1 files changed, 280 insertions, 178 deletions

diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index 7876b7d703cb..f5826ec4bcaa 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -23,21 +23,21 @@
 #if IS_ENABLED(CONFIG_IPV6)
 #include <net/inet6_hashtables.h>
 #endif
-#include <net/secure_seq.h>
+#include <net/hotdata.h>
 #include <net/ip.h>
-#include <net/tcp.h>
+#include <net/rps.h>
+#include <net/secure_seq.h>
 #include <net/sock_reuseport.h>
+#include <net/tcp.h>
 
 u32 inet_ehashfn(const struct net *net, const __be32 laddr,
 		 const __u16 lport, const __be32 faddr,
 		 const __be16 fport)
 {
-	static u32 inet_ehash_secret __read_mostly;
-
 	net_get_random_once(&inet_ehash_secret, sizeof(inet_ehash_secret));
 
-	return __inet_ehashfn(laddr, lport, faddr, fport,
-			      inet_ehash_secret + net_hash_mix(net));
+	return lport + __inet_ehashfn(laddr, 0, faddr, fport,
+				      inet_ehash_secret + net_hash_mix(net));
 }
 EXPORT_SYMBOL_GPL(inet_ehashfn);
 
@@ -58,6 +58,14 @@ static u32 sk_ehashfn(const struct sock *sk)
 			    sk->sk_daddr, sk->sk_dport);
 }
 
+static bool sk_is_connect_bind(const struct sock *sk)
+{
+	if (sk->sk_state == TCP_TIME_WAIT)
+		return inet_twsk(sk)->tw_connect_bind;
+	else
+		return sk->sk_userlocks & SOCK_CONNECT_BIND;
+}
+
 /*
  * Allocate and initialize a new local port bind bucket.
  * The bindhash mutex for snum's hash chain must be held here.
@@ -76,8 +84,8 @@ struct inet_bind_bucket *inet_bind_bucket_create(struct kmem_cache *cachep,
 		tb->port      = snum;
 		tb->fastreuse = 0;
 		tb->fastreuseport = 0;
-		INIT_HLIST_HEAD(&tb->owners);
-		hlist_add_head(&tb->node, &head->chain);
+		INIT_HLIST_HEAD(&tb->bhash2);
+		hlist_add_head_rcu(&tb->node, &head->chain);
 	}
 	return tb;
 }
@@ -85,12 +93,24 @@ struct inet_bind_bucket *inet_bind_bucket_create(struct kmem_cache *cachep,
 /*
  * Caller must hold hashbucket lock for this tb with local BH disabled
  */
-void inet_bind_bucket_destroy(struct kmem_cache *cachep, struct inet_bind_bucket *tb)
+void inet_bind_bucket_destroy(struct inet_bind_bucket *tb)
 {
-	if (hlist_empty(&tb->owners)) {
-		__hlist_del(&tb->node);
-		kmem_cache_free(cachep, tb);
+	const struct inet_bind2_bucket *tb2;
+
+	if (hlist_empty(&tb->bhash2)) {
+		hlist_del_rcu(&tb->node);
+		kfree_rcu(tb, rcu);
+		return;
 	}
+
+	if (tb->fastreuse == -1 && tb->fastreuseport == -1)
+		return;
+	hlist_for_each_entry(tb2, &tb->bhash2, bhash_node) {
+		if (tb2->fastreuse != -1 || tb2->fastreuseport != -1)
+			return;
+	}
+	tb->fastreuse = -1;
+	tb->fastreuseport = -1;
 }
 
 bool inet_bind_bucket_match(const struct inet_bind_bucket *tb, const struct net *net,
@@ -100,61 +120,79 @@ bool inet_bind_bucket_match(const struct inet_bind_bucket *tb, const struct net
 		tb->l3mdev == l3mdev;
 }
 
-static void inet_bind2_bucket_init(struct inet_bind2_bucket *tb,
+static void inet_bind2_bucket_init(struct inet_bind2_bucket *tb2,
 				   struct net *net,
 				   struct inet_bind_hashbucket *head,
-				   unsigned short port, int l3mdev,
+				   struct inet_bind_bucket *tb,
 				   const struct sock *sk)
 {
-	write_pnet(&tb->ib_net, net);
-	tb->l3mdev    = l3mdev;
-	tb->port      = port;
+	write_pnet(&tb2->ib_net, net);
+	tb2->l3mdev = tb->l3mdev;
+	tb2->port = tb->port;
 #if IS_ENABLED(CONFIG_IPV6)
-	tb->family    = sk->sk_family;
-	if (sk->sk_family == AF_INET6)
-		tb->v6_rcv_saddr = sk->sk_v6_rcv_saddr;
-	else
+	BUILD_BUG_ON(USHRT_MAX < (IPV6_ADDR_ANY | IPV6_ADDR_MAPPED));
+	if (sk->sk_family == AF_INET6) {
+		tb2->addr_type = ipv6_addr_type(&sk->sk_v6_rcv_saddr);
+		tb2->v6_rcv_saddr = sk->sk_v6_rcv_saddr;
+	} else {
+		tb2->addr_type = IPV6_ADDR_MAPPED;
+		ipv6_addr_set_v4mapped(sk->sk_rcv_saddr, &tb2->v6_rcv_saddr);
+	}
+#else
+	tb2->rcv_saddr = sk->sk_rcv_saddr;
 #endif
-		tb->rcv_saddr = sk->sk_rcv_saddr;
-	INIT_HLIST_HEAD(&tb->owners);
-	INIT_HLIST_HEAD(&tb->deathrow);
-	hlist_add_head(&tb->node, &head->chain);
+	tb2->fastreuse = 0;
+	tb2->fastreuseport = 0;
+	INIT_HLIST_HEAD(&tb2->owners);
+	hlist_add_head(&tb2->node, &head->chain);
+	hlist_add_head(&tb2->bhash_node, &tb->bhash2);
 }
 
