hci_core.c 55.1 KB
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/*
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   BlueZ - Bluetooth protocol stack for Linux
   Copyright (C) 2000-2001 Qualcomm Incorporated
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   Copyright (C) 2011 ProFUSION Embedded Systems
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   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
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   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
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   OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

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   ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
   COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
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   SOFTWARE IS DISCLAIMED.
*/

/* Bluetooth HCI core. */

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#include <linux/jiffies.h>
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#include <linux/module.h>
#include <linux/kmod.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/skbuff.h>
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#include <linux/workqueue.h>
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#include <linux/interrupt.h>
#include <linux/notifier.h>
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#include <linux/rfkill.h>
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#include <linux/timer.h>
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#include <linux/crypto.h>
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#include <net/sock.h>

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

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

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#define AUTO_OFF_TIMEOUT 2000

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int enable_hs;

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static void hci_rx_work(struct work_struct *work);
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static void hci_cmd_work(struct work_struct *work);
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static void hci_tx_work(struct work_struct *work);
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static DEFINE_MUTEX(hci_task_lock);
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/* HCI device list */
LIST_HEAD(hci_dev_list);
DEFINE_RWLOCK(hci_dev_list_lock);

/* HCI callback list */
LIST_HEAD(hci_cb_list);
DEFINE_RWLOCK(hci_cb_list_lock);

/* HCI protocols */
#define HCI_MAX_PROTO	2
struct hci_proto *hci_proto[HCI_MAX_PROTO];

/* HCI notifiers list */
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static ATOMIC_NOTIFIER_HEAD(hci_notifier);
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/* ---- HCI notifications ---- */

int hci_register_notifier(struct notifier_block *nb)
{
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	return atomic_notifier_chain_register(&hci_notifier, nb);
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}

int hci_unregister_notifier(struct notifier_block *nb)
{
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	return atomic_notifier_chain_unregister(&hci_notifier, nb);
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}

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static void hci_notify(struct hci_dev *hdev, int event)
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{
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	atomic_notifier_call_chain(&hci_notifier, event, hdev);
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}

/* ---- HCI requests ---- */

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void hci_req_complete(struct hci_dev *hdev, __u16 cmd, int result)
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{
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	BT_DBG("%s command 0x%04x result 0x%2.2x", hdev->name, cmd, result);

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	/* If this is the init phase check if the completed command matches
	 * the last init command, and if not just return.
	 */
	if (test_bit(HCI_INIT, &hdev->flags) && hdev->init_last_cmd != cmd)
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		return;
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	if (hdev->req_status == HCI_REQ_PEND) {
		hdev->req_result = result;
		hdev->req_status = HCI_REQ_DONE;
		wake_up_interruptible(&hdev->req_wait_q);
	}
}

static void hci_req_cancel(struct hci_dev *hdev, int err)
{
	BT_DBG("%s err 0x%2.2x", hdev->name, err);

	if (hdev->req_status == HCI_REQ_PEND) {
		hdev->req_result = err;
		hdev->req_status = HCI_REQ_CANCELED;
		wake_up_interruptible(&hdev->req_wait_q);
	}
}

/* Execute request and wait for completion. */
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static int __hci_request(struct hci_dev *hdev, void (*req)(struct hci_dev *hdev, unsigned long opt),
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					unsigned long opt, __u32 timeout)
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{
	DECLARE_WAITQUEUE(wait, current);
	int err = 0;

	BT_DBG("%s start", hdev->name);

	hdev->req_status = HCI_REQ_PEND;

	add_wait_queue(&hdev->req_wait_q, &wait);
	set_current_state(TASK_INTERRUPTIBLE);

	req(hdev, opt);
	schedule_timeout(timeout);

	remove_wait_queue(&hdev->req_wait_q, &wait);

	if (signal_pending(current))
		return -EINTR;

	switch (hdev->req_status) {
	case HCI_REQ_DONE:
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		err = -bt_to_errno(hdev->req_result);
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		break;

	case HCI_REQ_CANCELED:
		err = -hdev->req_result;
		break;

	default:
		err = -ETIMEDOUT;
		break;
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	}
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	hdev->req_status = hdev->req_result = 0;
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	BT_DBG("%s end: err %d", hdev->name, err);

	return err;
}

static inline int hci_request(struct hci_dev *hdev, void (*req)(struct hci_dev *hdev, unsigned long opt),
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					unsigned long opt, __u32 timeout)
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{
	int ret;

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	if (!test_bit(HCI_UP, &hdev->flags))
		return -ENETDOWN;

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	/* Serialize all requests */
	hci_req_lock(hdev);
	ret = __hci_request(hdev, req, opt, timeout);
	hci_req_unlock(hdev);

	return ret;
}

static void hci_reset_req(struct hci_dev *hdev, unsigned long opt)
{
	BT_DBG("%s %ld", hdev->name, opt);

	/* Reset device */
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	set_bit(HCI_RESET, &hdev->flags);
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	hci_send_cmd(hdev, HCI_OP_RESET, 0, NULL);
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}

