Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2259 insertions, 0 deletions

diff --git a/net/bluetooth/rfcomm/core.c b/net/bluetooth/rfcomm/core.c
new file mode 100644
index 000000000..b98225d65
--- /dev/null
+++ b/net/bluetooth/rfcomm/core.c
@@ -0,0 +1,2259 @@
+/*
+   RFCOMM implementation for Linux Bluetooth stack (BlueZ).
+   Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com>
+   Copyright (C) 2002 Marcel Holtmann <marcel@holtmann.org>
+
+   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 RFCOMM core.
+ */
+
+#include <linux/module.h>
+#include <linux/debugfs.h>
+#include <linux/kthread.h>
+#include <asm/unaligned.h>
+
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
+#include <net/bluetooth/l2cap.h>
+#include <net/bluetooth/rfcomm.h>
+
+#define VERSION "1.11"
+
+static bool disable_cfc;
+static bool l2cap_ertm;
+static int channel_mtu = -1;
+static unsigned int l2cap_mtu = RFCOMM_MAX_L2CAP_MTU;
+
+static struct task_struct *rfcomm_thread;
+
+static DEFINE_MUTEX(rfcomm_mutex);
+#define rfcomm_lock()	mutex_lock(&rfcomm_mutex)
+#define rfcomm_unlock()	mutex_unlock(&rfcomm_mutex)
+
+
+static LIST_HEAD(session_list);
+
+static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len);
+static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci);
+static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci);
+static int rfcomm_queue_disc(struct rfcomm_dlc *d);
+static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type);
+static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d);
+static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig);
+static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len);
+static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits);
+static void rfcomm_make_uih(struct sk_buff *skb, u8 addr);
+
+static void rfcomm_process_connect(struct rfcomm_session *s);
+
+static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src,
+							bdaddr_t *dst,
+							u8 sec_level,
+							int *err);
+static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst);
+static struct rfcomm_session *rfcomm_session_del(struct rfcomm_session *s);
+
+/* ---- RFCOMM frame parsing macros ---- */
+#define __get_dlci(b)     ((b & 0xfc) >> 2)
+#define __get_channel(b)  ((b & 0xf8) >> 3)
+#define __get_dir(b)      ((b & 0x04) >> 2)
+#define __get_type(b)     ((b & 0xef))
+
+#define __test_ea(b)      ((b & 0x01))
+#define __test_cr(b)      (!!(b & 0x02))
+#define __test_pf(b)      (!!(b & 0x10))
+
+#define __session_dir(s)  ((s)->initiator ? 0x00 : 0x01)
+
+#define __addr(cr, dlci)       (((dlci & 0x3f) << 2) | (cr << 1) | 0x01)
+#define __ctrl(type, pf)       (((type & 0xef) | (pf << 4)))
+#define __dlci(dir, chn)       (((chn & 0x1f) << 1) | dir)
+#define __srv_channel(dlci)    (dlci >> 1)
+#define __dir(dlci)            (dlci & 0x01)
+
+#define __len8(len)       (((len) << 1) | 1)
+#define __len16(len)      ((len) << 1)
+
+/* MCC macros */
+#define __mcc_type(cr, type)   (((type << 2) | (cr << 1) | 0x01))
+#define __get_mcc_type(b) ((b & 0xfc) >> 2)
+#define __get_mcc_len(b)  ((b & 0xfe) >> 1)
+
+/* RPN macros */
+#define __rpn_line_settings(data, stop, parity)  ((data & 0x3) | ((stop & 0x1) << 2) | ((parity & 0x7) << 3))
+#define __get_rpn_data_bits(line) ((line) & 0x3)
+#define __get_rpn_stop_bits(line) (((line) >> 2) & 0x1)
+#define __get_rpn_parity(line)    (((line) >> 3) & 0x7)
+
+static DECLARE_WAIT_QUEUE_HEAD(rfcomm_wq);
+
+static void rfcomm_schedule(void)
+{
+	wake_up_all(&rfcomm_wq);
+}
+
+/* ---- RFCOMM FCS computation ---- */
+
+/* reversed, 8-bit, poly=0x07 */
+static unsigned char rfcomm_crc_table[256] = {
+	0x00, 0x91, 0xe3, 0x72, 0x07, 0x96, 0xe4, 0x75,
+	0x0e, 0x9f, 0xed, 0x7c, 0x09, 0x98, 0xea, 0x7b,
+	0x1c, 0x8d, 0xff, 0x6e, 0x1b, 0x8a, 0xf8, 0x69,
+	0x12, 0x83, 0xf1, 0x60, 0x15, 0x84, 0xf6, 0x67,
+
+	0x38, 0xa9, 0xdb, 0x4a, 0x3f, 0xae, 0xdc, 0x4d,
+	0x36, 0xa7, 0xd5, 0x44, 0x31, 0xa0, 0xd2, 0x43,
+	0x24, 0xb5, 0xc7, 0x56, 0x23, 0xb2, 0xc0, 0x51,
+	0x2a, 0xbb, 0xc9, 0x58, 0x2d, 0xbc, 0xce, 0x5f,
+
+	0x70, 0xe1, 0x93, 0x02, 0x77, 0xe6, 0x94, 0x05,
+	0x7e, 0xef, 0x9d, 0x0c, 0x79, 0xe8, 0x9a, 0x0b,
+	0x6c, 0xfd, 0x8f, 0x1e, 0x6b, 0xfa, 0x88, 0x19,
+	0x62, 0xf3, 0x81, 0x10, 0x65, 0xf4, 0x86, 0x17,
+
+	0x48, 0xd9, 0xab, 0x3a, 0x4f, 0xde, 0xac, 0x3d,
+	0x46, 0xd7, 0xa5, 0x34, 0x41, 0xd0, 0xa2, 0x33,
+	0x54, 0xc5, 0xb7, 0x26, 0x53, 0xc2, 0xb0, 0x21,
+	0x5a, 0xcb, 0xb9, 0x28, 0x5d, 0xcc, 0xbe, 0x2f,
+
+	0xe0, 0x71, 0x03, 0x92, 0xe7, 0x76, 0x04, 0x95,
+	0xee, 0x7f, 0x0d, 0x9c, 0xe9, 0x78, 0x0a, 0x9b,
+	0xfc, 0x6d, 0x1f, 0x8e, 0xfb, 0x6a, 0x18, 0x89,
+	0xf2, 0x63, 0x11, 0x80, 0xf5, 0x64, 0x16, 0x87,
+
+	0xd8, 0x49, 0x3b, 0xaa, 0xdf, 0x4e, 0x3c, 0xad,
+	0xd6, 0x47, 0x35, 0xa4, 0xd1, 0x40, 0x32, 0xa3,
+	0xc4, 0x55, 0x27, 0xb6, 0xc3, 0x52, 0x20, 0xb1,
+	0xca, 0x5b, 0x29, 0xb8, 0xcd, 0x5c, 0x2e, 0xbf,
+
+	0x90, 0x01, 0x73, 0xe2, 0x97, 0x06, 0x74, 0xe5,
+	0x9e, 0x0f, 0x7d, 0xec, 0x99, 0x08, 0x7a, 0xeb,
+	0x8c, 0x1d, 0x6f, 0xfe, 0x8b, 0x1a, 0x68, 0xf9,
+	0x82, 0x13, 0x61, 0xf0, 0x85, 0x14, 0x66, 0xf7,
+
+	0xa8, 0x39, 0x4b, 0xda, 0xaf, 0x3e, 0x4c, 0xdd,
+	0xa6, 0x37, 0x45, 0xd4, 0xa1, 0x30, 0x42, 0xd3,
+	0xb4, 0x25, 0x57, 0xc6, 0xb3, 0x22, 0x50, 0xc1,
+	0xba, 0x2b, 0x59, 0xc8, 0xbd, 0x2c, 0x5e, 0xcf
+};
+
+/* CRC on 2 bytes */
+#define __crc(data) (rfcomm_crc_table[rfcomm_crc_table[0xff ^ data[0]] ^ data[1]])
+
+/* FCS on 2 bytes */
+static inline u8 __fcs(u8 *data)
+{
+	return 0xff - __crc(data);
+}
+
+/* FCS on 3 bytes */
+static inline u8 __fcs2(u8 *data)
+{
+	return 0xff - rfcomm_crc_table[__crc(data) ^ data[2]];
+}
+
+/* Check FCS */
+static inline int __check_fcs(u8 *data, int type, u8 fcs)
+{
+	u8 f = __crc(data);
+
+	if (type != RFCOMM_UIH)
+		f = rfcomm_crc_table[f ^ data[2]];
+
+	return rfcomm_crc_table[f ^ fcs] != 0xcf;
+}
+
+/* ---- L2CAP callbacks ---- */
+static void rfcomm_l2state_change(struct sock *sk)
+{
+	BT_DBG("%p state %d", sk, sk->sk_state);
+	rfcomm_schedule();
+}
+
+static void rfcomm_l2data_ready(struct sock *sk)
+{
+	BT_DBG("%p", sk);
+	rfcomm_schedule();
+}
+
+static int rfcomm_l2sock_create(struct socket **sock)
+{
+	int err;
+
+	BT_DBG("");
+
+	err = sock_create_kern(&init_net, PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP, sock);
+	if (!err) {
+		struct sock *sk = (*sock)->sk;
+		sk->sk_data_ready   = rfcomm_l2data_ready;
+		sk->sk_state_change = rfcomm_l2state_change;
+	}
+	return err;
+}
+
+static int rfcomm_check_security(struct rfcomm_dlc *d)
+{
+	struct sock *sk = d->session->sock->sk;
+	struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn;
+
+	__u8 auth_type;
+
+	switch (d->sec_level) {
+	case BT_SECURITY_HIGH:
+	case BT_SECURITY_FIPS:
+		auth_type = HCI_AT_GENERAL_BONDING_MITM;
+		break;
+	case BT_SECURITY_MEDIUM:
+		auth_type = HCI_AT_GENERAL_BONDING;
+		break;
+	default:
+		auth_type = HCI_AT_NO_BONDING;
+		break;
+	}
+
+	return hci_conn_security(conn->hcon, d->sec_level, auth_type,
+				 d->out);
+}
+
+static void rfcomm_session_timeout(struct timer_list *t)
+{
+	struct rfcomm_session *s = from_timer(s, t, timer);
+
+	BT_DBG("session %p state %ld", s, s->state);
+
+	set_bit(RFCOMM_TIMED_OUT, &s->flags);
+	rfcomm_schedule();
+}
+
+static void rfcomm_session_set_timer(struct rfcomm_session *s, long timeout)
+{
+	BT_DBG("session %p state %ld timeout %ld", s, s->state, timeout);
+
+	mod_timer(&s->timer, jiffies + timeout);
+}
+
+static void rfcomm_session_clear_timer(struct rfcomm_session *s)
+{