 struct inet_bind2_bucket *inet_bind2_bucket_create(struct kmem_cache *cachep,
 						   struct net *net,
 						   struct inet_bind_hashbucket *head,
-						   unsigned short port,
-						   int l3mdev,
+						   struct inet_bind_bucket *tb,
 						   const struct sock *sk)
 {
-	struct inet_bind2_bucket *tb = kmem_cache_alloc(cachep, GFP_ATOMIC);
+	struct inet_bind2_bucket *tb2 = kmem_cache_alloc(cachep, GFP_ATOMIC);
 
-	if (tb)
-		inet_bind2_bucket_init(tb, net, head, port, l3mdev, sk);
+	if (tb2)
+		inet_bind2_bucket_init(tb2, net, head, tb, sk);
 
-	return tb;
+	return tb2;
 }
 
 /* Caller must hold hashbucket lock for this tb with local BH disabled */
 void inet_bind2_bucket_destroy(struct kmem_cache *cachep, struct inet_bind2_bucket *tb)
 {
-	if (hlist_empty(&tb->owners) && hlist_empty(&tb->deathrow)) {
+	const struct sock *sk;
+
+	if (hlist_empty(&tb->owners)) {
 		__hlist_del(&tb->node);
+		__hlist_del(&tb->bhash_node);
 		kmem_cache_free(cachep, tb);
+		return;
+	}
+
+	if (tb->fastreuse == -1 && tb->fastreuseport == -1)
+		return;
+	sk_for_each_bound(sk, &tb->owners) {
+		if (!sk_is_connect_bind(sk))
+			return;
 	}
+	tb->fastreuse = -1;
+	tb->fastreuseport = -1;
 }
 
 static bool inet_bind2_bucket_addr_match(const struct inet_bind2_bucket *tb2,
 					 const struct sock *sk)
 {
 #if IS_ENABLED(CONFIG_IPV6)
-	if (sk->sk_family != tb2->family)
-		return false;
-
 	if (sk->sk_family == AF_INET6)
-		return ipv6_addr_equal(&tb2->v6_rcv_saddr,
-				       &sk->sk_v6_rcv_saddr);
+		return ipv6_addr_equal(&tb2->v6_rcv_saddr, &sk->sk_v6_rcv_saddr);
+
+	if (tb2->addr_type != IPV6_ADDR_MAPPED)
+		return false;
 #endif
 	return tb2->rcv_saddr == sk->sk_rcv_saddr;
 }
@@ -163,10 +201,9 @@ void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
 		    struct inet_bind2_bucket *tb2, unsigned short port)
 {
 	inet_sk(sk)->inet_num = port;
-	sk_add_bind_node(sk, &tb->owners);
 	inet_csk(sk)->icsk_bind_hash = tb;
-	sk_add_bind2_node(sk, &tb2->owners);
 	inet_csk(sk)->icsk_bind2_hash = tb2;
+	sk_add_bind_node(sk, &tb2->owners);
 }
 
 /*
@@ -174,7 +211,7 @@ void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
  */
 static void __inet_put_port(struct sock *sk)
 {
-	struct inet_hashinfo *hashinfo = tcp_or_dccp_get_hashinfo(sk);
+	struct inet_hashinfo *hashinfo = tcp_get_hashinfo(sk);
 	struct inet_bind_hashbucket *head, *head2;
 	struct net *net = sock_net(sk);
 	struct inet_bind_bucket *tb;
@@ -186,21 +223,21 @@ static void __inet_put_port(struct sock *sk)
 
 	spin_lock(&head->lock);
 	tb = inet_csk(sk)->icsk_bind_hash;
-	__sk_del_bind_node(sk);
 	inet_csk(sk)->icsk_bind_hash = NULL;
 	inet_sk(sk)->inet_num = 0;
-	inet_bind_bucket_destroy(hashinfo->bind_bucket_cachep, tb);
+	sk->sk_userlocks &= ~SOCK_CONNECT_BIND;
 
 	spin_lock(&head2->lock);
 	if (inet_csk(sk)->icsk_bind2_hash) {
 		struct inet_bind2_bucket *tb2 = inet_csk(sk)->icsk_bind2_hash;
 
-		__sk_del_bind2_node(sk);
+		__sk_del_bind_node(sk);
 		inet_csk(sk)->icsk_bind2_hash = NULL;
 		inet_bind2_bucket_destroy(hashinfo->bind2_bucket_cachep, tb2);
 	}
 	spin_unlock(&head2->lock);
 