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static void bredr_init(struct hci_dev *hdev)
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{
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	struct hci_cp_delete_stored_link_key cp;
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	__le16 param;
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	__u8 flt_type;
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	/* Mandatory initialization */

	/* Reset */
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	if (!test_bit(HCI_QUIRK_NO_RESET, &hdev->quirks)) {
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		set_bit(HCI_RESET, &hdev->flags);
		hci_send_cmd(hdev, HCI_OP_RESET, 0, NULL);
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	}
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	/* Read Local Supported Features */
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	hci_send_cmd(hdev, HCI_OP_READ_LOCAL_FEATURES, 0, NULL);
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	/* Read Local Version */
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	hci_send_cmd(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL);
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	/* Read Buffer Size (ACL mtu, max pkt, etc.) */
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	hci_send_cmd(hdev, HCI_OP_READ_BUFFER_SIZE, 0, NULL);
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	/* Read BD Address */
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	hci_send_cmd(hdev, HCI_OP_READ_BD_ADDR, 0, NULL);

	/* Read Class of Device */
	hci_send_cmd(hdev, HCI_OP_READ_CLASS_OF_DEV, 0, NULL);

	/* Read Local Name */
	hci_send_cmd(hdev, HCI_OP_READ_LOCAL_NAME, 0, NULL);
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	/* Read Voice Setting */
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	hci_send_cmd(hdev, HCI_OP_READ_VOICE_SETTING, 0, NULL);
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	/* Optional initialization */

	/* Clear Event Filters */
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	flt_type = HCI_FLT_CLEAR_ALL;
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	hci_send_cmd(hdev, HCI_OP_SET_EVENT_FLT, 1, &flt_type);
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	/* Connection accept timeout ~20 secs */
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	param = cpu_to_le16(0x7d00);
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	hci_send_cmd(hdev, HCI_OP_WRITE_CA_TIMEOUT, 2, &param);
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	bacpy(&cp.bdaddr, BDADDR_ANY);
	cp.delete_all = 1;
	hci_send_cmd(hdev, HCI_OP_DELETE_STORED_LINK_KEY, sizeof(cp), &cp);
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}

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static void amp_init(struct hci_dev *hdev)
{
	/* Reset */
	hci_send_cmd(hdev, HCI_OP_RESET, 0, NULL);

	/* Read Local Version */
	hci_send_cmd(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL);
}

static void hci_init_req(struct hci_dev *hdev, unsigned long opt)
{
	struct sk_buff *skb;

	BT_DBG("%s %ld", hdev->name, opt);

	/* Driver initialization */

	/* Special commands */
	while ((skb = skb_dequeue(&hdev->driver_init))) {
		bt_cb(skb)->pkt_type = HCI_COMMAND_PKT;
		skb->dev = (void *) hdev;

		skb_queue_tail(&hdev->cmd_q, skb);
		queue_work(hdev->workqueue, &hdev->cmd_work);
	}
	skb_queue_purge(&hdev->driver_init);

	switch (hdev->dev_type) {
	case HCI_BREDR:
		bredr_init(hdev);
		break;

	case HCI_AMP:
		amp_init(hdev);
		break;

	default:
		BT_ERR("Unknown device type %d", hdev->dev_type);
		break;
	}

}

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static void hci_le_init_req(struct hci_dev *hdev, unsigned long opt)
{
	BT_DBG("%s", hdev->name);

	/* Read LE buffer size */
	hci_send_cmd(hdev, HCI_OP_LE_READ_BUFFER_SIZE, 0, NULL);
}

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static void hci_scan_req(struct hci_dev *hdev, unsigned long opt)
{
	__u8 scan = opt;

	BT_DBG("%s %x", hdev->name, scan);

	/* Inquiry and Page scans */
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	hci_send_cmd(hdev, HCI_OP_WRITE_SCAN_ENABLE, 1, &scan);
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}

static void hci_auth_req(struct hci_dev *hdev, unsigned long opt)
{
	__u8 auth = opt;

	BT_DBG("%s %x", hdev->name, auth);

	/* Authentication */
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	hci_send_cmd(hdev, HCI_OP_WRITE_AUTH_ENABLE, 1, &auth);
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}

static void hci_encrypt_req(struct hci_dev *hdev, unsigned long opt)
{
	__u8 encrypt = opt;

	BT_DBG("%s %x", hdev->name, encrypt);

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	/* Encryption */
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	hci_send_cmd(hdev, HCI_OP_WRITE_ENCRYPT_MODE, 1, &encrypt);
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}

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static void hci_linkpol_req(struct hci_dev *hdev, unsigned long opt)
{
	__le16 policy = cpu_to_le16(opt);

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	BT_DBG("%s %x", hdev->name, policy);
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	/* Default link policy */
	hci_send_cmd(hdev, HCI_OP_WRITE_DEF_LINK_POLICY, 2, &policy);
}

