[IPV6]: Reuse inet_csk_get_port in tcp_v6_get_port

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

5 files changed, 21 insertions, 97 deletions

diff --git a/include/net/inet_connection_sock.h b/include/net/inet_connection_sock.h
index b0c99060b78d..edc68e858d51 100644
--- a/include/net/inet_connection_sock.h
+++ b/include/net/inet_connection_sock.h
@@ -192,8 +192,12 @@ extern struct request_sock *inet_csk_search_req(const struct sock *sk,
                                                 const __u16 rport,
                                                 const __u32 raddr,
                                                 const __u32 laddr);
+extern int inet_csk_bind_conflict(const struct sock *sk,
+                                  const struct inet_bind_bucket *tb);
 extern int inet_csk_get_port(struct inet_hashinfo *hashinfo,
-                             struct sock *sk, unsigned short snum);
+                             struct sock *sk, unsigned short snum,
+                             int (*bind_conflict)(const struct sock *sk,
+                                                  const struct inet_bind_bucket *tb));
 
 extern struct dst_entry* inet_csk_route_req(struct sock *sk,
                                             const struct request_sock *req);
diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c
index 656e13e38cfb..1ac3e30ae791 100644
--- a/net/dccp/ipv4.c
+++ b/net/dccp/ipv4.c
@@ -37,7 +37,8 @@ EXPORT_SYMBOL_GPL(dccp_hashinfo);
 
 static int dccp_v4_get_port(struct sock *sk, const unsigned short snum)
 {
-        return inet_csk_get_port(&dccp_hashinfo, sk, snum);
+        return inet_csk_get_port(&dccp_hashinfo, sk, snum,
+                                 inet_csk_bind_conflict);
 }
 
 static void dccp_v4_hash(struct sock *sk)
diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index 3fe021f1a566..f05b6e761102 100644
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -37,7 +37,8 @@ EXPORT_SYMBOL(inet_csk_timer_bug_msg);
  */
 int sysctl_local_port_range[2] = { 1024, 4999 };
 
-static inline int inet_csk_bind_conflict(struct sock *sk, struct inet_bind_bucket *tb)
+int inet_csk_bind_conflict(const struct sock *sk,
+                           const struct inet_bind_bucket *tb)
 {
         const u32 sk_rcv_saddr = inet_rcv_saddr(sk);
         struct sock *sk2;
@@ -62,11 +63,15 @@ static inline int inet_csk_bind_conflict(struct sock *sk, struct inet_bind_bucke
         return node != NULL;
 }
 
+EXPORT_SYMBOL_GPL(inet_csk_bind_conflict);
+
 /* Obtain a reference to a local port for the given sock,
  * if snum is zero it means select any available local port.
  */
 int inet_csk_get_port(struct inet_hashinfo *hashinfo,
-                      struct sock *sk, unsigned short snum)
+                      struct sock *sk, unsigned short snum,
+                      int (*bind_conflict)(const struct sock *sk,
+                                           const struct inet_bind_bucket *tb))
 {
         struct inet_bind_hashbucket *head;
         struct hlist_node *node;
@@ -125,7 +130,7 @@ tb_found:
                         goto success;
                 } else {
                         ret = 1;
-                        if (inet_csk_bind_conflict(sk, tb))
+                        if (bind_conflict(sk, tb))
                                 goto fail_unlock;
                 }
         }
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 4d5021e1929b..2aa19c89a94a 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -97,7 +97,8 @@ struct inet_hashinfo __cacheline_aligned tcp_hashinfo = {
 
 static int tcp_v4_get_port(struct sock *sk, unsigned short snum)
 {
-        return inet_csk_get_port(&tcp_hashinfo, sk, snum);
+        return inet_csk_get_port(&tcp_hashinfo, sk, snum,
+                                 inet_csk_bind_conflict);
 }
 
 static void tcp_v4_hash(struct sock *sk)
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 8827389abaf7..76c8f5a2f7f3 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -76,8 +76,8 @@ static int	tcp_v6_xmit(struct sk_buff *skb, int ipfragok);
 static struct tcp_func ipv6_mapped;
 static struct tcp_func ipv6_specific;
 
