[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>

6 files changed, 81 insertions, 80 deletions

diff --git a/include/net/inet_hashtables.h b/include/net/inet_hashtables.h
index 3a6c11ca421d..da9705525f15 100644
--- a/include/net/inet_hashtables.h
+++ b/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 */
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 6c6c879e7e87..9eb8ff7c911e 100644
--- a/include/net/tcp.h
+++ b/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)
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index 343a890bd617..33d6cbe32cdc 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/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);
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index e54a410ca701..38c04c1a754c 100644
--- a/net/ipv4/tcp.c
+++ b/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);
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 10a9b3ae3442..40fe4f5fca1c 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/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 @@ tb_not_found:
                 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 @@ fail:
         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 @@ ok:
                 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);
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index a8ca7ba06c1c..bfbedb56bce2 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -205,7 +205,7 @@ tb_not_found:
 
 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 @@ ok:
                 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;