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/* Get HCI device by index.
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 * Device is held on return. */
struct hci_dev *hci_dev_get(int index)
{
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	struct hci_dev *hdev = NULL, *d;
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	BT_DBG("%d", index);

	if (index < 0)
		return NULL;

	read_lock(&hci_dev_list_lock);
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	list_for_each_entry(d, &hci_dev_list, list) {
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		if (d->id == index) {
			hdev = hci_dev_hold(d);
			break;
		}
	}
	read_unlock(&hci_dev_list_lock);
	return hdev;
}

/* ---- Inquiry support ---- */
static void inquiry_cache_flush(struct hci_dev *hdev)
{
	struct inquiry_cache *cache = &hdev->inq_cache;
	struct inquiry_entry *next  = cache->list, *e;

	BT_DBG("cache %p", cache);

	cache->list = NULL;
	while ((e = next)) {
		next = e->next;
		kfree(e);
	}
}

struct inquiry_entry *hci_inquiry_cache_lookup(struct hci_dev *hdev, bdaddr_t *bdaddr)
{
	struct inquiry_cache *cache = &hdev->inq_cache;
	struct inquiry_entry *e;

	BT_DBG("cache %p, %s", cache, batostr(bdaddr));

	for (e = cache->list; e; e = e->next)
		if (!bacmp(&e->data.bdaddr, bdaddr))
			break;
	return e;
}

void hci_inquiry_cache_update(struct hci_dev *hdev, struct inquiry_data *data)
{
	struct inquiry_cache *cache = &hdev->inq_cache;
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	struct inquiry_entry *ie;
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	BT_DBG("cache %p, %s", cache, batostr(&data->bdaddr));

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	ie = hci_inquiry_cache_lookup(hdev, &data->bdaddr);
	if (!ie) {
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		/* Entry not in the cache. Add new one. */
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		ie = kzalloc(sizeof(struct inquiry_entry), GFP_ATOMIC);
		if (!ie)
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			return;
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		ie->next = cache->list;
		cache->list = ie;
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	}

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	memcpy(&ie->data, data, sizeof(*data));
	ie->timestamp = jiffies;
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	cache->timestamp = jiffies;
}

static int inquiry_cache_dump(struct hci_dev *hdev, int num, __u8 *buf)
{
	struct inquiry_cache *cache = &hdev->inq_cache;
	struct inquiry_info *info = (struct inquiry_info *) buf;
	struct inquiry_entry *e;
	int copied = 0;

	for (e = cache->list; e && copied < num; e = e->next, copied++) {
		struct inquiry_data *data = &e->data;
		bacpy(&info->bdaddr, &data->bdaddr);
		info->pscan_rep_mode	= data->pscan_rep_mode;
		info->pscan_period_mode	= data->pscan_period_mode;
		info->pscan_mode	= data->pscan_mode;
		memcpy(info->dev_class, data->dev_class, 3);
		info->clock_offset	= data->clock_offset;
		info++;
	}

	BT_DBG("cache %p, copied %d", cache, copied);
	return copied;
}

static void hci_inq_req(struct hci_dev *hdev, unsigned long opt)
{
	struct hci_inquiry_req *ir = (struct hci_inquiry_req *) opt;
	struct hci_cp_inquiry cp;

	BT_DBG("%s", hdev->name);

	if (test_bit(HCI_INQUIRY, &hdev->flags))
		return;

	/* Start Inquiry */
	memcpy(&cp.lap, &ir->lap, 3);
	cp.length  = ir->length;
	cp.num_rsp = ir->num_rsp;
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	hci_send_cmd(hdev, HCI_OP_INQUIRY, sizeof(cp), &cp);
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}

int hci_inquiry(void __user *arg)
{
	__u8 __user *ptr = arg;
	struct hci_inquiry_req ir;
	struct hci_dev *hdev;
	int err = 0, do_inquiry = 0, max_rsp;
	long timeo;
	__u8 *buf;

	if (copy_from_user(&ir, ptr, sizeof(ir)))
		return -EFAULT;

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	hdev = hci_dev_get(ir.dev_id);
	if (!hdev)
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		return -ENODEV;

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	hci_dev_lock(hdev);
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	if (inquiry_cache_age(hdev) > INQUIRY_CACHE_AGE_MAX ||
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				inquiry_cache_empty(hdev) ||
				ir.flags & IREQ_CACHE_FLUSH) {
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		inquiry_cache_flush(hdev);
		do_inquiry = 1;
	}
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	hci_dev_unlock(hdev);
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	timeo = ir.length * msecs_to_jiffies(2000);
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	if (do_inquiry) {
		err = hci_request(hdev, hci_inq_req, (unsigned long)&ir, timeo);
		if (err < 0)
			goto done;
	}
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	/* for unlimited number of responses we will use buffer with 255 entries */
	max_rsp = (ir.num_rsp == 0) ? 255 : ir.num_rsp;

	/* cache_dump can't sleep. Therefore we allocate temp buffer and then
	 * copy it to the user space.
	 */
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	buf = kmalloc(sizeof(struct inquiry_info) * max_rsp, GFP_KERNEL);
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	if (!buf) {
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		err = -ENOMEM;
		goto done;
	}