+	BT_DBG("session %p state %ld", s, s->state);
+
+	del_timer_sync(&s->timer);
+}
+
+/* ---- RFCOMM DLCs ---- */
+static void rfcomm_dlc_timeout(struct timer_list *t)
+{
+	struct rfcomm_dlc *d = from_timer(d, t, timer);
+
+	BT_DBG("dlc %p state %ld", d, d->state);
+
+	set_bit(RFCOMM_TIMED_OUT, &d->flags);
+	rfcomm_dlc_put(d);
+	rfcomm_schedule();
+}
+
+static void rfcomm_dlc_set_timer(struct rfcomm_dlc *d, long timeout)
+{
+	BT_DBG("dlc %p state %ld timeout %ld", d, d->state, timeout);
+
+	if (!mod_timer(&d->timer, jiffies + timeout))
+		rfcomm_dlc_hold(d);
+}
+
+static void rfcomm_dlc_clear_timer(struct rfcomm_dlc *d)
+{
+	BT_DBG("dlc %p state %ld", d, d->state);
+
+	if (del_timer(&d->timer))
+		rfcomm_dlc_put(d);
+}
+
+static void rfcomm_dlc_clear_state(struct rfcomm_dlc *d)
+{
+	BT_DBG("%p", d);
+
+	d->state      = BT_OPEN;
+	d->flags      = 0;
+	d->mscex      = 0;
+	d->sec_level  = BT_SECURITY_LOW;
+	d->mtu        = RFCOMM_DEFAULT_MTU;
+	d->v24_sig    = RFCOMM_V24_RTC | RFCOMM_V24_RTR | RFCOMM_V24_DV;
+
+	d->cfc        = RFCOMM_CFC_DISABLED;
+	d->rx_credits = RFCOMM_DEFAULT_CREDITS;
+}
+
+struct rfcomm_dlc *rfcomm_dlc_alloc(gfp_t prio)
+{
+	struct rfcomm_dlc *d = kzalloc(sizeof(*d), prio);
+
+	if (!d)
+		return NULL;
+
+	timer_setup(&d->timer, rfcomm_dlc_timeout, 0);
+
+	skb_queue_head_init(&d->tx_queue);
+	mutex_init(&d->lock);
+	refcount_set(&d->refcnt, 1);
+
+	rfcomm_dlc_clear_state(d);
+
+	BT_DBG("%p", d);
+
+	return d;
+}
+
+void rfcomm_dlc_free(struct rfcomm_dlc *d)
+{
+	BT_DBG("%p", d);
+
+	skb_queue_purge(&d->tx_queue);
+	kfree(d);
+}
+
+static void rfcomm_dlc_link(struct rfcomm_session *s, struct rfcomm_dlc *d)
+{
+	BT_DBG("dlc %p session %p", d, s);
+
+	rfcomm_session_clear_timer(s);
+	rfcomm_dlc_hold(d);
+	list_add(&d->list, &s->dlcs);
+	d->session = s;
+}
+
+static void rfcomm_dlc_unlink(struct rfcomm_dlc *d)
+{
+	struct rfcomm_session *s = d->session;
+
+	BT_DBG("dlc %p refcnt %d session %p", d, refcount_read(&d->refcnt), s);
+
+	list_del(&d->list);
+	d->session = NULL;
+	rfcomm_dlc_put(d);
+
+	if (list_empty(&s->dlcs))
+		rfcomm_session_set_timer(s, RFCOMM_IDLE_TIMEOUT);
+}
+
+static struct rfcomm_dlc *rfcomm_dlc_get(struct rfcomm_session *s, u8 dlci)
+{
+	struct rfcomm_dlc *d;
+
+	list_for_each_entry(d, &s->dlcs, list)
+		if (d->dlci == dlci)
+			return d;
+
+	return NULL;
+}
+
+static int rfcomm_check_channel(u8 channel)
+{
+	return channel < 1 || channel > 30;
+}
+
+static int __rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel)
+{
+	struct rfcomm_session *s;
+	int err = 0;
+	u8 dlci;
+
+	BT_DBG("dlc %p state %ld %pMR -> %pMR channel %d",
+	       d, d->state, src, dst, channel);
+
+	if (rfcomm_check_channel(channel))
+		return -EINVAL;
+
+	if (d->state != BT_OPEN && d->state != BT_CLOSED)
+		return 0;
+
+	s = rfcomm_session_get(src, dst);
+	if (!s) {
+		s = rfcomm_session_create(src, dst, d->sec_level, &err);
+		if (!s)
+			return err;
+	}
+
+	dlci = __dlci(__session_dir(s), channel);
+
+	/* Check if DLCI already exists */
+	if (rfcomm_dlc_get(s, dlci))
+		return -EBUSY;
+
+	rfcomm_dlc_clear_state(d);
+
+	d->dlci     = dlci;
+	d->addr     = __addr(s->initiator, dlci);
+	d->priority = 7;
+
+	d->state = BT_CONFIG;
+	rfcomm_dlc_link(s, d);
+
+	d->out = 1;
+
+	d->mtu = s->mtu;
+	d->cfc = (s->cfc == RFCOMM_CFC_UNKNOWN) ? 0 : s->cfc;
+
+	if (s->state == BT_CONNECTED) {
+		if (rfcomm_check_security(d))
+			rfcomm_send_pn(s, 1, d);
+		else
+			set_bit(RFCOMM_AUTH_PENDING, &d->flags);
+	}
+
+	rfcomm_dlc_set_timer(d, RFCOMM_CONN_TIMEOUT);
+
+	return 0;
+}
+
+int rfcomm_dlc_open(struct rfcomm_dlc *d, bdaddr_t *src, bdaddr_t *dst, u8 channel)
+{
+	int r;
+
+	rfcomm_lock();
+
+	r = __rfcomm_dlc_open(d, src, dst, channel);
+
+	rfcomm_unlock();
+	return r;
+}
+
+static void __rfcomm_dlc_disconn(struct rfcomm_dlc *d)
+{
+	struct rfcomm_session *s = d->session;
+
+	d->state = BT_DISCONN;
+	if (skb_queue_empty(&d->tx_queue)) {
+		rfcomm_send_disc(s, d->dlci);
+		rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT);
+	} else {
+		rfcomm_queue_disc(d);
+		rfcomm_dlc_set_timer(d, RFCOMM_DISC_TIMEOUT * 2);
+	}
+}
+
+static int __rfcomm_dlc_close(struct rfcomm_dlc *d, int err)
+{
+	struct rfcomm_session *s = d->session;
+	if (!s)
+		return 0;
+
+	BT_DBG("dlc %p state %ld dlci %d err %d session %p",
+			d, d->state, d->dlci, err, s);
+
+	switch (d->state) {
+	case BT_CONNECT:
+	case BT_CONFIG:
+	case BT_OPEN:
+	case BT_CONNECT2:
+		if (test_and_clear_bit(RFCOMM_DEFER_SETUP, &d->flags)) {
+			set_bit(RFCOMM_AUTH_REJECT, &d->flags);
+			rfcomm_schedule();
+			return 0;
+		}
+	}
+
+	switch (d->state) {
+	case BT_CONNECT:
+	case BT_CONNECTED:
+		__rfcomm_dlc_disconn(d);
+		break;
+
+	case BT_CONFIG:
+		if (s->state != BT_BOUND) {
+			__rfcomm_dlc_disconn(d);
+			break;
+		}
+		/* if closing a dlc in a session that hasn't been started,
+		 * just close and unlink the dlc
+		 */
+
+	default:
+		rfcomm_dlc_clear_timer(d);
+
+		rfcomm_dlc_lock(d);
+		d->state = BT_CLOSED;
+		d->state_change(d, err);
+		rfcomm_dlc_unlock(d);
+
+		skb_queue_purge(&d->tx_queue);
+		rfcomm_dlc_unlink(d);
+	}
+
+	return 0;
+}
+
+int rfcomm_dlc_close(struct rfcomm_dlc *d, int err)
+{
+	int r = 0;
+	struct rfcomm_dlc *d_list;
+	struct rfcomm_session *s, *s_list;
+
+	BT_DBG("dlc %p state %ld dlci %d err %d", d, d->state, d->dlci, err);
+
+	rfcomm_lock();
+
+	s = d->session;
+	if (!s)
+		goto no_session;
+
+	/* after waiting on the mutex check the session still exists
+	 * then check the dlc still exists
+	 */
+	list_for_each_entry(s_list, &session_list, list) {
+		if (s_list == s) {
+			list_for_each_entry(d_list, &s->dlcs, list) {
+				if (d_list == d) {
+					r = __rfcomm_dlc_close(d, err);
+					break;
+				}
+			}
+			break;
+		}
+	}
+
+no_session:
+	rfcomm_unlock();
+	return r;
+}
+
+struct rfcomm_dlc *rfcomm_dlc_exists(bdaddr_t *src, bdaddr_t *dst, u8 channel)
+{
+	struct rfcomm_session *s;
+	struct rfcomm_dlc *dlc = NULL;
+	u8 dlci;
+
+	if (rfcomm_check_channel(channel))
+		return ERR_PTR(-EINVAL);
+
+	rfcomm_lock();
+	s = rfcomm_session_get(src, dst);
+	if (s) {
+		dlci = __dlci(__session_dir(s), channel);
+		dlc = rfcomm_dlc_get(s, dlci);
+	}
+	rfcomm_unlock();
+	return dlc;
+}
+
+int rfcomm_dlc_send(struct rfcomm_dlc *d, struct sk_buff *skb)
+{
+	int len = skb->len;
+
+	if (d->state != BT_CONNECTED)
+		return -ENOTCONN;
+
+	BT_DBG("dlc %p mtu %d len %d", d, d->mtu, len);
+
+	if (len > d->mtu)
+		return -EINVAL;
+
+	rfcomm_make_uih(skb, d->addr);
+	skb_queue_tail(&d->tx_queue, skb);
+
+	if (!test_bit(RFCOMM_TX_THROTTLED, &d->flags))
+		rfcomm_schedule();
+	return len;
+}
+
+void rfcomm_dlc_send_noerror(struct rfcomm_dlc *d, struct sk_buff *skb)
+{
+	int len = skb->len;
+
+	BT_DBG("dlc %p mtu %d len %d", d, d->mtu, len);
+
+	rfcomm_make_uih(skb, d->addr);
+	skb_queue_tail(&d->tx_queue, skb);
+
+	if (d->state == BT_CONNECTED &&
+	    !test_bit(RFCOMM_TX_THROTTLED, &d->flags))
+		rfcomm_schedule();
+}
+
+void __rfcomm_dlc_throttle(struct rfcomm_dlc *d)
+{
+	BT_DBG("dlc %p state %ld", d, d->state);
+
+	if (!d->cfc) {
+		d->v24_sig |= RFCOMM_V24_FC;
+		set_bit(RFCOMM_MSC_PENDING, &d->flags);
+	}
+	rfcomm_schedule();
+}
+
+void __rfcomm_dlc_unthrottle(struct rfcomm_dlc *d)
+{
+	BT_DBG("dlc %p state %ld", d, d->state);
+
+	if (!d->cfc) {
+		d->v24_sig &= ~RFCOMM_V24_FC;
+		set_bit(RFCOMM_MSC_PENDING, &d->flags);
+	}
+	rfcomm_schedule();
+}
+
+/*
+   Set/get modem status functions use _local_ status i.e. what we report
+   to the other side.