+	inet_bind_bucket_destroy(tb);
 	spin_unlock(&head->lock);
 }
 
@@ -214,7 +251,7 @@ EXPORT_SYMBOL(inet_put_port);
 
 int __inet_inherit_port(const struct sock *sk, struct sock *child)
 {
-	struct inet_hashinfo *table = tcp_or_dccp_get_hashinfo(sk);
+	struct inet_hashinfo *table = tcp_get_hashinfo(sk);
 	unsigned short port = inet_sk(child)->inet_num;
 	struct inet_bind_hashbucket *head, *head2;
 	bool created_inet_bind_bucket = false;
@@ -269,14 +306,13 @@ bhash2_find:
 		tb2 = inet_bind2_bucket_find(head2, net, port, l3mdev, child);
 		if (!tb2) {
 			tb2 = inet_bind2_bucket_create(table->bind2_bucket_cachep,
-						       net, head2, port,
-						       l3mdev, child);
+						       net, head2, tb, child);
 			if (!tb2)
 				goto error;
 		}
 	}
 	if (update_fastreuse)
-		inet_csk_update_fastreuse(tb, child);
+		inet_csk_update_fastreuse(child, tb, tb2);
 	inet_bind_hash(child, tb, tb2, port);
 	spin_unlock(&head2->lock);
 	spin_unlock(&head->lock);
@@ -285,7 +321,7 @@ bhash2_find:
 
 error:
 	if (created_inet_bind_bucket)
-		inet_bind_bucket_destroy(table->bind_bucket_cachep, tb);
+		inet_bind_bucket_destroy(tb);
 	spin_unlock(&head2->lock);
 	spin_unlock(&head->lock);
 	return -ENOMEM;
@@ -310,7 +346,7 @@ inet_lhash2_bucket_sk(struct inet_hashinfo *h, struct sock *sk)
 	return inet_lhash2_bucket(h, hash);
 }
 
-static inline int compute_score(struct sock *sk, struct net *net,
+static inline int compute_score(struct sock *sk, const struct net *net,
 				const unsigned short hnum, const __be32 daddr,
 				const int dif, const int sdif)
 {
@@ -348,7 +384,7 @@ static inline int compute_score(struct sock *sk, struct net *net,
  * Return: NULL if sk doesn't have SO_REUSEPORT set, otherwise a pointer to
  *         the selected sock or an error.
  */
-struct sock *inet_lookup_reuseport(struct net *net, struct sock *sk,
+struct sock *inet_lookup_reuseport(const struct net *net, struct sock *sk,
 				   struct sk_buff *skb, int doff,
 				   __be32 saddr, __be16 sport,
 				   __be32 daddr, unsigned short hnum,
@@ -374,7 +410,7 @@ EXPORT_SYMBOL_GPL(inet_lookup_reuseport);
  */
 
 /* called with rcu_read_lock() : No refcount taken on the socket */
-static struct sock *inet_lhash2_lookup(struct net *net,
+static struct sock *inet_lhash2_lookup(const struct net *net,
 				struct inet_listen_hashbucket *ilb2,
 				struct sk_buff *skb, int doff,
 				const __be32 saddr, __be16 sport,
@@ -401,7 +437,7 @@ static struct sock *inet_lhash2_lookup(struct net *net,
 	return result;
 }
 
-struct sock *inet_lookup_run_sk_lookup(struct net *net,
+struct sock *inet_lookup_run_sk_lookup(const struct net *net,
 				       int protocol,
 				       struct sk_buff *skb, int doff,
 				       __be32 saddr, __be16 sport,
@@ -423,20 +459,19 @@ struct sock *inet_lookup_run_sk_lookup(struct net *net,
 	return sk;
 }
 
-struct sock *__inet_lookup_listener(struct net *net,
-				    struct inet_hashinfo *hashinfo,
+struct sock *__inet_lookup_listener(const struct net *net,
 				    struct sk_buff *skb, int doff,
 				    const __be32 saddr, __be16 sport,
 				    const __be32 daddr, const unsigned short hnum,
 				    const int dif, const int sdif)
 {
 	struct inet_listen_hashbucket *ilb2;
+	struct inet_hashinfo *hashinfo;
 	struct sock *result = NULL;
 	unsigned int hash2;
 
 	/* Lookup redirect from BPF */
-	if (static_branch_unlikely(&bpf_sk_lookup_enabled) &&
-	    hashinfo == net->ipv4.tcp_death_row.hashinfo) {
+	if (static_branch_unlikely(&bpf_sk_lookup_enabled)) {
 		result = inet_lookup_run_sk_lookup(net, IPPROTO_TCP, skb, doff,
 						   saddr, sport, daddr, hnum, dif,
 						   inet_ehashfn);
@@ -444,6 +479,7 @@ struct sock *__inet_lookup_listener(struct net *net,
 			goto done;
 	}
 
+	hashinfo = net->ipv4.tcp_death_row.hashinfo;
 	hash2 = ipv4_portaddr_hash(net, daddr, hnum);
 	ilb2 = inet_lhash2_bucket(hashinfo, hash2);
 
@@ -488,22 +524,23 @@ void sock_edemux(struct sk_buff *skb)
 }
 EXPORT_SYMBOL(sock_edemux);
 