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	hci_dev_lock(hdev);
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	ir.num_rsp = inquiry_cache_dump(hdev, max_rsp, buf);
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	hci_dev_unlock(hdev);
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	BT_DBG("num_rsp %d", ir.num_rsp);

	if (!copy_to_user(ptr, &ir, sizeof(ir))) {
		ptr += sizeof(ir);
		if (copy_to_user(ptr, buf, sizeof(struct inquiry_info) *
					ir.num_rsp))
			err = -EFAULT;
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	} else
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		err = -EFAULT;

	kfree(buf);

done:
	hci_dev_put(hdev);
	return err;
}

/* ---- HCI ioctl helpers ---- */

int hci_dev_open(__u16 dev)
{
	struct hci_dev *hdev;
	int ret = 0;

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	hdev = hci_dev_get(dev);
	if (!hdev)
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		return -ENODEV;

	BT_DBG("%s %p", hdev->name, hdev);

	hci_req_lock(hdev);

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	if (hdev->rfkill && rfkill_blocked(hdev->rfkill)) {
		ret = -ERFKILL;
		goto done;
	}

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	if (test_bit(HCI_UP, &hdev->flags)) {
		ret = -EALREADY;
		goto done;
	}

	if (test_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks))
		set_bit(HCI_RAW, &hdev->flags);

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	/* Treat all non BR/EDR controllers as raw devices if
	   enable_hs is not set */
	if (hdev->dev_type != HCI_BREDR && !enable_hs)
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		set_bit(HCI_RAW, &hdev->flags);

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	if (hdev->open(hdev)) {
		ret = -EIO;
		goto done;
	}

	if (!test_bit(HCI_RAW, &hdev->flags)) {
		atomic_set(&hdev->cmd_cnt, 1);
		set_bit(HCI_INIT, &hdev->flags);
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		hdev->init_last_cmd = 0;
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		ret = __hci_request(hdev, hci_init_req, 0,
					msecs_to_jiffies(HCI_INIT_TIMEOUT));
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		if (lmp_host_le_capable(hdev))
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			ret = __hci_request(hdev, hci_le_init_req, 0,
					msecs_to_jiffies(HCI_INIT_TIMEOUT));

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		clear_bit(HCI_INIT, &hdev->flags);
	}

	if (!ret) {
		hci_dev_hold(hdev);
		set_bit(HCI_UP, &hdev->flags);
		hci_notify(hdev, HCI_DEV_UP);
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		if (!test_bit(HCI_SETUP, &hdev->flags)) {
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			hci_dev_lock(hdev);
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			mgmt_powered(hdev, 1);
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			hci_dev_unlock(hdev);
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		}
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	} else {
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		/* Init failed, cleanup */
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		flush_work(&hdev->tx_work);
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		flush_work(&hdev->cmd_work);
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		flush_work(&hdev->rx_work);
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		skb_queue_purge(&hdev->cmd_q);
		skb_queue_purge(&hdev->rx_q);

		if (hdev->flush)
			hdev->flush(hdev);

		if (hdev->sent_cmd) {
			kfree_skb(hdev->sent_cmd);
			hdev->sent_cmd = NULL;
		}

		hdev->close(hdev);
		hdev->flags = 0;
	}

done:
	hci_req_unlock(hdev);
	hci_dev_put(hdev);
	return ret;
}

static int hci_dev_do_close(struct hci_dev *hdev)
{
	BT_DBG("%s %p", hdev->name, hdev);

	hci_req_cancel(hdev, ENODEV);
	hci_req_lock(hdev);

	if (!test_and_clear_bit(HCI_UP, &hdev->flags)) {
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		del_timer_sync(&hdev->cmd_timer);
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		hci_req_unlock(hdev);
		return 0;
	}

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	/* Flush RX and TX works */
	flush_work(&hdev->tx_work);
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	flush_work(&hdev->rx_work);
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	if (hdev->discov_timeout > 0) {
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		cancel_delayed_work(&hdev->discov_off);
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		hdev->discov_timeout = 0;
	}

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	if (test_and_clear_bit(HCI_AUTO_OFF, &hdev->flags))
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		cancel_delayed_work(&hdev->power_off);
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	if (test_and_clear_bit(HCI_SERVICE_CACHE, &hdev->flags))
		cancel_delayed_work(&hdev->service_cache);

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	hci_dev_lock(hdev);
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	inquiry_cache_flush(hdev);
	hci_conn_hash_flush(hdev);
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	hci_dev_unlock(hdev);
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	hci_notify(hdev, HCI_DEV_DOWN);

	if (hdev->flush)
		hdev->flush(hdev);

	/* Reset device */
	skb_queue_purge(&hdev->cmd_q);
	atomic_set(&hdev->cmd_cnt, 1);
	if (!test_bit(HCI_RAW, &hdev->flags)) {
		set_bit(HCI_INIT, &hdev->flags);
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		__hci_request(hdev, hci_reset_req, 0,
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					msecs_to_jiffies(HCI_INIT_TIMEOUT));
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		clear_bit(HCI_INIT, &hdev->flags);
	}

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	/* flush cmd  work */
	flush_work(&hdev->cmd_work);
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	/* Drop queues */
	skb_queue_purge(&hdev->rx_q);
	skb_queue_purge(&hdev->cmd_q);
	skb_queue_purge(&hdev->raw_q);

