Bluetooth: Rename l2cap.c to l2cap_core.c

In a preparation to the the L2CAP code split in many files.

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

1 files changed, 4984 insertions, 0 deletions

diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
new file mode 100644
index 000000000000..28d2954f94a4
--- /dev/null
+++ b/net/bluetooth/l2cap_core.c
@@ -0,0 +1,4984 @@
+/*
+   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 core and sockets. */
+
+#include <linux/module.h>
+
+#include <linux/types.h>
+#include <linux/capability.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/poll.h>
+#include <linux/fcntl.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/socket.h>
+#include <linux/skbuff.h>
+#include <linux/list.h>
+#include <linux/device.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include <linux/uaccess.h>
+#include <linux/crc16.h>
+#include <net/sock.h>
+
+#include <asm/system.h>
+#include <asm/unaligned.h>
+
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
+#include <net/bluetooth/l2cap.h>
+
+#define VERSION "2.15"
+
+static 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 = {
+	.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,
+				u8 code, u8 ident, u16 dlen, void *data);
+
+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)
+{
+	BT_DBG("sk %p state %d timeout %ld", sk, sk->sk_state, timeout);
+	sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout);
+}
+
+static void l2cap_sock_clear_timer(struct sock *sk)
+{
+	BT_DBG("sock %p state %d", sk, sk->sk_state);
+	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)
+{
+	struct sock *s;
+	for (s = l->head; s; s = l2cap_pi(s)->next_c) {
+		if (l2cap_pi(s)->dcid == cid)
+			break;
+	}
+	return s;
+}
+
+static struct sock *__l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid)
+{
+	struct sock *s;
+	for (s = l->head; s; s = l2cap_pi(s)->next_c) {
+		if (l2cap_pi(s)->scid == cid)
+			break;
+	}
+	return s;
+}
+
+/* Find channel with given SCID.
+ * Returns locked socket */
+static inline struct sock *l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid)
+{
+	struct sock *s;
+	read_lock(&l->lock);
+	s = __l2cap_get_chan_by_scid(l, cid);
+	if (s)
+		bh_lock_sock(s);
+	read_unlock(&l->lock);
+	return s;
+}
+
+static struct sock *__l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident)
+{
+	struct sock *s;
+	for (s = l->head; s; s = l2cap_pi(s)->next_c) {
+		if (l2cap_pi(s)->ident == ident)
+			break;
+	}
+	return s;
+}
+
+static inline struct sock *l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident)
+{
+	struct sock *s;
+	read_lock(&l->lock);
+	s = __l2cap_get_chan_by_ident(l, ident);
+	if (s)
+		bh_lock_sock(s);
+	read_unlock(&l->lock);
+	return s;
+}
+
+static u16 l2cap_alloc_cid(struct l2cap_chan_list *l)
+{
+	u16 cid = L2CAP_CID_DYN_START;
+
+	for (; cid < L2CAP_CID_DYN_END; cid++) {
+		if (!__l2cap_get_chan_by_scid(l, cid))
+			return cid;
+	}
+
+	return 0;
+}
+
+static inline void __l2cap_chan_link(struct l2cap_chan_list *l, struct sock *sk)
+{
+	sock_hold(sk);
+
+	if (l->head)
+		l2cap_pi(l->head)->prev_c = sk;
+
+	l2cap_pi(sk)->next_c = l->head;
+	l2cap_pi(sk)->prev_c = NULL;
+	l->head = sk;
+}
+
+static inline void l2cap_chan_unlink(struct l2cap_chan_list *l, struct sock *sk)
+{
+	struct sock *next = l2cap_pi(sk)->next_c, *prev = l2cap_pi(sk)->prev_c;
+
+	write_lock_bh(&l->lock);
+	if (sk == l->head)
+		l->head = next;
+
+	if (next)
+		l2cap_pi(next)->prev_c = prev;
+	if (prev)
+		l2cap_pi(prev)->next_c = next;
+	write_unlock_bh(&l->lock);
+
+	__sock_put(sk);
+}
+
+static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent)
+{
+	struct l2cap_chan_list *l = &conn->chan_list;
+
+	BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
+			l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid);
+
+	conn->disc_reason = 0x13;
+
+	l2cap_pi(sk)->conn = conn;
+
+	if (sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) {
+		/* Alloc CID for connection-oriented socket */
+		l2cap_pi(sk)->scid = l2cap_alloc_cid(l);
+	} else if (sk->sk_type == SOCK_DGRAM) {
+		/* Connectionless socket */
+		l2cap_pi(sk)->scid = L2CAP_CID_CONN_LESS;
+		l2cap_pi(sk)->dcid = L2CAP_CID_CONN_LESS;
+		l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU;
+	} else {
+		/* Raw socket can send/recv signalling messages only */
+		l2cap_pi(sk)->scid = L2CAP_CID_SIGNALING;
+		l2cap_pi(sk)->dcid = L2CAP_CID_SIGNALING;
+		l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU;
+	}
+
+	__l2cap_chan_link(l, sk);
+
+	if (parent)
+		bt_accept_enqueue(parent, sk);
+}
+
+/* Delete channel.
+ * Must be called on the locked socket. */
+static void l2cap_chan_del(struct sock *sk, int err)
+{
+	struct l2cap_conn *conn = l2cap_pi(sk)->conn;
+	struct sock *parent = bt_sk(sk)->parent;
+
+	l2cap_sock_clear_timer(sk);
+
+	BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
+
+	if (conn) {
+		/* Unlink from channel list */
+		l2cap_chan_unlink(&conn->chan_list, sk);
+		l2cap_pi(sk)->conn = NULL;
+		hci_conn_put(conn->hcon);
+	}
+
+	sk->sk_state = BT_CLOSED;
+	sock_set_flag(sk, SOCK_ZAPPED);
+
+	if (err)
+		sk->sk_err = err;
+
+	if (parent) {
+		bt_accept_unlink(sk);
+		parent->sk_data_ready(parent, 0);
+	} else
+		sk->sk_state_change(sk);
+
+	skb_queue_purge(TX_QUEUE(sk));
+
+	if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) {
+		struct srej_list *l, *tmp;
+
+		del_timer(&l2cap_pi(sk)->retrans_timer);
+		del_timer(&l2cap_pi(sk)->monitor_timer);
+		del_timer(&l2cap_pi(sk)->ack_timer);
+
+		skb_queue_purge(SREJ_QUEUE(sk));
+		skb_queue_purge(BUSY_QUEUE(sk));
+
+		list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) {
+			list_del(&l->list);
+			kfree(l);
+		}
+	}
+}
+
+static inline u8 l2cap_get_auth_type(struct sock *sk)
+{
+	if (sk->sk_type == SOCK_RAW) {
+		switch (l2cap_pi(sk)->sec_level) {
+		case BT_SECURITY_HIGH:
+			return HCI_AT_DEDICATED_BONDING_MITM;
+		case BT_SECURITY_MEDIUM:
+			return HCI_AT_DEDICATED_BONDING;
+		default:
+			return HCI_AT_NO_BONDING;
+		}
+	} else if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) {
+		if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW)
+			l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
+
+		if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH)
+			return HCI_AT_NO_BONDING_MITM;
+		else
+			return HCI_AT_NO_BONDING;
+	} else {
+		switch (l2cap_pi(sk)->sec_level) {
+		case BT_SECURITY_HIGH:
+			return HCI_AT_GENERAL_BONDING_MITM;
+		case BT_SECURITY_MEDIUM:
+			return HCI_AT_GENERAL_BONDING;
+		default:
+			return HCI_AT_NO_BONDING;
+		}
+	}
+}
+
+/* Service level security */
+static inline int l2cap_check_security(struct sock *sk)
+{
+	struct l2cap_conn *conn = l2cap_pi(sk)->conn;
+	__u8 auth_type;
+
+	auth_type = l2cap_get_auth_type(sk);
+
+	return hci_conn_security(conn->hcon, l2cap_pi(sk)->sec_level,
+								auth_type);
+}
+
+static inline u8 l2cap_get_ident(struct l2cap_conn *conn)
+{
+	u8 id;
+
+	/* Get next available identificator.
+	 *    1 - 128 are used by kernel.
+	 *  129 - 199 are reserved.
+	 *  200 - 254 are used by utilities like l2ping, etc.
+	 */
+
+	spin_lock_bh(&conn->lock);
+
+	if (++conn->tx_ident > 128)
+		conn->tx_ident = 1;
+
+	id = conn->tx_ident;
+
+	spin_unlock_bh(&conn->lock);
+
+	return id;
+}
+
+static inline void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data)
+{
+	struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
+	u8 flags;
+
+	BT_DBG("code 0x%2.2x", code);
+
+	if (!skb)
+		return;
+
+	if (lmp_no_flush_capable(conn->hcon->hdev))
+		flags = ACL_START_NO_FLUSH;
+	else
+		flags = ACL_START;
+
+	hci_send_acl(conn->hcon, skb, flags);
+}
+
+static inline void l2cap_send_sframe(struct l2cap_pinfo *pi, u16 control)
+{
+	struct sk_buff *skb;
+	struct l2cap_hdr *lh;
+	struct l2cap_conn *conn = pi->conn;
+	struct sock *sk = (struct sock *)pi;
+	int count, hlen = L2CAP_HDR_SIZE + 2;
+	u8 flags;
+
+	if (sk->sk_state != BT_CONNECTED)
+		return;
+
+	if (pi->fcs == L2CAP_FCS_CRC16)
+		hlen += 2;
+
+	BT_DBG("pi %p, control 0x%2.2x", pi, control);
+
+	count = min_t(unsigned int, conn->mtu, hlen);
+	control |= L2CAP_CTRL_FRAME_TYPE;
+
+	if (pi->conn_state & L2CAP_CONN_SEND_FBIT) {
+		control |= L2CAP_CTRL_FINAL;
+		pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
+	}
+
+	if (pi->conn_state & L2CAP_CONN_SEND_PBIT) {
+		control |= L2CAP_CTRL_POLL;
+		pi->conn_state &= ~L2CAP_CONN_SEND_PBIT;
+	}
+
+	skb = bt_skb_alloc(count, GFP_ATOMIC);
+	if (!skb)
+		return;
+
+	lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
+	lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
+	lh->cid = cpu_to_le16(pi->dcid);
+	put_unaligned_le16(control, skb_put(skb, 2));
+
+	if (pi->fcs == L2CAP_FCS_CRC16) {
+		u16 fcs = crc16(0, (u8 *)lh, count - 2);
+		put_unaligned_le16(fcs, skb_put(skb, 2));
+	}
+
+	if (lmp_no_flush_capable(conn->hcon->hdev))
+		flags = ACL_START_NO_FLUSH;
+	else
+		flags = ACL_START;
+
+	hci_send_acl(pi->conn->hcon, skb, flags);
+}
+
+static inline void l2cap_send_rr_or_rnr(struct l2cap_pinfo *pi, u16 control)
+{
+	if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
+		control |= L2CAP_SUPER_RCV_NOT_READY;
+		pi->conn_state |= L2CAP_CONN_RNR_SENT;
+	} else
+		control |= L2CAP_SUPER_RCV_READY;
+
+	control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
+
+	l2cap_send_sframe(pi, control);
+}
+
+static inline int __l2cap_no_conn_pending(struct sock *sk)
+{
+	return !(l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND);
+}
+
+static void l2cap_do_start(struct sock *sk)
+{
+	struct l2cap_conn *conn = l2cap_pi(sk)->conn;
+
+	if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) {
+		if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
+			return;
+
+		if (l2cap_check_security(sk) && __l2cap_no_conn_pending(sk)) {
+			struct l2cap_conn_req req;
+			req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
+			req.psm  = l2cap_pi(sk)->psm;
+
+			l2cap_pi(sk)->ident = l2cap_get_ident(conn);
+			l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
+
+			l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
+					L2CAP_CONN_REQ, sizeof(req), &req);
+		}
+	} else {
+		struct l2cap_info_req req;
+		req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
+
+		conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
+		conn->info_ident = l2cap_get_ident(conn);
+
+		mod_timer(&conn->info_timer, jiffies +
+					msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
+
+		l2cap_send_cmd(conn, conn->info_ident,
+					L2CAP_INFO_REQ, sizeof(req), &req);
+	}
+}
+
+static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
+{
+	u32 local_feat_mask = l2cap_feat_mask;
+	if (!disable_ertm)
+		local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
+
+	switch (mode) {
+	case L2CAP_MODE_ERTM:
+		return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
+	case L2CAP_MODE_STREAMING:
+		return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
+	default:
+		return 0x00;
+	}
+}
+
+static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct sock *sk, int err)
+{
+	struct l2cap_disconn_req req;
+
+	if (!conn)
+		return;
+
+	skb_queue_purge(TX_QUEUE(sk));
+
+	if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) {
+		del_timer(&l2cap_pi(sk)->retrans_timer);
+		del_timer(&l2cap_pi(sk)->monitor_timer);
+		del_timer(&l2cap_pi(sk)->ack_timer);
+	}
+
+	req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid);
+	req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
+	l2cap_send_cmd(conn, l2cap_get_ident(conn),
+			L2CAP_DISCONN_REQ, sizeof(req), &req);
+
+	sk->sk_state = BT_DISCONN;
+	sk->sk_err = err;
+}
+
+/* ---- L2CAP connections ---- */
+static void l2cap_conn_start(struct l2cap_conn *conn)
+{
+	struct l2cap_chan_list *l = &conn->chan_list;
+	struct sock_del_list del, *tmp1, *tmp2;
+	struct sock *sk;
+
+	BT_DBG("conn %p", conn);
+
+	INIT_LIST_HEAD(&del.list);
+
+	read_lock(&l->lock);
+
+	for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
+		bh_lock_sock(sk);
+
+		if (sk->sk_type != SOCK_SEQPACKET &&
+				sk->sk_type != SOCK_STREAM) {
+			bh_unlock_sock(sk);
+			continue;
+		}
+
+		if (sk->sk_state == BT_CONNECT) {
+			struct l2cap_conn_req req;
+
+			if (!l2cap_check_security(sk) ||
+					!__l2cap_no_conn_pending(sk)) {
+				bh_unlock_sock(sk);
+				continue;
+			}
+
+			if (!l2cap_mode_supported(l2cap_pi(sk)->mode,
+					conn->feat_mask)
+					&& l2cap_pi(sk)->conf_state &
+					L2CAP_CONF_STATE2_DEVICE) {
+				tmp1 = kzalloc(sizeof(struct sock_del_list),
+						GFP_ATOMIC);
+				tmp1->sk = sk;
+				list_add_tail(&tmp1->list, &del.list);
+				bh_unlock_sock(sk);
+				continue;
+			}
+
+			req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
+			req.psm  = l2cap_pi(sk)->psm;
+
+			l2cap_pi(sk)->ident = l2cap_get_ident(conn);
+			l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
+
+			l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
+				L2CAP_CONN_REQ, sizeof(req), &req);
+
+		} else if (sk->sk_state == BT_CONNECT2) {
+			struct l2cap_conn_rsp rsp;
+			char buf[128];
+			rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
+			rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
+
+			if (l2cap_check_security(sk)) {
+				if (bt_sk(sk)->defer_setup) {
+					struct sock *parent = bt_sk(sk)->parent;
+					rsp.result = cpu_to_le16(L2CAP_CR_PEND);
+					rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
+					parent->sk_data_ready(parent, 0);
+
+				} else {
+					sk->sk_state = BT_CONFIG;
+					rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
+					rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
+				}
+			} else {
+				rsp.result = cpu_to_le16(L2CAP_CR_PEND);
+				rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
+			}
+
+			l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
+					L2CAP_CONN_RSP, sizeof(rsp), &rsp);
+
+			if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT ||
+					rsp.result != L2CAP_CR_SUCCESS) {
+				bh_unlock_sock(sk);
+				continue;
+			}
+
+			l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
+			l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
+						l2cap_build_conf_req(sk, buf), buf);
+			l2cap_pi(sk)->num_conf_req++;
+		}
+
+		bh_unlock_sock(sk);
+	}
+
+	read_unlock(&l->lock);
+
+	list_for_each_entry_safe(tmp1, tmp2, &del.list, list) {
+		bh_lock_sock(tmp1->sk);
+		__l2cap_sock_close(tmp1->sk, ECONNRESET);
+		bh_unlock_sock(tmp1->sk);
+		list_del(&tmp1->list);
+		kfree(tmp1);
+	}
+}
+
+static void l2cap_conn_ready(struct l2cap_conn *conn)
+{
+	struct l2cap_chan_list *l = &conn->chan_list;
+	struct sock *sk;
+
+	BT_DBG("conn %p", conn);
+
+	read_lock(&l->lock);
+
+	for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
+		bh_lock_sock(sk);
+
+		if (sk->sk_type != SOCK_SEQPACKET &&
+				sk->sk_type != SOCK_STREAM) {
+			l2cap_sock_clear_timer(sk);
+			sk->sk_state = BT_CONNECTED;
+			sk->sk_state_change(sk);
+		} else if (sk->sk_state == BT_CONNECT)
+			l2cap_do_start(sk);
+
+		bh_unlock_sock(sk);
+	}
+
+	read_unlock(&l->lock);
+}
+
+/* Notify sockets that we cannot guaranty reliability anymore */
+static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
+{
+	struct l2cap_chan_list *l = &conn->chan_list;
+	struct sock *sk;
+
+	BT_DBG("conn %p", conn);
+
+	read_lock(&l->lock);
+
+	for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
+		if (l2cap_pi(sk)->force_reliable)
+			sk->sk_err = err;
+	}
+
+	read_unlock(&l->lock);
+}
+
+static void l2cap_info_timeout(unsigned long arg)
+{
+	struct l2cap_conn *conn = (void *) arg;
+
+	conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
+	conn->info_ident = 0;
+
+	l2cap_conn_start(conn);
+}
+
+static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status)
+{
+	struct l2cap_conn *conn = hcon->l2cap_data;
+
+	if (conn || status)
+		return conn;
+
+	conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC);
+	if (!conn)
+		return NULL;
+
+	hcon->l2cap_data = conn;
+	conn->hcon = hcon;
+
+	BT_DBG("hcon %p conn %p", hcon, conn);
+
+	conn->mtu = hcon->hdev->acl_mtu;
+	conn->src = &hcon->hdev->bdaddr;
+	conn->dst = &hcon->dst;
+
+	conn->feat_mask = 0;
+
+	spin_lock_init(&conn->lock);
+	rwlock_init(&conn->chan_list.lock);
+
+	setup_timer(&conn->info_timer, l2cap_info_timeout,
+						(unsigned long) conn);
+
+	conn->disc_reason = 0x13;
+
+	return conn;
+}
+
+static void l2cap_conn_del(struct hci_conn *hcon, int err)
+{
+	struct l2cap_conn *conn = hcon->l2cap_data;
+	struct sock *sk;
+
+	if (!conn)
+		return;
+
+	BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
+
+	kfree_skb(conn->rx_skb);
+
+	/* Kill channels */
+	while ((sk = conn->chan_list.head)) {
+		bh_lock_sock(sk);
+		l2cap_chan_del(sk, err);
+		bh_unlock_sock(sk);
+		l2cap_sock_kill(sk);
+	}
+
+	if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
+		del_timer_sync(&conn->info_timer);
+
+	hcon->l2cap_data = NULL;
+	kfree(conn);
+}
+
+static inline void l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent)
+{
+	struct l2cap_chan_list *l = &conn->chan_list;
+	write_lock_bh(&l->lock);
+	__l2cap_chan_add(conn, sk, parent);
+	write_unlock_bh(&l->lock);
+}
+
+/* ---- Socket interface ---- */
+static struct sock *__l2cap_get_sock_by_addr(__le16 psm, bdaddr_t *src)
+{
+	struct sock *sk;
+	struct hlist_node *node;
+	sk_for_each(sk, node, &l2cap_sk_list.head)
+		if (l2cap_pi(sk)->sport == psm && !bacmp(&bt_sk(sk)->src, src))
+			goto found;
+	sk = NULL;
+found:
+	return sk;
+}
+
+/* Find socket with psm and source bdaddr.