-struct sock *__inet_lookup_established(struct net *net,
-				  struct inet_hashinfo *hashinfo,
-				  const __be32 saddr, const __be16 sport,
-				  const __be32 daddr, const u16 hnum,
-				  const int dif, const int sdif)
+struct sock *__inet_lookup_established(const struct net *net,
+				       const __be32 saddr, const __be16 sport,
+				       const __be32 daddr, const u16 hnum,
+				       const int dif, const int sdif)
 {
-	INET_ADDR_COOKIE(acookie, saddr, daddr);
 	const __portpair ports = INET_COMBINED_PORTS(sport, hnum);
-	struct sock *sk;
+	INET_ADDR_COOKIE(acookie, saddr, daddr);
 	const struct hlist_nulls_node *node;
-	/* Optimize here for direct hit, only listening connections can
-	 * have wildcards anyways.
-	 */
-	unsigned int hash = inet_ehashfn(net, daddr, hnum, saddr, sport);
-	unsigned int slot = hash & hashinfo->ehash_mask;
-	struct inet_ehash_bucket *head = &hashinfo->ehash[slot];
+	struct inet_ehash_bucket *head;
+	struct inet_hashinfo *hashinfo;
+	unsigned int hash, slot;
+	struct sock *sk;
+
+	hashinfo = net->ipv4.tcp_death_row.hashinfo;
+	hash = inet_ehashfn(net, daddr, hnum, saddr, sport);
+	slot = hash & hashinfo->ehash_mask;
+	head = &hashinfo->ehash[slot];
 
 begin:
 	sk_nulls_for_each_rcu(sk, node, &head->chain) {
@@ -537,7 +574,9 @@ EXPORT_SYMBOL_GPL(__inet_lookup_established);
 /* called with local bh disabled */
 static int __inet_check_established(struct inet_timewait_death_row *death_row,
 				    struct sock *sk, __u16 lport,
-				    struct inet_timewait_sock **twp)
+				    struct inet_timewait_sock **twp,
+				    bool rcu_lookup,
+				    u32 hash)
 {
 	struct inet_hashinfo *hinfo = death_row->hashinfo;
 	struct inet_sock *inet = inet_sk(sk);
@@ -548,14 +587,25 @@ static int __inet_check_established(struct inet_timewait_death_row *death_row,
 	int sdif = l3mdev_master_ifindex_by_index(net, dif);
 	INET_ADDR_COOKIE(acookie, saddr, daddr);
 	const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport);
-	unsigned int hash = inet_ehashfn(net, daddr, lport,
-					 saddr, inet->inet_dport);
 	struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash);
-	spinlock_t *lock = inet_ehash_lockp(hinfo, hash);
-	struct sock *sk2;
-	const struct hlist_nulls_node *node;
 	struct inet_timewait_sock *tw = NULL;
+	const struct hlist_nulls_node *node;
+	struct sock *sk2;
+	spinlock_t *lock;
+
+	if (rcu_lookup) {
+		sk_nulls_for_each(sk2, node, &head->chain) {
+			if (sk2->sk_hash != hash ||
+			    !inet_match(net, sk2, acookie, ports, dif, sdif))
+				continue;
+			if (sk2->sk_state == TCP_TIME_WAIT)
+				break;
+			return -EADDRNOTAVAIL;
+		}
+		return 0;
+	}
 
+	lock = inet_ehash_lockp(hinfo, hash);
 	spin_lock(lock);
 
 	sk_nulls_for_each(sk2, node, &head->chain) {
@@ -565,7 +615,7 @@ static int __inet_check_established(struct inet_timewait_death_row *death_row,
 		if (likely(inet_match(net, sk2, acookie, ports, dif, sdif))) {
 			if (sk2->sk_state == TCP_TIME_WAIT) {
 				tw = inet_twsk(sk2);
-				if (twsk_unique(sk, sk2, twp))
+				if (tcp_twsk_unique(sk, sk2, twp))
 					break;
 			}
 			goto not_unique;
@@ -654,7 +704,7 @@ static bool inet_ehash_lookup_by_sk(struct sock *sk,
  */
 bool inet_ehash_insert(struct sock *sk, struct sock *osk, bool *found_dup_sk)
 {
-	struct inet_hashinfo *hashinfo = tcp_or_dccp_get_hashinfo(sk);
+	struct inet_hashinfo *hashinfo = tcp_get_hashinfo(sk);
 	struct inet_ehash_bucket *head;
 	struct hlist_nulls_head *list;
 	spinlock_t *lock;
@@ -670,8 +720,11 @@ bool inet_ehash_insert(struct sock *sk, struct sock *osk, bool *found_dup_sk)
 	spin_lock(lock);
 	if (osk) {
 		WARN_ON_ONCE(sk->sk_hash != osk->sk_hash);
-		ret = sk_nulls_del_node_init_rcu(osk);
-	} else if (found_dup_sk) {
+		ret = sk_nulls_replace_node_init_rcu(osk, sk);
+		goto unlock;
+	}
+
+	if (found_dup_sk) {
 		*found_dup_sk = inet_ehash_lookup_by_sk(sk, list);
 		if (*found_dup_sk)
 			ret = false;
@@ -680,6 +733,7 @@ bool inet_ehash_insert(struct sock *sk, struct sock *osk, bool *found_dup_sk)
 	if (ret)
 		__sk_nulls_add_node_rcu(sk, list);
 