+   Remote status is provided by dlc->modem_status() callback.
+ */
+int rfcomm_dlc_set_modem_status(struct rfcomm_dlc *d, u8 v24_sig)
+{
+	BT_DBG("dlc %p state %ld v24_sig 0x%x",
+			d, d->state, v24_sig);
+
+	if (test_bit(RFCOMM_RX_THROTTLED, &d->flags))
+		v24_sig |= RFCOMM_V24_FC;
+	else
+		v24_sig &= ~RFCOMM_V24_FC;
+
+	d->v24_sig = v24_sig;
+
+	if (!test_and_set_bit(RFCOMM_MSC_PENDING, &d->flags))
+		rfcomm_schedule();
+
+	return 0;
+}
+
+int rfcomm_dlc_get_modem_status(struct rfcomm_dlc *d, u8 *v24_sig)
+{
+	BT_DBG("dlc %p state %ld v24_sig 0x%x",
+			d, d->state, d->v24_sig);
+
+	*v24_sig = d->v24_sig;
+	return 0;
+}
+
+/* ---- RFCOMM sessions ---- */
+static struct rfcomm_session *rfcomm_session_add(struct socket *sock, int state)
+{
+	struct rfcomm_session *s = kzalloc(sizeof(*s), GFP_KERNEL);
+
+	if (!s)
+		return NULL;
+
+	BT_DBG("session %p sock %p", s, sock);
+
+	timer_setup(&s->timer, rfcomm_session_timeout, 0);
+
+	INIT_LIST_HEAD(&s->dlcs);
+	s->state = state;
+	s->sock  = sock;
+
+	s->mtu = RFCOMM_DEFAULT_MTU;
+	s->cfc = disable_cfc ? RFCOMM_CFC_DISABLED : RFCOMM_CFC_UNKNOWN;
+
+	/* Do not increment module usage count for listening sessions.
+	 * Otherwise we won't be able to unload the module. */
+	if (state != BT_LISTEN)
+		if (!try_module_get(THIS_MODULE)) {
+			kfree(s);
+			return NULL;
+		}
+
+	list_add(&s->list, &session_list);
+
+	return s;
+}
+
+static struct rfcomm_session *rfcomm_session_del(struct rfcomm_session *s)
+{
+	int state = s->state;
+
+	BT_DBG("session %p state %ld", s, s->state);
+
+	list_del(&s->list);
+
+	rfcomm_session_clear_timer(s);
+	sock_release(s->sock);
+	kfree(s);
+
+	if (state != BT_LISTEN)
+		module_put(THIS_MODULE);
+
+	return NULL;
+}
+
+static struct rfcomm_session *rfcomm_session_get(bdaddr_t *src, bdaddr_t *dst)
+{
+	struct rfcomm_session *s, *n;
+	struct l2cap_chan *chan;
+	list_for_each_entry_safe(s, n, &session_list, list) {
+		chan = l2cap_pi(s->sock->sk)->chan;
+
+		if ((!bacmp(src, BDADDR_ANY) || !bacmp(&chan->src, src)) &&
+		    !bacmp(&chan->dst, dst))
+			return s;
+	}
+	return NULL;
+}
+
+static struct rfcomm_session *rfcomm_session_close(struct rfcomm_session *s,
+						   int err)
+{
+	struct rfcomm_dlc *d, *n;
+
+	s->state = BT_CLOSED;
+
+	BT_DBG("session %p state %ld err %d", s, s->state, err);
+
+	/* Close all dlcs */
+	list_for_each_entry_safe(d, n, &s->dlcs, list) {
+		d->state = BT_CLOSED;
+		__rfcomm_dlc_close(d, err);
+	}
+
+	rfcomm_session_clear_timer(s);
+	return rfcomm_session_del(s);
+}
+
+static struct rfcomm_session *rfcomm_session_create(bdaddr_t *src,
+							bdaddr_t *dst,
+							u8 sec_level,
+							int *err)
+{
+	struct rfcomm_session *s = NULL;
+	struct sockaddr_l2 addr;
+	struct socket *sock;
+	struct sock *sk;
+
+	BT_DBG("%pMR -> %pMR", src, dst);
+
+	*err = rfcomm_l2sock_create(&sock);
+	if (*err < 0)
+		return NULL;
+
+	bacpy(&addr.l2_bdaddr, src);
+	addr.l2_family = AF_BLUETOOTH;
+	addr.l2_psm    = 0;
+	addr.l2_cid    = 0;
+	addr.l2_bdaddr_type = BDADDR_BREDR;
+	*err = kernel_bind(sock, (struct sockaddr *) &addr, sizeof(addr));
+	if (*err < 0)
+		goto failed;
+
+	/* Set L2CAP options */
+	sk = sock->sk;
+	lock_sock(sk);
+	l2cap_pi(sk)->chan->imtu = l2cap_mtu;
+	l2cap_pi(sk)->chan->sec_level = sec_level;
+	if (l2cap_ertm)
+		l2cap_pi(sk)->chan->mode = L2CAP_MODE_ERTM;
+	release_sock(sk);
+
+	s = rfcomm_session_add(sock, BT_BOUND);
+	if (!s) {
+		*err = -ENOMEM;
+		goto failed;
+	}
+
+	s->initiator = 1;
+
+	bacpy(&addr.l2_bdaddr, dst);
+	addr.l2_family = AF_BLUETOOTH;
+	addr.l2_psm    = cpu_to_le16(L2CAP_PSM_RFCOMM);
+	addr.l2_cid    = 0;
+	addr.l2_bdaddr_type = BDADDR_BREDR;
+	*err = kernel_connect(sock, (struct sockaddr *) &addr, sizeof(addr), O_NONBLOCK);
+	if (*err == 0 || *err == -EINPROGRESS)
+		return s;
+
+	return rfcomm_session_del(s);
+
+failed:
+	sock_release(sock);
+	return NULL;
+}
+
+void rfcomm_session_getaddr(struct rfcomm_session *s, bdaddr_t *src, bdaddr_t *dst)
+{
+	struct l2cap_chan *chan = l2cap_pi(s->sock->sk)->chan;
+	if (src)
+		bacpy(src, &chan->src);
+	if (dst)
+		bacpy(dst, &chan->dst);
+}
+
+/* ---- RFCOMM frame sending ---- */
+static int rfcomm_send_frame(struct rfcomm_session *s, u8 *data, int len)
+{
+	struct kvec iv = { data, len };
+	struct msghdr msg;
+
+	BT_DBG("session %p len %d", s, len);
+
+	memset(&msg, 0, sizeof(msg));
+
+	return kernel_sendmsg(s->sock, &msg, &iv, 1, len);
+}
+
+static int rfcomm_send_cmd(struct rfcomm_session *s, struct rfcomm_cmd *cmd)
+{
+	BT_DBG("%p cmd %u", s, cmd->ctrl);
+
+	return rfcomm_send_frame(s, (void *) cmd, sizeof(*cmd));
+}
+
+static int rfcomm_send_sabm(struct rfcomm_session *s, u8 dlci)
+{
+	struct rfcomm_cmd cmd;
+
+	BT_DBG("%p dlci %d", s, dlci);
+
+	cmd.addr = __addr(s->initiator, dlci);
+	cmd.ctrl = __ctrl(RFCOMM_SABM, 1);
+	cmd.len  = __len8(0);
+	cmd.fcs  = __fcs2((u8 *) &cmd);
+
+	return rfcomm_send_cmd(s, &cmd);
+}
+
+static int rfcomm_send_ua(struct rfcomm_session *s, u8 dlci)
+{
+	struct rfcomm_cmd cmd;
+
+	BT_DBG("%p dlci %d", s, dlci);
+
+	cmd.addr = __addr(!s->initiator, dlci);
+	cmd.ctrl = __ctrl(RFCOMM_UA, 1);
+	cmd.len  = __len8(0);
+	cmd.fcs  = __fcs2((u8 *) &cmd);
+
+	return rfcomm_send_cmd(s, &cmd);
+}
+
+static int rfcomm_send_disc(struct rfcomm_session *s, u8 dlci)
+{
+	struct rfcomm_cmd cmd;
+
+	BT_DBG("%p dlci %d", s, dlci);
+
+	cmd.addr = __addr(s->initiator, dlci);
+	cmd.ctrl = __ctrl(RFCOMM_DISC, 1);
+	cmd.len  = __len8(0);
+	cmd.fcs  = __fcs2((u8 *) &cmd);
+
+	return rfcomm_send_cmd(s, &cmd);
+}
+
+static int rfcomm_queue_disc(struct rfcomm_dlc *d)
+{
+	struct rfcomm_cmd *cmd;
+	struct sk_buff *skb;
+
+	BT_DBG("dlc %p dlci %d", d, d->dlci);
+
+	skb = alloc_skb(sizeof(*cmd), GFP_KERNEL);
+	if (!skb)
+		return -ENOMEM;
+
+	cmd = __skb_put(skb, sizeof(*cmd));
+	cmd->addr = d->addr;
+	cmd->ctrl = __ctrl(RFCOMM_DISC, 1);
+	cmd->len  = __len8(0);
+	cmd->fcs  = __fcs2((u8 *) cmd);
+
+	skb_queue_tail(&d->tx_queue, skb);
+	rfcomm_schedule();
+	return 0;
+}
+
+static int rfcomm_send_dm(struct rfcomm_session *s, u8 dlci)
+{
+	struct rfcomm_cmd cmd;
+
+	BT_DBG("%p dlci %d", s, dlci);
+
+	cmd.addr = __addr(!s->initiator, dlci);
+	cmd.ctrl = __ctrl(RFCOMM_DM, 1);
+	cmd.len  = __len8(0);
+	cmd.fcs  = __fcs2((u8 *) &cmd);
+
+	return rfcomm_send_cmd(s, &cmd);
+}
+
+static int rfcomm_send_nsc(struct rfcomm_session *s, int cr, u8 type)
+{
