Bluetooth: Initial work for L2CAP split.

This patch tries to do the minimal to move l2cap_sock_create() and its
dependencies to l2cap_sock.c. It create a API to initialize and cleanup
the L2CAP sockets from l2cap_core.c through l2cap_init_sockets() and
l2cap_cleanup_sockets().

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

3 files changed, 225 insertions, 177 deletions

diff --git a/net/bluetooth/Makefile b/net/bluetooth/Makefile
index bf2945e1d9ef..339b42932b33 100644
--- a/net/bluetooth/Makefile
+++ b/net/bluetooth/Makefile
@@ -11,4 +11,4 @@ obj-$(CONFIG_BT_CMTP)	+= cmtp/
 obj-$(CONFIG_BT_HIDP)   += hidp/
 
 bluetooth-y := af_bluetooth.o hci_core.o hci_conn.o hci_event.o mgmt.o hci_sock.o hci_sysfs.o lib.o
-l2cap-y := l2cap_core.o
+l2cap-y := l2cap_core.o l2cap_sock.o
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 28d2954f94a4..af678efec15f 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -24,7 +24,7 @@
    SOFTWARE IS DISCLAIMED.
 */
 
-/* Bluetooth L2CAP core and sockets. */
+/* Bluetooth L2CAP core. */
 
 #include <linux/module.h>
 
@@ -57,24 +57,20 @@
 
 #define VERSION "2.15"
 
-static int disable_ertm;
+int disable_ertm;
 
 static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN;
 static u8 l2cap_fixed_chan[8] = { 0x02, };
 
-static const struct proto_ops l2cap_sock_ops;
-
 static struct workqueue_struct *_busy_wq;
 
-static struct bt_sock_list l2cap_sk_list = {
+struct bt_sock_list l2cap_sk_list = {
         .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock)
 };
 
 static void l2cap_busy_work(struct work_struct *work);
 
-static void __l2cap_sock_close(struct sock *sk, int reason);
 static void l2cap_sock_close(struct sock *sk);
-static void l2cap_sock_kill(struct sock *sk);
 
 static int l2cap_build_conf_req(struct sock *sk, void *data);
 static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
@@ -83,7 +79,7 @@ static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
 static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb);
 
 /* ---- L2CAP timers ---- */
-static void l2cap_sock_set_timer(struct sock *sk, long timeout)
+void l2cap_sock_set_timer(struct sock *sk, long timeout)
 {
         BT_DBG("sk %p state %d timeout %ld", sk, sk->sk_state, timeout);
         sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout);
@@ -95,39 +91,6 @@ static void l2cap_sock_clear_timer(struct sock *sk)
         sk_stop_timer(sk, &sk->sk_timer);
 }
 
-static void l2cap_sock_timeout(unsigned long arg)
-{
-        struct sock *sk = (struct sock *) arg;
-        int reason;
-
-        BT_DBG("sock %p state %d", sk, sk->sk_state);
-
-        bh_lock_sock(sk);
-
-        if (sock_owned_by_user(sk)) {
-                /* sk is owned by user. Try again later */
-                l2cap_sock_set_timer(sk, HZ / 5);
-                bh_unlock_sock(sk);
-                sock_put(sk);
-                return;
-        }
-
-        if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONFIG)
-                reason = ECONNREFUSED;
-        else if (sk->sk_state == BT_CONNECT &&
-                                l2cap_pi(sk)->sec_level != BT_SECURITY_SDP)
-                reason = ECONNREFUSED;
-        else
-                reason = ETIMEDOUT;
-
-        __l2cap_sock_close(sk, reason);
-
-        bh_unlock_sock(sk);
-
-        l2cap_sock_kill(sk);
-        sock_put(sk);
-}
-
 /* ---- L2CAP channels ---- */
 static struct sock *__l2cap_get_chan_by_dcid(struct l2cap_chan_list *l, u16 cid)
 {
@@ -801,14 +764,6 @@ static struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src)
         return node ? sk : sk1;
 }
 
-static void l2cap_sock_destruct(struct sock *sk)
-{
-        BT_DBG("sk %p", sk);
-
-        skb_queue_purge(&sk->sk_receive_queue);
-        skb_queue_purge(&sk->sk_write_queue);
-}
-
 static void l2cap_sock_cleanup_listen(struct sock *parent)
 {
         struct sock *sk;
@@ -826,7 +781,7 @@ static void l2cap_sock_cleanup_listen(struct sock *parent)
 /* Kill socket (only if zapped and orphan)
  * Must be called on unlocked socket.
  */
-static void l2cap_sock_kill(struct sock *sk)
+void l2cap_sock_kill(struct sock *sk)
 {
         if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
                 return;
@@ -839,7 +794,7 @@ static void l2cap_sock_kill(struct sock *sk)
         sock_put(sk);
 }
 
