[INET]: Generalise tcp_bind_hash & tcp_inherit_port

This required moving tcp_bucket_cachep to inet_hashinfo.
Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/inet_hashtables.h

@@ -14,12 +14,15 @@
 #ifndef _INET_HASHTABLES_H
 #define _INET_HASHTABLES_H
 
+#include <linux/interrupt.h>
 #include <linux/ip.h>
 #include <linux/list.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/types.h>
 
+#include <net/sock.h>
+
 /* This is for all connections with a full identity, no wildcards.
  * New scheme, half the table is for TIME_WAIT, the other half is
  * for the rest.  I'll experiment with dynamic table growth later.
@@ -113,6 +116,7 @@ struct inet_hashinfo {
 	atomic_t			lhash_users;
 	wait_queue_head_t		lhash_wait;
 	spinlock_t			portalloc_lock;
+	kmem_cache_t			*bind_bucket_cachep;
 };
 
 static inline int inet_ehashfn(const __u32 laddr, const __u16 lport,
@@ -148,6 +152,9 @@ static inline int inet_bhashfn(const __u16 lport, const int bhash_size)
 	return lport & (bhash_size - 1);
 }
 
+extern void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
+			   const unsigned short snum);
+
 /* These can have wildcards, don't try too hard. */
 static inline int inet_lhashfn(const unsigned short num)
 {
@@ -159,4 +166,29 @@ static inline int inet_sk_listen_hashfn(const struct sock *sk)
 	return inet_lhashfn(inet_sk(sk)->num);
 }
 
+/* Caller must disable local BH processing. */
+static inline void __inet_inherit_port(struct inet_hashinfo *table,
+				       struct sock *sk, struct sock *child)
+{
+	const int bhash = inet_bhashfn(inet_sk(child)->num, table->bhash_size);
+	struct inet_bind_hashbucket *head = &table->bhash[bhash];
+	struct inet_bind_bucket *tb;
+
+	spin_lock(&head->lock);
+	tb = inet_sk(sk)->bind_hash;
+	sk_add_bind_node(child, &tb->owners);
+	inet_sk(child)->bind_hash = tb;
+	spin_unlock(&head->lock);
+}
+
+static inline void inet_inherit_port(struct inet_hashinfo *table,
+				     struct sock *sk, struct sock *child)
+{
+	local_bh_disable();
+	__inet_inherit_port(table, sk, child);
+	local_bh_enable();
+}
+
+extern void inet_put_port(struct inet_hashinfo *table, struct sock *sk);
+
 #endif /* _INET_HASHTABLES_H */

include/net/tcp.h

@@ -51,14 +51,10 @@ extern struct inet_hashinfo	tcp_hashinfo;
 #define tcp_lhash_users		(tcp_hashinfo.lhash_users)
 #define tcp_lhash_wait		(tcp_hashinfo.lhash_wait)
 #define tcp_portalloc_lock	(tcp_hashinfo.portalloc_lock)
-
-extern kmem_cache_t *tcp_bucket_cachep;
+#define tcp_bucket_cachep	(tcp_hashinfo.bind_bucket_cachep)
 
 extern int tcp_port_rover;
 
-extern void tcp_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
-			  unsigned short snum);
-
 #if (BITS_PER_LONG == 64)
 #define TCP_ADDRCMP_ALIGN_BYTES 8
 #else
@@ -549,9 +545,6 @@ DECLARE_SNMP_STAT(struct tcp_mib, tcp_statistics);
 #define TCP_ADD_STATS_BH(field, val)	SNMP_ADD_STATS_BH(tcp_statistics, field, val)
 #define TCP_ADD_STATS_USER(field, val)	SNMP_ADD_STATS_USER(tcp_statistics, field, val)
 
-extern void			tcp_put_port(struct sock *sk);
-extern void			tcp_inherit_port(struct sock *sk, struct sock *child);
-
 extern void			tcp_v4_err(struct sk_buff *skb, u32);
 
 extern void			tcp_shutdown (struct sock *sk, int how);
@@ -1268,7 +1261,7 @@ static __inline__ void tcp_set_state(struct sock *sk, int state)
 		sk->sk_prot->unhash(sk);
 		if (inet_sk(sk)->bind_hash &&
 		    !(sk->sk_userlocks & SOCK_BINDPORT_LOCK))
-			tcp_put_port(sk);
+			inet_put_port(&tcp_hashinfo, sk);
 		/* fall through */
 	default:
 		if (oldstate==TCP_ESTABLISHED)