+unlock:
 	spin_unlock(lock);
 
 	return ret;
@@ -692,22 +746,22 @@ bool inet_ehash_nolisten(struct sock *sk, struct sock *osk, bool *found_dup_sk)
 	if (ok) {
 		sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
 	} else {
-		this_cpu_inc(*sk->sk_prot->orphan_count);
+		tcp_orphan_count_inc();
 		inet_sk_set_state(sk, TCP_CLOSE);
 		sock_set_flag(sk, SOCK_DEAD);
 		inet_csk_destroy_sock(sk);
 	}
 	return ok;
 }
-EXPORT_SYMBOL_GPL(inet_ehash_nolisten);
+EXPORT_IPV6_MOD(inet_ehash_nolisten);
 
 static int inet_reuseport_add_sock(struct sock *sk,
 				   struct inet_listen_hashbucket *ilb)
 {
 	struct inet_bind_bucket *tb = inet_csk(sk)->icsk_bind_hash;
 	const struct hlist_nulls_node *node;
+	kuid_t uid = sk_uid(sk);
 	struct sock *sk2;
-	kuid_t uid = sock_i_uid(sk);
 
 	sk_nulls_for_each_rcu(sk2, node, &ilb->nulls_head) {
 		if (sk2 != sk &&
@@ -715,7 +769,7 @@ static int inet_reuseport_add_sock(struct sock *sk,
 		    ipv6_only_sock(sk2) == ipv6_only_sock(sk) &&
 		    sk2->sk_bound_dev_if == sk->sk_bound_dev_if &&
 		    inet_csk(sk2)->icsk_bind_hash == tb &&
-		    sk2->sk_reuseport && uid_eq(uid, sock_i_uid(sk2)) &&
+		    sk2->sk_reuseport && uid_eq(uid, sk_uid(sk2)) &&
 		    inet_rcv_saddr_equal(sk, sk2, false))
 			return reuseport_add_sock(sk, sk2,
 						  inet_rcv_saddr_any(sk));
@@ -724,15 +778,18 @@ static int inet_reuseport_add_sock(struct sock *sk,
 	return reuseport_alloc(sk, inet_rcv_saddr_any(sk));
 }
 
-int __inet_hash(struct sock *sk, struct sock *osk)
+int inet_hash(struct sock *sk)
 {
-	struct inet_hashinfo *hashinfo = tcp_or_dccp_get_hashinfo(sk);
+	struct inet_hashinfo *hashinfo = tcp_get_hashinfo(sk);
 	struct inet_listen_hashbucket *ilb2;
 	int err = 0;
 
+	if (sk->sk_state == TCP_CLOSE)
+		return 0;
+
 	if (sk->sk_state != TCP_LISTEN) {
 		local_bh_disable();
-		inet_ehash_nolisten(sk, osk, NULL);
+		inet_ehash_nolisten(sk, NULL, NULL);
 		local_bh_enable();
 		return 0;
 	}
@@ -745,38 +802,28 @@ int __inet_hash(struct sock *sk, struct sock *osk)
 		if (err)
 			goto unlock;
 	}
+	sock_set_flag(sk, SOCK_RCU_FREE);
 	if (IS_ENABLED(CONFIG_IPV6) && sk->sk_reuseport &&
 		sk->sk_family == AF_INET6)
 		__sk_nulls_add_node_tail_rcu(sk, &ilb2->nulls_head);
 	else
 		__sk_nulls_add_node_rcu(sk, &ilb2->nulls_head);
-	sock_set_flag(sk, SOCK_RCU_FREE);
 	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
 unlock:
 	spin_unlock(&ilb2->lock);
 
 	return err;
 }
-EXPORT_SYMBOL(__inet_hash);
-
-int inet_hash(struct sock *sk)
-{
-	int err = 0;
-
-	if (sk->sk_state != TCP_CLOSE)
-		err = __inet_hash(sk, NULL);
-
-	return err;
-}
-EXPORT_SYMBOL_GPL(inet_hash);
+EXPORT_IPV6_MOD(inet_hash);
 
 void inet_unhash(struct sock *sk)
 {
-	struct inet_hashinfo *hashinfo = tcp_or_dccp_get_hashinfo(sk);
+	struct inet_hashinfo *hashinfo = tcp_get_hashinfo(sk);
 
 	if (sk_unhashed(sk))
 		return;
 
+	sock_rps_delete_flow(sk);
 	if (sk->sk_state == TCP_LISTEN) {
 		struct inet_listen_hashbucket *ilb2;
 
@@ -785,11 +832,6 @@ void inet_unhash(struct sock *sk)
 		 * avoid circular locking dependency on PREEMPT_RT.
 		 */
 		spin_lock(&ilb2->lock);
-		if (sk_unhashed(sk)) {
-			spin_unlock(&ilb2->lock);
-			return;
-		}
-
 		if (rcu_access_pointer(sk->sk_reuseport_cb))
 			reuseport_stop_listen_sock(sk);
 
@@ -800,56 +842,43 @@ void inet_unhash(struct sock *sk)
 		spinlock_t *lock = inet_ehash_lockp(hashinfo, sk->sk_hash);
 
 		spin_lock_bh(lock);
-		if (sk_unhashed(sk)) {
-			spin_unlock_bh(lock);
-			return;
-		}
 		__sk_nulls_del_node_init_rcu(sk);
 		sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
 		spin_unlock_bh(lock);
 	}
 }
-EXPORT_SYMBOL_GPL(inet_unhash);
+EXPORT_IPV6_MOD(inet_unhash);
 
 static bool inet_bind2_bucket_match(const struct inet_bind2_bucket *tb,
 				    const struct net *net, unsigned short port,
 				    int l3mdev, const struct sock *sk)
 {
-#if IS_ENABLED(CONFIG_IPV6)
-	if (sk->sk_family != tb->family)
+	if (!net_eq(ib2_net(tb), net) || tb->port != port ||
+	    tb->l3mdev != l3mdev)
 		return false;
 