+ * Returns closest match.
+ */
+static struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src)
+{
+	struct sock *sk = NULL, *sk1 = NULL;
+	struct hlist_node *node;
+
+	read_lock(&l2cap_sk_list.lock);
+
+	sk_for_each(sk, node, &l2cap_sk_list.head) {
+		if (state && sk->sk_state != state)
+			continue;
+
+		if (l2cap_pi(sk)->psm == psm) {
+			/* Exact match. */
+			if (!bacmp(&bt_sk(sk)->src, src))
+				break;
+
+			/* Closest match */
+			if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
+				sk1 = sk;
+		}
+	}
+
+	read_unlock(&l2cap_sk_list.lock);
+
+	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;
+
+	BT_DBG("parent %p", parent);
+
+	/* Close not yet accepted channels */
+	while ((sk = bt_accept_dequeue(parent, NULL)))
+		l2cap_sock_close(sk);
+
+	parent->sk_state = BT_CLOSED;
+	sock_set_flag(parent, SOCK_ZAPPED);
+}
+
+/* Kill socket (only if zapped and orphan)
+ * Must be called on unlocked socket.
+ */
+static void l2cap_sock_kill(struct sock *sk)
+{
+	if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
+		return;
+
+	BT_DBG("sk %p state %d", sk, sk->sk_state);
+
+	/* Kill poor orphan */
+	bt_sock_unlink(&l2cap_sk_list, sk);
+	sock_set_flag(sk, SOCK_DEAD);
+	sock_put(sk);
+}
+
+static void __l2cap_sock_close(struct sock *sk, int reason)
+{
+	BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
+
+	switch (sk->sk_state) {
+	case BT_LISTEN:
+		l2cap_sock_cleanup_listen(sk);
+		break;
+
+	case BT_CONNECTED:
+	case BT_CONFIG:
+		if (sk->sk_type == SOCK_SEQPACKET ||
+				sk->sk_type == SOCK_STREAM) {
+			struct l2cap_conn *conn = l2cap_pi(sk)->conn;
+
+			l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
+			l2cap_send_disconn_req(conn, sk, reason);
+		} else
+			l2cap_chan_del(sk, reason);
+		break;
+
+	case BT_CONNECT2:
+		if (sk->sk_type == SOCK_SEQPACKET ||
+				sk->sk_type == SOCK_STREAM) {
+			struct l2cap_conn *conn = l2cap_pi(sk)->conn;
+			struct l2cap_conn_rsp rsp;
+			__u16 result;
+
+			if (bt_sk(sk)->defer_setup)
+				result = L2CAP_CR_SEC_BLOCK;
+			else
+				result = L2CAP_CR_BAD_PSM;
+			sk->sk_state = BT_DISCONN;
+
+			rsp.scid   = cpu_to_le16(l2cap_pi(sk)->dcid);
+			rsp.dcid   = cpu_to_le16(l2cap_pi(sk)->scid);
+			rsp.result = cpu_to_le16(result);
+			rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
+			l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
+					L2CAP_CONN_RSP, sizeof(rsp), &rsp);
+		} else
+			l2cap_chan_del(sk, reason);
+		break;
+
+	case BT_CONNECT:
+	case BT_DISCONN:
+		l2cap_chan_del(sk, reason);
+		break;
+
+	default:
+		sock_set_flag(sk, SOCK_ZAPPED);
+		break;
+	}
+}
+
+/* Must be called on unlocked socket. */
+static void l2cap_sock_close(struct sock *sk)
+{
+	l2cap_sock_clear_timer(sk);
+	lock_sock(sk);
+	__l2cap_sock_close(sk, ECONNRESET);
+	release_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;
+	struct sockaddr_l2 la;
+	int len, err = 0;
+
+	BT_DBG("sk %p", sk);
+
+	if (!addr || addr->sa_family != AF_BLUETOOTH)
+		return -EINVAL;
+
+	memset(&la, 0, sizeof(la));
+	len = min_t(unsigned int, sizeof(la), alen);
+	memcpy(&la, addr, len);
+
+	if (la.l2_cid)
+		return -EINVAL;
+
+	lock_sock(sk);
+
+	if (sk->sk_state != BT_OPEN) {
+		err = -EBADFD;
+		goto done;
+	}
+
+	if (la.l2_psm) {
+		__u16 psm = __le16_to_cpu(la.l2_psm);
+
+		/* PSM must be odd and lsb of upper byte must be 0 */
+		if ((psm & 0x0101) != 0x0001) {
+			err = -EINVAL;
+			goto done;
+		}
+
+		/* Restrict usage of well-known PSMs */
+		if (psm < 0x1001 && !capable(CAP_NET_BIND_SERVICE)) {
+			err = -EACCES;
+			goto done;
+		}
+	}
+
+	write_lock_bh(&l2cap_sk_list.lock);
+
+	if (la.l2_psm && __l2cap_get_sock_by_addr(la.l2_psm, &la.l2_bdaddr)) {
+		err = -EADDRINUSE;
+	} else {
+		/* Save source address */
+		bacpy(&bt_sk(sk)->src, &la.l2_bdaddr);
+		l2cap_pi(sk)->psm   = la.l2_psm;
+		l2cap_pi(sk)->sport = la.l2_psm;
+		sk->sk_state = BT_BOUND;
+
+		if (__le16_to_cpu(la.l2_psm) == 0x0001 ||
+					__le16_to_cpu(la.l2_psm) == 0x0003)
+			l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
+	}
+
+	write_unlock_bh(&l2cap_sk_list.lock);
+
+done:
+	release_sock(sk);
+	return err;
+}
+
+static int l2cap_do_connect(struct sock *sk)
+{
+	bdaddr_t *src = &bt_sk(sk)->src;
+	bdaddr_t *dst = &bt_sk(sk)->dst;
+	struct l2cap_conn *conn;
+	struct hci_conn *hcon;
+	struct hci_dev *hdev;
+	__u8 auth_type;
+	int err;
+
+	BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst),
+							l2cap_pi(sk)->psm);
+
+	hdev = hci_get_route(dst, src);
+	if (!hdev)
+		return -EHOSTUNREACH;
+
+	hci_dev_lock_bh(hdev);
+
+	err = -ENOMEM;
+
+	auth_type = l2cap_get_auth_type(sk);
+
+	hcon = hci_connect(hdev, ACL_LINK, dst,
+					l2cap_pi(sk)->sec_level, auth_type);
+	if (!hcon)
+		goto done;
+
+	conn = l2cap_conn_add(hcon, 0);
+	if (!conn) {
+		hci_conn_put(hcon);
+		goto done;
+	}
+
+	err = 0;
+
+	/* Update source addr of the socket */
+	bacpy(src, conn->src);
+
+	l2cap_chan_add(conn, sk, NULL);
+
+	sk->sk_state = BT_CONNECT;
+	l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
+
+	if (hcon->state == BT_CONNECTED) {
+		if (sk->sk_type != SOCK_SEQPACKET &&
+				sk->sk_type != SOCK_STREAM) {
+			l2cap_sock_clear_timer(sk);
+			if (l2cap_check_security(sk))
+				sk->sk_state = BT_CONNECTED;
+		} else
+			l2cap_do_start(sk);
+	}
+
+done:
+	hci_dev_unlock_bh(hdev);
+	hci_dev_put(hdev);
+	return err;
+}
+
+static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
+{
+	struct sock *sk = sock->sk;
+	struct sockaddr_l2 la;
+	int len, err = 0;
+
+	BT_DBG("sk %p", sk);
+
+	if (!addr || alen < sizeof(addr->sa_family) ||
+	    addr->sa_family != AF_BLUETOOTH)
+		return -EINVAL;
+
+	memset(&la, 0, sizeof(la));
+	len = min_t(unsigned int, sizeof(la), alen);
+	memcpy(&la, addr, len);
+
+	if (la.l2_cid)
+		return -EINVAL;
+
+	lock_sock(sk);
+
+	if ((sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM)
+			&& !la.l2_psm) {
+		err = -EINVAL;
+		goto done;
+	}
+
+	switch (l2cap_pi(sk)->mode) {
+	case L2CAP_MODE_BASIC:
+		break;
+	case L2CAP_MODE_ERTM:
+	case L2CAP_MODE_STREAMING:
+		if (!disable_ertm)
+			break;
+		/* fall through */
+	default:
+		err = -ENOTSUPP;
+		goto done;
+	}
+
+	switch (sk->sk_state) {
+	case BT_CONNECT:
+	case BT_CONNECT2:
+	case BT_CONFIG:
+		/* Already connecting */
+		goto wait;
+
+	case BT_CONNECTED:
+		/* Already connected */
+		err = -EISCONN;
+		goto done;
+
+	case BT_OPEN:
+	case BT_BOUND:
+		/* Can connect */
+		break;
+
+	default:
+		err = -EBADFD;
+		goto done;
+	}
+
+	/* PSM must be odd and lsb of upper byte must be 0 */
+	if ((__le16_to_cpu(la.l2_psm) & 0x0101) != 0x0001 &&
+		sk->sk_type != SOCK_RAW) {
+		err = -EINVAL;
+		goto done;
+	}
+
+	/* Set destination address and psm */
+	bacpy(&bt_sk(sk)->dst, &la.l2_bdaddr);
+	l2cap_pi(sk)->psm = la.l2_psm;
+
+	err = l2cap_do_connect(sk);
+	if (err)
+		goto done;
+
+wait:
+	err = bt_sock_wait_state(sk, BT_CONNECTED,
+			sock_sndtimeo(sk, flags & O_NONBLOCK));
+done:
+	release_sock(sk);
+	return err;
+}
+
+static int l2cap_sock_listen(struct socket *sock, int backlog)
+{
+	struct sock *sk = sock->sk;
+	int err = 0;
+
+	BT_DBG("sk %p backlog %d", sk, backlog);
+
+	lock_sock(sk);
+
+	if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM)
+			|| sk->sk_state != BT_BOUND) {
+		err = -EBADFD;
+		goto done;
+	}
+
+	switch (l2cap_pi(sk)->mode) {
+	case L2CAP_MODE_BASIC:
+		break;
+	case L2CAP_MODE_ERTM:
+	case L2CAP_MODE_STREAMING:
+		if (!disable_ertm)
+			break;
+		/* fall through */
+	default:
+		err = -ENOTSUPP;
+		goto done;
+	}
+
+	if (!l2cap_pi(sk)->psm) {
+		bdaddr_t *src = &bt_sk(sk)->src;
+		u16 psm;
+
+		err = -EINVAL;
+
+		write_lock_bh(&l2cap_sk_list.lock);
+
+		for (psm = 0x1001; psm < 0x1100; psm += 2)
+			if (!__l2cap_get_sock_by_addr(cpu_to_le16(psm), src)) {
+				l2cap_pi(sk)->psm   = cpu_to_le16(psm);
+				l2cap_pi(sk)->sport = cpu_to_le16(psm);
+				err = 0;
+				break;
+			}
+
+		write_unlock_bh(&l2cap_sk_list.lock);
+
+		if (err < 0)
+			goto done;
+	}
+
+	sk->sk_max_ack_backlog = backlog;
+	sk->sk_ack_backlog = 0;
+	sk->sk_state = BT_LISTEN;
+
+done:
+	release_sock(sk);
+	return err;
+}
+
+static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags)
+{
+	DECLARE_WAITQUEUE(wait, current);
+	struct sock *sk = sock->sk, *nsk;
+	long timeo;
+	int err = 0;
+
+	lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
+
+	if (sk->sk_state != BT_LISTEN) {
+		err = -EBADFD;
+		goto done;
+	}
+
+	timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
+
+	BT_DBG("sk %p timeo %ld", sk, timeo);
+
+	/* Wait for an incoming connection. (wake-one). */
+	add_wait_queue_exclusive(sk_sleep(sk), &wait);
+	while (!(nsk = bt_accept_dequeue(sk, newsock))) {
+		set_current_state(TASK_INTERRUPTIBLE);
+		if (!timeo) {
+			err = -EAGAIN;
+			break;
+		}
+
+		release_sock(sk);
+		timeo = schedule_timeout(timeo);
+		lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
+
+		if (sk->sk_state != BT_LISTEN) {
+			err = -EBADFD;
+			break;
+		}
+
+		if (signal_pending(current)) {
+			err = sock_intr_errno(timeo);
+			break;
+		}
+	}
+	set_current_state(TASK_RUNNING);
+	remove_wait_queue(sk_sleep(sk), &wait);
+
+	if (err)
+		goto done;
+
+	newsock->state = SS_CONNECTED;
+
+	BT_DBG("new socket %p", nsk);
+
+done:
+	release_sock(sk);
+	return err;
+}
+
+static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
+{
+	struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
+	struct sock *sk = sock->sk;
+
+	BT_DBG("sock %p, sk %p", sock, sk);
+
+	addr->sa_family = AF_BLUETOOTH;
+	*len = sizeof(struct sockaddr_l2);
+
+	if (peer) {
+		la->l2_psm = l2cap_pi(sk)->psm;
+		bacpy(&la->l2_bdaddr, &bt_sk(sk)->dst);
+		la->l2_cid = cpu_to_le16(l2cap_pi(sk)->dcid);
+	} else {
+		la->l2_psm = l2cap_pi(sk)->sport;
+		bacpy(&la->l2_bdaddr, &bt_sk(sk)->src);
+		la->l2_cid = cpu_to_le16(l2cap_pi(sk)->scid);
+	}
+
+	return 0;
+}
+
+static int __l2cap_wait_ack(struct sock *sk)
+{
+	DECLARE_WAITQUEUE(wait, current);
+	int err = 0;
+	int timeo = HZ/5;
+
+	add_wait_queue(sk_sleep(sk), &wait);
+	while ((l2cap_pi(sk)->unacked_frames > 0 && l2cap_pi(sk)->conn)) {
+		set_current_state(TASK_INTERRUPTIBLE);
+
+		if (!timeo)
+			timeo = HZ/5;
+
+		if (signal_pending(current)) {
+			err = sock_intr_errno(timeo);
+			break;
+		}
+
+		release_sock(sk);
+		timeo = schedule_timeout(timeo);
+		lock_sock(sk);
+
+		err = sock_error(sk);
+		if (err)
+			break;
+	}
+	set_current_state(TASK_RUNNING);
+	remove_wait_queue(sk_sleep(sk), &wait);
+	return err;
+}
+
+static void l2cap_monitor_timeout(unsigned long arg)
+{
+	struct sock *sk = (void *) arg;
+
+	BT_DBG("sk %p", sk);
+
+	bh_lock_sock(sk);
+	if (l2cap_pi(sk)->retry_count >= l2cap_pi(sk)->remote_max_tx) {
+		l2cap_send_disconn_req(l2cap_pi(sk)->conn, sk, ECONNABORTED);
+		bh_unlock_sock(sk);
+		return;
+	}
+
+	l2cap_pi(sk)->retry_count++;
+	__mod_monitor_timer();
+
+	l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL);
+	bh_unlock_sock(sk);
+}
+
+static void l2cap_retrans_timeout(unsigned long arg)
+{
+	struct sock *sk = (void *) arg;
+
+	BT_DBG("sk %p", sk);
+
+	bh_lock_sock(sk);
+	l2cap_pi(sk)->retry_count = 1;
+	__mod_monitor_timer();
+
+	l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F;
+
+	l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL);
+	bh_unlock_sock(sk);
+}
+
+static void l2cap_drop_acked_frames(struct sock *sk)
+{
+	struct sk_buff *skb;
+
+	while ((skb = skb_peek(TX_QUEUE(sk))) &&
+			l2cap_pi(sk)->unacked_frames) {
+		if (bt_cb(skb)->tx_seq == l2cap_pi(sk)->expected_ack_seq)
+			break;
+
+		skb = skb_dequeue(TX_QUEUE(sk));
+		kfree_skb(skb);
+
+		l2cap_pi(sk)->unacked_frames--;
+	}
+
+	if (!l2cap_pi(sk)->unacked_frames)
+		del_timer(&l2cap_pi(sk)->retrans_timer);
+}
+
+static inline void l2cap_do_send(struct sock *sk, struct sk_buff *skb)
+{
+	struct l2cap_pinfo *pi = l2cap_pi(sk);
+	struct hci_conn *hcon = pi->conn->hcon;
+	u16 flags;
+
+	BT_DBG("sk %p, skb %p len %d", sk, skb, skb->len);
+
+	if (!pi->flushable && lmp_no_flush_capable(hcon->hdev))
+		flags = ACL_START_NO_FLUSH;
+	else
+		flags = ACL_START;
+
+	hci_send_acl(hcon, skb, flags);
+}
+
+static void l2cap_streaming_send(struct sock *sk)
+{
+	struct sk_buff *skb;
+	struct l2cap_pinfo *pi = l2cap_pi(sk);
+	u16 control, fcs;
+
+	while ((skb = skb_dequeue(TX_QUEUE(sk)))) {
+		control = get_unaligned_le16(skb->data + L2CAP_HDR_SIZE);
+		control |= pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT;
+		put_unaligned_le16(control, skb->data + L2CAP_HDR_SIZE);
+
+		if (pi->fcs == L2CAP_FCS_CRC16) {
+			fcs = crc16(0, (u8 *)skb->data, skb->len - 2);
+			put_unaligned_le16(fcs, skb->data + skb->len - 2);
+		}
+
+		l2cap_do_send(sk, skb);
+
+		pi->next_tx_seq = (pi->next_tx_seq + 1) % 64;
+	}
+}
+
+static void l2cap_retransmit_one_frame(struct sock *sk, u8 tx_seq)
+{
+	struct l2cap_pinfo *pi = l2cap_pi(sk);
+	struct sk_buff *skb, *tx_skb;
+	u16 control, fcs;
+
+	skb = skb_peek(TX_QUEUE(sk));
+	if (!skb)
+		return;
+
+	do {
+		if (bt_cb(skb)->tx_seq == tx_seq)