	/* Drop last sent command */
	if (hdev->sent_cmd) {
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		del_timer_sync(&hdev->cmd_timer);
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		kfree_skb(hdev->sent_cmd);
		hdev->sent_cmd = NULL;
	}

	/* After this point our queues are empty
	 * and no tasks are scheduled. */
	hdev->close(hdev);

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	hci_dev_lock(hdev);
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	mgmt_powered(hdev, 0);
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	hci_dev_unlock(hdev);
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	/* Clear flags */
	hdev->flags = 0;

	hci_req_unlock(hdev);

	hci_dev_put(hdev);
	return 0;
}

int hci_dev_close(__u16 dev)
{
	struct hci_dev *hdev;
	int err;

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	hdev = hci_dev_get(dev);
	if (!hdev)
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		return -ENODEV;
	err = hci_dev_do_close(hdev);
	hci_dev_put(hdev);
	return err;
}

int hci_dev_reset(__u16 dev)
{
	struct hci_dev *hdev;
	int ret = 0;

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	hdev = hci_dev_get(dev);
	if (!hdev)
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		return -ENODEV;

	hci_req_lock(hdev);

	if (!test_bit(HCI_UP, &hdev->flags))
		goto done;

	/* Drop queues */
	skb_queue_purge(&hdev->rx_q);
	skb_queue_purge(&hdev->cmd_q);

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	hci_dev_lock(hdev);
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	inquiry_cache_flush(hdev);
	hci_conn_hash_flush(hdev);
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	hci_dev_unlock(hdev);
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	if (hdev->flush)
		hdev->flush(hdev);

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	atomic_set(&hdev->cmd_cnt, 1);
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	hdev->acl_cnt = 0; hdev->sco_cnt = 0; hdev->le_cnt = 0;
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	if (!test_bit(HCI_RAW, &hdev->flags))
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		ret = __hci_request(hdev, hci_reset_req, 0,
					msecs_to_jiffies(HCI_INIT_TIMEOUT));
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done:
	hci_req_unlock(hdev);
	hci_dev_put(hdev);
	return ret;
}

int hci_dev_reset_stat(__u16 dev)
{
	struct hci_dev *hdev;
	int ret = 0;

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	hdev = hci_dev_get(dev);
	if (!hdev)
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		return -ENODEV;

	memset(&hdev->stat, 0, sizeof(struct hci_dev_stats));

	hci_dev_put(hdev);

	return ret;
}

int hci_dev_cmd(unsigned int cmd, void __user *arg)
{
	struct hci_dev *hdev;
	struct hci_dev_req dr;
	int err = 0;

	if (copy_from_user(&dr, arg, sizeof(dr)))
		return -EFAULT;

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	hdev = hci_dev_get(dr.dev_id);
	if (!hdev)
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		return -ENODEV;

	switch (cmd) {
	case HCISETAUTH:
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		err = hci_request(hdev, hci_auth_req, dr.dev_opt,
					msecs_to_jiffies(HCI_INIT_TIMEOUT));
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		break;

	case HCISETENCRYPT:
		if (!lmp_encrypt_capable(hdev)) {
			err = -EOPNOTSUPP;
			break;
		}

		if (!test_bit(HCI_AUTH, &hdev->flags)) {
			/* Auth must be enabled first */
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			err = hci_request(hdev, hci_auth_req, dr.dev_opt,
					msecs_to_jiffies(HCI_INIT_TIMEOUT));
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			if (err)
				break;
		}

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		err = hci_request(hdev, hci_encrypt_req, dr.dev_opt,
					msecs_to_jiffies(HCI_INIT_TIMEOUT));
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		break;

	case HCISETSCAN:
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		err = hci_request(hdev, hci_scan_req, dr.dev_opt,
					msecs_to_jiffies(HCI_INIT_TIMEOUT));
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		break;

	case HCISETLINKPOL:
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		err = hci_request(hdev, hci_linkpol_req, dr.dev_opt,
					msecs_to_jiffies(HCI_INIT_TIMEOUT));
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		break;

	case HCISETLINKMODE:
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		hdev->link_mode = ((__u16) dr.dev_opt) &
					(HCI_LM_MASTER | HCI_LM_ACCEPT);
		break;

	case HCISETPTYPE:
		hdev->pkt_type = (__u16) dr.dev_opt;
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		break;

	case HCISETACLMTU:
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		hdev->acl_mtu  = *((__u16 *) &dr.dev_opt + 1);
		hdev->acl_pkts = *((__u16 *) &dr.dev_opt + 0);
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		break;

	case HCISETSCOMTU:
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		hdev->sco_mtu  = *((__u16 *) &dr.dev_opt + 1);
		hdev->sco_pkts = *((__u16 *) &dr.dev_opt + 0);
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		break;

	default:
		err = -EINVAL;
		break;
	}
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	hci_dev_put(hdev);
	return err;
}

int hci_get_dev_list(void __user *arg)
{
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	struct hci_dev *hdev;
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	struct hci_dev_list_req *dl;
	struct hci_dev_req *dr;
	int n = 0, size, err;
	__u16 dev_num;

	if (get_user(dev_num, (__u16 __user *) arg))
		return -EFAULT;

	if (!dev_num || dev_num > (PAGE_SIZE * 2) / sizeof(*dr))
		return -EINVAL;

	size = sizeof(*dl) + dev_num * sizeof(*dr);