+	struct rfcomm_hdr *hdr;
+	struct rfcomm_mcc *mcc;
+	u8 buf[16], *ptr = buf;
+
+	BT_DBG("%p cr %d type %d", s, cr, type);
+
+	hdr = (void *) ptr; ptr += sizeof(*hdr);
+	hdr->addr = __addr(s->initiator, 0);
+	hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
+	hdr->len  = __len8(sizeof(*mcc) + 1);
+
+	mcc = (void *) ptr; ptr += sizeof(*mcc);
+	mcc->type = __mcc_type(0, RFCOMM_NSC);
+	mcc->len  = __len8(1);
+
+	/* Type that we didn't like */
+	*ptr = __mcc_type(cr, type); ptr++;
+
+	*ptr = __fcs(buf); ptr++;
+
+	return rfcomm_send_frame(s, buf, ptr - buf);
+}
+
+static int rfcomm_send_pn(struct rfcomm_session *s, int cr, struct rfcomm_dlc *d)
+{
+	struct rfcomm_hdr *hdr;
+	struct rfcomm_mcc *mcc;
+	struct rfcomm_pn  *pn;
+	u8 buf[16], *ptr = buf;
+
+	BT_DBG("%p cr %d dlci %d mtu %d", s, cr, d->dlci, d->mtu);
+
+	hdr = (void *) ptr; ptr += sizeof(*hdr);
+	hdr->addr = __addr(s->initiator, 0);
+	hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
+	hdr->len  = __len8(sizeof(*mcc) + sizeof(*pn));
+
+	mcc = (void *) ptr; ptr += sizeof(*mcc);
+	mcc->type = __mcc_type(cr, RFCOMM_PN);
+	mcc->len  = __len8(sizeof(*pn));
+
+	pn = (void *) ptr; ptr += sizeof(*pn);
+	pn->dlci        = d->dlci;
+	pn->priority    = d->priority;
+	pn->ack_timer   = 0;
+	pn->max_retrans = 0;
+
+	if (s->cfc) {
+		pn->flow_ctrl = cr ? 0xf0 : 0xe0;
+		pn->credits = RFCOMM_DEFAULT_CREDITS;
+	} else {
+		pn->flow_ctrl = 0;
+		pn->credits   = 0;
+	}
+
+	if (cr && channel_mtu >= 0)
+		pn->mtu = cpu_to_le16(channel_mtu);
+	else
+		pn->mtu = cpu_to_le16(d->mtu);
+
+	*ptr = __fcs(buf); ptr++;
+
+	return rfcomm_send_frame(s, buf, ptr - buf);
+}
+
+int rfcomm_send_rpn(struct rfcomm_session *s, int cr, u8 dlci,
+			u8 bit_rate, u8 data_bits, u8 stop_bits,
+			u8 parity, u8 flow_ctrl_settings,
+			u8 xon_char, u8 xoff_char, u16 param_mask)
+{
+	struct rfcomm_hdr *hdr;
+	struct rfcomm_mcc *mcc;
+	struct rfcomm_rpn *rpn;
+	u8 buf[16], *ptr = buf;
+
+	BT_DBG("%p cr %d dlci %d bit_r 0x%x data_b 0x%x stop_b 0x%x parity 0x%x"
+			" flwc_s 0x%x xon_c 0x%x xoff_c 0x%x p_mask 0x%x",
+		s, cr, dlci, bit_rate, data_bits, stop_bits, parity,
+		flow_ctrl_settings, xon_char, xoff_char, param_mask);
+
+	hdr = (void *) ptr; ptr += sizeof(*hdr);
+	hdr->addr = __addr(s->initiator, 0);
+	hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
+	hdr->len  = __len8(sizeof(*mcc) + sizeof(*rpn));
+
+	mcc = (void *) ptr; ptr += sizeof(*mcc);
+	mcc->type = __mcc_type(cr, RFCOMM_RPN);
+	mcc->len  = __len8(sizeof(*rpn));
+
+	rpn = (void *) ptr; ptr += sizeof(*rpn);
+	rpn->dlci          = __addr(1, dlci);
+	rpn->bit_rate      = bit_rate;
+	rpn->line_settings = __rpn_line_settings(data_bits, stop_bits, parity);
+	rpn->flow_ctrl     = flow_ctrl_settings;
+	rpn->xon_char      = xon_char;
+	rpn->xoff_char     = xoff_char;
+	rpn->param_mask    = cpu_to_le16(param_mask);
+
+	*ptr = __fcs(buf); ptr++;
+
+	return rfcomm_send_frame(s, buf, ptr - buf);
+}
+
+static int rfcomm_send_rls(struct rfcomm_session *s, int cr, u8 dlci, u8 status)
+{
+	struct rfcomm_hdr *hdr;
+	struct rfcomm_mcc *mcc;
+	struct rfcomm_rls *rls;
+	u8 buf[16], *ptr = buf;
+
+	BT_DBG("%p cr %d status 0x%x", s, cr, status);
+
+	hdr = (void *) ptr; ptr += sizeof(*hdr);
+	hdr->addr = __addr(s->initiator, 0);
+	hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
+	hdr->len  = __len8(sizeof(*mcc) + sizeof(*rls));
+
+	mcc = (void *) ptr; ptr += sizeof(*mcc);
+	mcc->type = __mcc_type(cr, RFCOMM_RLS);
+	mcc->len  = __len8(sizeof(*rls));
+
+	rls = (void *) ptr; ptr += sizeof(*rls);
+	rls->dlci   = __addr(1, dlci);
+	rls->status = status;
+
+	*ptr = __fcs(buf); ptr++;
+
+	return rfcomm_send_frame(s, buf, ptr - buf);
+}
+
+static int rfcomm_send_msc(struct rfcomm_session *s, int cr, u8 dlci, u8 v24_sig)
+{
+	struct rfcomm_hdr *hdr;
+	struct rfcomm_mcc *mcc;
+	struct rfcomm_msc *msc;
+	u8 buf[16], *ptr = buf;
+
+	BT_DBG("%p cr %d v24 0x%x", s, cr, v24_sig);
+
+	hdr = (void *) ptr; ptr += sizeof(*hdr);
+	hdr->addr = __addr(s->initiator, 0);
+	hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
+	hdr->len  = __len8(sizeof(*mcc) + sizeof(*msc));
+
+	mcc = (void *) ptr; ptr += sizeof(*mcc);
+	mcc->type = __mcc_type(cr, RFCOMM_MSC);
+	mcc->len  = __len8(sizeof(*msc));
+
+	msc = (void *) ptr; ptr += sizeof(*msc);
+	msc->dlci    = __addr(1, dlci);
+	msc->v24_sig = v24_sig | 0x01;
+
+	*ptr = __fcs(buf); ptr++;
+
+	return rfcomm_send_frame(s, buf, ptr - buf);
+}
+
+static int rfcomm_send_fcoff(struct rfcomm_session *s, int cr)
+{
+	struct rfcomm_hdr *hdr;
+	struct rfcomm_mcc *mcc;
+	u8 buf[16], *ptr = buf;
+
+	BT_DBG("%p cr %d", s, cr);
+
+	hdr = (void *) ptr; ptr += sizeof(*hdr);
+	hdr->addr = __addr(s->initiator, 0);
+	hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
+	hdr->len  = __len8(sizeof(*mcc));
+
+	mcc = (void *) ptr; ptr += sizeof(*mcc);
+	mcc->type = __mcc_type(cr, RFCOMM_FCOFF);
+	mcc->len  = __len8(0);
+
+	*ptr = __fcs(buf); ptr++;
+
+	return rfcomm_send_frame(s, buf, ptr - buf);
+}
+
+static int rfcomm_send_fcon(struct rfcomm_session *s, int cr)
+{
+	struct rfcomm_hdr *hdr;
+	struct rfcomm_mcc *mcc;
+	u8 buf[16], *ptr = buf;
+
+	BT_DBG("%p cr %d", s, cr);
+
+	hdr = (void *) ptr; ptr += sizeof(*hdr);
+	hdr->addr = __addr(s->initiator, 0);
+	hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
+	hdr->len  = __len8(sizeof(*mcc));
+
+	mcc = (void *) ptr; ptr += sizeof(*mcc);
+	mcc->type = __mcc_type(cr, RFCOMM_FCON);
+	mcc->len  = __len8(0);
+
+	*ptr = __fcs(buf); ptr++;
+
+	return rfcomm_send_frame(s, buf, ptr - buf);
+}
+
+static int rfcomm_send_test(struct rfcomm_session *s, int cr, u8 *pattern, int len)
+{
+	struct socket *sock = s->sock;
+	struct kvec iv[3];
+	struct msghdr msg;
+	unsigned char hdr[5], crc[1];
+
+	if (len > 125)
+		return -EINVAL;
+
+	BT_DBG("%p cr %d", s, cr);
+
+	hdr[0] = __addr(s->initiator, 0);
+	hdr[1] = __ctrl(RFCOMM_UIH, 0);
+	hdr[2] = 0x01 | ((len + 2) << 1);
+	hdr[3] = 0x01 | ((cr & 0x01) << 1) | (RFCOMM_TEST << 2);
+	hdr[4] = 0x01 | (len << 1);
+
+	crc[0] = __fcs(hdr);
+
+	iv[0].iov_base = hdr;
+	iv[0].iov_len  = 5;
+	iv[1].iov_base = pattern;
+	iv[1].iov_len  = len;
+	iv[2].iov_base = crc;
+	iv[2].iov_len  = 1;
+
+	memset(&msg, 0, sizeof(msg));
+
+	return kernel_sendmsg(sock, &msg, iv, 3, 6 + len);
+}
+
+static int rfcomm_send_credits(struct rfcomm_session *s, u8 addr, u8 credits)
+{
+	struct rfcomm_hdr *hdr;
