path: root/net/bluetooth/sco.c

/*
   BlueZ - Bluetooth protocol stack for Linux
   Copyright (C) 2000-2001 Qualcomm Incorporated

   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 SCO sockets. */

#include <linux/module.h>

#include <linux/types.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/device.h>
#include <linux/list.h>
#include <net/sock.h>

#include <asm/system.h>
#include <asm/uaccess.h>

#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#include <net/bluetooth/sco.h>

#define VERSION "0.6"

static int disable_esco = 0;

static const struct proto_ops sco_sock_ops;

static struct bt_sock_list sco_sk_list = {
	.lock = __RW_LOCK_UNLOCKED(sco_sk_list.lock)
};

static void __sco_chan_add(struct sco_conn *conn, struct sock *sk, struct sock *parent);
static void sco_chan_del(struct sock *sk, int err);

static int  sco_conn_del(struct hci_conn *conn, int err);

static void sco_sock_close(struct sock *sk);
static void sco_sock_kill(struct sock *sk);

/* ---- SCO timers ---- */
static void sco_sock_timeout(unsigned long arg)
{
	struct sock *sk = (struct sock *) arg;

	BT_DBG("sock %p state %d", sk, sk->sk_state);

	bh_lock_sock(sk);
	sk->sk_err = ETIMEDOUT;
	sk->sk_state_change(sk);
	bh_unlock_sock(sk);

	sco_sock_kill(sk);
	sock_put(sk);
}

static void sco_sock_set_timer(struct sock *sk, long timeout)
{
	BT_DBG("sock %p state %d timeout %ld", sk, sk->sk_state, timeout);
	sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout);
}

static void sco_sock_clear_timer(struct sock *sk)
{
	BT_DBG("sock %p state %d", sk, sk->sk_state);
	sk_stop_timer(sk, &sk->sk_timer);
}

/* ---- SCO connections ---- */
static struct sco_conn *sco_conn_add(struct hci_conn *hcon, __u8 status)
{
	struct hci_dev *hdev = hcon->hdev;
	struct sco_conn *conn = hcon->sco_data;

	if (conn || status)
		return conn;

	conn = kzalloc(sizeof(struct sco_conn), GFP_ATOMIC);
	if (!conn)
		return NULL;

	spin_lock_init(&conn->lock);

	hcon->sco_data = conn;
	conn->hcon = hcon;

	conn->src = &hdev->bdaddr;
	conn->dst = &hcon->dst;

	if (hdev->sco_mtu > 0)
		conn->mtu = hdev->sco_mtu;
	else
		conn->mtu = 60;

	BT_DBG("hcon %p conn %p", hcon, conn);

	return conn;
}

static inline struct sock *sco_chan_get(struct sco_conn *conn)
{
	struct sock *sk = NULL;
	sco_conn_lock(conn);
	sk = conn->sk;
	sco_conn_unlock(conn);
	return sk;
}

static int sco_conn_del(struct hci_conn *hcon, int err)
{
	struct sco_conn *conn;
	struct sock *sk;

	if (!(conn = hcon->sco_data))
		return 0;

	BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);

	/* Kill socket */
	if ((