-	if (sk->sk_family == AF_INET6)
-		return net_eq(ib2_net(tb), net) && tb->port == port &&
-			tb->l3mdev == l3mdev &&
-			ipv6_addr_equal(&tb->v6_rcv_saddr, &sk->sk_v6_rcv_saddr);
-	else
-#endif
-		return net_eq(ib2_net(tb), net) && tb->port == port &&
-			tb->l3mdev == l3mdev && tb->rcv_saddr == sk->sk_rcv_saddr;
+	return inet_bind2_bucket_addr_match(tb, sk);
 }
 
 bool inet_bind2_bucket_match_addr_any(const struct inet_bind2_bucket *tb, const struct net *net,
 				      unsigned short port, int l3mdev, const struct sock *sk)
 {
+	if (!net_eq(ib2_net(tb), net) || tb->port != port ||
+	    tb->l3mdev != l3mdev)
+		return false;
+
 #if IS_ENABLED(CONFIG_IPV6)
-	if (sk->sk_family != tb->family) {
-		if (sk->sk_family == AF_INET)
-			return net_eq(ib2_net(tb), net) && tb->port == port &&
-				tb->l3mdev == l3mdev &&
-				ipv6_addr_any(&tb->v6_rcv_saddr);
+	if (tb->addr_type == IPV6_ADDR_ANY)
+		return true;
 
+	if (tb->addr_type != IPV6_ADDR_MAPPED)
 		return false;
-	}
 
-	if (sk->sk_family == AF_INET6)
-		return net_eq(ib2_net(tb), net) && tb->port == port &&
-			tb->l3mdev == l3mdev &&
-			ipv6_addr_any(&tb->v6_rcv_saddr);
-	else
+	if (sk->sk_family == AF_INET6 &&
+	    !ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr))
+		return false;
 #endif
-		return net_eq(ib2_net(tb), net) && tb->port == port &&
-			tb->l3mdev == l3mdev && tb->rcv_saddr == 0;
+	return tb->rcv_saddr == 0;
 }
 
 /* The socket's bhash2 hashbucket spinlock must be held when this is called */
@@ -869,7 +898,7 @@ inet_bind2_bucket_find(const struct inet_bind_hashbucket *head, const struct net
 struct inet_bind_hashbucket *
 inet_bhash2_addr_any_hashbucket(const struct sock *sk, const struct net *net, int port)
 {
-	struct inet_hashinfo *hinfo = tcp_or_dccp_get_hashinfo(sk);
+	struct inet_hashinfo *hinfo = tcp_get_hashinfo(sk);
 	u32 hash;
 
 #if IS_ENABLED(CONFIG_IPV6)
@@ -897,7 +926,7 @@ static void inet_update_saddr(struct sock *sk, void *saddr, int family)
 
 static int __inet_bhash2_update_saddr(struct sock *sk, void *saddr, int family, bool reset)
 {
-	struct inet_hashinfo *hinfo = tcp_or_dccp_get_hashinfo(sk);
+	struct inet_hashinfo *hinfo = tcp_get_hashinfo(sk);
 	struct inet_bind_hashbucket *head, *head2;
 	struct inet_bind2_bucket *tb2, *new_tb2;
 	int l3mdev = inet_sk_bound_l3mdev(sk);
@@ -944,7 +973,7 @@ static int __inet_bhash2_update_saddr(struct sock *sk, void *saddr, int family,
 	spin_lock_bh(&head->lock);
 
 	spin_lock(&head2->lock);
-	__sk_del_bind2_node(sk);
+	__sk_del_bind_node(sk);
 	inet_bind2_bucket_destroy(hinfo->bind2_bucket_cachep, inet_csk(sk)->icsk_bind2_hash);
 	spin_unlock(&head2->lock);
 
@@ -959,10 +988,14 @@ static int __inet_bhash2_update_saddr(struct sock *sk, void *saddr, int family,
 	tb2 = inet_bind2_bucket_find(head2, net, port, l3mdev, sk);
 	if (!tb2) {
 		tb2 = new_tb2;
-		inet_bind2_bucket_init(tb2, net, head2, port, l3mdev, sk);
+		inet_bind2_bucket_init(tb2, net, head2, inet_csk(sk)->icsk_bind_hash, sk);
+		if (sk_is_connect_bind(sk)) {
+			tb2->fastreuse = -1;
+			tb2->fastreuseport = -1;
+		}
 	}
-	sk_add_bind2_node(sk, &tb2->owners);
 	inet_csk(sk)->icsk_bind2_hash = tb2;
+	sk_add_bind_node(sk, &tb2->owners);
 	spin_unlock(&head2->lock);
 
 	spin_unlock_bh(&head->lock);
@@ -977,14 +1010,14 @@ int inet_bhash2_update_saddr(struct sock *sk, void *saddr, int family)
 {
 	return __inet_bhash2_update_saddr(sk, saddr, family, false);
 }
-EXPORT_SYMBOL_GPL(inet_bhash2_update_saddr);
+EXPORT_IPV6_MOD(inet_bhash2_update_saddr);
 
 void inet_bhash2_reset_saddr(struct sock *sk)
 {
 	if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK))
 		__inet_bhash2_update_saddr(sk, NULL, 0, true);
 }
-EXPORT_SYMBOL_GPL(inet_bhash2_reset_saddr);
+EXPORT_IPV6_MOD(inet_bhash2_reset_saddr);
 