+	u8 buf[16], *ptr = buf;
+
+	BT_DBG("%p addr %d credits %d", s, addr, credits);
+
+	hdr = (void *) ptr; ptr += sizeof(*hdr);
+	hdr->addr = addr;
+	hdr->ctrl = __ctrl(RFCOMM_UIH, 1);
+	hdr->len  = __len8(0);
+
+	*ptr = credits; ptr++;
+
+	*ptr = __fcs(buf); ptr++;
+
+	return rfcomm_send_frame(s, buf, ptr - buf);
+}
+
+static void rfcomm_make_uih(struct sk_buff *skb, u8 addr)
+{
+	struct rfcomm_hdr *hdr;
+	int len = skb->len;
+	u8 *crc;
+
+	if (len > 127) {
+		hdr = skb_push(skb, 4);
+		put_unaligned(cpu_to_le16(__len16(len)), (__le16 *) &hdr->len);
+	} else {
+		hdr = skb_push(skb, 3);
+		hdr->len = __len8(len);
+	}
+	hdr->addr = addr;
+	hdr->ctrl = __ctrl(RFCOMM_UIH, 0);
+
+	crc = skb_put(skb, 1);
+	*crc = __fcs((void *) hdr);
+}
+
+/* ---- RFCOMM frame reception ---- */
+static struct rfcomm_session *rfcomm_recv_ua(struct rfcomm_session *s, u8 dlci)
+{
+	BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
+
+	if (dlci) {
+		/* Data channel */
+		struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci);
+		if (!d) {
+			rfcomm_send_dm(s, dlci);
+			return s;
+		}
+
+		switch (d->state) {
+		case BT_CONNECT:
+			rfcomm_dlc_clear_timer(d);
+
+			rfcomm_dlc_lock(d);
+			d->state = BT_CONNECTED;
+			d->state_change(d, 0);
+			rfcomm_dlc_unlock(d);
+
+			rfcomm_send_msc(s, 1, dlci, d->v24_sig);
+			break;
+
+		case BT_DISCONN:
+			d->state = BT_CLOSED;
+			__rfcomm_dlc_close(d, 0);
+
+			if (list_empty(&s->dlcs)) {
+				s->state = BT_DISCONN;
+				rfcomm_send_disc(s, 0);
+				rfcomm_session_clear_timer(s);
+			}
+
+			break;
+		}
+	} else {
+		/* Control channel */
+		switch (s->state) {
+		case BT_CONNECT:
+			s->state = BT_CONNECTED;
+			rfcomm_process_connect(s);
+			break;
+
+		case BT_DISCONN:
+			s = rfcomm_session_close(s, ECONNRESET);
+			break;
+		}
+	}
+	return s;
+}
+
+static struct rfcomm_session *rfcomm_recv_dm(struct rfcomm_session *s, u8 dlci)
+{
+	int err = 0;
+
+	BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
+
+	if (dlci) {
+		/* Data DLC */
+		struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci);
+		if (d) {
+			if (d->state == BT_CONNECT || d->state == BT_CONFIG)
+				err = ECONNREFUSED;
+			else
+				err = ECONNRESET;
+
+			d->state = BT_CLOSED;
+			__rfcomm_dlc_close(d, err);
+		}
+	} else {
+		if (s->state == BT_CONNECT)
+			err = ECONNREFUSED;
+		else
+			err = ECONNRESET;
+
+		s = rfcomm_session_close(s, err);
+	}
+	return s;
+}
+
+static struct rfcomm_session *rfcomm_recv_disc(struct rfcomm_session *s,
+					       u8 dlci)
+{
+	int err = 0;
+
+	BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
+
+	if (dlci) {
+		struct rfcomm_dlc *d = rfcomm_dlc_get(s, dlci);
+		if (d) {
+			rfcomm_send_ua(s, dlci);
+
+			if (d->state == BT_CONNECT || d->state == BT_CONFIG)
+				err = ECONNREFUSED;
+			else
+				err = ECONNRESET;
+
+			d->state = BT_CLOSED;
+			__rfcomm_dlc_close(d, err);
+		} else
+			rfcomm_send_dm(s, dlci);
+
+	} else {
+		rfcomm_send_ua(s, 0);
+
+		if (s->state == BT_CONNECT)
+			err = ECONNREFUSED;
+		else
+			err = ECONNRESET;
+
+		s = rfcomm_session_close(s, err);
+	}
+	return s;
+}
+
+void rfcomm_dlc_accept(struct rfcomm_dlc *d)
+{
+	struct sock *sk = d->session->sock->sk;
+	struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn;
+
+	BT_DBG("dlc %p", d);
+
+	rfcomm_send_ua(d->session, d->dlci);
+
+	rfcomm_dlc_clear_timer(d);
+
+	rfcomm_dlc_lock(d);
+	d->state = BT_CONNECTED;
+	d->state_change(d, 0);
+	rfcomm_dlc_unlock(d);
+
+	if (d->role_switch)
+		hci_conn_switch_role(conn->hcon, 0x00);
+
+	rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig);
+}
+
+static void rfcomm_check_accept(struct rfcomm_dlc *d)
+{
+	if (rfcomm_check_security(d)) {
+		if (d->defer_setup) {
+			set_bit(RFCOMM_DEFER_SETUP, &d->flags);
+			rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
+
+			rfcomm_dlc_lock(d);
+			d->state = BT_CONNECT2;
+			d->state_change(d, 0);
+			rfcomm_dlc_unlock(d);
+		} else
+			rfcomm_dlc_accept(d);
+	} else {
+		set_bit(RFCOMM_AUTH_PENDING, &d->flags);
+		rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
+	}
+}
+
+static int rfcomm_recv_sabm(struct rfcomm_session *s, u8 dlci)
+{
+	struct rfcomm_dlc *d;
+	u8 channel;
+
+	BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
+
+	if (!dlci) {
+		rfcomm_send_ua(s, 0);
+
+		if (s->state == BT_OPEN) {
+			s->state = BT_CONNECTED;
+			rfcomm_process_connect(s);
+		}
+		return 0;
+	}
+
+	/* Check if DLC exists */
+	d = rfcomm_dlc_get(s, dlci);
+	if (d) {
+		if (d->state == BT_OPEN) {
+			/* DLC was previously opened by PN request */
+			rfcomm_check_accept(d);
+		}
+		return 0;
+	}
+
+	/* Notify socket layer about incoming connection */
+	channel = __srv_channel(dlci);
+	if (rfcomm_connect_ind(s, channel, &d)) {
+		d->dlci = dlci;
+		d->addr = __addr(s->initiator, dlci);
+		rfcomm_dlc_link(s, d);
+
+		rfcomm_check_accept(d);
+	} else {
+		rfcomm_send_dm(s, dlci);
+	}
+
+	return 0;
+}
+
+static int rfcomm_apply_pn(struct rfcomm_dlc *d, int cr, struct rfcomm_pn *pn)
+{
+	struct rfcomm_session *s = d->session;
+
+	BT_DBG("dlc %p state %ld dlci %d mtu %d fc 0x%x credits %d",
+			d, d->state, d->dlci, pn->mtu, pn->flow_ctrl, pn->credits);
+
+	if ((pn->flow_ctrl == 0xf0 && s->cfc != RFCOMM_CFC_DISABLED) ||
+						pn->flow_ctrl == 0xe0) {
+		d->cfc = RFCOMM_CFC_ENABLED;
+		d->tx_credits = pn->credits;
+	} else {
+		d->cfc = RFCOMM_CFC_DISABLED;
+		set_bit(RFCOMM_TX_THROTTLED, &d->flags);
+	}
+
+	if (s->cfc == RFCOMM_CFC_UNKNOWN)
+		s->cfc = d->cfc;
+
+	d->priority = pn->priority;
+
+	d->mtu = __le16_to_cpu(pn->mtu);
+
+	if (cr && d->mtu > s->mtu)
+		d->mtu = s->mtu;
+
+	return 0;
+}
+
+static int rfcomm_recv_pn(struct rfcomm_session *s, int cr, struct sk_buff *skb)
+{
+	struct rfcomm_pn *pn = (void *) skb->data;
+	struct rfcomm_dlc *d;
+	u8 dlci = pn->dlci;
+
+	BT_DBG("session %p state %ld dlci %d", s, s->state, dlci);
+
+	if (!dlci)
+		return 0;
+
+	d = rfcomm_dlc_get(s, dlci);
+	if (d) {
+		if (cr) {
+			/* PN request */
+			rfcomm_apply_pn(d, cr, pn);
+			rfcomm_send_pn(s, 0, d);
+		} else {
+			/* PN response */
+			switch (d->state) {
+			case BT_CONFIG:
+				rfcomm_apply_pn(d, cr, pn);
+
+				d->state = BT_CONNECT;
+				rfcomm_send_sabm(s, d->dlci);
+				break;
+			}
+		}
+	} else {
+		u8 channel = __srv_channel(dlci);
+
+		if (!cr)
+			return 0;
+
+		/* PN request for non existing DLC.