+			break;
+
+		if (skb_queue_is_last(TX_QUEUE(sk), skb))
+			return;
+
+	} while ((skb = skb_queue_next(TX_QUEUE(sk), skb)));
+
+	if (pi->remote_max_tx &&
+			bt_cb(skb)->retries == pi->remote_max_tx) {
+		l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED);
+		return;
+	}
+
+	tx_skb = skb_clone(skb, GFP_ATOMIC);
+	bt_cb(skb)->retries++;
+	control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
+
+	if (pi->conn_state & L2CAP_CONN_SEND_FBIT) {
+		control |= L2CAP_CTRL_FINAL;
+		pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
+	}
+
+	control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT)
+			| (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT);
+
+	put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
+
+	if (pi->fcs == L2CAP_FCS_CRC16) {
+		fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2);
+		put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2);
+	}
+
+	l2cap_do_send(sk, tx_skb);
+}
+
+static int l2cap_ertm_send(struct sock *sk)
+{
+	struct sk_buff *skb, *tx_skb;
+	struct l2cap_pinfo *pi = l2cap_pi(sk);
+	u16 control, fcs;
+	int nsent = 0;
+
+	if (sk->sk_state != BT_CONNECTED)
+		return -ENOTCONN;
+
+	while ((skb = sk->sk_send_head) && (!l2cap_tx_window_full(sk))) {
+
+		if (pi->remote_max_tx &&
+				bt_cb(skb)->retries == pi->remote_max_tx) {
+			l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED);
+			break;
+		}
+
+		tx_skb = skb_clone(skb, GFP_ATOMIC);
+
+		bt_cb(skb)->retries++;
+
+		control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
+		control &= L2CAP_CTRL_SAR;
+
+		if (pi->conn_state & L2CAP_CONN_SEND_FBIT) {
+			control |= L2CAP_CTRL_FINAL;
+			pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
+		}
+		control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT)
+				| (pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT);
+		put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
+
+
+		if (pi->fcs == L2CAP_FCS_CRC16) {
+			fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2);
+			put_unaligned_le16(fcs, skb->data + tx_skb->len - 2);
+		}
+
+		l2cap_do_send(sk, tx_skb);
+
+		__mod_retrans_timer();
+
+		bt_cb(skb)->tx_seq = pi->next_tx_seq;
+		pi->next_tx_seq = (pi->next_tx_seq + 1) % 64;
+
+		pi->unacked_frames++;
+		pi->frames_sent++;
+
+		if (skb_queue_is_last(TX_QUEUE(sk), skb))
+			sk->sk_send_head = NULL;
+		else
+			sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb);
+
+		nsent++;
+	}
+
+	return nsent;
+}
+
+static int l2cap_retransmit_frames(struct sock *sk)
+{
+	struct l2cap_pinfo *pi = l2cap_pi(sk);
+	int ret;
+
+	if (!skb_queue_empty(TX_QUEUE(sk)))
+		sk->sk_send_head = TX_QUEUE(sk)->next;
+
+	pi->next_tx_seq = pi->expected_ack_seq;
+	ret = l2cap_ertm_send(sk);
+	return ret;
+}
+
+static void l2cap_send_ack(struct l2cap_pinfo *pi)
+{
+	struct sock *sk = (struct sock *)pi;
+	u16 control = 0;
+
+	control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
+
+	if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
+		control |= L2CAP_SUPER_RCV_NOT_READY;
+		pi->conn_state |= L2CAP_CONN_RNR_SENT;
+		l2cap_send_sframe(pi, control);
+		return;
+	}
+
+	if (l2cap_ertm_send(sk) > 0)
+		return;
+
+	control |= L2CAP_SUPER_RCV_READY;
+	l2cap_send_sframe(pi, control);
+}
+
+static void l2cap_send_srejtail(struct sock *sk)
+{
+	struct srej_list *tail;
+	u16 control;
+
+	control = L2CAP_SUPER_SELECT_REJECT;
+	control |= L2CAP_CTRL_FINAL;
+
+	tail = list_entry(SREJ_LIST(sk)->prev, struct srej_list, list);
+	control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
+
+	l2cap_send_sframe(l2cap_pi(sk), control);
+}
+
+static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb)
+{
+	struct l2cap_conn *conn = l2cap_pi(sk)->conn;
+	struct sk_buff **frag;
+	int err, sent = 0;
+
+	if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count))
+		return -EFAULT;
+
+	sent += count;
+	len  -= count;
+
+	/* Continuation fragments (no L2CAP header) */
+	frag = &skb_shinfo(skb)->frag_list;
+	while (len) {
+		count = min_t(unsigned int, conn->mtu, len);
+
+		*frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err);
+		if (!*frag)
+			return err;
+		if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
+			return -EFAULT;
+
+		sent += count;
+		len  -= count;
+
+		frag = &(*frag)->next;
+	}
+
+	return sent;
+}
+
+static struct sk_buff *l2cap_create_connless_pdu(struct sock *sk, struct msghdr *msg, size_t len)
+{
+	struct l2cap_conn *conn = l2cap_pi(sk)->conn;
+	struct sk_buff *skb;
+	int err, count, hlen = L2CAP_HDR_SIZE + 2;
+	struct l2cap_hdr *lh;
+
+	BT_DBG("sk %p len %d", sk, (int)len);
+
+	count = min_t(unsigned int, (conn->mtu - hlen), len);
+	skb = bt_skb_send_alloc(sk, count + hlen,
+			msg->msg_flags & MSG_DONTWAIT, &err);
+	if (!skb)
+		return ERR_PTR(err);
+
+	/* Create L2CAP header */
+	lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
+	lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid);
+	lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
+	put_unaligned_le16(l2cap_pi(sk)->psm, skb_put(skb, 2));
+
+	err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
+	if (unlikely(err < 0)) {
+		kfree_skb(skb);
+		return ERR_PTR(err);
+	}
+	return skb;
+}
+
+static struct sk_buff *l2cap_create_basic_pdu(struct sock *sk, struct msghdr *msg, size_t len)
+{
+	struct l2cap_conn *conn = l2cap_pi(sk)->conn;
+	struct sk_buff *skb;
+	int err, count, hlen = L2CAP_HDR_SIZE;
+	struct l2cap_hdr *lh;
+
+	BT_DBG("sk %p len %d", sk, (int)len);
+
+	count = min_t(unsigned int, (conn->mtu - hlen), len);
+	skb = bt_skb_send_alloc(sk, count + hlen,
+			msg->msg_flags & MSG_DONTWAIT, &err);
+	if (!skb)
+		return ERR_PTR(err);
+
+	/* Create L2CAP header */
+	lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
+	lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid);
+	lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
+
+	err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
+	if (unlikely(err < 0)) {
+		kfree_skb(skb);
+		return ERR_PTR(err);
+	}
+	return skb;
+}
+
+static struct sk_buff *l2cap_create_iframe_pdu(struct sock *sk, struct msghdr *msg, size_t len, u16 control, u16 sdulen)
+{
+	struct l2cap_conn *conn = l2cap_pi(sk)->conn;
+	struct sk_buff *skb;
+	int err, count, hlen = L2CAP_HDR_SIZE + 2;
+	struct l2cap_hdr *lh;
+
+	BT_DBG("sk %p len %d", sk, (int)len);
+
+	if (!conn)
+		return ERR_PTR(-ENOTCONN);
+
+	if (sdulen)
+		hlen += 2;
+
+	if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16)
+		hlen += 2;
+
+	count = min_t(unsigned int, (conn->mtu - hlen), len);
+	skb = bt_skb_send_alloc(sk, count + hlen,
+			msg->msg_flags & MSG_DONTWAIT, &err);
+	if (!skb)
+		return ERR_PTR(err);
+
+	/* Create L2CAP header */
+	lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
+	lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid);
+	lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
+	put_unaligned_le16(control, skb_put(skb, 2));
+	if (sdulen)
+		put_unaligned_le16(sdulen, skb_put(skb, 2));
+
+	err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
+	if (unlikely(err < 0)) {
+		kfree_skb(skb);
+		return ERR_PTR(err);
+	}
+
+	if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16)
+		put_unaligned_le16(0, skb_put(skb, 2));
+
+	bt_cb(skb)->retries = 0;
+	return skb;
+}
+
+static inline int l2cap_sar_segment_sdu(struct sock *sk, struct msghdr *msg, size_t len)
+{
+	struct l2cap_pinfo *pi = l2cap_pi(sk);
+	struct sk_buff *skb;
+	struct sk_buff_head sar_queue;
+	u16 control;
+	size_t size = 0;
+
+	skb_queue_head_init(&sar_queue);
+	control = L2CAP_SDU_START;
+	skb = l2cap_create_iframe_pdu(sk, msg, pi->remote_mps, control, len);
+	if (IS_ERR(skb))
+		return PTR_ERR(skb);
+
+	__skb_queue_tail(&sar_queue, skb);
+	len -= pi->remote_mps;
+	size += pi->remote_mps;
+
+	while (len > 0) {
+		size_t buflen;
+
+		if (len > pi->remote_mps) {
+			control = L2CAP_SDU_CONTINUE;
+			buflen = pi->remote_mps;
+		} else {
+			control = L2CAP_SDU_END;
+			buflen = len;
+		}
+
+		skb = l2cap_create_iframe_pdu(sk, msg, buflen, control, 0);
+		if (IS_ERR(skb)) {
+			skb_queue_purge(&sar_queue);
+			return PTR_ERR(skb);
+		}
+
+		__skb_queue_tail(&sar_queue, skb);
+		len -= buflen;
+		size += buflen;
+	}
+	skb_queue_splice_tail(&sar_queue, TX_QUEUE(sk));
+	if (sk->sk_send_head == NULL)
+		sk->sk_send_head = sar_queue.next;
+
+	return size;
+}
+
+static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len)
+{
+	struct sock *sk = sock->sk;
+	struct l2cap_pinfo *pi = l2cap_pi(sk);
+	struct sk_buff *skb;
+	u16 control;
+	int err;
+
+	BT_DBG("sock %p, sk %p", sock, sk);
+
+	err = sock_error(sk);
+	if (err)
+		return err;
+
+	if (msg->msg_flags & MSG_OOB)
+		return -EOPNOTSUPP;
+
+	lock_sock(sk);
+
+	if (sk->sk_state != BT_CONNECTED) {
+		err = -ENOTCONN;
+		goto done;
+	}
+
+	/* Connectionless channel */
+	if (sk->sk_type == SOCK_DGRAM) {
+		skb = l2cap_create_connless_pdu(sk, msg, len);
+		if (IS_ERR(skb)) {
+			err = PTR_ERR(skb);
+		} else {
+			l2cap_do_send(sk, skb);
+			err = len;
+		}
+		goto done;
+	}
+
+	switch (pi->mode) {
+	case L2CAP_MODE_BASIC:
+		/* Check outgoing MTU */
+		if (len > pi->omtu) {
+			err = -EMSGSIZE;
+			goto done;
+		}
+
+		/* Create a basic PDU */
+		skb = l2cap_create_basic_pdu(sk, msg, len);
+		if (IS_ERR(skb)) {
+			err = PTR_ERR(skb);
+			goto done;
+		}
+
+		l2cap_do_send(sk, skb);
+		err = len;
+		break;
+
+	case L2CAP_MODE_ERTM:
+	case L2CAP_MODE_STREAMING:
+		/* Entire SDU fits into one PDU */
+		if (len <= pi->remote_mps) {
+			control = L2CAP_SDU_UNSEGMENTED;
+			skb = l2cap_create_iframe_pdu(sk, msg, len, control, 0);
+			if (IS_ERR(skb)) {
+				err = PTR_ERR(skb);
+				goto done;
+			}
+			__skb_queue_tail(TX_QUEUE(sk), skb);
+
+			if (sk->sk_send_head == NULL)
+				sk->sk_send_head = skb;
+
+		} else {
+		/* Segment SDU into multiples PDUs */
+			err = l2cap_sar_segment_sdu(sk, msg, len);
+			if (err < 0)
+				goto done;
+		}
+
+		if (pi->mode == L2CAP_MODE_STREAMING) {
+			l2cap_streaming_send(sk);
+		} else {
+			if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
+					(pi->conn_state & L2CAP_CONN_WAIT_F)) {
+				err = len;
+				break;
+			}
+			err = l2cap_ertm_send(sk);
+		}
+
+		if (err >= 0)
+			err = len;
+		break;
+
+	default:
+		BT_DBG("bad state %1.1x", pi->mode);
+		err = -EBADFD;
+	}
+
+done:
+	release_sock(sk);
+	return err;
+}
+
+static int l2cap_sock_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags)
+{
+	struct sock *sk = sock->sk;
+
+	lock_sock(sk);
+
+	if (sk->sk_state == BT_CONNECT2 && bt_sk(sk)->defer_setup) {
+		struct l2cap_conn_rsp rsp;
+		struct l2cap_conn *conn = l2cap_pi(sk)->conn;
+		u8 buf[128];
+
+		sk->sk_state = BT_CONFIG;
+
+		rsp.scid   = cpu_to_le16(l2cap_pi(sk)->dcid);
+		rsp.dcid   = cpu_to_le16(l2cap_pi(sk)->scid);
+		rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
+		rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
+		l2cap_send_cmd(l2cap_pi(sk)->conn, l2cap_pi(sk)->ident,
+					L2CAP_CONN_RSP, sizeof(rsp), &rsp);
+
+		if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) {
+			release_sock(sk);
+			return 0;
+		}
+
+		l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
+		l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
+				l2cap_build_conf_req(sk, buf), buf);
+		l2cap_pi(sk)->num_conf_req++;
+
+		release_sock(sk);
+		return 0;
+	}
+
+	release_sock(sk);
+
+	if (sock->type == SOCK_STREAM)
+		return bt_sock_stream_recvmsg(iocb, sock, msg, len, flags);
+
+	return bt_sock_recvmsg(iocb, sock, msg, len, flags);
+}
+
+static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen)
+{
+	struct sock *sk = sock->sk;
+	struct l2cap_options opts;
+	int len, err = 0;
+	u32 opt;
+
+	BT_DBG("sk %p", sk);
+
+	lock_sock(sk);
+
+	switch (optname) {
+	case L2CAP_OPTIONS:
+		if (sk->sk_state == BT_CONNECTED) {
+			err = -EINVAL;
+			break;
+		}
+
+		opts.imtu     = l2cap_pi(sk)->imtu;
+		opts.omtu     = l2cap_pi(sk)->omtu;
+		opts.flush_to = l2cap_pi(sk)->flush_to;
+		opts.mode     = l2cap_pi(sk)->mode;
+		opts.fcs      = l2cap_pi(sk)->fcs;
+		opts.max_tx   = l2cap_pi(sk)->max_tx;
+		opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win;
+
+		len = min_t(unsigned int, sizeof(opts), optlen);
+		if (copy_from_user((char *) &opts, optval, len)) {
+			err = -EFAULT;
+			break;
+		}
+
+		if (opts.txwin_size > L2CAP_DEFAULT_TX_WINDOW) {
+			err = -EINVAL;
+			break;
+		}
+
+		l2cap_pi(sk)->mode = opts.mode;
+		switch (l2cap_pi(sk)->mode) {
+		case L2CAP_MODE_BASIC:
+			l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_STATE2_DEVICE;
+			break;
+		case L2CAP_MODE_ERTM:
+		case L2CAP_MODE_STREAMING:
+			if (!disable_ertm)
+				break;
+			/* fall through */
+		default:
+			err = -EINVAL;
+			break;
+		}
+
+		l2cap_pi(sk)->imtu = opts.imtu;
+		l2cap_pi(sk)->omtu = opts.omtu;
+		l2cap_pi(sk)->fcs  = opts.fcs;
+		l2cap_pi(sk)->max_tx = opts.max_tx;
+		l2cap_pi(sk)->tx_win = (__u8)opts.txwin_size;
+		break;
+
+	case L2CAP_LM:
+		if (get_user(opt, (u32 __user *) optval)) {
+			err = -EFAULT;
+			break;
+		}
+
+		if (opt & L2CAP_LM_AUTH)
+			l2cap_pi(sk)->sec_level = BT_SECURITY_LOW;
+		if (opt & L2CAP_LM_ENCRYPT)
+			l2cap_pi(sk)->sec_level = BT_SECURITY_MEDIUM;
+		if (opt & L2CAP_LM_SECURE)
+			l2cap_pi(sk)->sec_level = BT_SECURITY_HIGH;
+
+		l2cap_pi(sk)->role_switch    = (opt & L2CAP_LM_MASTER);
+		l2cap_pi(sk)->force_reliable = (opt & L2CAP_LM_RELIABLE);
+		break;
+
+	default:
+		err = -ENOPROTOOPT;
+		break;
+	}
+
+	release_sock(sk);
+	return err;
+}
+
+static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
+{
+	struct sock *sk = sock->sk;
+	struct bt_security sec;
+	int len, err = 0;
+	u32 opt;
+
+	BT_DBG("sk %p", sk);
+
+	if (level == SOL_L2CAP)
+		return l2cap_sock_setsockopt_old(sock, optname, optval, optlen);
+
+	if (level != SOL_BLUETOOTH)
+		return -ENOPROTOOPT;
+
+	lock_sock(sk);
+
+	switch (optname) {
+	case BT_SECURITY:
+		if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM
+				&& sk->sk_type != SOCK_RAW) {
+			err = -EINVAL;
+			break;
+		}
+
+		sec.level = BT_SECURITY_LOW;
+
+		len = min_t(unsigned int, sizeof(sec), optlen);
+		if (copy_from_user((char *) &sec, optval, len)) {
+			err = -EFAULT;
+			break;
+		}
+
+		if (sec.level < BT_SECURITY_LOW ||
+					sec.level > BT_SECURITY_HIGH) {
+			err = -EINVAL;
+			break;
+		}
+
+		l2cap_pi(sk)->sec_level = sec.level;
+		break;
+
+	case BT_DEFER_SETUP:
+		if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
+			err = -EINVAL;
+			break;
+		}
+
+		if (get_user(opt, (u32 __user *) optval)) {
+			err = -EFAULT;
+			break;
+		}
+
+		bt_sk(sk)->defer_setup = opt;
+		break;
+
+	case BT_FLUSHABLE:
+		if (get_user(opt, (u32 __user *) optval)) {
+			err = -EFAULT;
+			break;
+		}
+
+		if (opt > BT_FLUSHABLE_ON) {
+			err = -EINVAL;
+			break;
+		}
+
+		if (opt == BT_FLUSHABLE_OFF) {
+			struct l2cap_conn *conn = l2cap_pi(sk)->conn;
+			/* proceed futher only when we have l2cap_conn and
+			   No Flush support in the LM */
+			if (!conn || !lmp_no_flush_capable(conn->hcon->hdev)) {
+				err = -EINVAL;
+				break;
+			}
+		}
+
+		l2cap_pi(sk)->flushable = opt;
+		break;
+
+	default:
+		err = -ENOPROTOOPT;
+		break;
+	}
+
+	release_sock(sk);
+	return err;
+}
+
+static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen)
+{
+	struct sock *sk = sock->sk;
+	struct l2cap_options opts;
+	struct l2cap_conninfo cinfo;
+	int len, err = 0;
+	u32 opt;
+
+	BT_DBG("sk %p", sk);
+
+	if (get_user(len, optlen))
+		return -EFAULT;
+
+	lock_sock(sk);
+
+	switch (optname) {
+	case L2CAP_OPTIONS:
+		opts.imtu     = l2cap_pi(sk)->imtu;
+		opts.omtu     = l2cap_pi(sk)->omtu;
+		opts.flush_to = l2cap_pi(sk)->flush_to;
+		opts.mode     = l2cap_pi(sk)->mode;
+		opts.fcs      = l2cap_pi(sk)->fcs;
+		opts.max_tx   = l2cap_pi(sk)->max_tx;
+		opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win;
+
+		len = min_t(unsigned int, len, sizeof(opts));
+		if (copy_to_user(optval, (char *) &opts, len))
+			err = -EFAULT;
+
+		break;
+
+	case L2CAP_LM:
+		switch (l2cap_pi(sk)->sec_level) {
+		case BT_SECURITY_LOW:
+			opt = L2CAP_LM_AUTH;
+			break;
+		case BT_SECURITY_MEDIUM:
+			opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT;
+			break;
+		case BT_SECURITY_HIGH:
+			opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
+							L2CAP_LM_SECURE;
+			break;
+		default:
+			opt = 0;
+			break;
+		}
+
+		if (l2cap_pi(sk)->role_switch)
+			opt |= L2CAP_LM_MASTER;
+
+		if (l2cap_pi(sk)->force_reliable)
+			opt |= L2CAP_LM_RELIABLE;
+
+		if (put_user(opt, (u32 __user *) optval))
+			err = -EFAULT;
+		break;
+
+	case L2CAP_CONNINFO:
+		if (sk->sk_state != BT_CONNECTED &&
+					!(sk->sk_state == BT_CONNECT2 &&
+						bt_sk(sk)->defer_setup)) {
+			err = -ENOTCONN;
+			break;
+		}
+
+		cinfo.hci_handle = l2cap_pi(sk)->conn->hcon->handle;
+		memcpy(cinfo.dev_class, l2cap_pi(sk)->conn->hcon->dev_class, 3);
+
+		len = min_t(unsigned int, len, sizeof(cinfo));
+		if (copy_to_user(optval, (char *) &cinfo, len))
+			err = -EFAULT;
+
+		break;
+
+	default:
+		err = -ENOPROTOOPT;
+		break;
+	}
+
+	release_sock(sk);
+	return err;
+}
+
+static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
+{
+	struct sock *sk = sock->sk;
+	struct bt_security sec;
+	int len, err = 0;
+
+	BT_DBG("sk %p", sk);
+
+	if (level == SOL_L2CAP)
+		return l2cap_sock_getsockopt_old(sock, optname, optval, optlen);
+
+	if (level != SOL_BLUETOOTH)
+		return -ENOPROTOOPT;
+
+	if (get_user(len, optlen))
+		return -EFAULT;
+
+	lock_sock(sk);
+
+	switch (optname) {
+	case BT_SECURITY:
+		if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM
+				&& sk->sk_type != SOCK_RAW) {
+			err = -EINVAL;
+			break;
+		}
+
+		sec.level = l2cap_pi(sk)->sec_level;
+
+		len = min_t(unsigned int, len, sizeof(sec));
+		if (copy_to_user(optval, (char *) &sec, len))
+			err = -EFAULT;
+
+		break;
+
+	case BT_DEFER_SETUP:
+		if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
+			err = -EINVAL;
+			break;
+		}
+
+		if (put_user(bt_sk(sk)->defer_setup, (u32 __user *) optval))
+			err = -EFAULT;
+
+		break;
+
+	case BT_FLUSHABLE:
+		if (put_user(l2cap_pi(sk)->flushable, (u32 __user *) optval))
+			err = -EFAULT;
+
+		break;
+
+	default:
+		err = -ENOPROTOOPT;
+		break;
+	}
+
+	release_sock(sk);
+	return err;
+}
+
+static int l2cap_sock_shutdown(struct socket *sock, int how)
+{
+	struct sock *sk = sock->sk;
+	int err = 0;
+
+	BT_DBG("sock %p, sk %p", sock, sk);
+
+	if (!sk)
+		return 0;
+
+	lock_sock(sk);
+	if (!sk->sk_shutdown) {
+		if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM)
+			err = __l2cap_wait_ack(sk);
+
+		sk->sk_shutdown = SHUTDOWN_MASK;
+		l2cap_sock_clear_timer(sk);
+		__l2cap_sock_close(sk, 0);
+
+		if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
+			err = bt_sock_wait_state(sk, BT_CLOSED,
+							sk->sk_lingertime);
+	}
+
+	if (!err && sk->sk_err)
+		err = -sk->sk_err;
+
+	release_sock(sk);
+	return err;
+}
+
+static int l2cap_sock_release(struct socket *sock)
+{
+	struct sock *sk = sock->sk;
+	int err;
+
+	BT_DBG("sock %p, sk %p", sock, sk);
+
+	if (!sk)
+		return 0;
+
+	err = l2cap_sock_shutdown(sock, 2);
+
+	sock_orphan(sk);
+	l2cap_sock_kill(sk);
+	return err;
+}
+
+static void l2cap_chan_ready(struct sock *sk)
+{
+	struct sock *parent = bt_sk(sk)->parent;
+
+	BT_DBG("sk %p, parent %p", sk, parent);
+
+	l2cap_pi(sk)->conf_state = 0;
+	l2cap_sock_clear_timer(sk);
+
+	if (!parent) {
+		/* Outgoing channel.
+		 * Wake up socket sleeping on connect.
+		 */
+		sk->sk_state = BT_CONNECTED;
+		sk->sk_state_change(sk);
+	} else {
+		/* Incoming channel.
+		 * Wake up socket sleeping on accept.
+		 */
+		parent->sk_data_ready(parent, 0);
+	}
+}
+
+/* Copy frame to all raw sockets on that connection */
+static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
+{
+	struct l2cap_chan_list *l = &conn->chan_list;
+	struct sk_buff *nskb;
+	struct sock *sk;
+
+	BT_DBG("conn %p", conn);
+
+	read_lock(&l->lock);
+	for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
+		if (sk->sk_type != SOCK_RAW)
+			continue;
+
+		/* Don't send frame to the socket it came from */
+		if (skb->sk == sk)
+			continue;
+		nskb = skb_clone(skb, GFP_ATOMIC);
+		if (!nskb)
+			continue;
+
+		if (sock_queue_rcv_skb(sk, nskb))
+			kfree_skb(nskb);
+	}
+	read_unlock(&l->lock);
+}
+
+/* ---- L2CAP signalling commands ---- */
+static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
+				u8 code, u8 ident, u16 dlen, void *data)
+{
+	struct sk_buff *skb, **frag;
+	struct l2cap_cmd_hdr *cmd;
+	struct l2cap_hdr *lh;
+	int len, count;
+
+	BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d",
+			conn, code, ident, dlen);
+
+	len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
+	count = min_t(unsigned int, conn->mtu, len);
+
+	skb = bt_skb_alloc(count, GFP_ATOMIC);
+	if (!skb)
+		return NULL;
+
+	lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
+	lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
+	lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING);
+
+	cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
+	cmd->code  = code;
+	cmd->ident = ident;
+	cmd->len   = cpu_to_le16(dlen);
+
+	if (dlen) {
+		count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
+		memcpy(skb_put(skb, count), data, count);
+		data += count;
+	}
+
+	len -= skb->len;
+
+	/* Continuation fragments (no L2CAP header) */
+	frag = &skb_shinfo(skb)->frag_list;
+	while (len) {
+		count = min_t(unsigned int, conn->mtu, len);
+
+		*frag = bt_skb_alloc(count, GFP_ATOMIC);
+		if (!*frag)
+			goto fail;
+
+		memcpy(skb_put(*frag, count), data, count);
+
+		len  -= count;
+		data += count;
+
+		frag = &(*frag)->next;
+	}
+
+	return skb;
+
+fail:
+	kfree_skb(skb);
+	return NULL;
+}
+
+static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val)
+{
+	struct l2cap_conf_opt *opt = *ptr;
+	int len;
+
+	len = L2CAP_CONF_OPT_SIZE + opt->len;
+	*ptr += len;
+
+	*type = opt->type;
+	*olen = opt->len;
+
+	switch (opt->len) {
+	case 1:
+		*val = *((u8 *) opt->val);
+		break;
+
+	case 2:
+		*val = get_unaligned_le16(opt->val);
+		break;
+
+	case 4:
+		*val = get_unaligned_le32(opt->val);
+		break;
+
+	default:
+		*val = (unsigned long) opt->val;
+		break;
+	}
+
+	BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val);
+	return len;
+}
+
+static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
+{
+	struct l2cap_conf_opt *opt = *ptr;
+
+	BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val);
+
+	opt->type = type;
+	opt->len  = len;
+
+	switch (len) {
+	case 1:
+		*((u8 *) opt->val)  = val;
+		break;
+
+	case 2:
+		put_unaligned_le16(val, opt->val);
+		break;
+
+	case 4:
+		put_unaligned_le32(val, opt->val);
+		break;
+
+	default:
+		memcpy(opt->val, (void *) val, len);
+		break;
+	}
+
+	*ptr += L2CAP_CONF_OPT_SIZE + len;
+}
+
+static void l2cap_ack_timeout(unsigned long arg)
+{
+	struct sock *sk = (void *) arg;
+
+	bh_lock_sock(sk);
+	l2cap_send_ack(l2cap_pi(sk));
+	bh_unlock_sock(sk);
+}
+
+static inline void l2cap_ertm_init(struct sock *sk)
+{
+	l2cap_pi(sk)->expected_ack_seq = 0;
+	l2cap_pi(sk)->unacked_frames = 0;
+	l2cap_pi(sk)->buffer_seq = 0;
+	l2cap_pi(sk)->num_acked = 0;
+	l2cap_pi(sk)->frames_sent = 0;
+
+	setup_timer(&l2cap_pi(sk)->retrans_timer,
+			l2cap_retrans_timeout, (unsigned long) sk);
+	setup_timer(&l2cap_pi(sk)->monitor_timer,
+			l2cap_monitor_timeout, (unsigned long) sk);
+	setup_timer(&l2cap_pi(sk)->ack_timer,
+			l2cap_ack_timeout, (unsigned long) sk);
+
+	__skb_queue_head_init(SREJ_QUEUE(sk));
+	__skb_queue_head_init(BUSY_QUEUE(sk));
+
+	INIT_WORK(&l2cap_pi(sk)->busy_work, l2cap_busy_work);
+
+	sk->sk_backlog_rcv = l2cap_ertm_data_rcv;
+}
+
+static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
+{
+	switch (mode) {
+	case L2CAP_MODE_STREAMING:
+	case L2CAP_MODE_ERTM:
+		if (l2cap_mode_supported(mode, remote_feat_mask))
+			return mode;
+		/* fall through */
+	default:
+		return L2CAP_MODE_BASIC;
+	}
+}
+
+static int l2cap_build_conf_req(struct sock *sk, void *data)
+{
+	struct l2cap_pinfo *pi = l2cap_pi(sk);
+	struct l2cap_conf_req *req = data;
+	struct l2cap_conf_rfc rfc = { .mode = pi->mode };
+	void *ptr = req->data;
+
+	BT_DBG("sk %p", sk);
+
+	if (pi->num_conf_req || pi->num_conf_rsp)
+		goto done;
+
+	switch (pi->mode) {
+	case L2CAP_MODE_STREAMING:
+	case L2CAP_MODE_ERTM:
+		if (pi->conf_state & L2CAP_CONF_STATE2_DEVICE)
+			break;
+
+		/* fall through */
+	default:
+		pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask);
+		break;
+	}
+
+done:
+	if (pi->imtu != L2CAP_DEFAULT_MTU)
+		l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu);
+
+	switch (pi->mode) {
+	case L2CAP_MODE_BASIC:
+		if (!(pi->conn->feat_mask & L2CAP_FEAT_ERTM) &&
+				!(pi->conn->feat_mask & L2CAP_FEAT_STREAMING))
+			break;
+
+		rfc.mode            = L2CAP_MODE_BASIC;
+		rfc.txwin_size      = 0;
+		rfc.max_transmit    = 0;
+		rfc.retrans_timeout = 0;
+		rfc.monitor_timeout = 0;
+		rfc.max_pdu_size    = 0;
+
+		l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
+							(unsigned long) &rfc);
+		break;
+
+	case L2CAP_MODE_ERTM:
+		rfc.mode            = L2CAP_MODE_ERTM;
+		rfc.txwin_size      = pi->tx_win;
+		rfc.max_transmit    = pi->max_tx;
+		rfc.retrans_timeout = 0;
+		rfc.monitor_timeout = 0;
+		rfc.max_pdu_size    = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
+		if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10)
+			rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10);
+
+		l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
+							(unsigned long) &rfc);
+
+		if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS))
+			break;
+
+		if (pi->fcs == L2CAP_FCS_NONE ||
+				pi->conf_state & L2CAP_CONF_NO_FCS_RECV) {
+			pi->fcs = L2CAP_FCS_NONE;
+			l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs);
+		}
+		break;
+
+	case L2CAP_MODE_STREAMING:
+		rfc.mode            = L2CAP_MODE_STREAMING;
+		rfc.txwin_size      = 0;
+		rfc.max_transmit    = 0;