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	dl = kzalloc(size, GFP_KERNEL);
	if (!dl)
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		return -ENOMEM;

	dr = dl->dev_req;

	read_lock_bh(&hci_dev_list_lock);
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	list_for_each_entry(hdev, &hci_dev_list, list) {
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		if (test_and_clear_bit(HCI_AUTO_OFF, &hdev->flags))
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			cancel_delayed_work(&hdev->power_off);
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		if (!test_bit(HCI_MGMT, &hdev->flags))
			set_bit(HCI_PAIRABLE, &hdev->flags);

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		(dr + n)->dev_id  = hdev->id;
		(dr + n)->dev_opt = hdev->flags;
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		if (++n >= dev_num)
			break;
	}
	read_unlock_bh(&hci_dev_list_lock);

	dl->dev_num = n;
	size = sizeof(*dl) + n * sizeof(*dr);

	err = copy_to_user(arg, dl, size);
	kfree(dl);

	return err ? -EFAULT : 0;
}

int hci_get_dev_info(void __user *arg)
{
	struct hci_dev *hdev;
	struct hci_dev_info di;
	int err = 0;

	if (copy_from_user(&di, arg, sizeof(di)))
		return -EFAULT;

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	hdev = hci_dev_get(di.dev_id);
	if (!hdev)
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		return -ENODEV;

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	if (test_and_clear_bit(HCI_AUTO_OFF, &hdev->flags))
		cancel_delayed_work_sync(&hdev->power_off);
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	if (!test_bit(HCI_MGMT, &hdev->flags))
		set_bit(HCI_PAIRABLE, &hdev->flags);

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	strcpy(di.name, hdev->name);
	di.bdaddr   = hdev->bdaddr;
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	di.type     = (hdev->bus & 0x0f) | (hdev->dev_type << 4);
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	di.flags    = hdev->flags;
	di.pkt_type = hdev->pkt_type;
	di.acl_mtu  = hdev->acl_mtu;
	di.acl_pkts = hdev->acl_pkts;
	di.sco_mtu  = hdev->sco_mtu;
	di.sco_pkts = hdev->sco_pkts;
	di.link_policy = hdev->link_policy;
	di.link_mode   = hdev->link_mode;

	memcpy(&di.stat, &hdev->stat, sizeof(di.stat));
	memcpy(&di.features, &hdev->features, sizeof(di.features));

	if (copy_to_user(arg, &di, sizeof(di)))
		err = -EFAULT;

	hci_dev_put(hdev);

	return err;
}

/* ---- Interface to HCI drivers ---- */

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static int hci_rfkill_set_block(void *data, bool blocked)
{
	struct hci_dev *hdev = data;

	BT_DBG("%p name %s blocked %d", hdev, hdev->name, blocked);

	if (!blocked)
		return 0;

	hci_dev_do_close(hdev);

	return 0;
}

static const struct rfkill_ops hci_rfkill_ops = {
	.set_block = hci_rfkill_set_block,
};

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/* Alloc HCI device */
struct hci_dev *hci_alloc_dev(void)
{
	struct hci_dev *hdev;

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	hdev = kzalloc(sizeof(struct hci_dev), GFP_KERNEL);
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	if (!hdev)
		return NULL;

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	hci_init_sysfs(hdev);
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	skb_queue_head_init(&hdev->driver_init);

	return hdev;
}
EXPORT_SYMBOL(hci_alloc_dev);

/* Free HCI device */
void hci_free_dev(struct hci_dev *hdev)
{
	skb_queue_purge(&hdev->driver_init);

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	/* will free via device release */
	put_device(&hdev->dev);
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}
EXPORT_SYMBOL(hci_free_dev);

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static void hci_power_on(struct work_struct *work)
{
	struct hci_dev *hdev = container_of(work, struct hci_dev, power_on);

	BT_DBG("%s", hdev->name);

	if (hci_dev_open(hdev->id) < 0)
		return;

	if (test_bit(HCI_AUTO_OFF, &hdev->flags))
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		schedule_delayed_work(&hdev->power_off,
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					msecs_to_jiffies(AUTO_OFF_TIMEOUT));
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	if (test_and_clear_bit(HCI_SETUP, &hdev->flags))
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		mgmt_index_added(hdev);
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}

static void hci_power_off(struct work_struct *work)
{
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	struct hci_dev *hdev = container_of(work, struct hci_dev,
							power_off.work);
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	BT_DBG("%s", hdev->name);

	clear_bit(HCI_AUTO_OFF, &hdev->flags);

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	hci_dev_close(hdev->id);
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}