net/ipv4/inet_hashtables.c

@@ -14,6 +14,7 @@
  */
 
 #include <linux/config.h>
+#include <linux/module.h>
 #include <linux/slab.h>
 
 #include <net/inet_hashtables.h>
@@ -49,3 +50,42 @@ void inet_bind_bucket_destroy(kmem_cache_t *cachep, struct inet_bind_bucket *tb)
 		kmem_cache_free(cachep, tb);
 	}
 }
+
+void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
+		    const unsigned short snum)
+{
+	struct inet_sock *inet = inet_sk(sk);
+	inet->num	= snum;
+	sk_add_bind_node(sk, &tb->owners);
+	inet->bind_hash	= tb;
+}
+
+EXPORT_SYMBOL(inet_bind_hash);
+
+/*
+ * Get rid of any references to a local port held by the given sock.
+ */
+static void __inet_put_port(struct inet_hashinfo *hashinfo, struct sock *sk)
+{
+	struct inet_sock *inet = inet_sk(sk);
+	const int bhash = inet_bhashfn(inet->num, hashinfo->bhash_size);
+	struct inet_bind_hashbucket *head = &hashinfo->bhash[bhash];
+	struct inet_bind_bucket *tb;
+
+	spin_lock(&head->lock);
+	tb = inet->bind_hash;
+	__sk_del_bind_node(sk);
+	inet->bind_hash = NULL;
+	inet->num = 0;
+	inet_bind_bucket_destroy(hashinfo->bind_bucket_cachep, tb);
+	spin_unlock(&head->lock);
+}
+
+void inet_put_port(struct inet_hashinfo *hashinfo, struct sock *sk)
+{
+	local_bh_disable();
+	__inet_put_port(hashinfo, sk);
+	local_bh_enable();
+}
+
+EXPORT_SYMBOL(inet_put_port);

net/ipv4/tcp.c

@@ -271,10 +271,6 @@ int sysctl_tcp_fin_timeout = TCP_FIN_TIMEOUT;
 
 DEFINE_SNMP_STAT(struct tcp_mib, tcp_statistics);
 
-kmem_cache_t *tcp_bucket_cachep;
-
-EXPORT_SYMBOL_GPL(tcp_bucket_cachep);
-
 kmem_cache_t *tcp_timewait_cachep;
 
 atomic_t tcp_orphan_count = ATOMIC_INIT(0);

net/ipv4/tcp_ipv4.c

@@ -104,37 +104,6 @@ struct inet_hashinfo __cacheline_aligned tcp_hashinfo = {
 int sysctl_local_port_range[2] = { 1024, 4999 };
 int tcp_port_rover = 1024 - 1;
 
-/* Caller must disable local BH processing. */
-static __inline__ void __tcp_inherit_port(struct sock *sk, struct sock *child)
-{
-	struct inet_bind_hashbucket *head =
-				&tcp_bhash[inet_bhashfn(inet_sk(child)->num,
-							tcp_bhash_size)];
-	struct inet_bind_bucket *tb;
-
-	spin_lock(&head->lock);
-	tb = inet_sk(sk)->bind_hash;
-	sk_add_bind_node(child, &tb->owners);
-	inet_sk(child)->bind_hash = tb;
-	spin_unlock(&head->lock);
-}
-
-inline void tcp_inherit_port(struct sock *sk, struct sock *child)
-{
-	local_bh_disable();
-	__tcp_inherit_port(sk, child);
-	local_bh_enable();
-}
-
-void tcp_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
-		   const unsigned short snum)
-{
-	struct inet_sock *inet = inet_sk(sk);
-	inet->num	= snum;
-	sk_add_bind_node(sk, &tb->owners);
-	inet->bind_hash	= tb;
-}
-
 static inline int tcp_bind_conflict(struct sock *sk, struct inet_bind_bucket *tb)
 {
 	const u32 sk_rcv_saddr = tcp_v4_rcv_saddr(sk);
@@ -248,7 +217,7 @@ static int tcp_v4_get_port(struct sock *sk, unsigned short snum)
 		tb->fastreuse = 0;
 success:
 	if (!inet_sk(sk)->bind_hash)
-		tcp_bind_hash(sk, tb, snum);
+		inet_bind_hash(sk, tb, snum);
 	BUG_TRAP(inet_sk(sk)->bind_hash == tb);
  	ret = 0;
 