+		 * Assume incoming connection. */
+		if (rfcomm_connect_ind(s, channel, &d)) {
+			d->dlci = dlci;
+			d->addr = __addr(s->initiator, dlci);
+			rfcomm_dlc_link(s, d);
+
+			rfcomm_apply_pn(d, cr, pn);
+
+			d->state = BT_OPEN;
+			rfcomm_send_pn(s, 0, d);
+		} else {
+			rfcomm_send_dm(s, dlci);
+		}
+	}
+	return 0;
+}
+
+static int rfcomm_recv_rpn(struct rfcomm_session *s, int cr, int len, struct sk_buff *skb)
+{
+	struct rfcomm_rpn *rpn = (void *) skb->data;
+	u8 dlci = __get_dlci(rpn->dlci);
+
+	u8 bit_rate  = 0;
+	u8 data_bits = 0;
+	u8 stop_bits = 0;
+	u8 parity    = 0;
+	u8 flow_ctrl = 0;
+	u8 xon_char  = 0;
+	u8 xoff_char = 0;
+	u16 rpn_mask = RFCOMM_RPN_PM_ALL;
+
+	BT_DBG("dlci %d cr %d len 0x%x bitr 0x%x line 0x%x flow 0x%x xonc 0x%x xoffc 0x%x pm 0x%x",
+		dlci, cr, len, rpn->bit_rate, rpn->line_settings, rpn->flow_ctrl,
+		rpn->xon_char, rpn->xoff_char, rpn->param_mask);
+
+	if (!cr)
+		return 0;
+
+	if (len == 1) {
+		/* This is a request, return default (according to ETSI TS 07.10) settings */
+		bit_rate  = RFCOMM_RPN_BR_9600;
+		data_bits = RFCOMM_RPN_DATA_8;
+		stop_bits = RFCOMM_RPN_STOP_1;
+		parity    = RFCOMM_RPN_PARITY_NONE;
+		flow_ctrl = RFCOMM_RPN_FLOW_NONE;
+		xon_char  = RFCOMM_RPN_XON_CHAR;
+		xoff_char = RFCOMM_RPN_XOFF_CHAR;
+		goto rpn_out;
+	}
+
+	/* Check for sane values, ignore/accept bit_rate, 8 bits, 1 stop bit,
+	 * no parity, no flow control lines, normal XON/XOFF chars */
+
+	if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_BITRATE)) {
+		bit_rate = rpn->bit_rate;
+		if (bit_rate > RFCOMM_RPN_BR_230400) {
+			BT_DBG("RPN bit rate mismatch 0x%x", bit_rate);
+			bit_rate = RFCOMM_RPN_BR_9600;
+			rpn_mask ^= RFCOMM_RPN_PM_BITRATE;
+		}
+	}
+
+	if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_DATA)) {
+		data_bits = __get_rpn_data_bits(rpn->line_settings);
+		if (data_bits != RFCOMM_RPN_DATA_8) {
+			BT_DBG("RPN data bits mismatch 0x%x", data_bits);
+			data_bits = RFCOMM_RPN_DATA_8;
+			rpn_mask ^= RFCOMM_RPN_PM_DATA;
+		}
+	}
+
+	if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_STOP)) {
+		stop_bits = __get_rpn_stop_bits(rpn->line_settings);
+		if (stop_bits != RFCOMM_RPN_STOP_1) {
+			BT_DBG("RPN stop bits mismatch 0x%x", stop_bits);
+			stop_bits = RFCOMM_RPN_STOP_1;
+			rpn_mask ^= RFCOMM_RPN_PM_STOP;
+		}
+	}
+
+	if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_PARITY)) {
+		parity = __get_rpn_parity(rpn->line_settings);
+		if (parity != RFCOMM_RPN_PARITY_NONE) {
+			BT_DBG("RPN parity mismatch 0x%x", parity);
+			parity = RFCOMM_RPN_PARITY_NONE;
+			rpn_mask ^= RFCOMM_RPN_PM_PARITY;
+		}
+	}
+
+	if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_FLOW)) {
+		flow_ctrl = rpn->flow_ctrl;
+		if (flow_ctrl != RFCOMM_RPN_FLOW_NONE) {
+			BT_DBG("RPN flow ctrl mismatch 0x%x", flow_ctrl);
+			flow_ctrl = RFCOMM_RPN_FLOW_NONE;
+			rpn_mask ^= RFCOMM_RPN_PM_FLOW;
+		}
+	}
+
+	if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_XON)) {
+		xon_char = rpn->xon_char;
+		if (xon_char != RFCOMM_RPN_XON_CHAR) {
+			BT_DBG("RPN XON char mismatch 0x%x", xon_char);
+			xon_char = RFCOMM_RPN_XON_CHAR;
+			rpn_mask ^= RFCOMM_RPN_PM_XON;
+		}
+	}
+
+	if (rpn->param_mask & cpu_to_le16(RFCOMM_RPN_PM_XOFF)) {
+		xoff_char = rpn->xoff_char;
+		if (xoff_char != RFCOMM_RPN_XOFF_CHAR) {
+			BT_DBG("RPN XOFF char mismatch 0x%x", xoff_char);
+			xoff_char = RFCOMM_RPN_XOFF_CHAR;
+			rpn_mask ^= RFCOMM_RPN_PM_XOFF;
+		}
+	}
+
+rpn_out:
+	rfcomm_send_rpn(s, 0, dlci, bit_rate, data_bits, stop_bits,
+			parity, flow_ctrl, xon_char, xoff_char, rpn_mask);
+
+	return 0;
+}
+
+static int rfcomm_recv_rls(struct rfcomm_session *s, int cr, struct sk_buff *skb)
+{
+	struct rfcomm_rls *rls = (void *) skb->data;
+	u8 dlci = __get_dlci(rls->dlci);
+
+	BT_DBG("dlci %d cr %d status 0x%x", dlci, cr, rls->status);
+
+	if (!cr)
+		return 0;
+
+	/* We should probably do something with this information here. But
+	 * for now it's sufficient just to reply -- Bluetooth 1.1 says it's
+	 * mandatory to recognise and respond to RLS */
+
+	rfcomm_send_rls(s, 0, dlci, rls->status);
+
+	return 0;
+}
+
+static int rfcomm_recv_msc(struct rfcomm_session *s, int cr, struct sk_buff *skb)
+{
+	struct rfcomm_msc *msc = (void *) skb->data;
+	struct rfcomm_dlc *d;
+	u8 dlci = __get_dlci(msc->dlci);
+
+	BT_DBG("dlci %d cr %d v24 0x%x", dlci, cr, msc->v24_sig);
+
+	d = rfcomm_dlc_get(s, dlci);
+	if (!d)
+		return 0;
+
+	if (cr) {
+		if (msc->v24_sig & RFCOMM_V24_FC && !d->cfc)
+			set_bit(RFCOMM_TX_THROTTLED, &d->flags);
+		else
+			clear_bit(RFCOMM_TX_THROTTLED, &d->flags);
+
+		rfcomm_dlc_lock(d);
+
+		d->remote_v24_sig = msc->v24_sig;
+
+		if (d->modem_status)
+			d->modem_status(d, msc->v24_sig);
+
+		rfcomm_dlc_unlock(d);
+
+		rfcomm_send_msc(s, 0, dlci, msc->v24_sig);
+
+		d->mscex |= RFCOMM_MSCEX_RX;
+	} else
+		d->mscex |= RFCOMM_MSCEX_TX;
+
+	return 0;
+}
+
+static int rfcomm_recv_mcc(struct rfcomm_session *s, struct sk_buff *skb)
+{
+	struct rfcomm_mcc *mcc = (void *) skb->data;
+	u8 type, cr, len;
+
+	cr   = __test_cr(mcc->type);
+	type = __get_mcc_type(mcc->type);
+	len  = __get_mcc_len(mcc->len);
+
+	BT_DBG("%p type 0x%x cr %d", s, type, cr);
+
+	skb_pull(skb, 2);
+
+	switch (type) {
+	case RFCOMM_PN:
+		rfcomm_recv_pn(s, cr, skb);
+		break;
+
+	case RFCOMM_RPN:
+		rfcomm_recv_rpn(s, cr, len, skb);
+		break;
+
+	case RFCOMM_RLS:
+		rfcomm_recv_rls(s, cr, skb);
+		break;
+
+	case RFCOMM_MSC:
+		rfcomm_recv_msc(s, cr, skb);
+		break;
+
+	case RFCOMM_FCOFF:
+		if (cr) {
+			set_bit(RFCOMM_TX_THROTTLED, &s->flags);
+			rfcomm_send_fcoff(s, 0);
+		}
+		break;
+
+	case RFCOMM_FCON:
+		if (cr) {
+			clear_bit(RFCOMM_TX_THROTTLED, &s->flags);
+			rfcomm_send_fcon(s, 0);
+		}
+		break;
+
+	case RFCOMM_TEST:
+		if (cr)
+			rfcomm_send_test(s, 0, skb->data, skb->len);
+		break;
+
+	case RFCOMM_NSC:
+		break;
+
+	default:
+		BT_ERR("Unknown control type 0x%02x", type);
+		rfcomm_send_nsc(s, cr, type);
+		break;
+	}
+	return 0;
+}
+
+static int rfcomm_recv_data(struct rfcomm_session *s, u8 dlci, int pf, struct sk_buff *skb)
+{
+	struct rfcomm_dlc *d;
+
+	BT_DBG("session %p state %ld dlci %d pf %d", s, s->state, dlci, pf);
+
+	d = rfcomm_dlc_get(s, dlci);
+	if (!d) {