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static void hci_discov_off(struct work_struct *work)
{
	struct hci_dev *hdev;
	u8 scan = SCAN_PAGE;

	hdev = container_of(work, struct hci_dev, discov_off.work);

	BT_DBG("%s", hdev->name);

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	hci_dev_lock(hdev);
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	hci_send_cmd(hdev, HCI_OP_WRITE_SCAN_ENABLE, sizeof(scan), &scan);

	hdev->discov_timeout = 0;

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	hci_dev_unlock(hdev);
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}

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int hci_uuids_clear(struct hci_dev *hdev)
{
	struct list_head *p, *n;

	list_for_each_safe(p, n, &hdev->uuids) {
		struct bt_uuid *uuid;

		uuid = list_entry(p, struct bt_uuid, list);

		list_del(p);
		kfree(uuid);
	}

	return 0;
}

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int hci_link_keys_clear(struct hci_dev *hdev)
{
	struct list_head *p, *n;

	list_for_each_safe(p, n, &hdev->link_keys) {
		struct link_key *key;

		key = list_entry(p, struct link_key, list);

		list_del(p);
		kfree(key);
	}

	return 0;
}

struct link_key *hci_find_link_key(struct hci_dev *hdev, bdaddr_t *bdaddr)
{
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	struct link_key *k;
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	list_for_each_entry(k, &hdev->link_keys, list)
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		if (bacmp(bdaddr, &k->bdaddr) == 0)
			return k;

	return NULL;
}

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static int hci_persistent_key(struct hci_dev *hdev, struct hci_conn *conn,
						u8 key_type, u8 old_key_type)
{
	/* Legacy key */
	if (key_type < 0x03)
		return 1;

	/* Debug keys are insecure so don't store them persistently */
	if (key_type == HCI_LK_DEBUG_COMBINATION)
		return 0;

	/* Changed combination key and there's no previous one */
	if (key_type == HCI_LK_CHANGED_COMBINATION && old_key_type == 0xff)
		return 0;

	/* Security mode 3 case */
	if (!conn)
		return 1;

	/* Neither local nor remote side had no-bonding as requirement */
	if (conn->auth_type > 0x01 && conn->remote_auth > 0x01)
		return 1;

	/* Local side had dedicated bonding as requirement */
	if (conn->auth_type == 0x02 || conn->auth_type == 0x03)
		return 1;

	/* Remote side had dedicated bonding as requirement */
	if (conn->remote_auth == 0x02 || conn->remote_auth == 0x03)
		return 1;

	/* If none of the above criteria match, then don't store the key
	 * persistently */
	return 0;
}

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struct link_key *hci_find_ltk(struct hci_dev *hdev, __le16 ediv, u8 rand[8])
{
	struct link_key *k;

	list_for_each_entry(k, &hdev->link_keys, list) {
		struct key_master_id *id;

		if (k->type != HCI_LK_SMP_LTK)
			continue;

		if (k->dlen != sizeof(*id))
			continue;

		id = (void *) &k->data;
		if (id->ediv == ediv &&
				(memcmp(rand, id->rand, sizeof(id->rand)) == 0))
			return k;
	}

	return NULL;
}
EXPORT_SYMBOL(hci_find_ltk);

struct link_key *hci_find_link_key_type(struct hci_dev *hdev,
					bdaddr_t *bdaddr, u8 type)
{
	struct link_key *k;

	list_for_each_entry(k, &hdev->link_keys, list)
		if (k->type == type && bacmp(bdaddr, &k->bdaddr) == 0)
			return k;

	return NULL;
}
EXPORT_SYMBOL(hci_find_link_key_type);

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int hci_add_link_key(struct hci_dev *hdev, struct hci_conn *conn, int new_key,
				bdaddr_t *bdaddr, u8 *val, u8 type, u8 pin_len)
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{
	struct link_key *key, *old_key;
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	u8 old_key_type, persistent;
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	old_key = hci_find_link_key(hdev, bdaddr);
	if (old_key) {
		old_key_type = old_key->type;
		key = old_key;
	} else {
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		old_key_type = conn ? conn->key_type : 0xff;
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		key = kzalloc(sizeof(*key), GFP_ATOMIC);
		if (!key)
			return -ENOMEM;
		list_add(&key->list, &hdev->link_keys);
	}

	BT_DBG("%s key for %s type %u", hdev->name, batostr(bdaddr), type);

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	/* Some buggy controller combinations generate a changed
	 * combination key for legacy pairing even when there's no
	 * previous key */
	if (type == HCI_LK_CHANGED_COMBINATION &&
					(!conn || conn->remote_auth == 0xff) &&
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					old_key_type == 0xff) {
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		type = HCI_LK_COMBINATION;
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		if (conn)
			conn->key_type = type;
	}
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	bacpy(&key->bdaddr, bdaddr);
	memcpy(key->val, val, 16);
	key->pin_len = pin_len;

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	if (type == HCI_LK_CHANGED_COMBINATION)
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		key->type = old_key_type;
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	else
		key->type = type;

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	if (!new_key)
		return 0;

	persistent = hci_persistent_key(hdev, conn, type, old_key_type);