@@ -259,32 +228,6 @@ static int tcp_v4_get_port(struct sock *sk, unsigned short snum)
 	return ret;
 }
 
-/* Get rid of any references to a local port held by the
- * given sock.
- */
-static void __tcp_put_port(struct sock *sk)
-{
-	struct inet_sock *inet = inet_sk(sk);
-	struct inet_bind_hashbucket *head = &tcp_bhash[inet_bhashfn(inet->num,
-								    tcp_bhash_size)];
-	struct inet_bind_bucket *tb;
-
-	spin_lock(&head->lock);
-	tb = inet->bind_hash;
-	__sk_del_bind_node(sk);
-	inet->bind_hash = NULL;
-	inet->num = 0;
-	inet_bind_bucket_destroy(tcp_bucket_cachep, tb);
-	spin_unlock(&head->lock);
-}
-
-void tcp_put_port(struct sock *sk)
-{
-	local_bh_disable();
-	__tcp_put_port(sk);
-	local_bh_enable();
-}
-
 /* This lock without WQ_FLAG_EXCLUSIVE is good on UP and it can be very bad on SMP.
  * Look, when several writers sleep and reader wakes them up, all but one
  * immediately hit write lock and grab all the cpus. Exclusive sleep solves
@@ -678,7 +621,7 @@ static inline int tcp_v4_hash_connect(struct sock *sk)
 		hint += i;
 
  		/* Head lock still held and bh's disabled */
- 		tcp_bind_hash(sk, tb, port);
+ 		inet_bind_hash(sk, tb, port);
 		if (sk_unhashed(sk)) {
  			inet_sk(sk)->sport = htons(port);
  			__tcp_v4_hash(sk, 0);
@@ -1537,7 +1480,7 @@ struct sock *tcp_v4_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
 	tcp_initialize_rcv_mss(newsk);
 
 	__tcp_v4_hash(newsk, 0);
-	__tcp_inherit_port(sk, newsk);
+	__inet_inherit_port(&tcp_hashinfo, sk, newsk);
 
 	return newsk;
 
@@ -1942,7 +1885,7 @@ int tcp_v4_destroy_sock(struct sock *sk)
 
 	/* Clean up a referenced TCP bind bucket. */
 	if (inet_sk(sk)->bind_hash)
-		tcp_put_port(sk);
+		inet_put_port(&tcp_hashinfo, sk);
 
 	/*
 	 * If sendmsg cached page exists, toss it.
@@ -2486,14 +2429,11 @@ void __init tcp_v4_init(struct net_proto_family *ops)
 }
 
 EXPORT_SYMBOL(ipv4_specific);
-EXPORT_SYMBOL(tcp_bind_hash);
 EXPORT_SYMBOL(inet_bind_bucket_create);
 EXPORT_SYMBOL(tcp_hashinfo);
-EXPORT_SYMBOL(tcp_inherit_port);
 EXPORT_SYMBOL(tcp_listen_wlock);
 EXPORT_SYMBOL(tcp_port_rover);
 EXPORT_SYMBOL(tcp_prot);
-EXPORT_SYMBOL(tcp_put_port);
 EXPORT_SYMBOL(tcp_unhash);
 EXPORT_SYMBOL(tcp_v4_conn_request);
 EXPORT_SYMBOL(tcp_v4_connect);

net/ipv6/tcp_ipv6.c

@@ -205,7 +205,7 @@ static int tcp_v6_get_port(struct sock *sk, unsigned short snum)
 
 success:
 	if (!inet_sk(sk)->bind_hash)
-		tcp_bind_hash(sk, tb, snum);
+		inet_bind_hash(sk, tb, snum);
 	BUG_TRAP(inet_sk(sk)->bind_hash == tb);
 	ret = 0;
 
@@ -597,7 +597,7 @@ static int tcp_v6_hash_connect(struct sock *sk)
 		hint += i;
 
  		/* Head lock still held and bh's disabled */
- 		tcp_bind_hash(sk, tb, port);
+ 		inet_bind_hash(sk, tb, port);
 		if (sk_unhashed(sk)) {
  			inet_sk(sk)->sport = htons(port);
  			__tcp_v6_hash(sk);
@@ -1536,7 +1536,7 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
 	newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
 
 	__tcp_v6_hash(newsk);
-	tcp_inherit_port(sk, newsk);
+	inet_inherit_port(&tcp_hashinfo, sk, newsk);
 
 	return newsk;