+		rfc.retrans_timeout = 0;
+		rfc.monitor_timeout = 0;
+		rfc.max_pdu_size    = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
+		if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10)
+			rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10);
+
+		l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
+							(unsigned long) &rfc);
+
+		if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS))
+			break;
+
+		if (pi->fcs == L2CAP_FCS_NONE ||
+				pi->conf_state & L2CAP_CONF_NO_FCS_RECV) {
+			pi->fcs = L2CAP_FCS_NONE;
+			l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs);
+		}
+		break;
+	}
+
+	/* FIXME: Need actual value of the flush timeout */
+	//if (flush_to != L2CAP_DEFAULT_FLUSH_TO)
+	//   l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 2, pi->flush_to);
+
+	req->dcid  = cpu_to_le16(pi->dcid);
+	req->flags = cpu_to_le16(0);
+
+	return ptr - data;
+}
+
+static int l2cap_parse_conf_req(struct sock *sk, void *data)
+{
+	struct l2cap_pinfo *pi = l2cap_pi(sk);
+	struct l2cap_conf_rsp *rsp = data;
+	void *ptr = rsp->data;
+	void *req = pi->conf_req;
+	int len = pi->conf_len;
+	int type, hint, olen;
+	unsigned long val;
+	struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
+	u16 mtu = L2CAP_DEFAULT_MTU;
+	u16 result = L2CAP_CONF_SUCCESS;
+
+	BT_DBG("sk %p", sk);
+
+	while (len >= L2CAP_CONF_OPT_SIZE) {
+		len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
+
+		hint  = type & L2CAP_CONF_HINT;
+		type &= L2CAP_CONF_MASK;
+
+		switch (type) {
+		case L2CAP_CONF_MTU:
+			mtu = val;
+			break;
+
+		case L2CAP_CONF_FLUSH_TO:
+			pi->flush_to = val;
+			break;
+
+		case L2CAP_CONF_QOS:
+			break;
+
+		case L2CAP_CONF_RFC:
+			if (olen == sizeof(rfc))
+				memcpy(&rfc, (void *) val, olen);
+			break;
+
+		case L2CAP_CONF_FCS:
+			if (val == L2CAP_FCS_NONE)
+				pi->conf_state |= L2CAP_CONF_NO_FCS_RECV;
+
+			break;
+
+		default:
+			if (hint)
+				break;
+
+			result = L2CAP_CONF_UNKNOWN;
+			*((u8 *) ptr++) = type;
+			break;
+		}
+	}
+
+	if (pi->num_conf_rsp || pi->num_conf_req > 1)
+		goto done;
+
+	switch (pi->mode) {
+	case L2CAP_MODE_STREAMING:
+	case L2CAP_MODE_ERTM:
+		if (!(pi->conf_state & L2CAP_CONF_STATE2_DEVICE)) {
+			pi->mode = l2cap_select_mode(rfc.mode,
+					pi->conn->feat_mask);
+			break;
+		}
+
+		if (pi->mode != rfc.mode)
+			return -ECONNREFUSED;
+
+		break;
+	}
+
+done:
+	if (pi->mode != rfc.mode) {
+		result = L2CAP_CONF_UNACCEPT;
+		rfc.mode = pi->mode;
+
+		if (pi->num_conf_rsp == 1)
+			return -ECONNREFUSED;
+
+		l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
+					sizeof(rfc), (unsigned long) &rfc);
+	}
+
+
+	if (result == L2CAP_CONF_SUCCESS) {
+		/* Configure output options and let the other side know
+		 * which ones we don't like. */
+
+		if (mtu < L2CAP_DEFAULT_MIN_MTU)
+			result = L2CAP_CONF_UNACCEPT;
+		else {
+			pi->omtu = mtu;
+			pi->conf_state |= L2CAP_CONF_MTU_DONE;
+		}
+		l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu);
+
+		switch (rfc.mode) {
+		case L2CAP_MODE_BASIC:
+			pi->fcs = L2CAP_FCS_NONE;
+			pi->conf_state |= L2CAP_CONF_MODE_DONE;
+			break;
+
+		case L2CAP_MODE_ERTM:
+			pi->remote_tx_win = rfc.txwin_size;
+			pi->remote_max_tx = rfc.max_transmit;
+
+			if (le16_to_cpu(rfc.max_pdu_size) > pi->conn->mtu - 10)
+				rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10);
+
+			pi->remote_mps = le16_to_cpu(rfc.max_pdu_size);
+
+			rfc.retrans_timeout =
+				le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO);
+			rfc.monitor_timeout =
+				le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO);
+
+			pi->conf_state |= L2CAP_CONF_MODE_DONE;
+
+			l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
+					sizeof(rfc), (unsigned long) &rfc);
+
+			break;
+
+		case L2CAP_MODE_STREAMING:
+			if (le16_to_cpu(rfc.max_pdu_size) > pi->conn->mtu - 10)
+				rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10);
+
+			pi->remote_mps = le16_to_cpu(rfc.max_pdu_size);
+
+			pi->conf_state |= L2CAP_CONF_MODE_DONE;
+
+			l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
+					sizeof(rfc), (unsigned long) &rfc);
+
+			break;
+
+		default:
+			result = L2CAP_CONF_UNACCEPT;
+
+			memset(&rfc, 0, sizeof(rfc));
+			rfc.mode = pi->mode;
+		}
+
+		if (result == L2CAP_CONF_SUCCESS)
+			pi->conf_state |= L2CAP_CONF_OUTPUT_DONE;
+	}
+	rsp->scid   = cpu_to_le16(pi->dcid);
+	rsp->result = cpu_to_le16(result);
+	rsp->flags  = cpu_to_le16(0x0000);
+
+	return ptr - data;
+}
+
+static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result)
+{
+	struct l2cap_pinfo *pi = l2cap_pi(sk);
+	struct l2cap_conf_req *req = data;
+	void *ptr = req->data;
+	int type, olen;
+	unsigned long val;
+	struct l2cap_conf_rfc rfc;
+
+	BT_DBG("sk %p, rsp %p, len %d, req %p", sk, rsp, len, data);
+
+	while (len >= L2CAP_CONF_OPT_SIZE) {
+		len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
+
+		switch (type) {
+		case L2CAP_CONF_MTU:
+			if (val < L2CAP_DEFAULT_MIN_MTU) {
+				*result = L2CAP_CONF_UNACCEPT;
+				pi->imtu = L2CAP_DEFAULT_MIN_MTU;
+			} else
+				pi->imtu = val;
+			l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu);
+			break;
+
+		case L2CAP_CONF_FLUSH_TO:
+			pi->flush_to = val;
+			l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
+							2, pi->flush_to);
+			break;
+
+		case L2CAP_CONF_RFC:
+			if (olen == sizeof(rfc))
+				memcpy(&rfc, (void *)val, olen);
+
+			if ((pi->conf_state & L2CAP_CONF_STATE2_DEVICE) &&
+							rfc.mode != pi->mode)
+				return -ECONNREFUSED;
+
+			pi->fcs = 0;
+
+			l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
+					sizeof(rfc), (unsigned long) &rfc);
+			break;
+		}
+	}
+
+	if (pi->mode == L2CAP_MODE_BASIC && pi->mode != rfc.mode)
+		return -ECONNREFUSED;
+
+	pi->mode = rfc.mode;
+
+	if (*result == L2CAP_CONF_SUCCESS) {
+		switch (rfc.mode) {
+		case L2CAP_MODE_ERTM:
+			pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
+			pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
+			pi->mps    = le16_to_cpu(rfc.max_pdu_size);
+			break;
+		case L2CAP_MODE_STREAMING:
+			pi->mps    = le16_to_cpu(rfc.max_pdu_size);
+		}
+	}
+
+	req->dcid   = cpu_to_le16(pi->dcid);
+	req->flags  = cpu_to_le16(0x0000);
+
+	return ptr - data;
+}
+
+static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags)
+{
+	struct l2cap_conf_rsp *rsp = data;
+	void *ptr = rsp->data;
+
+	BT_DBG("sk %p", sk);
+
+	rsp->scid   = cpu_to_le16(l2cap_pi(sk)->dcid);
+	rsp->result = cpu_to_le16(result);
+	rsp->flags  = cpu_to_le16(flags);
+
+	return ptr - data;
+}
+
+static void l2cap_conf_rfc_get(struct sock *sk, void *rsp, int len)
+{
+	struct l2cap_pinfo *pi = l2cap_pi(sk);
+	int type, olen;
+	unsigned long val;
+	struct l2cap_conf_rfc rfc;
+
+	BT_DBG("sk %p, rsp %p, len %d", sk, rsp, len);
+
+	if ((pi->mode != L2CAP_MODE_ERTM) && (pi->mode != L2CAP_MODE_STREAMING))
+		return;
+
+	while (len >= L2CAP_CONF_OPT_SIZE) {
+		len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
+
+		switch (type) {
+		case L2CAP_CONF_RFC:
+			if (olen == sizeof(rfc))
+				memcpy(&rfc, (void *)val, olen);
+			goto done;
+		}
+	}
+
+done:
+	switch (rfc.mode) {
+	case L2CAP_MODE_ERTM:
+		pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
+		pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
+		pi->mps    = le16_to_cpu(rfc.max_pdu_size);
+		break;
+	case L2CAP_MODE_STREAMING:
+		pi->mps    = le16_to_cpu(rfc.max_pdu_size);
+	}
+}
+
+static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
+{
+	struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data;
+
+	if (rej->reason != 0x0000)
+		return 0;
+
+	if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
+					cmd->ident == conn->info_ident) {
+		del_timer(&conn->info_timer);
+
+		conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
+		conn->info_ident = 0;
+
+		l2cap_conn_start(conn);
+	}
+
+	return 0;
+}
+
+static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
+{
+	struct l2cap_chan_list *list = &conn->chan_list;
+	struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
+	struct l2cap_conn_rsp rsp;
+	struct sock *parent, *sk = NULL;
+	int result, status = L2CAP_CS_NO_INFO;
+
+	u16 dcid = 0, scid = __le16_to_cpu(req->scid);
+	__le16 psm = req->psm;
+
+	BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid);
+
+	/* Check if we have socket listening on psm */
+	parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src);
+	if (!parent) {
+		result = L2CAP_CR_BAD_PSM;
+		goto sendresp;
+	}
+
+	bh_lock_sock(parent);
+
+	/* Check if the ACL is secure enough (if not SDP) */
+	if (psm != cpu_to_le16(0x0001) &&
+				!hci_conn_check_link_mode(conn->hcon)) {
+		conn->disc_reason = 0x05;
+		result = L2CAP_CR_SEC_BLOCK;
+		goto response;
+	}
+
+	result = L2CAP_CR_NO_MEM;
+
+	/* Check for backlog size */
+	if (sk_acceptq_is_full(parent)) {
+		BT_DBG("backlog full %d", parent->sk_ack_backlog);
+		goto response;
+	}
+
+	sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC);
+	if (!sk)
+		goto response;
+
+	write_lock_bh(&list->lock);
+
+	/* Check if we already have channel with that dcid */
+	if (__l2cap_get_chan_by_dcid(list, scid)) {
+		write_unlock_bh(&list->lock);
+		sock_set_flag(sk, SOCK_ZAPPED);
+		l2cap_sock_kill(sk);
+		goto response;
+	}
+
+	hci_conn_hold(conn->hcon);
+
+	l2cap_sock_init(sk, parent);
+	bacpy(&bt_sk(sk)->src, conn->src);
+	bacpy(&bt_sk(sk)->dst, conn->dst);
+	l2cap_pi(sk)->psm  = psm;
+	l2cap_pi(sk)->dcid = scid;
+
+	__l2cap_chan_add(conn, sk, parent);
+	dcid = l2cap_pi(sk)->scid;
+
+	l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
+
+	l2cap_pi(sk)->ident = cmd->ident;
+
+	if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
+		if (l2cap_check_security(sk)) {
+			if (bt_sk(sk)->defer_setup) {
+				sk->sk_state = BT_CONNECT2;
+				result = L2CAP_CR_PEND;
+				status = L2CAP_CS_AUTHOR_PEND;
+				parent->sk_data_ready(parent, 0);
+			} else {
+				sk->sk_state = BT_CONFIG;
+				result = L2CAP_CR_SUCCESS;
+				status = L2CAP_CS_NO_INFO;
+			}
+		} else {
+			sk->sk_state = BT_CONNECT2;
+			result = L2CAP_CR_PEND;
+			status = L2CAP_CS_AUTHEN_PEND;
+		}
+	} else {
+		sk->sk_state = BT_CONNECT2;
+		result = L2CAP_CR_PEND;
+		status = L2CAP_CS_NO_INFO;
+	}
+
+	write_unlock_bh(&list->lock);
+
+response:
+	bh_unlock_sock(parent);
+
+sendresp:
+	rsp.scid   = cpu_to_le16(scid);
+	rsp.dcid   = cpu_to_le16(dcid);
+	rsp.result = cpu_to_le16(result);
+	rsp.status = cpu_to_le16(status);
+	l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
+
+	if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
+		struct l2cap_info_req info;
+		info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
+
+		conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
+		conn->info_ident = l2cap_get_ident(conn);
+
+		mod_timer(&conn->info_timer, jiffies +
+					msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
+
+		l2cap_send_cmd(conn, conn->info_ident,
+					L2CAP_INFO_REQ, sizeof(info), &info);
+	}
+
+	if (sk && !(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) &&
+				result == L2CAP_CR_SUCCESS) {
+		u8 buf[128];
+		l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
+		l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
+					l2cap_build_conf_req(sk, buf), buf);
+		l2cap_pi(sk)->num_conf_req++;
+	}
+
+	return 0;
+}
+
+static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
+{
+	struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
+	u16 scid, dcid, result, status;
+	struct sock *sk;
+	u8 req[128];
+
+	scid   = __le16_to_cpu(rsp->scid);
+	dcid   = __le16_to_cpu(rsp->dcid);
+	result = __le16_to_cpu(rsp->result);
+	status = __le16_to_cpu(rsp->status);
+
+	BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status);
+
+	if (scid) {
+		sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
+		if (!sk)
+			return -EFAULT;
+	} else {
+		sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident);
+		if (!sk)
+			return -EFAULT;
+	}
+
+	switch (result) {
+	case L2CAP_CR_SUCCESS:
+		sk->sk_state = BT_CONFIG;
+		l2cap_pi(sk)->ident = 0;
+		l2cap_pi(sk)->dcid = dcid;
+		l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND;
+
+		if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)
+			break;
+
+		l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
+
+		l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
+					l2cap_build_conf_req(sk, req), req);
+		l2cap_pi(sk)->num_conf_req++;
+		break;
+
+	case L2CAP_CR_PEND:
+		l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
+		break;
+
+	default:
+		/* don't delete l2cap channel if sk is owned by user */
+		if (sock_owned_by_user(sk)) {
+			sk->sk_state = BT_DISCONN;
+			l2cap_sock_clear_timer(sk);
+			l2cap_sock_set_timer(sk, HZ / 5);
+			break;
+		}
+
+		l2cap_chan_del(sk, ECONNREFUSED);
+		break;
+	}
+
+	bh_unlock_sock(sk);
+	return 0;
+}
+
+static inline void set_default_fcs(struct l2cap_pinfo *pi)
+{
+	/* FCS is enabled only in ERTM or streaming mode, if one or both
+	 * sides request it.