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	mgmt_new_link_key(hdev, key, persistent);
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	if (!persistent) {
		list_del(&key->list);
		kfree(key);
	}
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	return 0;
}

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int hci_add_ltk(struct hci_dev *hdev, int new_key, bdaddr_t *bdaddr,
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			u8 key_size, __le16 ediv, u8 rand[8], u8 ltk[16])
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{
	struct link_key *key, *old_key;
	struct key_master_id *id;
	u8 old_key_type;

	BT_DBG("%s addr %s", hdev->name, batostr(bdaddr));

	old_key = hci_find_link_key_type(hdev, bdaddr, HCI_LK_SMP_LTK);
	if (old_key) {
		key = old_key;
		old_key_type = old_key->type;
	} else {
		key = kzalloc(sizeof(*key) + sizeof(*id), GFP_ATOMIC);
		if (!key)
			return -ENOMEM;
		list_add(&key->list, &hdev->link_keys);
		old_key_type = 0xff;
	}

	key->dlen = sizeof(*id);

	bacpy(&key->bdaddr, bdaddr);
	memcpy(key->val, ltk, sizeof(key->val));
	key->type = HCI_LK_SMP_LTK;
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	key->pin_len = key_size;
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	id = (void *) &key->data;
	id->ediv = ediv;
	memcpy(id->rand, rand, sizeof(id->rand));

	if (new_key)
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		mgmt_new_link_key(hdev, key, old_key_type);
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	return 0;
}

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int hci_remove_link_key(struct hci_dev *hdev, bdaddr_t *bdaddr)
{
	struct link_key *key;

	key = hci_find_link_key(hdev, bdaddr);
	if (!key)
		return -ENOENT;

	BT_DBG("%s removing %s", hdev->name, batostr(bdaddr));

	list_del(&key->list);
	kfree(key);

	return 0;
}

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/* HCI command timer function */
static void hci_cmd_timer(unsigned long arg)
{
	struct hci_dev *hdev = (void *) arg;

	BT_ERR("%s command tx timeout", hdev->name);
	atomic_set(&hdev->cmd_cnt, 1);
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	queue_work(hdev->workqueue, &hdev->cmd_work);
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}

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struct oob_data *hci_find_remote_oob_data(struct hci_dev *hdev,
							bdaddr_t *bdaddr)
{
	struct oob_data *data;

	list_for_each_entry(data, &hdev->remote_oob_data, list)
		if (bacmp(bdaddr, &data->bdaddr) == 0)
			return data;

	return NULL;
}

int hci_remove_remote_oob_data(struct hci_dev *hdev, bdaddr_t *bdaddr)
{
	struct oob_data *data;

	data = hci_find_remote_oob_data(hdev, bdaddr);
	if (!data)
		return -ENOENT;

	BT_DBG("%s removing %s", hdev->name, batostr(bdaddr));

	list_del(&data->list);
	kfree(data);

	return 0;
}

int hci_remote_oob_data_clear(struct hci_dev *hdev)
{
	struct oob_data *data, *n;

	list_for_each_entry_safe(data, n, &hdev->remote_oob_data, list) {
		list_del(&data->list);
		kfree(data);
	}

	return 0;
}

int hci_add_remote_oob_data(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 *hash,
								u8 *randomizer)
{
	struct oob_data *data;

	data = hci_find_remote_oob_data(hdev, bdaddr);

	if (!data) {
		data = kmalloc(sizeof(*data), GFP_ATOMIC);
		if (!data)
			return -ENOMEM;

		bacpy(&data->bdaddr, bdaddr);
		list_add(&data->list, &hdev->remote_oob_data);
	}

	memcpy(data->hash, hash, sizeof(data->hash));
	memcpy(data->randomizer, randomizer, sizeof(data->randomizer));

	BT_DBG("%s for %s", hdev->name, batostr(bdaddr));

	return 0;
}

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struct bdaddr_list *hci_blacklist_lookup(struct hci_dev *hdev,
						bdaddr_t *bdaddr)
{
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	struct bdaddr_list *b;
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	list_for_each_entry(b, &hdev->blacklist, list)
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		if (bacmp(bdaddr, &b->bdaddr) == 0)
			return b;

	return NULL;
}

int hci_blacklist_clear(struct hci_dev *hdev)
{
	struct list_head *p, *n;

	list_for_each_safe(p, n, &hdev->blacklist) {
		struct bdaddr_list *b;

		b = list_entry(p, struct bdaddr_list, list);

		list_del(p);
		kfree(b);
	}

	return 0;
}

int hci_blacklist_add(struct hci_dev *hdev, bdaddr_t *bdaddr)
{
	struct bdaddr_list *entry;

	if (bacmp(bdaddr, BDADDR_ANY) == 0)
		return -EBADF;

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	if (hci_blacklist_lookup(hdev, bdaddr))
		return -EEXIST;
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	entry = kzalloc(sizeof(struct bdaddr_list), GFP_KERNEL);
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	if (!entry)
		return -ENOMEM;
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	bacpy(&entry->bdaddr, bdaddr);

	list_add(&entry->list, &hdev->blacklist);

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