-static void __l2cap_sock_close(struct sock *sk, int reason)
+void __l2cap_sock_close(struct sock *sk, int reason)
 {
         BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
 
@@ -904,111 +859,6 @@ static void l2cap_sock_close(struct sock *sk)
         l2cap_sock_kill(sk);
 }
 
-static void l2cap_sock_init(struct sock *sk, struct sock *parent)
-{
-        struct l2cap_pinfo *pi = l2cap_pi(sk);
-
-        BT_DBG("sk %p", sk);
-
-        if (parent) {
-                sk->sk_type = parent->sk_type;
-                bt_sk(sk)->defer_setup = bt_sk(parent)->defer_setup;
-
-                pi->imtu = l2cap_pi(parent)->imtu;
-                pi->omtu = l2cap_pi(parent)->omtu;
-                pi->conf_state = l2cap_pi(parent)->conf_state;
-                pi->mode = l2cap_pi(parent)->mode;
-                pi->fcs  = l2cap_pi(parent)->fcs;
-                pi->max_tx = l2cap_pi(parent)->max_tx;
-                pi->tx_win = l2cap_pi(parent)->tx_win;
-                pi->sec_level = l2cap_pi(parent)->sec_level;
-                pi->role_switch = l2cap_pi(parent)->role_switch;
-                pi->force_reliable = l2cap_pi(parent)->force_reliable;
-                pi->flushable = l2cap_pi(parent)->flushable;
-        } else {
-                pi->imtu = L2CAP_DEFAULT_MTU;
-                pi->omtu = 0;
-                if (!disable_ertm && sk->sk_type == SOCK_STREAM) {
-                        pi->mode = L2CAP_MODE_ERTM;
-                        pi->conf_state |= L2CAP_CONF_STATE2_DEVICE;
-                } else {
-                        pi->mode = L2CAP_MODE_BASIC;
-                }
-                pi->max_tx = L2CAP_DEFAULT_MAX_TX;
-                pi->fcs  = L2CAP_FCS_CRC16;
-                pi->tx_win = L2CAP_DEFAULT_TX_WINDOW;
-                pi->sec_level = BT_SECURITY_LOW;
-                pi->role_switch = 0;
-                pi->force_reliable = 0;
-                pi->flushable = BT_FLUSHABLE_OFF;
-        }
-
-        /* Default config options */
-        pi->conf_len = 0;
-        pi->flush_to = L2CAP_DEFAULT_FLUSH_TO;
-        skb_queue_head_init(TX_QUEUE(sk));
-        skb_queue_head_init(SREJ_QUEUE(sk));
-        skb_queue_head_init(BUSY_QUEUE(sk));
-        INIT_LIST_HEAD(SREJ_LIST(sk));
-}
-
-static struct proto l2cap_proto = {
-        .name           = "L2CAP",
-        .owner          = THIS_MODULE,
-        .obj_size       = sizeof(struct l2cap_pinfo)
-};
-
-static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio)
-{
-        struct sock *sk;
-
-        sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto);
-        if (!sk)
-                return NULL;
-
-        sock_init_data(sock, sk);
-        INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
-
-        sk->sk_destruct = l2cap_sock_destruct;
-        sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT);
-
-        sock_reset_flag(sk, SOCK_ZAPPED);
-
-        sk->sk_protocol = proto;
-        sk->sk_state = BT_OPEN;
-
-        setup_timer(&sk->sk_timer, l2cap_sock_timeout, (unsigned long) sk);
-
-        bt_sock_link(&l2cap_sk_list, sk);
-        return sk;
-}
-
-static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol,
-                             int kern)
-{
-        struct sock *sk;
-
-        BT_DBG("sock %p", sock);
-
-        sock->state = SS_UNCONNECTED;
-
-        if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM &&
-                        sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
-                return -ESOCKTNOSUPPORT;
-
-        if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
-                return -EPERM;
-
-        sock->ops = &l2cap_sock_ops;
-
-        sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC);
-        if (!sk)
-                return -ENOMEM;
-
-        l2cap_sock_init(sk, NULL);
-        return 0;
-}
-
 static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
 {
         struct sock *sk = sock->sk;
@@ -4865,7 +4715,7 @@ static const struct file_operations l2cap_debugfs_fops = {
 
 static struct dentry *l2cap_debugfs;
 