+		rfcomm_send_dm(s, dlci);
+		goto drop;
+	}
+
+	if (pf && d->cfc) {
+		u8 credits = *(u8 *) skb->data; skb_pull(skb, 1);
+
+		d->tx_credits += credits;
+		if (d->tx_credits)
+			clear_bit(RFCOMM_TX_THROTTLED, &d->flags);
+	}
+
+	if (skb->len && d->state == BT_CONNECTED) {
+		rfcomm_dlc_lock(d);
+		d->rx_credits--;
+		d->data_ready(d, skb);
+		rfcomm_dlc_unlock(d);
+		return 0;
+	}
+
+drop:
+	kfree_skb(skb);
+	return 0;
+}
+
+static struct rfcomm_session *rfcomm_recv_frame(struct rfcomm_session *s,
+						struct sk_buff *skb)
+{
+	struct rfcomm_hdr *hdr = (void *) skb->data;
+	u8 type, dlci, fcs;
+
+	if (!s) {
+		/* no session, so free socket data */
+		kfree_skb(skb);
+		return s;
+	}
+
+	dlci = __get_dlci(hdr->addr);
+	type = __get_type(hdr->ctrl);
+
+	/* Trim FCS */
+	skb->len--; skb->tail--;
+	fcs = *(u8 *)skb_tail_pointer(skb);
+
+	if (__check_fcs(skb->data, type, fcs)) {
+		BT_ERR("bad checksum in packet");
+		kfree_skb(skb);
+		return s;
+	}
+
+	if (__test_ea(hdr->len))
+		skb_pull(skb, 3);
+	else
+		skb_pull(skb, 4);
+
+	switch (type) {
+	case RFCOMM_SABM:
+		if (__test_pf(hdr->ctrl))
+			rfcomm_recv_sabm(s, dlci);
+		break;
+
+	case RFCOMM_DISC:
+		if (__test_pf(hdr->ctrl))
+			s = rfcomm_recv_disc(s, dlci);
+		break;
+
+	case RFCOMM_UA:
+		if (__test_pf(hdr->ctrl))
+			s = rfcomm_recv_ua(s, dlci);
+		break;
+
+	case RFCOMM_DM:
+		s = rfcomm_recv_dm(s, dlci);
+		break;
+
+	case RFCOMM_UIH:
+		if (dlci) {
+			rfcomm_recv_data(s, dlci, __test_pf(hdr->ctrl), skb);
+			return s;
+		}
+		rfcomm_recv_mcc(s, skb);
+		break;
+
+	default:
+		BT_ERR("Unknown packet type 0x%02x", type);
+		break;
+	}
+	kfree_skb(skb);
+	return s;
+}
+
+/* ---- Connection and data processing ---- */
+
+static void rfcomm_process_connect(struct rfcomm_session *s)
+{
+	struct rfcomm_dlc *d, *n;
+
+	BT_DBG("session %p state %ld", s, s->state);
+
+	list_for_each_entry_safe(d, n, &s->dlcs, list) {
+		if (d->state == BT_CONFIG) {
+			d->mtu = s->mtu;
+			if (rfcomm_check_security(d)) {
+				rfcomm_send_pn(s, 1, d);
+			} else {
+				set_bit(RFCOMM_AUTH_PENDING, &d->flags);
+				rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
+			}
+		}
+	}
+}
+
+/* Send data queued for the DLC.
+ * Return number of frames left in the queue.
+ */
+static int rfcomm_process_tx(struct rfcomm_dlc *d)
+{
+	struct sk_buff *skb;
+	int err;
+
+	BT_DBG("dlc %p state %ld cfc %d rx_credits %d tx_credits %d",
+			d, d->state, d->cfc, d->rx_credits, d->tx_credits);
+
+	/* Send pending MSC */
+	if (test_and_clear_bit(RFCOMM_MSC_PENDING, &d->flags))
+		rfcomm_send_msc(d->session, 1, d->dlci, d->v24_sig);
+
+	if (d->cfc) {
+		/* CFC enabled.
+		 * Give them some credits */
+		if (!test_bit(RFCOMM_RX_THROTTLED, &d->flags) &&
+				d->rx_credits <= (d->cfc >> 2)) {
+			rfcomm_send_credits(d->session, d->addr, d->cfc - d->rx_credits);
+			d->rx_credits = d->cfc;
+		}
+	} else {
+		/* CFC disabled.
+		 * Give ourselves some credits */
+		d->tx_credits = 5;
+	}
+
+	if (test_bit(RFCOMM_TX_THROTTLED, &d->flags))
+		return skb_queue_len(&d->tx_queue);
+
+	while (d->tx_credits && (skb = skb_dequeue(&d->tx_queue))) {
+		err = rfcomm_send_frame(d->session, skb->data, skb->len);
+		if (err < 0) {
+			skb_queue_head(&d->tx_queue, skb);
+			break;
+		}
+		kfree_skb(skb);
+		d->tx_credits--;
+	}
+
+	if (d->cfc && !d->tx_credits) {
+		/* We're out of TX credits.
+		 * Set TX_THROTTLED flag to avoid unnesary wakeups by dlc_send. */
+		set_bit(RFCOMM_TX_THROTTLED, &d->flags);
+	}
+
+	return skb_queue_len(&d->tx_queue);
+}
+
+static void rfcomm_process_dlcs(struct rfcomm_session *s)
+{
+	struct rfcomm_dlc *d, *n;
+
+	BT_DBG("session %p state %ld", s, s->state);
+
+	list_for_each_entry_safe(d, n, &s->dlcs, list) {
+		if (test_bit(RFCOMM_TIMED_OUT, &d->flags)) {
+			__rfcomm_dlc_close(d, ETIMEDOUT);
+			continue;
+		}
+
+		if (test_bit(RFCOMM_ENC_DROP, &d->flags)) {
+			__rfcomm_dlc_close(d, ECONNREFUSED);
+			continue;
+		}
+
+		if (test_and_clear_bit(RFCOMM_AUTH_ACCEPT, &d->flags)) {
+			rfcomm_dlc_clear_timer(d);
+			if (d->out) {
+				rfcomm_send_pn(s, 1, d);
+				rfcomm_dlc_set_timer(d, RFCOMM_CONN_TIMEOUT);
+			} else {
+				if (d->defer_setup) {
+					set_bit(RFCOMM_DEFER_SETUP, &d->flags);
+					rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
+
+					rfcomm_dlc_lock(d);
+					d->state = BT_CONNECT2;
+					d->state_change(d, 0);
+					rfcomm_dlc_unlock(d);
+				} else
+					rfcomm_dlc_accept(d);
+			}
+			continue;
+		} else if (test_and_clear_bit(RFCOMM_AUTH_REJECT, &d->flags)) {
+			rfcomm_dlc_clear_timer(d);
+			if (!d->out)
+				rfcomm_send_dm(s, d->dlci);
+			else
+				d->state = BT_CLOSED;
+			__rfcomm_dlc_close(d, ECONNREFUSED);
+			continue;
+		}
+
+		if (test_bit(RFCOMM_SEC_PENDING, &d->flags))
+			continue;
+
+		if (test_bit(RFCOMM_TX_THROTTLED, &s->flags))
+			continue;
+
+		if ((d->state == BT_CONNECTED || d->state == BT_DISCONN) &&
+						d->mscex == RFCOMM_MSCEX_OK)
+			rfcomm_process_tx(d);
+	}
+}
+
+static struct rfcomm_session *rfcomm_process_rx(struct rfcomm_session *s)
+{
+	struct socket *sock = s->sock;
+	struct sock *sk = sock->sk;
+	struct sk_buff *skb;
+
+	BT_DBG("session %p state %ld qlen %d", s, s->state, skb_queue_len(&sk->sk_receive_queue));
+
+	/* Get data directly from socket receive queue without copying it. */
+	while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
+		skb_orphan(skb);
+		if (!skb_linearize(skb)) {
+			s = rfcomm_recv_frame(s, skb);
+			if (!s)
+				break;
+		} else {
+			kfree_skb(skb);
+		}
+	}
+
+	if (s && (sk->sk_state == BT_CLOSED))
+		s = rfcomm_session_close(s, sk->sk_err);
+
+	return s;
+}
+
+static void rfcomm_accept_connection(struct rfcomm_session *s)
+{
+	struct socket *sock = s->sock, *nsock;
+	int err;
+
+	/* Fast check for a new connection.
+	 * Avoids unnesesary socket allocations. */
+	if (list_empty(&bt_sk(sock->sk)->accept_q))
+		return;
+
+	BT_DBG("session %p", s);
+
+	err = kernel_accept(sock, &nsock, O_NONBLOCK);
+	if (err < 0)
+		return;
+
+	/* Set our callbacks */
+	nsock->sk->sk_data_ready   = rfcomm_l2data_ready;
+	nsock->sk->sk_state_change = rfcomm_l2state_change;
+
+	s = rfcomm_session_add(nsock, BT_OPEN);
+	if (s) {
+		/* We should adjust MTU on incoming sessions.