-static inline int tcp_v6_bind_conflict(const struct sock *sk,
-                                       const struct inet_bind_bucket *tb)
+int inet6_csk_bind_conflict(const struct sock *sk,
+                            const struct inet_bind_bucket *tb)
 {
         const struct sock *sk2;
         const struct hlist_node *node;
@@ -97,97 +97,10 @@ static inline int tcp_v6_bind_conflict(const struct sock *sk,
         return node != NULL;
 }
 
-/* Grrr, addr_type already calculated by caller, but I don't want
- * to add some silly "cookie" argument to this method just for that.
- * But it doesn't matter, the recalculation is in the rarest path
- * this function ever takes.
- */
 static int tcp_v6_get_port(struct sock *sk, unsigned short snum)
 {
-        struct inet_bind_hashbucket *head;
-        struct inet_bind_bucket *tb;
-        struct hlist_node *node;
-        int ret;
-
-        local_bh_disable();
-        if (snum == 0) {
-                int low = sysctl_local_port_range[0];
-                int high = sysctl_local_port_range[1];
-                int remaining = (high - low) + 1;
-                int rover = net_random() % (high - low) + low;
-
-                do {
-                        head = &tcp_hashinfo.bhash[inet_bhashfn(rover, tcp_hashinfo.bhash_size)];
-                        spin_lock(&head->lock);
-                        inet_bind_bucket_for_each(tb, node, &head->chain)
-                                if (tb->port == rover)
-                                        goto next;
-                        break;
-                next:
-                        spin_unlock(&head->lock);
-                        if (++rover > high)
-                                rover = low;
-                } while (--remaining > 0);
-
-                /* Exhausted local port range during search?  It is not
-                 * possible for us to be holding one of the bind hash
-                 * locks if this test triggers, because if 'remaining'
-                 * drops to zero, we broke out of the do/while loop at
-                 * the top level, not from the 'break;' statement.
-                 */
-                ret = 1;
-                if (unlikely(remaining <= 0))
-                        goto fail;
-
-                /* OK, here is the one we will use. */
-                snum = rover;
-        } else {
-                head = &tcp_hashinfo.bhash[inet_bhashfn(snum, tcp_hashinfo.bhash_size)];
-                spin_lock(&head->lock);
-                inet_bind_bucket_for_each(tb, node, &head->chain)
-                        if (tb->port == snum)
-                                goto tb_found;
-        }
-        tb = NULL;
-        goto tb_not_found;
-tb_found:
-        if (tb && !hlist_empty(&tb->owners)) {
-                if (tb->fastreuse > 0 && sk->sk_reuse &&
-                    sk->sk_state != TCP_LISTEN) {
-                        goto success;
-                } else {
-                        ret = 1;
-                        if (tcp_v6_bind_conflict(sk, tb))
-                                goto fail_unlock;
-                }
-        }
-tb_not_found:
-        ret = 1;
-        if (tb == NULL) {
-                tb = inet_bind_bucket_create(tcp_hashinfo.bind_bucket_cachep, head, snum);
-                if (tb == NULL)
-                        goto fail_unlock;
-        }
-        if (hlist_empty(&tb->owners)) {
-                if (sk->sk_reuse && sk->sk_state != TCP_LISTEN)
-                        tb->fastreuse = 1;
-                else
-                        tb->fastreuse = 0;
-        } else if (tb->fastreuse &&
-                   (!sk->sk_reuse || sk->sk_state == TCP_LISTEN))
-                tb->fastreuse = 0;
-
-success:
-        if (!inet_csk(sk)->icsk_bind_hash)
-                inet_bind_hash(sk, tb, snum);
-        BUG_TRAP(inet_csk(sk)->icsk_bind_hash == tb);
-        ret = 0;
-
-fail_unlock:
-        spin_unlock(&head->lock);
-fail:
-        local_bh_enable();
-        return ret;
+        return inet_csk_get_port(&tcp_hashinfo, sk, snum,
+                                 inet6_csk_bind_conflict);
 }
 
 static __inline__ void __tcp_v6_hash(struct sock *sk)