-static const struct proto_ops l2cap_sock_ops = {
+const struct proto_ops l2cap_sock_ops = {
         .family         = PF_BLUETOOTH,
         .owner          = THIS_MODULE,
         .release        = l2cap_sock_release,
@@ -4885,12 +4735,6 @@ static const struct proto_ops l2cap_sock_ops = {
         .getsockopt     = l2cap_sock_getsockopt
 };
 
-static const struct net_proto_family l2cap_sock_family_ops = {
-        .family = PF_BLUETOOTH,
-        .owner  = THIS_MODULE,
-        .create = l2cap_sock_create,
-};
-
 static struct hci_proto l2cap_hci_proto = {
         .name           = "L2CAP",
         .id             = HCI_PROTO_L2CAP,
@@ -4906,19 +4750,13 @@ static int __init l2cap_init(void)
 {
         int err;
 
-        err = proto_register(&l2cap_proto, 0);
+        err = l2cap_init_sockets();
         if (err < 0)
                 return err;
 
         _busy_wq = create_singlethread_workqueue("l2cap");
         if (!_busy_wq) {
-                proto_unregister(&l2cap_proto);
-                return -ENOMEM;
-        }
-
-        err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
-        if (err < 0) {
-                BT_ERR("L2CAP socket registration failed");
+                err = -ENOMEM;
                 goto error;
         }
 
@@ -4943,7 +4781,7 @@ static int __init l2cap_init(void)
 
 error:
         destroy_workqueue(_busy_wq);
-        proto_unregister(&l2cap_proto);
+        l2cap_cleanup_sockets();
         return err;
 }
 
@@ -4954,13 +4792,10 @@ static void __exit l2cap_exit(void)
         flush_workqueue(_busy_wq);
         destroy_workqueue(_busy_wq);
 
-        if (bt_sock_unregister(BTPROTO_L2CAP) < 0)
-                BT_ERR("L2CAP socket unregistration failed");
-
         if (hci_unregister_proto(&l2cap_hci_proto) < 0)
                 BT_ERR("L2CAP protocol unregistration failed");
 