 /* RFC 6056 3.3.4.  Algorithm 4: Double-Hash Port Selection Algorithm
  * Note that we use 32bit integers (vs RFC 'short integers')
@@ -1001,8 +1034,10 @@ static u32 *table_perturb;
 
 int __inet_hash_connect(struct inet_timewait_death_row *death_row,
 		struct sock *sk, u64 port_offset,
+		u32 hash_port0,
 		int (*check_established)(struct inet_timewait_death_row *,
-			struct sock *, __u16, struct inet_timewait_sock **))
+			struct sock *, __u16, struct inet_timewait_sock **,
+			bool rcu_lookup, u32 hash))
 {
 	struct inet_hashinfo *hinfo = death_row->hashinfo;
 	struct inet_bind_hashbucket *head, *head2;
@@ -1014,22 +1049,26 @@ int __inet_hash_connect(struct inet_timewait_death_row *death_row,
 	bool tb_created = false;
 	u32 remaining, offset;
 	int ret, i, low, high;
-	int l3mdev;
+	bool local_ports;
+	int step, l3mdev;
 	u32 index;
 
 	if (port) {
 		local_bh_disable();
-		ret = check_established(death_row, sk, port, NULL);
+		ret = check_established(death_row, sk, port, NULL, false,
+					hash_port0 + port);
 		local_bh_enable();
 		return ret;
 	}
 
 	l3mdev = inet_sk_bound_l3mdev(sk);
 
-	inet_sk_get_local_port_range(sk, &low, &high);
+	local_ports = inet_sk_get_local_port_range(sk, &low, &high);
+	step = local_ports ? 1 : 2;
+
 	high++; /* [32768, 60999] -> [32768, 61000[ */
 	remaining = high - low;
-	if (likely(remaining > 1))
+	if (!local_ports && remaining > 1)
 		remaining &= ~1U;
 
 	get_random_sleepable_once(table_perturb,
@@ -1042,16 +1081,33 @@ int __inet_hash_connect(struct inet_timewait_death_row *death_row,
 	/* In first pass we try ports of @low parity.
 	 * inet_csk_get_port() does the opposite choice.
 	 */
-	offset &= ~1U;
+	if (!local_ports)
+		offset &= ~1U;
 other_parity_scan:
 	port = low + offset;
-	for (i = 0; i < remaining; i += 2, port += 2) {
+	for (i = 0; i < remaining; i += step, port += step) {
 		if (unlikely(port >= high))
 			port -= remaining;
 		if (inet_is_local_reserved_port(net, port))
 			continue;
 		head = &hinfo->bhash[inet_bhashfn(net, port,
 						  hinfo->bhash_size)];
+		rcu_read_lock();
+		hlist_for_each_entry_rcu(tb, &head->chain, node) {
+			if (!inet_bind_bucket_match(tb, net, port, l3mdev))
+				continue;
+			if (tb->fastreuse >= 0 || tb->fastreuseport >= 0) {
+				rcu_read_unlock();
+				goto next_port;
+			}
+			if (!check_established(death_row, sk, port, &tw, true,
+					       hash_port0 + port))
+				break;
+			rcu_read_unlock();
+			goto next_port;
+		}
+		rcu_read_unlock();
+
 		spin_lock_bh(&head->lock);
 
 		/* Does not bother with rcv_saddr checks, because
@@ -1061,12 +1117,13 @@ other_parity_scan:
 			if (inet_bind_bucket_match(tb, net, port, l3mdev)) {
 				if (tb->fastreuse >= 0 ||
 				    tb->fastreuseport >= 0)
-					goto next_port;
-				WARN_ON(hlist_empty(&tb->owners));
+					goto next_port_unlock;
+				WARN_ON(hlist_empty(&tb->bhash2));
 				if (!check_established(death_row, sk,
-						       port, &tw))
+						       port, &tw, false,
+						       hash_port0 + port))
 					goto ok;
-				goto next_port;
+				goto next_port_unlock;
 			}
 		}
 
@@ -1080,15 +1137,17 @@ other_parity_scan:
 		tb->fastreuse = -1;
 		tb->fastreuseport = -1;
 		goto ok;
-next_port:
+next_port_unlock:
 		spin_unlock_bh(&head->lock);
+next_port:
 		cond_resched();
 	}
 
-	offset++;
-	if ((offset & 1) && remaining > 1)
-		goto other_parity_scan;
-
+	if (!local_ports) {
+		offset++;
+		if ((offset & 1) && remaining > 1)
+			goto other_parity_scan;
+	}
 	return -EADDRNOTAVAIL;
 
 ok:
@@ -1101,9 +1160,11 @@ ok:
 	tb2 = inet_bind2_bucket_find(head2, net, port, l3mdev, sk);
 	if (!tb2) {
 		tb2 = inet_bind2_bucket_create(hinfo->bind2_bucket_cachep, net,
-					       head2, port, l3mdev, sk);
+					       head2, tb, sk);
 		if (!tb2)
 			goto error;
+		tb2->fastreuse = -1;
+		tb2->fastreuseport = -1;
 	}
 
 	/* Here we want to add a little bit of randomness to the next source
@@ -1111,11 +1172,12 @@ ok:
 	 * on low contention the randomness is maximal and on high contention
 	 * it may be inexistent.
 	 */
-	i = max_t(int, i, get_random_u32_below(8) * 2);
-	WRITE_ONCE(table_perturb[index], READ_ONCE(table_perturb[index]) + i + 2);
+	i = max_t(int, i, get_random_u32_below(8) * step);
+	WRITE_ONCE(table_perturb[index], READ_ONCE(table_perturb[index]) + i + step);
 
