqsk_put(req);
+			tcp_v6_restore_cb(skb);
+		} else if (tcp_child_process(sk, nsk, skb)) {
+			tcp_v6_send_reset(nsk, skb);
+			goto discard_it;
+		} else {
+			return 0;
+		}
+	}
 	if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) {
 		NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP);
 		goto discard_and_relse;
@@ -1408,17 +1409,21 @@ process:
 
 	tcp_v6_fill_cb(skb, hdr, th);
 
-#ifdef CONFIG_TCP_MD5SIG
 	if (tcp_v6_inbound_md5_hash(sk, skb))
 		goto discard_and_relse;
-#endif
 
 	if (sk_filter(sk, skb))
 		goto discard_and_relse;
 
-	sk_incoming_cpu_update(sk);
 	skb->dev = NULL;
 
+	if (sk->sk_state == TCP_LISTEN) {
+		ret = tcp_v6_do_rcv(sk, skb);
+		goto put_and_return;
+	}
+
+	sk_incoming_cpu_update(sk);
+
 	bh_lock_sock_nested(sk);
 	tcp_sk(sk)->segs_in += max_t(u16, 1, skb_shinfo(skb)->gso_segs);
 	ret = 0;
@@ -1433,6 +1438,7 @@ process:
 	}
 	bh_unlock_sock(sk);
 
+put_and_return:
 	sock_put(sk);
 	return ret ? -1 : 0;
 
@@ -1633,7 +1639,7 @@ static void tcp_v6_destroy_sock(struct sock *sk)
 #ifdef CONFIG_PROC_FS
 /* Proc filesystem TCPv6 sock list dumping. */
 static void get_openreq6(struct seq_file *seq,
-			 struct request_sock *req, int i, kuid_t uid)
+			 const struct request_sock *req, int i)
 {
 	long ttd = req->rsk_timer.expires - jiffies;
 	const struct in6_addr *src = &inet_rsk(req)->ir_v6_loc_addr;
@@ -1657,7 +1663,8 @@ static void get_openreq6(struct seq_file *seq,
 		   1,   /* timers active (only the expire timer) */
 		   jiffies_to_clock_t(ttd),
 		   req->num_timeout,
-		   from_kuid_munged(seq_user_ns(seq), uid),
+		   from_kuid_munged(seq_user_ns(seq),
+				    sock_i_uid(req->rsk_listener)),
 		   0,  /* non standard timer */
 		   0, /* open_requests have no inode */
 		   0, req);
@@ -1762,18 +1769,12 @@ static int tcp6_seq_show(struct seq_file *seq, void *v)
 	}
 	st = seq->private;
 
-	switch (st->state) {
-	case TCP_SEQ_STATE_LISTENING:
-	case TCP_SEQ_STATE_ESTABLISHED:
-		if (sk->sk_state == TCP_TIME_WAIT)
-			get_timewait6_sock(seq, v, st->num);
-		else
-			get_tcp6_sock(seq, v, st->num);
-		break;
-	case TCP_SEQ_STATE_OPENREQ:
-		get_openreq6(seq, v, st->num, st->uid);
-		break;
-	}
+	if (sk->sk_state == TCP_TIME_WAIT)
+		get_timewait6_sock(seq, v, st->num);
+	else if (sk->sk_state == TCP_NEW_SYN_RECV)
+		get_openreq6(seq, v, st->num);
+	else
+		get_tcp6_sock(seq, v, st->num);
 out:
 	return 0;
 }
diff --git a/net/sched/sch_fq.c b/net/sched/sch_fq.c
index f377702d4b91..3386cce4751e 100644
--- a/net/sched/sch_fq.c
+++ b/net/sched/sch_fq.c
@@ -224,13 +224,15 @@ static struct fq_flow *fq_classify(struct sk_buff *skb, struct fq_sched_data *q)
 	if (unlikely((skb->priority & TC_PRIO_MAX) == TC_PRIO_CONTROL))
 		return &q->internal;
 
-	/* SYNACK messages are attached to a listener socket.
-	 * 1) They are not part of a 'flow' yet
-	 * 2) We do not want to rate limit them (eg SYNFLOOD attack),
+	/* SYNACK messages are attached to a TCP_NEW_SYN_RECV request socket
+	 * 1) request sockets are not full blown,
+	 *    they do not contain sk_pacing_rate
+	 * 2) They are not part of a 'flow' yet
+	 * 3) We do not want to rate limit them (eg SYNFLOOD attack),
 	 *    especially if the listener set SO_MAX_PACING_RATE
-	 * 3) We pretend they are orphaned
+	 * 4) We pretend they are orphaned
 	 */
-	if (!sk || sk->sk_state == TCP_LISTEN) {
+	if (!sk || sk->sk_state == TCP_NEW_SYN_RECV) {
 		unsigned long hash = skb_get_hash(skb) & q->orphan_mask;
 
 		/* By forcing low order bit to 1, we make sure to not