+	 */
+	if (pi->mode != L2CAP_MODE_ERTM && pi->mode != L2CAP_MODE_STREAMING)
+		pi->fcs = L2CAP_FCS_NONE;
+	else if (!(pi->conf_state & L2CAP_CONF_NO_FCS_RECV))
+		pi->fcs = L2CAP_FCS_CRC16;
+}
+
+static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
+{
+	struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
+	u16 dcid, flags;
+	u8 rsp[64];
+	struct sock *sk;
+	int len;
+
+	dcid  = __le16_to_cpu(req->dcid);
+	flags = __le16_to_cpu(req->flags);
+
+	BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
+
+	sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid);
+	if (!sk)
+		return -ENOENT;
+
+	if (sk->sk_state != BT_CONFIG) {
+		struct l2cap_cmd_rej rej;
+
+		rej.reason = cpu_to_le16(0x0002);
+		l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
+				sizeof(rej), &rej);
+		goto unlock;
+	}
+
+	/* Reject if config buffer is too small. */
+	len = cmd_len - sizeof(*req);
+	if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) {
+		l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
+				l2cap_build_conf_rsp(sk, rsp,
+					L2CAP_CONF_REJECT, flags), rsp);
+		goto unlock;
+	}
+
+	/* Store config. */
+	memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len);
+	l2cap_pi(sk)->conf_len += len;
+
+	if (flags & 0x0001) {
+		/* Incomplete config. Send empty response. */
+		l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
+				l2cap_build_conf_rsp(sk, rsp,
+					L2CAP_CONF_SUCCESS, 0x0001), rsp);
+		goto unlock;
+	}
+
+	/* Complete config. */
+	len = l2cap_parse_conf_req(sk, rsp);
+	if (len < 0) {
+		l2cap_send_disconn_req(conn, sk, ECONNRESET);
+		goto unlock;
+	}
+
+	l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
+	l2cap_pi(sk)->num_conf_rsp++;
+
+	/* Reset config buffer. */
+	l2cap_pi(sk)->conf_len = 0;
+
+	if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE))
+		goto unlock;
+
+	if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) {
+		set_default_fcs(l2cap_pi(sk));
+
+		sk->sk_state = BT_CONNECTED;
+
+		l2cap_pi(sk)->next_tx_seq = 0;
+		l2cap_pi(sk)->expected_tx_seq = 0;
+		__skb_queue_head_init(TX_QUEUE(sk));
+		if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM)
+			l2cap_ertm_init(sk);
+
+		l2cap_chan_ready(sk);
+		goto unlock;
+	}
+
+	if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) {
+		u8 buf[64];
+		l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
+		l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
+					l2cap_build_conf_req(sk, buf), buf);
+		l2cap_pi(sk)->num_conf_req++;
+	}
+
+unlock:
+	bh_unlock_sock(sk);
+	return 0;
+}
+
+static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
+{
+	struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
+	u16 scid, flags, result;
+	struct sock *sk;
+	int len = cmd->len - sizeof(*rsp);
+
+	scid   = __le16_to_cpu(rsp->scid);
+	flags  = __le16_to_cpu(rsp->flags);
+	result = __le16_to_cpu(rsp->result);
+
+	BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x",
+			scid, flags, result);
+
+	sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
+	if (!sk)
+		return 0;
+
+	switch (result) {
+	case L2CAP_CONF_SUCCESS:
+		l2cap_conf_rfc_get(sk, rsp->data, len);
+		break;
+
+	case L2CAP_CONF_UNACCEPT:
+		if (l2cap_pi(sk)->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
+			char req[64];
+
+			if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
+				l2cap_send_disconn_req(conn, sk, ECONNRESET);
+				goto done;
+			}
+
+			/* throw out any old stored conf requests */
+			result = L2CAP_CONF_SUCCESS;
+			len = l2cap_parse_conf_rsp(sk, rsp->data,
+							len, req, &result);
+			if (len < 0) {
+				l2cap_send_disconn_req(conn, sk, ECONNRESET);
+				goto done;
+			}
+
+			l2cap_send_cmd(conn, l2cap_get_ident(conn),
+						L2CAP_CONF_REQ, len, req);
+			l2cap_pi(sk)->num_conf_req++;
+			if (result != L2CAP_CONF_SUCCESS)
+				goto done;
+			break;
+		}
+
+	default:
+		sk->sk_err = ECONNRESET;
+		l2cap_sock_set_timer(sk, HZ * 5);
+		l2cap_send_disconn_req(conn, sk, ECONNRESET);
+		goto done;
+	}
+
+	if (flags & 0x01)
+		goto done;
+
+	l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE;
+
+	if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) {
+		set_default_fcs(l2cap_pi(sk));
+
+		sk->sk_state = BT_CONNECTED;
+		l2cap_pi(sk)->next_tx_seq = 0;
+		l2cap_pi(sk)->expected_tx_seq = 0;
+		__skb_queue_head_init(TX_QUEUE(sk));
+		if (l2cap_pi(sk)->mode ==  L2CAP_MODE_ERTM)
+			l2cap_ertm_init(sk);
+
+		l2cap_chan_ready(sk);
+	}
+
+done:
+	bh_unlock_sock(sk);
+	return 0;
+}
+
+static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
+{
+	struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
+	struct l2cap_disconn_rsp rsp;
+	u16 dcid, scid;
+	struct sock *sk;
+
+	scid = __le16_to_cpu(req->scid);
+	dcid = __le16_to_cpu(req->dcid);
+
+	BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
+
+	sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid);
+	if (!sk)
+		return 0;
+
+	rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
+	rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
+	l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
+
+	sk->sk_shutdown = SHUTDOWN_MASK;
+
+	/* don't delete l2cap channel if sk is owned by user */
+	if (sock_owned_by_user(sk)) {
+		sk->sk_state = BT_DISCONN;
+		l2cap_sock_clear_timer(sk);
+		l2cap_sock_set_timer(sk, HZ / 5);
+		bh_unlock_sock(sk);
+		return 0;
+	}
+
+	l2cap_chan_del(sk, ECONNRESET);
+	bh_unlock_sock(sk);
+
+	l2cap_sock_kill(sk);
+	return 0;
+}
+
+static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
+{
+	struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
+	u16 dcid, scid;
+	struct sock *sk;
+
+	scid = __le16_to_cpu(rsp->scid);
+	dcid = __le16_to_cpu(rsp->dcid);
+
+	BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
+
+	sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
+	if (!sk)
+		return 0;
+
+	/* don't delete l2cap channel if sk is owned by user */
+	if (sock_owned_by_user(sk)) {
+		sk->sk_state = BT_DISCONN;
+		l2cap_sock_clear_timer(sk);
+		l2cap_sock_set_timer(sk, HZ / 5);
+		bh_unlock_sock(sk);
+		return 0;
+	}
+
+	l2cap_chan_del(sk, 0);
+	bh_unlock_sock(sk);
+
+	l2cap_sock_kill(sk);
+	return 0;
+}
+
+static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
+{
+	struct l2cap_info_req *req = (struct l2cap_info_req *) data;
+	u16 type;
+
+	type = __le16_to_cpu(req->type);
+
+	BT_DBG("type 0x%4.4x", type);
+
+	if (type == L2CAP_IT_FEAT_MASK) {
+		u8 buf[8];
+		u32 feat_mask = l2cap_feat_mask;
+		struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
+		rsp->type   = cpu_to_le16(L2CAP_IT_FEAT_MASK);
+		rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
+		if (!disable_ertm)
+			feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
+							 | L2CAP_FEAT_FCS;
+		put_unaligned_le32(feat_mask, rsp->data);
+		l2cap_send_cmd(conn, cmd->ident,
+					L2CAP_INFO_RSP, sizeof(buf), buf);
+	} else if (type == L2CAP_IT_FIXED_CHAN) {
+		u8 buf[12];
+		struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
+		rsp->type   = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
+		rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
+		memcpy(buf + 4, l2cap_fixed_chan, 8);
+		l2cap_send_cmd(conn, cmd->ident,
+					L2CAP_INFO_RSP, sizeof(buf), buf);
+	} else {
+		struct l2cap_info_rsp rsp;
+		rsp.type   = cpu_to_le16(type);
+		rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
+		l2cap_send_cmd(conn, cmd->ident,
+					L2CAP_INFO_RSP, sizeof(rsp), &rsp);
+	}
+
+	return 0;
+}
+
+static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
+{
+	struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
+	u16 type, result;
+
+	type   = __le16_to_cpu(rsp->type);
+	result = __le16_to_cpu(rsp->result);
+
+	BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
+
+	del_timer(&conn->info_timer);
+
+	if (result != L2CAP_IR_SUCCESS) {
+		conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
+		conn->info_ident = 0;
+
+		l2cap_conn_start(conn);
+
+		return 0;
+	}
+
+	if (type == L2CAP_IT_FEAT_MASK) {
+		conn->feat_mask = get_unaligned_le32(rsp->data);
+
+		if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
+			struct l2cap_info_req req;
+			req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
+
+			conn->info_ident = l2cap_get_ident(conn);
+
+			l2cap_send_cmd(conn, conn->info_ident,
+					L2CAP_INFO_REQ, sizeof(req), &req);
+		} else {
+			conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
+			conn->info_ident = 0;
+
+			l2cap_conn_start(conn);
+		}
+	} else if (type == L2CAP_IT_FIXED_CHAN) {
+		conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
+		conn->info_ident = 0;
+
+		l2cap_conn_start(conn);
+	}
+
+	return 0;
+}
+
+static inline void l2cap_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb)
+{
+	u8 *data = skb->data;
+	int len = skb->len;
+	struct l2cap_cmd_hdr cmd;
+	int err = 0;
+
+	l2cap_raw_recv(conn, skb);
+
+	while (len >= L2CAP_CMD_HDR_SIZE) {
+		u16 cmd_len;
+		memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
+		data += L2CAP_CMD_HDR_SIZE;
+		len  -= L2CAP_CMD_HDR_SIZE;
+
+		cmd_len = le16_to_cpu(cmd.len);
+
+		BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident);
+
+		if (cmd_len > len || !cmd.ident) {
+			BT_DBG("corrupted command");
+			break;
+		}
+
+		switch (cmd.code) {
+		case L2CAP_COMMAND_REJ:
+			l2cap_command_rej(conn, &cmd, data);
+			break;
+
+		case L2CAP_CONN_REQ:
+			err = l2cap_connect_req(conn, &cmd, data);
+			break;
+
+		case L2CAP_CONN_RSP:
+			err = l2cap_connect_rsp(conn, &cmd, data);
+			break;
+
+		case L2CAP_CONF_REQ:
+			err = l2cap_config_req(conn, &cmd, cmd_len, data);
+			break;
+
+		case L2CAP_CONF_RSP:
+			err = l2cap_config_rsp(conn, &cmd, data);
+			break;
+
+		case L2CAP_DISCONN_REQ:
+			err = l2cap_disconnect_req(conn, &cmd, data);
+			break;
+
+		case L2CAP_DISCONN_RSP:
+			err = l2cap_disconnect_rsp(conn, &cmd, data);
+			break;
+
+		case L2CAP_ECHO_REQ:
+			l2cap_send_cmd(conn, cmd.ident, L2CAP_ECHO_RSP, cmd_len, data);
+			break;
+
+		case L2CAP_ECHO_RSP:
+			break;
+
+		case L2CAP_INFO_REQ:
+			err = l2cap_information_req(conn, &cmd, data);
+			break;
+
+		case L2CAP_INFO_RSP:
+			err = l2cap_information_rsp(conn, &cmd, data);
+			break;
+
+		default:
+			BT_ERR("Unknown signaling command 0x%2.2x", cmd.code);
+			err = -EINVAL;
+			break;
+		}
+
+		if (err) {
+			struct l2cap_cmd_rej rej;
+			BT_DBG("error %d", err);
+
+			/* FIXME: Map err to a valid reason */
+			rej.reason = cpu_to_le16(0);
+			l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
+		}
+
+		data += cmd_len;
+		len  -= cmd_len;
+	}
+
+	kfree_skb(skb);
+}
+
+static int l2cap_check_fcs(struct l2cap_pinfo *pi,  struct sk_buff *skb)
+{
+	u16 our_fcs, rcv_fcs;
+	int hdr_size = L2CAP_HDR_SIZE + 2;
+
+	if (pi->fcs == L2CAP_FCS_CRC16) {
+		skb_trim(skb, skb->len - 2);
+		rcv_fcs = get_unaligned_le16(skb->data + skb->len);
+		our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
+
+		if (our_fcs != rcv_fcs)
+			return -EBADMSG;
+	}
+	return 0;
+}
+
+static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk)
+{
+	struct l2cap_pinfo *pi = l2cap_pi(sk);
+	u16 control = 0;
+
+	pi->frames_sent = 0;
+
+	control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
+
+	if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
+		control |= L2CAP_SUPER_RCV_NOT_READY;
+		l2cap_send_sframe(pi, control);
+		pi->conn_state |= L2CAP_CONN_RNR_SENT;
+	}
+
+	if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY)
+		l2cap_retransmit_frames(sk);
+
+	l2cap_ertm_send(sk);
+
+	if (!(pi->conn_state & L2CAP_CONN_LOCAL_BUSY) &&
+			pi->frames_sent == 0) {
+		control |= L2CAP_SUPER_RCV_READY;
+		l2cap_send_sframe(pi, control);
+	}
+}
+
+static int l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar)
+{
+	struct sk_buff *next_skb;
+	struct l2cap_pinfo *pi = l2cap_pi(sk);
+	int tx_seq_offset, next_tx_seq_offset;
+
+	bt_cb(skb)->tx_seq = tx_seq;
+	bt_cb(skb)->sar = sar;
+
+	next_skb = skb_peek(SREJ_QUEUE(sk));
+	if (!next_skb) {
+		__skb_queue_tail(SREJ_QUEUE(sk), skb);
+		return 0;
+	}
+
+	tx_seq_offset = (tx_seq - pi->buffer_seq) % 64;
+	if (tx_seq_offset < 0)
+		tx_seq_offset += 64;
+
+	do {
+		if (bt_cb(next_skb)->tx_seq == tx_seq)
+			return -EINVAL;
+
+		next_tx_seq_offset = (bt_cb(next_skb)->tx_seq -
+						pi->buffer_seq) % 64;
+		if (next_tx_seq_offset < 0)
+			next_tx_seq_offset += 64;
+
+		if (next_tx_seq_offset > tx_seq_offset) {
+			__skb_queue_before(SREJ_QUEUE(sk), next_skb, skb);
+			return 0;
+		}
+
+		if (skb_queue_is_last(SREJ_QUEUE(sk), next_skb))
+			break;
+
+	} while ((next_skb = skb_queue_next(SREJ_QUEUE(sk), next_skb)));
+
+	__skb_queue_tail(SREJ_QUEUE(sk), skb);
+
+	return 0;
+}
+
+static int l2cap_ertm_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control)
+{
+	struct l2cap_pinfo *pi = l2cap_pi(sk);
+	struct sk_buff *_skb;
+	int err;
+
+	switch (control & L2CAP_CTRL_SAR) {
+	case L2CAP_SDU_UNSEGMENTED:
+		if (pi->conn_state & L2CAP_CONN_SAR_SDU)
+			goto drop;
+
+		err = sock_queue_rcv_skb(sk, skb);
+		if (!err)
+			return err;
+
+		break;
+
+	case L2CAP_SDU_START:
+		if (pi->conn_state & L2CAP_CONN_SAR_SDU)
+			goto drop;
+
+		pi->sdu_len = get_unaligned_le16(skb->data);
+
+		if (pi->sdu_len > pi->imtu)
+			goto disconnect;
+
+		pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC);
+		if (!pi->sdu)
+			return -ENOMEM;
+
+		/* pull sdu_len bytes only after alloc, because of Local Busy
+		 * condition we have to be sure that this will be executed
+		 * only once, i.e., when alloc does not fail */
+		skb_pull(skb, 2);
+
+		memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
+
+		pi->conn_state |= L2CAP_CONN_SAR_SDU;
+		pi->partial_sdu_len = skb->len;
+		break;
+
+	case L2CAP_SDU_CONTINUE:
+		if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
+			goto disconnect;
+
+		if (!pi->sdu)
+			goto disconnect;
+
+		pi->partial_sdu_len += skb->len;
+		if (pi->partial_sdu_len > pi->sdu_len)
+			goto drop;
+
+		memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
+
+		break;
+
+	case L2CAP_SDU_END:
+		if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
+			goto disconnect;
+
+		if (!pi->sdu)
+			goto disconnect;
+
+		if (!(pi->conn_state & L2CAP_CONN_SAR_RETRY)) {
+			pi->partial_sdu_len += skb->len;
+
+			if (pi->partial_sdu_len > pi->imtu)
+				goto drop;
+
+			if (pi->partial_sdu_len != pi->sdu_len)
+				goto drop;
+
+			memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
+		}
+
+		_skb = skb_clone(pi->sdu, GFP_ATOMIC);
+		if (!_skb) {
+			pi->conn_state |= L2CAP_CONN_SAR_RETRY;
+			return -ENOMEM;
+		}
+
+		err = sock_queue_rcv_skb(sk, _skb);
+		if (err < 0) {
+			kfree_skb(_skb);
+			pi->conn_state |= L2CAP_CONN_SAR_RETRY;
+			return err;
+		}
+
+		pi->conn_state &= ~L2CAP_CONN_SAR_RETRY;
+		pi->conn_state &= ~L2CAP_CONN_SAR_SDU;
+
+		kfree_skb(pi->sdu);
+		break;
+	}
+
+	kfree_skb(skb);
+	return 0;
+
+drop:
+	kfree_skb(pi->sdu);
+	pi->sdu = NULL;
+
+disconnect:
+	l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
+	kfree_skb(skb);
+	return 0;
+}
+
+static int l2cap_try_push_rx_skb(struct sock *sk)
+{
+	struct l2cap_pinfo *pi = l2cap_pi(sk);
+	struct sk_buff *skb;
+	u16 control;
+	int err;
+
+	while ((skb = skb_dequeue(BUSY_QUEUE(sk)))) {
+		control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT;
+		err = l2cap_ertm_reassembly_sdu(sk, skb, control);
+		if (err < 0) {
+			skb_queue_head(BUSY_QUEUE(sk), skb);
+			return -EBUSY;
+		}
+
+		pi->buffer_seq = (pi->buffer_seq + 1) % 64;
+	}
+
+	if (!(pi->conn_state & L2CAP_CONN_RNR_SENT))
+		goto done;
+
+	control = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
+	control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL;
+	l2cap_send_sframe(pi, control);
+	l2cap_pi(sk)->retry_count = 1;
+
+	del_timer(&pi->retrans_timer);
+	__mod_monitor_timer();
+
+	l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F;
+
+done:
+	pi->conn_state &= ~L2CAP_CONN_LOCAL_BUSY;
+	pi->conn_state &= ~L2CAP_CONN_RNR_SENT;
+
+	BT_DBG("sk %p, Exit local busy", sk);
+
+	return 0;
+}
+
+static void l2cap_busy_work(struct work_struct *work)
+{
+	DECLARE_WAITQUEUE(wait, current);
+	struct l2cap_pinfo *pi =
+		container_of(work, struct l2cap_pinfo, busy_work);
+	struct sock *sk = (struct sock *)pi;
+	int n_tries = 0, timeo = HZ/5, err;
+	struct sk_buff *skb;
+
+	lock_sock(sk);
+
+	add_wait_queue(sk_sleep(sk), &wait);
+	while ((skb = skb_peek(BUSY_QUEUE(sk)))) {
+		set_current_state(TASK_INTERRUPTIBLE);
+
+		if (n_tries++ > L2CAP_LOCAL_BUSY_TRIES) {
+			err = -EBUSY;
+			l2cap_send_disconn_req(pi->conn, sk, EBUSY);
+			break;
+		}
+
+		if (!timeo)
+			timeo = HZ/5;
+
+		if (signal_pending(current)) {
+			err = sock_intr_errno(timeo);
+			break;
+		}
+
+		release_sock(sk);
+		timeo = schedule_timeout(timeo);
+		lock_sock(sk);
+
+		err = sock_error(sk);
+		if (err)
+			break;
+
+		if (l2cap_try_push_rx_skb(sk) == 0)
+			break;
+	}
+
+	set_current_state(TASK_RUNNING);
+	remove_wait_queue(sk_sleep(sk), &wait);
+
+	release_sock(sk);
+}
+
+static int l2cap_push_rx_skb(struct sock *sk, struct sk_buff *skb, u16 control)
+{
+	struct l2cap_pinfo *pi = l2cap_pi(sk);
+	int sctrl, err;
+
+	if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
+		bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT;
+		__skb_queue_tail(BUSY_QUEUE(sk), skb);
+		return l2cap_try_push_rx_skb(sk);
+
+
+	}
+
+	err = l2cap_ertm_reassembly_sdu(sk, skb, control);
+	if (err >= 0) {
+		pi->buffer_seq = (pi->buffer_seq + 1) % 64;
+		return err;
+	}
+
+	/* Busy Condition */
+	BT_DBG("sk %p, Enter local busy", sk);
+
+	pi->conn_state |= L2CAP_CONN_LOCAL_BUSY;
+	bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT;
+	__skb_queue_tail(BUSY_QUEUE(sk), skb);
+
+	sctrl = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
+	sctrl |= L2CAP_SUPER_RCV_NOT_READY;
+	l2cap_send_sframe(pi, sctrl);
+
+	pi->conn_state |= L2CAP_CONN_RNR_SENT;
+
+	del_timer(&pi->ack_timer);
+
+	queue_work(_busy_wq, &pi->busy_work);
+
+	return err;
+}
+
+static int l2cap_streaming_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control)
+{
+	struct l2cap_pinfo *pi = l2cap_pi(sk);
+	struct sk_buff *_skb;
+	int err = -EINVAL;
+
+	/*
+	 * TODO: We have to notify the userland if some data is lost with the
+	 * Streaming Mode.