-        proto_unregister(&l2cap_proto);
+        l2cap_cleanup_sockets();
 }
 
 void l2cap_load(void)
diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
new file mode 100644
index 000000000000..6ea1894cecb7
--- /dev/null
+++ b/net/bluetooth/l2cap_sock.c
@@ -0,0 +1,213 @@
+/*
+   BlueZ - Bluetooth protocol stack for Linux
+   Copyright (C) 2000-2001 Qualcomm Incorporated
+   Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org>
+   Copyright (C) 2010 Google Inc.
+
+   Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License version 2 as
+   published by the Free Software Foundation;
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
+   IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
+   CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
+   WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+   ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+   OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+   ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
+   COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
+   SOFTWARE IS DISCLAIMED.
+*/
+
+/* Bluetooth L2CAP sockets. */
+
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/l2cap.h>
+
+static void l2cap_sock_timeout(unsigned long arg)
+{
+        struct sock *sk = (struct sock *) arg;
+        int reason;
+
+        BT_DBG("sock %p state %d", sk, sk->sk_state);
+
+        bh_lock_sock(sk);
+
+        if (sock_owned_by_user(sk)) {
+                /* sk is owned by user. Try again later */
+                l2cap_sock_set_timer(sk, HZ / 5);
+                bh_unlock_sock(sk);
+                sock_put(sk);
+                return;
+        }
+
+        if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONFIG)
+                reason = ECONNREFUSED;
+        else if (sk->sk_state == BT_CONNECT &&
+                                l2cap_pi(sk)->sec_level != BT_SECURITY_SDP)
+                reason = ECONNREFUSED;
+        else
+                reason = ETIMEDOUT;
+
+        __l2cap_sock_close(sk, reason);
+
+        bh_unlock_sock(sk);
+
+        l2cap_sock_kill(sk);
+        sock_put(sk);
+}
+
+
+static void l2cap_sock_destruct(struct sock *sk)
+{
+        BT_DBG("sk %p", sk);
+
+        skb_queue_purge(&sk->sk_receive_queue);
+        skb_queue_purge(&sk->sk_write_queue);
+}
+
+void l2cap_sock_init(struct sock *sk, struct sock *parent)
+{
+        struct l2cap_pinfo *pi = l2cap_pi(sk);
+
+        BT_DBG("sk %p", sk);
+
+        if (parent) {
+                sk->sk_type = parent->sk_type;
+                bt_sk(sk)->defer_setup = bt_sk(parent)->defer_setup;
+
+                pi->imtu = l2cap_pi(parent)->imtu;
+                pi->omtu = l2cap_pi(parent)->omtu;
+                pi->conf_state = l2cap_pi(parent)->conf_state;
+                pi->mode = l2cap_pi(parent)->mode;
+                pi->fcs  = l2cap_pi(parent)->fcs;
+                pi->max_tx = l2cap_pi(parent)->max_tx;
+                pi->tx_win = l2cap_pi(parent)->tx_win;
+                pi->sec_level = l2cap_pi(parent)->sec_level;
+                pi->role_switch = l2cap_pi(parent)->role_switch;
+                pi->force_reliable = l2cap_pi(parent)->force_reliable;
+                pi->flushable = l2cap_pi(parent)->flushable;
+        } else {
+                pi->imtu = L2CAP_DEFAULT_MTU;
+                pi->omtu = 0;
+                if (!disable_ertm && sk->sk_type == SOCK_STREAM) {
+                        pi->mode = L2CAP_MODE_ERTM;
+                        pi->conf_state |= L2CAP_CONF_STATE2_DEVICE;
+                } else {
+                        pi->mode = L2CAP_MODE_BASIC;
+                }
+                pi->max_tx = L2CAP_DEFAULT_MAX_TX;
+                pi->fcs  = L2CAP_FCS_CRC16;
+                pi->tx_win = L2CAP_DEFAULT_TX_WINDOW;
+                pi->sec_level = BT_SECURITY_LOW;
+                pi->role_switch = 0;
+                pi->force_reliable = 0;
+                pi->flushable = BT_FLUSHABLE_OFF;
+        }
+
+        /* Default config options */
+        pi->conf_len = 0;
+        pi->flush_to = L2CAP_DEFAULT_FLUSH_TO;
+        skb_queue_head_init(TX_QUEUE(sk));
+        skb_queue_head_init(SREJ_QUEUE(sk));
+        skb_queue_head_init(BUSY_QUEUE(sk));
+        INIT_LIST_HEAD(SREJ_LIST(sk));
+}
+
+static struct proto l2cap_proto = {
+        .name           = "L2CAP",
+        .owner          = THIS_MODULE,
+        .obj_size       = sizeof(struct l2cap_pinfo)
+};
+
+struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio)
+{
+        struct sock *sk;
+
+        sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto);
+        if (!sk)
+                return NULL;
+
+        sock_init_data(sock, sk);
+        INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
+
+        sk->sk_destruct = l2cap_sock_destruct;
+        sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT);
+
+        sock_reset_flag(sk, SOCK_ZAPPED);
+
+        sk->sk_protocol = proto;
+        sk->sk_state = BT_OPEN;
+
+        setup_timer(&sk->sk_timer, l2cap_sock_timeout, (unsigned long) sk);
+
+        bt_sock_link(&l2cap_sk_list, sk);
+        return sk;
+}
+
+static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol,
+                             int kern)
+{
+        struct sock *sk;
+
+        BT_DBG("sock %p", sock);
+
+        sock->state = SS_UNCONNECTED;
+
+        if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM &&
+                        sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
+                return -ESOCKTNOSUPPORT;
+
+        if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
+                return -EPERM;
+
+        sock->ops = &l2cap_sock_ops;
+
+        sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC);
+        if (!sk)
+                return -ENOMEM;
+
+        l2cap_sock_init(sk, NULL);
+        return 0;
+}
+
+static const struct net_proto_family l2cap_sock_family_ops = {
+        .family = PF_BLUETOOTH,
+        .owner  = THIS_MODULE,
+        .create = l2cap_sock_create,
+};
+
+int __init l2cap_init_sockets(void)
+{
+       int err;
+
+       err = proto_register(&l2cap_proto, 0);
+       if (err < 0)
+               return err;
+
+       err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
+       if (err < 0)
+               goto error;
+
+       BT_INFO("L2CAP socket layer initialized");
+
+       return 0;
+
+error:
+       BT_ERR("L2CAP socket registration failed");
+       proto_unregister(&l2cap_proto);
+       return err;
+}
+
+void l2cap_cleanup_sockets(void)
+{
+       if (bt_sock_unregister(BTPROTO_L2CAP) < 0)
+               BT_ERR("L2CAP socket unregistration failed");
+
+       proto_unregister(&l2cap_proto);
+}