Bluetooth: Add l2cap_chan_ops abstraction

Add an abstraction layer between L2CAP core and its users (only
l2cap_sock.c now). The first function implemented is new_connection() that
replaces calls to l2cap_sock_alloc() in l2cap_core.c

Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

3 files changed, 43 insertions, 15 deletions

diff --git a/include/net/bluetooth/l2cap.h b/include/net/bluetooth/l2cap.h
index 0529d278e068..d3a150955c44 100644
--- a/include/net/bluetooth/l2cap.h
+++ b/include/net/bluetooth/l2cap.h
@@ -354,6 +354,15 @@ struct l2cap_chan {
 
         struct list_head list;
         struct list_head global_l;
+
+        void            *data;
+        struct l2cap_ops *ops;
+};
+
+struct l2cap_ops {
+        char            *name;
+
+        struct l2cap_chan       *(*new_connection) (void *data);
 };
 
 struct l2cap_conn {
@@ -460,9 +469,6 @@ int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm);
 int l2cap_add_scid(struct l2cap_chan *chan,  __u16 scid);
 
 void l2cap_sock_kill(struct sock *sk);
-void l2cap_sock_init(struct sock *sk, struct sock *parent);
-struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock,
-                                                        int proto, gfp_t prio);
 
 struct l2cap_chan *l2cap_chan_create(struct sock *sk);
 void l2cap_chan_close(struct l2cap_chan *chan, int reason);
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 49f890bce312..8369f5680391 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -842,18 +842,16 @@ static void l2cap_le_conn_ready(struct l2cap_conn *conn)
                 goto clean;
         }
 
-        sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC);
-        if (!sk)
+        chan = pchan->ops->new_connection(pchan->data);
+        if (!chan)
                 goto clean;
 
-        chan = l2cap_pi(sk)->chan;
+        sk = chan->sk;
 
         write_lock_bh(&conn->chan_lock);
 
         hci_conn_hold(conn->hcon);
 
-        l2cap_sock_init(sk, parent);
-
         bacpy(&bt_sk(sk)->src, conn->src);
         bacpy(&bt_sk(sk)->dst, conn->dst);
 
@@ -2329,10 +2327,12 @@ static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hd
                 goto response;
         }
 
-        sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC);
-        if (!sk)
+        chan = pchan->ops->new_connection(pchan->data);
+        if (!chan)
                 goto response;
 
+        sk = chan->sk;
+
         write_lock_bh(&conn->chan_lock);
 
         /* Check if we already have channel with that dcid */
@@ -2345,9 +2345,6 @@ static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hd
 
         hci_conn_hold(conn->hcon);
 
-        chan = l2cap_pi(sk)->chan;
-
-        l2cap_sock_init(sk, parent);
         bacpy(&bt_sk(sk)->src, conn->src);
         bacpy(&bt_sk(sk)->dst, conn->dst);
         chan->psm  = psm;
diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
index 2f4fd5751a46..4050edeaf78b 100644
--- a/net/bluetooth/l2cap_sock.c
+++ b/net/bluetooth/l2cap_sock.c
@@ -31,6 +31,8 @@
 #include <net/bluetooth/l2cap.h>
 
 static const struct proto_ops l2cap_sock_ops;
+static void l2cap_sock_init(struct sock *sk, struct sock *parent);
+static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio);
 
 static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
 {
@@ -773,6 +775,25 @@ static int l2cap_sock_release(struct socket *sock)
         return err;
 }
 
+static struct l2cap_chan *l2cap_sock_new_connection_cb(void *data)
+{
+        struct sock *sk, *parent = data;
+
+        sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP,
+                                                                GFP_ATOMIC);
+        if (!sk)
+                return NULL;
+
+        l2cap_sock_init(sk, parent);
+
+        return l2cap_pi(sk)->chan;
+}
+
+static struct l2cap_ops l2cap_chan_ops = {
+        .name           = "L2CAP Socket Interface",
+        .new_connection = l2cap_sock_new_connection_cb,
+};
+
 static void l2cap_sock_destruct(struct sock *sk)
 {
         BT_DBG("sk %p", sk);
@@ -781,7 +802,7 @@ static void l2cap_sock_destruct(struct sock *sk)
         skb_queue_purge(&sk->sk_write_queue);
 }
 
-void l2cap_sock_init(struct sock *sk, struct sock *parent)
+static void l2cap_sock_init(struct sock *sk, struct sock *parent)
 {
         struct l2cap_pinfo *pi = l2cap_pi(sk);
         struct l2cap_chan *chan = pi->chan;
@@ -838,10 +859,14 @@ void l2cap_sock_init(struct sock *sk, struct sock *parent)
                 chan->force_reliable = 0;
                 chan->flushable = BT_FLUSHABLE_OFF;
                 chan->force_active = BT_POWER_FORCE_ACTIVE_ON;
+
         }
 
         /* Default config options */
         chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
+
+        chan->data = sk;
+        chan->ops = &l2cap_chan_ops;
 }
 
 static struct proto l2cap_proto = {
@@ -850,7 +875,7 @@ static struct proto l2cap_proto = {
         .obj_size       = sizeof(struct l2cap_pinfo)
 };
 
-struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio)
+static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio)
 {
         struct sock *sk;
         struct l2cap_chan *chan;