+	 */
+
+	switch (control & L2CAP_CTRL_SAR) {
+	case L2CAP_SDU_UNSEGMENTED:
+		if (pi->conn_state & L2CAP_CONN_SAR_SDU) {
+			kfree_skb(pi->sdu);
+			break;
+		}
+
+		err = sock_queue_rcv_skb(sk, skb);
+		if (!err)
+			return 0;
+
+		break;
+
+	case L2CAP_SDU_START:
+		if (pi->conn_state & L2CAP_CONN_SAR_SDU) {
+			kfree_skb(pi->sdu);
+			break;
+		}
+
+		pi->sdu_len = get_unaligned_le16(skb->data);
+		skb_pull(skb, 2);
+
+		if (pi->sdu_len > pi->imtu) {
+			err = -EMSGSIZE;
+			break;
+		}
+
+		pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC);
+		if (!pi->sdu) {
+			err = -ENOMEM;
+			break;
+		}
+
+		memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
+
+		pi->conn_state |= L2CAP_CONN_SAR_SDU;
+		pi->partial_sdu_len = skb->len;
+		err = 0;
+		break;
+
+	case L2CAP_SDU_CONTINUE:
+		if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
+			break;
+
+		memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
+
+		pi->partial_sdu_len += skb->len;
+		if (pi->partial_sdu_len > pi->sdu_len)
+			kfree_skb(pi->sdu);
+		else
+			err = 0;
+
+		break;
+
+	case L2CAP_SDU_END:
+		if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
+			break;
+
+		memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
+
+		pi->conn_state &= ~L2CAP_CONN_SAR_SDU;
+		pi->partial_sdu_len += skb->len;
+
+		if (pi->partial_sdu_len > pi->imtu)
+			goto drop;
+
+		if (pi->partial_sdu_len == pi->sdu_len) {
+			_skb = skb_clone(pi->sdu, GFP_ATOMIC);
+			err = sock_queue_rcv_skb(sk, _skb);
+			if (err < 0)
+				kfree_skb(_skb);
+		}
+		err = 0;
+
+drop:
+		kfree_skb(pi->sdu);
+		break;
+	}
+
+	kfree_skb(skb);
+	return err;
+}
+
+static void l2cap_check_srej_gap(struct sock *sk, u8 tx_seq)
+{
+	struct sk_buff *skb;
+	u16 control;
+
+	while ((skb = skb_peek(SREJ_QUEUE(sk)))) {
+		if (bt_cb(skb)->tx_seq != tx_seq)
+			break;
+
+		skb = skb_dequeue(SREJ_QUEUE(sk));
+		control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT;
+		l2cap_ertm_reassembly_sdu(sk, skb, control);
+		l2cap_pi(sk)->buffer_seq_srej =
+			(l2cap_pi(sk)->buffer_seq_srej + 1) % 64;
+		tx_seq = (tx_seq + 1) % 64;
+	}
+}
+
+static void l2cap_resend_srejframe(struct sock *sk, u8 tx_seq)
+{
+	struct l2cap_pinfo *pi = l2cap_pi(sk);
+	struct srej_list *l, *tmp;
+	u16 control;
+
+	list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) {
+		if (l->tx_seq == tx_seq) {
+			list_del(&l->list);
+			kfree(l);
+			return;
+		}
+		control = L2CAP_SUPER_SELECT_REJECT;
+		control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
+		l2cap_send_sframe(pi, control);
+		list_del(&l->list);
+		list_add_tail(&l->list, SREJ_LIST(sk));
+	}
+}
+
+static void l2cap_send_srejframe(struct sock *sk, u8 tx_seq)
+{
+	struct l2cap_pinfo *pi = l2cap_pi(sk);
+	struct srej_list *new;
+	u16 control;
+
+	while (tx_seq != pi->expected_tx_seq) {
+		control = L2CAP_SUPER_SELECT_REJECT;
+		control |= pi->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
+		l2cap_send_sframe(pi, control);
+
+		new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC);
+		new->tx_seq = pi->expected_tx_seq;
+		pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
+		list_add_tail(&new->list, SREJ_LIST(sk));
+	}
+	pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
+}
+
+static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, struct sk_buff *skb)
+{
+	struct l2cap_pinfo *pi = l2cap_pi(sk);
+	u8 tx_seq = __get_txseq(rx_control);
+	u8 req_seq = __get_reqseq(rx_control);
+	u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT;
+	int tx_seq_offset, expected_tx_seq_offset;
+	int num_to_ack = (pi->tx_win/6) + 1;
+	int err = 0;
+
+	BT_DBG("sk %p len %d tx_seq %d rx_control 0x%4.4x", sk, skb->len, tx_seq,
+								rx_control);
+
+	if (L2CAP_CTRL_FINAL & rx_control &&
+			l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) {
+		del_timer(&pi->monitor_timer);
+		if (pi->unacked_frames > 0)
+			__mod_retrans_timer();
+		pi->conn_state &= ~L2CAP_CONN_WAIT_F;
+	}
+
+	pi->expected_ack_seq = req_seq;
+	l2cap_drop_acked_frames(sk);
+
+	if (tx_seq == pi->expected_tx_seq)
+		goto expected;
+
+	tx_seq_offset = (tx_seq - pi->buffer_seq) % 64;
+	if (tx_seq_offset < 0)
+		tx_seq_offset += 64;
+
+	/* invalid tx_seq */
+	if (tx_seq_offset >= pi->tx_win) {
+		l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
+		goto drop;
+	}
+
+	if (pi->conn_state == L2CAP_CONN_LOCAL_BUSY)
+		goto drop;
+
+	if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
+		struct srej_list *first;
+
+		first = list_first_entry(SREJ_LIST(sk),
+				struct srej_list, list);
+		if (tx_seq == first->tx_seq) {
+			l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
+			l2cap_check_srej_gap(sk, tx_seq);
+
+			list_del(&first->list);
+			kfree(first);
+
+			if (list_empty(SREJ_LIST(sk))) {
+				pi->buffer_seq = pi->buffer_seq_srej;
+				pi->conn_state &= ~L2CAP_CONN_SREJ_SENT;
+				l2cap_send_ack(pi);
+				BT_DBG("sk %p, Exit SREJ_SENT", sk);
+			}
+		} else {
+			struct srej_list *l;
+
+			/* duplicated tx_seq */
+			if (l2cap_add_to_srej_queue(sk, skb, tx_seq, sar) < 0)
+				goto drop;
+
+			list_for_each_entry(l, SREJ_LIST(sk), list) {
+				if (l->tx_seq == tx_seq) {
+					l2cap_resend_srejframe(sk, tx_seq);
+					return 0;
+				}
+			}
+			l2cap_send_srejframe(sk, tx_seq);
+		}
+	} else {
+		expected_tx_seq_offset =
+			(pi->expected_tx_seq - pi->buffer_seq) % 64;
+		if (expected_tx_seq_offset < 0)
+			expected_tx_seq_offset += 64;
+
+		/* duplicated tx_seq */
+		if (tx_seq_offset < expected_tx_seq_offset)
+			goto drop;
+
+		pi->conn_state |= L2CAP_CONN_SREJ_SENT;
+
+		BT_DBG("sk %p, Enter SREJ", sk);
+
+		INIT_LIST_HEAD(SREJ_LIST(sk));
+		pi->buffer_seq_srej = pi->buffer_seq;
+
+		__skb_queue_head_init(SREJ_QUEUE(sk));
+		__skb_queue_head_init(BUSY_QUEUE(sk));
+		l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
+
+		pi->conn_state |= L2CAP_CONN_SEND_PBIT;
+
+		l2cap_send_srejframe(sk, tx_seq);
+
+		del_timer(&pi->ack_timer);
+	}
+	return 0;
+
+expected:
+	pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
+
+	if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
+		bt_cb(skb)->tx_seq = tx_seq;
+		bt_cb(skb)->sar = sar;
+		__skb_queue_tail(SREJ_QUEUE(sk), skb);
+		return 0;
+	}
+
+	err = l2cap_push_rx_skb(sk, skb, rx_control);
+	if (err < 0)
+		return 0;
+
+	if (rx_control & L2CAP_CTRL_FINAL) {
+		if (pi->conn_state & L2CAP_CONN_REJ_ACT)
+			pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
+		else
+			l2cap_retransmit_frames(sk);
+	}
+
+	__mod_ack_timer();
+
+	pi->num_acked = (pi->num_acked + 1) % num_to_ack;
+	if (pi->num_acked == num_to_ack - 1)
+		l2cap_send_ack(pi);
+
+	return 0;
+
+drop:
+	kfree_skb(skb);
+	return 0;
+}
+
+static inline void l2cap_data_channel_rrframe(struct sock *sk, u16 rx_control)
+{
+	struct l2cap_pinfo *pi = l2cap_pi(sk);
+
+	BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, __get_reqseq(rx_control),
+						rx_control);
+
+	pi->expected_ack_seq = __get_reqseq(rx_control);
+	l2cap_drop_acked_frames(sk);
+
+	if (rx_control & L2CAP_CTRL_POLL) {
+		pi->conn_state |= L2CAP_CONN_SEND_FBIT;
+		if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
+			if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
+					(pi->unacked_frames > 0))
+				__mod_retrans_timer();
+
+			pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
+			l2cap_send_srejtail(sk);
+		} else {
+			l2cap_send_i_or_rr_or_rnr(sk);
+		}
+
+	} else if (rx_control & L2CAP_CTRL_FINAL) {
+		pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
+
+		if (pi->conn_state & L2CAP_CONN_REJ_ACT)
+			pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
+		else
+			l2cap_retransmit_frames(sk);
+
+	} else {
+		if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
+				(pi->unacked_frames > 0))
+			__mod_retrans_timer();
+
+		pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
+		if (pi->conn_state & L2CAP_CONN_SREJ_SENT)
+			l2cap_send_ack(pi);
+		else
+			l2cap_ertm_send(sk);
+	}
+}
+
+static inline void l2cap_data_channel_rejframe(struct sock *sk, u16 rx_control)
+{
+	struct l2cap_pinfo *pi = l2cap_pi(sk);
+	u8 tx_seq = __get_reqseq(rx_control);
+
+	BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control);
+
+	pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
+
+	pi->expected_ack_seq = tx_seq;
+	l2cap_drop_acked_frames(sk);
+
+	if (rx_control & L2CAP_CTRL_FINAL) {
+		if (pi->conn_state & L2CAP_CONN_REJ_ACT)
+			pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
+		else
+			l2cap_retransmit_frames(sk);
+	} else {
+		l2cap_retransmit_frames(sk);
+
+		if (pi->conn_state & L2CAP_CONN_WAIT_F)
+			pi->conn_state |= L2CAP_CONN_REJ_ACT;
+	}
+}
+static inline void l2cap_data_channel_srejframe(struct sock *sk, u16 rx_control)
+{
+	struct l2cap_pinfo *pi = l2cap_pi(sk);
+	u8 tx_seq = __get_reqseq(rx_control);
+
+	BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control);
+
+	pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
+
+	if (rx_control & L2CAP_CTRL_POLL) {
+		pi->expected_ack_seq = tx_seq;
+		l2cap_drop_acked_frames(sk);
+
+		pi->conn_state |= L2CAP_CONN_SEND_FBIT;
+		l2cap_retransmit_one_frame(sk, tx_seq);
+
+		l2cap_ertm_send(sk);
+
+		if (pi->conn_state & L2CAP_CONN_WAIT_F) {
+			pi->srej_save_reqseq = tx_seq;
+			pi->conn_state |= L2CAP_CONN_SREJ_ACT;
+		}
+	} else if (rx_control & L2CAP_CTRL_FINAL) {
+		if ((pi->conn_state & L2CAP_CONN_SREJ_ACT) &&
+				pi->srej_save_reqseq == tx_seq)
+			pi->conn_state &= ~L2CAP_CONN_SREJ_ACT;
+		else
+			l2cap_retransmit_one_frame(sk, tx_seq);
+	} else {
+		l2cap_retransmit_one_frame(sk, tx_seq);
+		if (pi->conn_state & L2CAP_CONN_WAIT_F) {
+			pi->srej_save_reqseq = tx_seq;
+			pi->conn_state |= L2CAP_CONN_SREJ_ACT;
+		}
+	}
+}
+
+static inline void l2cap_data_channel_rnrframe(struct sock *sk, u16 rx_control)
+{
+	struct l2cap_pinfo *pi = l2cap_pi(sk);
+	u8 tx_seq = __get_reqseq(rx_control);
+
+	BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control);
+
+	pi->conn_state |= L2CAP_CONN_REMOTE_BUSY;
+	pi->expected_ack_seq = tx_seq;
+	l2cap_drop_acked_frames(sk);
+
+	if (rx_control & L2CAP_CTRL_POLL)
+		pi->conn_state |= L2CAP_CONN_SEND_FBIT;
+
+	if (!(pi->conn_state & L2CAP_CONN_SREJ_SENT)) {
+		del_timer(&pi->retrans_timer);
+		if (rx_control & L2CAP_CTRL_POLL)
+			l2cap_send_rr_or_rnr(pi, L2CAP_CTRL_FINAL);
+		return;
+	}
+
+	if (rx_control & L2CAP_CTRL_POLL)
+		l2cap_send_srejtail(sk);
+	else
+		l2cap_send_sframe(pi, L2CAP_SUPER_RCV_READY);
+}
+
+static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, struct sk_buff *skb)
+{
+	BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len);
+
+	if (L2CAP_CTRL_FINAL & rx_control &&
+			l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) {
+		del_timer(&l2cap_pi(sk)->monitor_timer);
+		if (l2cap_pi(sk)->unacked_frames > 0)
+			__mod_retrans_timer();
+		l2cap_pi(sk)->conn_state &= ~L2CAP_CONN_WAIT_F;
+	}
+
+	switch (rx_control & L2CAP_CTRL_SUPERVISE) {
+	case L2CAP_SUPER_RCV_READY:
+		l2cap_data_channel_rrframe(sk, rx_control);
+		break;
+
+	case L2CAP_SUPER_REJECT:
+		l2cap_data_channel_rejframe(sk, rx_control);
+		break;
+
+	case L2CAP_SUPER_SELECT_REJECT:
+		l2cap_data_channel_srejframe(sk, rx_control);
+		break;
+
+	case L2CAP_SUPER_RCV_NOT_READY:
+		l2cap_data_channel_rnrframe(sk, rx_control);
+		break;
+	}
+
+	kfree_skb(skb);
+	return 0;
+}
+
+static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb)
+{
+	struct l2cap_pinfo *pi = l2cap_pi(sk);
+	u16 control;
+	u8 req_seq;
+	int len, next_tx_seq_offset, req_seq_offset;
+
+	control = get_unaligned_le16(skb->data);
+	skb_pull(skb, 2);
+	len = skb->len;
+
+	/*
+	 * We can just drop the corrupted I-frame here.