 	/* Head lock still held and bh's disabled */
 	inet_bind_hash(sk, tb, tb2, port);
+	sk->sk_userlocks |= SOCK_CONNECT_BIND;
 
 	if (sk_unhashed(sk)) {
 		inet_sk(sk)->inet_sport = htons(port);
@@ -1133,10 +1195,33 @@ ok:
 	return 0;
 
 error:
+	if (sk_hashed(sk)) {
+		spinlock_t *lock = inet_ehash_lockp(hinfo, sk->sk_hash);
+
+		sock_prot_inuse_add(net, sk->sk_prot, -1);
+
+		spin_lock(lock);
+		__sk_nulls_del_node_init_rcu(sk);
+		spin_unlock(lock);
+
+		sk->sk_hash = 0;
+		inet_sk(sk)->inet_sport = 0;
+		inet_sk(sk)->inet_num = 0;
+
+		if (tw)
+			inet_twsk_bind_unhash(tw, hinfo);
+	}
+
 	spin_unlock(&head2->lock);
 	if (tb_created)
-		inet_bind_bucket_destroy(hinfo->bind_bucket_cachep, tb);
-	spin_unlock_bh(&head->lock);
+		inet_bind_bucket_destroy(tb);
+	spin_unlock(&head->lock);
+
+	if (tw)
+		inet_twsk_deschedule_put(tw);
+
+	local_bh_enable();
+
 	return -ENOMEM;
 }
 
@@ -1146,14 +1231,20 @@ error:
 int inet_hash_connect(struct inet_timewait_death_row *death_row,
 		      struct sock *sk)
 {
+	const struct inet_sock *inet = inet_sk(sk);
+	const struct net *net = sock_net(sk);
 	u64 port_offset = 0;
+	u32 hash_port0;
 
 	if (!inet_sk(sk)->inet_num)
 		port_offset = inet_sk_port_offset(sk);
-	return __inet_hash_connect(death_row, sk, port_offset,
+
+	hash_port0 = inet_ehashfn(net, inet->inet_rcv_saddr, 0,
+				  inet->inet_daddr, inet->inet_dport);
+
+	return __inet_hash_connect(death_row, sk, port_offset, hash_port0,
 				   __inet_check_established);
 }
-EXPORT_SYMBOL_GPL(inet_hash_connect);
 
 static void init_hashinfo_lhash2(struct inet_hashinfo *h)
 {
@@ -1204,32 +1295,45 @@ int inet_hashinfo2_init_mod(struct inet_hashinfo *h)
 	init_hashinfo_lhash2(h);
 	return 0;
 }
-EXPORT_SYMBOL_GPL(inet_hashinfo2_init_mod);
 
 int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo)
 {
 	unsigned int locksz = sizeof(spinlock_t);
 	unsigned int i, nblocks = 1;
+	spinlock_t *ptr = NULL;
 
-	if (locksz != 0) {
-		/* allocate 2 cache lines or at least one spinlock per cpu */
-		nblocks = max(2U * L1_CACHE_BYTES / locksz, 1U);
-		nblocks = roundup_pow_of_two(nblocks * num_possible_cpus());
+	if (locksz == 0)
+		goto set_mask;
 
-		/* no more locks than number of hash buckets */
-		nblocks = min(nblocks, hashinfo->ehash_mask + 1);
+	/* Allocate 2 cache lines or at least one spinlock per cpu. */
+	nblocks = max(2U * L1_CACHE_BYTES / locksz, 1U) * num_possible_cpus();
 
-		hashinfo->ehash_locks = kvmalloc_array(nblocks, locksz, GFP_KERNEL);
-		if (!hashinfo->ehash_locks)
-			return -ENOMEM;
+	/* At least one page per NUMA node. */
+	nblocks = max(nblocks, num_online_nodes() * PAGE_SIZE / locksz);
+
+	nblocks = roundup_pow_of_two(nblocks);
+
+	/* No more locks than number of hash buckets. */
+	nblocks = min(nblocks, hashinfo->ehash_mask + 1);
 
-		for (i = 0; i < nblocks; i++)
-			spin_lock_init(&hashinfo->ehash_locks[i]);
+	if (num_online_nodes() > 1) {
+		/* Use vmalloc() to allow NUMA policy to spread pages
+		 * on all available nodes if desired.
+		 */
+		ptr = vmalloc_array(nblocks, locksz);
+	}
+	if (!ptr) {
+		ptr = kvmalloc_array(nblocks, locksz, GFP_KERNEL);
+		if (!ptr)
+			return -ENOMEM;
 	}
+	for (i = 0; i < nblocks; i++)
+		spin_lock_init(&ptr[i]);
+	hashinfo->ehash_locks = ptr;
+set_mask:
 	hashinfo->ehash_locks_mask = nblocks - 1;
 	return 0;
 }
-EXPORT_SYMBOL_GPL(inet_ehash_locks_alloc);
 
 struct inet_hashinfo *inet_pernet_hashinfo_alloc(struct inet_hashinfo *hashinfo,
 						 unsigned int ehash_entries)
@@ -1265,7 +1369,6 @@ free_hashinfo:
 err:
 	return NULL;
 }
-EXPORT_SYMBOL_GPL(inet_pernet_hashinfo_alloc);
 
 void inet_pernet_hashinfo_free(struct inet_hashinfo *hashinfo)
 {
@@ -1276,4 +1379,3 @@ void inet_pernet_hashinfo_free(struct inet_hashinfo *hashinfo)
 	vfree(hashinfo->ehash);
 	kfree(hashinfo);
 }
-EXPORT_SYMBOL_GPL(inet_pernet_hashinfo_free);