+		 * L2CAP MTU minus UIH header and FCS. */
+		s->mtu = min(l2cap_pi(nsock->sk)->chan->omtu,
+				l2cap_pi(nsock->sk)->chan->imtu) - 5;
+
+		rfcomm_schedule();
+	} else
+		sock_release(nsock);
+}
+
+static struct rfcomm_session *rfcomm_check_connection(struct rfcomm_session *s)
+{
+	struct sock *sk = s->sock->sk;
+
+	BT_DBG("%p state %ld", s, s->state);
+
+	switch (sk->sk_state) {
+	case BT_CONNECTED:
+		s->state = BT_CONNECT;
+
+		/* We can adjust MTU on outgoing sessions.
+		 * L2CAP MTU minus UIH header and FCS. */
+		s->mtu = min(l2cap_pi(sk)->chan->omtu, l2cap_pi(sk)->chan->imtu) - 5;
+
+		rfcomm_send_sabm(s, 0);
+		break;
+
+	case BT_CLOSED:
+		s = rfcomm_session_close(s, sk->sk_err);
+		break;
+	}
+	return s;
+}
+
+static void rfcomm_process_sessions(void)
+{
+	struct rfcomm_session *s, *n;
+
+	rfcomm_lock();
+
+	list_for_each_entry_safe(s, n, &session_list, list) {
+		if (test_and_clear_bit(RFCOMM_TIMED_OUT, &s->flags)) {
+			s->state = BT_DISCONN;
+			rfcomm_send_disc(s, 0);
+			continue;
+		}
+
+		switch (s->state) {
+		case BT_LISTEN:
+			rfcomm_accept_connection(s);
+			continue;
+
+		case BT_BOUND:
+			s = rfcomm_check_connection(s);
+			break;
+
+		default:
+			s = rfcomm_process_rx(s);
+			break;
+		}
+
+		if (s)
+			rfcomm_process_dlcs(s);
+	}
+
+	rfcomm_unlock();
+}
+
+static int rfcomm_add_listener(bdaddr_t *ba)
+{
+	struct sockaddr_l2 addr;
+	struct socket *sock;
+	struct sock *sk;
+	struct rfcomm_session *s;
+	int    err = 0;
+
+	/* Create socket */
+	err = rfcomm_l2sock_create(&sock);
+	if (err < 0) {
+		BT_ERR("Create socket failed %d", err);
+		return err;
+	}
+
+	/* Bind socket */
+	bacpy(&addr.l2_bdaddr, ba);
+	addr.l2_family = AF_BLUETOOTH;
+	addr.l2_psm    = cpu_to_le16(L2CAP_PSM_RFCOMM);
+	addr.l2_cid    = 0;
+	addr.l2_bdaddr_type = BDADDR_BREDR;
+	err = kernel_bind(sock, (struct sockaddr *) &addr, sizeof(addr));
+	if (err < 0) {
+		BT_ERR("Bind failed %d", err);
+		goto failed;
+	}
+
+	/* Set L2CAP options */
+	sk = sock->sk;
+	lock_sock(sk);
+	l2cap_pi(sk)->chan->imtu = l2cap_mtu;
+	release_sock(sk);
+
+	/* Start listening on the socket */
+	err = kernel_listen(sock, 10);
+	if (err) {
+		BT_ERR("Listen failed %d", err);
+		goto failed;
+	}
+
+	/* Add listening session */
+	s = rfcomm_session_add(sock, BT_LISTEN);
+	if (!s) {
+		err = -ENOMEM;
+		goto failed;
+	}
+
+	return 0;
+failed:
+	sock_release(sock);
+	return err;
+}
+
+static void rfcomm_kill_listener(void)
+{
+	struct rfcomm_session *s, *n;
+
+	BT_DBG("");
+
+	list_for_each_entry_safe(s, n, &session_list, list)
+		rfcomm_session_del(s);
+}
+
+static int rfcomm_run(void *unused)
+{
+	DEFINE_WAIT_FUNC(wait, woken_wake_function);
+	BT_DBG("");
+
+	set_user_nice(current, -10);
+
+	rfcomm_add_listener(BDADDR_ANY);
+
+	add_wait_queue(&rfcomm_wq, &wait);
+	while (!kthread_should_stop()) {
+
+		/* Process stuff */
+		rfcomm_process_sessions();
+
+		wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
+	}
+	remove_wait_queue(&rfcomm_wq, &wait);
+
+	rfcomm_kill_listener();
+
+	return 0;
+}
+
+static void rfcomm_security_cfm(struct hci_conn *conn, u8 status, u8 encrypt)
+{
+	struct rfcomm_session *s;
+	struct rfcomm_dlc *d, *n;
+
+	BT_DBG("conn %p status 0x%02x encrypt 0x%02x", conn, status, encrypt);
+
+	s = rfcomm_session_get(&conn->hdev->bdaddr, &conn->dst);
+	if (!s)
+		return;
+
+	list_for_each_entry_safe(d, n, &s->dlcs, list) {
+		if (test_and_clear_bit(RFCOMM_SEC_PENDING, &d->flags)) {
+			rfcomm_dlc_clear_timer(d);
+			if (status || encrypt == 0x00) {
+				set_bit(RFCOMM_ENC_DROP, &d->flags);
+				continue;
+			}
+		}
+
+		if (d->state == BT_CONNECTED && !status && encrypt == 0x00) {
+			if (d->sec_level == BT_SECURITY_MEDIUM) {
+				set_bit(RFCOMM_SEC_PENDING, &d->flags);
+				rfcomm_dlc_set_timer(d, RFCOMM_AUTH_TIMEOUT);
+				continue;
+			} else if (d->sec_level == BT_SECURITY_HIGH ||
+				   d->sec_level == BT_SECURITY_FIPS) {
+				set_bit(RFCOMM_ENC_DROP, &d->flags);
+				continue;
+			}
+		}
+
+		if (!test_and_clear_bit(RFCOMM_AUTH_PENDING, &d->flags))
+			continue;
+
+		if (!status && hci_conn_check_secure(conn, d->sec_level))
+			set_bit(RFCOMM_AUTH_ACCEPT, &d->flags);
+		else
+			set_bit(RFCOMM_AUTH_REJECT, &d->flags);
+	}
+
+	rfcomm_schedule();
+}
+
+static struct hci_cb rfcomm_cb = {
+	.name		= "RFCOMM",
+	.security_cfm	= rfcomm_security_cfm
+};
+
+static int rfcomm_dlc_debugfs_show(struct seq_file *f, void *x)
+{
+	struct rfcomm_session *s;
+
+	rfcomm_lock();
+
+	list_for_each_entry(s, &session_list, list) {
+		struct l2cap_chan *chan = l2cap_pi(s->sock->sk)->chan;
+		struct rfcomm_dlc *d;
+		list_for_each_entry(d, &s->dlcs, list) {
+			seq_printf(f, "%pMR %pMR %ld %d %d %d %d\n",
+				   &chan->src, &chan->dst,
+				   d->state, d->dlci, d->mtu,
+				   d->rx_credits, d->tx_credits);
+		}
+	}
+
+	rfcomm_unlock();
+
+	return 0;
+}
+
+static int rfcomm_dlc_debugfs_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, rfcomm_dlc_debugfs_show, inode->i_private);
+}
+
+static const struct file_operations rfcomm_dlc_debugfs_fops = {
+	.open		= rfcomm_dlc_debugfs_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+static struct dentry *rfcomm_dlc_debugfs;
+
+/* ---- Initialization ---- */
+static int __init rfcomm_init(void)
+{
+	int err;
+
+	hci_register_cb(&rfcomm_cb);
+
+	rfcomm_thread = kthread_run(rfcomm_run, NULL, "krfcommd");
+	if (IS_ERR(rfcomm_thread)) {
+		err = PTR_ERR(rfcomm_thread);
+		goto unregister;
+	}
+
+	err = rfcomm_init_ttys();
+	if (err < 0)
+		goto stop;
+
+	err = rfcomm_init_sockets();
+	if (err < 0)
+		goto cleanup;
+
+	BT_INFO("RFCOMM ver %s", VERSION);
+
+	if (IS_ERR_OR_NULL(bt_debugfs))
+		return 0;
+
+	rfcomm_dlc_debugfs = debugfs_create_file("rfcomm_dlc", 0444,
+						 bt_debugfs, NULL,
+						 &rfcomm_dlc_debugfs_fops);
+
+	return 0;
+
+cleanup:
+	rfcomm_cleanup_ttys();
+
+stop:
+	kthread_stop(rfcomm_thread);
+
+unregister:
+	hci_unregister_cb(&rfcomm_cb);
+
+	return err;
+}
+
+static void __exit rfcomm_exit(void)
+{
+	debugfs_remove(rfcomm_dlc_debugfs);
+
+	hci_unregister_cb(&rfcomm_cb);
+
+	kthread_stop(rfcomm_thread);
+
+	rfcomm_cleanup_ttys();
+
+	rfcomm_cleanup_sockets();
+}
+
+module_init(rfcomm_init);
+module_exit(rfcomm_exit);
+
+module_param(disable_cfc, bool, 0644);
+MODULE_PARM_DESC(disable_cfc, "Disable credit based flow control");
+
+module_param(channel_mtu, int, 0644);
+MODULE_PARM_DESC(channel_mtu, "Default MTU for the RFCOMM channel");
+
+module_param(l2cap_mtu, uint, 0644);
+MODULE_PARM_DESC(l2cap_mtu, "Default MTU for the L2CAP connection");
+
+module_param(l2cap_ertm, bool, 0644);
+MODULE_PARM_DESC(l2cap_ertm, "Use L2CAP ERTM mode for connection");
+
+MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
+MODULE_DESCRIPTION("Bluetooth RFCOMM ver " VERSION);
+MODULE_VERSION(VERSION);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("bt-proto-3");