+	 * Receiver will miss it and start proper recovery
+	 * procedures and ask retransmission.
+	 */
+	if (l2cap_check_fcs(pi, skb))
+		goto drop;
+
+	if (__is_sar_start(control) && __is_iframe(control))
+		len -= 2;
+
+	if (pi->fcs == L2CAP_FCS_CRC16)
+		len -= 2;
+
+	if (len > pi->mps) {
+		l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
+		goto drop;
+	}
+
+	req_seq = __get_reqseq(control);
+	req_seq_offset = (req_seq - pi->expected_ack_seq) % 64;
+	if (req_seq_offset < 0)
+		req_seq_offset += 64;
+
+	next_tx_seq_offset =
+		(pi->next_tx_seq - pi->expected_ack_seq) % 64;
+	if (next_tx_seq_offset < 0)
+		next_tx_seq_offset += 64;
+
+	/* check for invalid req-seq */
+	if (req_seq_offset > next_tx_seq_offset) {
+		l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
+		goto drop;
+	}
+
+	if (__is_iframe(control)) {
+		if (len < 0) {
+			l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
+			goto drop;
+		}
+
+		l2cap_data_channel_iframe(sk, control, skb);
+	} else {
+		if (len != 0) {
+			BT_ERR("%d", len);
+			l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
+			goto drop;
+		}
+
+		l2cap_data_channel_sframe(sk, control, skb);
+	}
+
+	return 0;
+
+drop:
+	kfree_skb(skb);
+	return 0;
+}
+
+static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb)
+{
+	struct sock *sk;
+	struct l2cap_pinfo *pi;
+	u16 control;
+	u8 tx_seq;
+	int len;
+
+	sk = l2cap_get_chan_by_scid(&conn->chan_list, cid);
+	if (!sk) {
+		BT_DBG("unknown cid 0x%4.4x", cid);
+		goto drop;
+	}
+
+	pi = l2cap_pi(sk);
+
+	BT_DBG("sk %p, len %d", sk, skb->len);
+
+	if (sk->sk_state != BT_CONNECTED)
+		goto drop;
+
+	switch (pi->mode) {
+	case L2CAP_MODE_BASIC:
+		/* If socket recv buffers overflows we drop data here
+		 * which is *bad* because L2CAP has to be reliable.
+		 * But we don't have any other choice. L2CAP doesn't
+		 * provide flow control mechanism. */
+
+		if (pi->imtu < skb->len)
+			goto drop;
+
+		if (!sock_queue_rcv_skb(sk, skb))
+			goto done;
+		break;
+
+	case L2CAP_MODE_ERTM:
+		if (!sock_owned_by_user(sk)) {
+			l2cap_ertm_data_rcv(sk, skb);
+		} else {
+			if (sk_add_backlog(sk, skb))
+				goto drop;
+		}
+
+		goto done;
+
+	case L2CAP_MODE_STREAMING:
+		control = get_unaligned_le16(skb->data);
+		skb_pull(skb, 2);
+		len = skb->len;
+
+		if (l2cap_check_fcs(pi, skb))
+			goto drop;
+
+		if (__is_sar_start(control))
+			len -= 2;
+
+		if (pi->fcs == L2CAP_FCS_CRC16)
+			len -= 2;
+
+		if (len > pi->mps || len < 0 || __is_sframe(control))
+			goto drop;
+
+		tx_seq = __get_txseq(control);
+
+		if (pi->expected_tx_seq == tx_seq)
+			pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
+		else
+			pi->expected_tx_seq = (tx_seq + 1) % 64;
+
+		l2cap_streaming_reassembly_sdu(sk, skb, control);
+
+		goto done;
+
+	default:
+		BT_DBG("sk %p: bad mode 0x%2.2x", sk, pi->mode);
+		break;
+	}
+
+drop:
+	kfree_skb(skb);
+
+done:
+	if (sk)
+		bh_unlock_sock(sk);
+
+	return 0;
+}
+
+static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb)
+{
+	struct sock *sk;
+
+	sk = l2cap_get_sock_by_psm(0, psm, conn->src);
+	if (!sk)
+		goto drop;
+
+	bh_lock_sock(sk);
+
+	BT_DBG("sk %p, len %d", sk, skb->len);
+
+	if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED)
+		goto drop;
+
+	if (l2cap_pi(sk)->imtu < skb->len)
+		goto drop;
+
+	if (!sock_queue_rcv_skb(sk, skb))
+		goto done;
+
+drop:
+	kfree_skb(skb);
+
+done:
+	if (sk)
+		bh_unlock_sock(sk);
+	return 0;
+}
+
+static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
+{
+	struct l2cap_hdr *lh = (void *) skb->data;
+	u16 cid, len;
+	__le16 psm;
+
+	skb_pull(skb, L2CAP_HDR_SIZE);
+	cid = __le16_to_cpu(lh->cid);
+	len = __le16_to_cpu(lh->len);
+
+	if (len != skb->len) {
+		kfree_skb(skb);
+		return;
+	}
+
+	BT_DBG("len %d, cid 0x%4.4x", len, cid);
+
+	switch (cid) {
+	case L2CAP_CID_SIGNALING:
+		l2cap_sig_channel(conn, skb);
+		break;
+
+	case L2CAP_CID_CONN_LESS:
+		psm = get_unaligned_le16(skb->data);
+		skb_pull(skb, 2);
+		l2cap_conless_channel(conn, psm, skb);
+		break;
+
+	default:
+		l2cap_data_channel(conn, cid, skb);
+		break;
+	}
+}
+
+/* ---- L2CAP interface with lower layer (HCI) ---- */
+
+static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type)
+{
+	int exact = 0, lm1 = 0, lm2 = 0;
+	register struct sock *sk;
+	struct hlist_node *node;
+
+	if (type != ACL_LINK)
+		return -EINVAL;
+
+	BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
+
+	/* Find listening sockets and check their link_mode */
+	read_lock(&l2cap_sk_list.lock);
+	sk_for_each(sk, node, &l2cap_sk_list.head) {
+		if (sk->sk_state != BT_LISTEN)
+			continue;
+
+		if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
+			lm1 |= HCI_LM_ACCEPT;
+			if (l2cap_pi(sk)->role_switch)
+				lm1 |= HCI_LM_MASTER;
+			exact++;
+		} else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
+			lm2 |= HCI_LM_ACCEPT;
+			if (l2cap_pi(sk)->role_switch)
+				lm2 |= HCI_LM_MASTER;
+		}
+	}
+	read_unlock(&l2cap_sk_list.lock);
+
+	return exact ? lm1 : lm2;
+}
+
+static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
+{
+	struct l2cap_conn *conn;
+
+	BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
+
+	if (hcon->type != ACL_LINK)
+		return -EINVAL;
+
+	if (!status) {
+		conn = l2cap_conn_add(hcon, status);
+		if (conn)
+			l2cap_conn_ready(conn);
+	} else
+		l2cap_conn_del(hcon, bt_err(status));
+
+	return 0;
+}
+
+static int l2cap_disconn_ind(struct hci_conn *hcon)
+{
+	struct l2cap_conn *conn = hcon->l2cap_data;
+
+	BT_DBG("hcon %p", hcon);
+
+	if (hcon->type != ACL_LINK || !conn)
+		return 0x13;
+
+	return conn->disc_reason;
+}
+
+static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
+{
+	BT_DBG("hcon %p reason %d", hcon, reason);
+
+	if (hcon->type != ACL_LINK)
+		return -EINVAL;
+
+	l2cap_conn_del(hcon, bt_err(reason));
+
+	return 0;
+}
+
+static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt)
+{
+	if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM)
+		return;
+
+	if (encrypt == 0x00) {
+		if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) {
+			l2cap_sock_clear_timer(sk);
+			l2cap_sock_set_timer(sk, HZ * 5);
+		} else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH)
+			__l2cap_sock_close(sk, ECONNREFUSED);
+	} else {
+		if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM)
+			l2cap_sock_clear_timer(sk);
+	}
+}
+
+static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
+{
+	struct l2cap_chan_list *l;
+	struct l2cap_conn *conn = hcon->l2cap_data;
+	struct sock *sk;
+
+	if (!conn)
+		return 0;
+
+	l = &conn->chan_list;
+
+	BT_DBG("conn %p", conn);
+
+	read_lock(&l->lock);
+
+	for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
+		bh_lock_sock(sk);
+
+		if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) {
+			bh_unlock_sock(sk);
+			continue;
+		}
+
+		if (!status && (sk->sk_state == BT_CONNECTED ||
+						sk->sk_state == BT_CONFIG)) {
+			l2cap_check_encryption(sk, encrypt);
+			bh_unlock_sock(sk);
+			continue;
+		}
+
+		if (sk->sk_state == BT_CONNECT) {
+			if (!status) {
+				struct l2cap_conn_req req;
+				req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
+				req.psm  = l2cap_pi(sk)->psm;
+
+				l2cap_pi(sk)->ident = l2cap_get_ident(conn);
+				l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
+
+				l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
+					L2CAP_CONN_REQ, sizeof(req), &req);
+			} else {
+				l2cap_sock_clear_timer(sk);
+				l2cap_sock_set_timer(sk, HZ / 10);
+			}
+		} else if (sk->sk_state == BT_CONNECT2) {
+			struct l2cap_conn_rsp rsp;
+			__u16 result;
+
+			if (!status) {
+				sk->sk_state = BT_CONFIG;
+				result = L2CAP_CR_SUCCESS;
+			} else {
+				sk->sk_state = BT_DISCONN;
+				l2cap_sock_set_timer(sk, HZ / 10);
+				result = L2CAP_CR_SEC_BLOCK;
+			}
+
+			rsp.scid   = cpu_to_le16(l2cap_pi(sk)->dcid);
+			rsp.dcid   = cpu_to_le16(l2cap_pi(sk)->scid);
+			rsp.result = cpu_to_le16(result);
+			rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
+			l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
+					L2CAP_CONN_RSP, sizeof(rsp), &rsp);
+		}
+
+		bh_unlock_sock(sk);
+	}
+
+	read_unlock(&l->lock);
+
+	return 0;
+}
+
+static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
+{
+	struct l2cap_conn *conn = hcon->l2cap_data;
+
+	if (!conn)
+		conn = l2cap_conn_add(hcon, 0);
+
+	if (!conn)
+		goto drop;
+
+	BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
+
+	if (!(flags & ACL_CONT)) {
+		struct l2cap_hdr *hdr;
+		struct sock *sk;
+		u16 cid;
+		int len;
+
+		if (conn->rx_len) {
+			BT_ERR("Unexpected start frame (len %d)", skb->len);
+			kfree_skb(conn->rx_skb);
+			conn->rx_skb = NULL;
+			conn->rx_len = 0;
+			l2cap_conn_unreliable(conn, ECOMM);
+		}
+
+		/* Start fragment always begin with Basic L2CAP header */
+		if (skb->len < L2CAP_HDR_SIZE) {
+			BT_ERR("Frame is too short (len %d)", skb->len);
+			l2cap_conn_unreliable(conn, ECOMM);
+			goto drop;
+		}
+
+		hdr = (struct l2cap_hdr *) skb->data;
+		len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
+		cid = __le16_to_cpu(hdr->cid);
+
+		if (len == skb->len) {
+			/* Complete frame received */
+			l2cap_recv_frame(conn, skb);
+			return 0;
+		}
+
+		BT_DBG("Start: total len %d, frag len %d", len, skb->len);
+
+		if (skb->len > len) {
+			BT_ERR("Frame is too long (len %d, expected len %d)",
+				skb->len, len);
+			l2cap_conn_unreliable(conn, ECOMM);
+			goto drop;
+		}
+
+		sk = l2cap_get_chan_by_scid(&conn->chan_list, cid);
+
+		if (sk && l2cap_pi(sk)->imtu < len - L2CAP_HDR_SIZE) {
+			BT_ERR("Frame exceeding recv MTU (len %d, MTU %d)",
+					len, l2cap_pi(sk)->imtu);
+			bh_unlock_sock(sk);
+			l2cap_conn_unreliable(conn, ECOMM);
+			goto drop;
+		}
+
+		if (sk)
+			bh_unlock_sock(sk);
+
+		/* Allocate skb for the complete frame (with header) */
+		conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC);
+		if (!conn->rx_skb)
+			goto drop;
+
+		skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
+								skb->len);
+		conn->rx_len = len - skb->len;
+	} else {
+		BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
+
+		if (!conn->rx_len) {
+			BT_ERR("Unexpected continuation frame (len %d)", skb->len);
+			l2cap_conn_unreliable(conn, ECOMM);
+			goto drop;
+		}
+
+		if (skb->len > conn->rx_len) {
+			BT_ERR("Fragment is too long (len %d, expected %d)",
+					skb->len, conn->rx_len);
+			kfree_skb(conn->rx_skb);
+			conn->rx_skb = NULL;
+			conn->rx_len = 0;
+			l2cap_conn_unreliable(conn, ECOMM);
+			goto drop;
+		}
+
+		skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
+								skb->len);
+		conn->rx_len -= skb->len;
+
+		if (!conn->rx_len) {
+			/* Complete frame received */
+			l2cap_recv_frame(conn, conn->rx_skb);
+			conn->rx_skb = NULL;
+		}
+	}
+
+drop:
+	kfree_skb(skb);
+	return 0;
+}
+
+static int l2cap_debugfs_show(struct seq_file *f, void *p)
+{
+	struct sock *sk;
+	struct hlist_node *node;
+
+	read_lock_bh(&l2cap_sk_list.lock);
+
+	sk_for_each(sk, node, &l2cap_sk_list.head) {
+		struct l2cap_pinfo *pi = l2cap_pi(sk);
+
+		seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d\n",
+					batostr(&bt_sk(sk)->src),
+					batostr(&bt_sk(sk)->dst),
+					sk->sk_state, __le16_to_cpu(pi->psm),
+					pi->scid, pi->dcid,
+					pi->imtu, pi->omtu, pi->sec_level);
+	}
+
+	read_unlock_bh(&l2cap_sk_list.lock);
+
+	return 0;
+}
+
+static int l2cap_debugfs_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, l2cap_debugfs_show, inode->i_private);
+}
+
+static const struct file_operations l2cap_debugfs_fops = {
+	.open		= l2cap_debugfs_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+static struct dentry *l2cap_debugfs;
+
+static const struct proto_ops l2cap_sock_ops = {
+	.family		= PF_BLUETOOTH,
+	.owner		= THIS_MODULE,
+	.release	= l2cap_sock_release,
+	.bind		= l2cap_sock_bind,
+	.connect	= l2cap_sock_connect,
+	.listen		= l2cap_sock_listen,
+	.accept		= l2cap_sock_accept,
+	.getname	= l2cap_sock_getname,
+	.sendmsg	= l2cap_sock_sendmsg,
+	.recvmsg	= l2cap_sock_recvmsg,
+	.poll		= bt_sock_poll,
+	.ioctl		= bt_sock_ioctl,
+	.mmap		= sock_no_mmap,
+	.socketpair	= sock_no_socketpair,
+	.shutdown	= l2cap_sock_shutdown,
+	.setsockopt	= l2cap_sock_setsockopt,
+	.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,
+	.connect_ind	= l2cap_connect_ind,
+	.connect_cfm	= l2cap_connect_cfm,
+	.disconn_ind	= l2cap_disconn_ind,
+	.disconn_cfm	= l2cap_disconn_cfm,
+	.security_cfm	= l2cap_security_cfm,
+	.recv_acldata	= l2cap_recv_acldata
+};
+
+static int __init l2cap_init(void)
+{
+	int err;
+
+	err = proto_register(&l2cap_proto, 0);
+	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");
+		goto error;
+	}
+
+	err = hci_register_proto(&l2cap_hci_proto);
+	if (err < 0) {
+		BT_ERR("L2CAP protocol registration failed");
+		bt_sock_unregister(BTPROTO_L2CAP);
+		goto error;
+	}
+
+	if (bt_debugfs) {
+		l2cap_debugfs = debugfs_create_file("l2cap", 0444,
+					bt_debugfs, NULL, &l2cap_debugfs_fops);
+		if (!l2cap_debugfs)
+			BT_ERR("Failed to create L2CAP debug file");
+	}
+
+	BT_INFO("L2CAP ver %s", VERSION);
+	BT_INFO("L2CAP socket layer initialized");
+
+	return 0;
+
+error:
+	destroy_workqueue(_busy_wq);
+	proto_unregister(&l2cap_proto);
+	return err;
+}
+
+static void __exit l2cap_exit(void)
+{
+	debugfs_remove(l2cap_debugfs);
+
+	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);
+}
+
+void l2cap_load(void)
+{
+	/* Dummy function to trigger automatic L2CAP module loading by
+	 * other modules that use L2CAP sockets but don't use any other
+	 * symbols from it. */
+}
+EXPORT_SYMBOL(l2cap_load);
+
+module_init(l2cap_init);
+module_exit(l2cap_exit);
+
+module_param(disable_ertm, bool, 0644);
+MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
+
+MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
+MODULE_DESCRIPTION("Bluetooth L2CAP ver " VERSION);
+MODULE_VERSION(VERSION);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("bt-proto-0");