hci_sock.c 24.8 KB
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/*
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   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
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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 sockets. */

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#include <linux/export.h>
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#include <asm/unaligned.h>

#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
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#include <net/bluetooth/hci_mon.h>
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static atomic_t monitor_promisc = ATOMIC_INIT(0);

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/* ----- HCI socket interface ----- */

static inline int hci_test_bit(int nr, void *addr)
{
	return *((__u32 *) addr + (nr >> 5)) & ((__u32) 1 << (nr & 31));
}

/* Security filter */
static struct hci_sec_filter hci_sec_filter = {
	/* Packet types */
	0x10,
	/* Events */
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	{ 0x1000d9fe, 0x0000b00c },
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	/* Commands */
	{
		{ 0x0 },
		/* OGF_LINK_CTL */
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		{ 0xbe000006, 0x00000001, 0x00000000, 0x00 },
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		/* OGF_LINK_POLICY */
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		{ 0x00005200, 0x00000000, 0x00000000, 0x00 },
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		/* OGF_HOST_CTL */
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		{ 0xaab00200, 0x2b402aaa, 0x05220154, 0x00 },
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		/* OGF_INFO_PARAM */
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		{ 0x000002be, 0x00000000, 0x00000000, 0x00 },
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		/* OGF_STATUS_PARAM */
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		{ 0x000000ea, 0x00000000, 0x00000000, 0x00 }
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	}
};

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

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static bool is_filtered_packet(struct sock *sk, struct sk_buff *skb)
{
	struct hci_filter *flt;
	int flt_type, flt_event;

	/* Apply filter */
	flt = &hci_pi(sk)->filter;

	if (bt_cb(skb)->pkt_type == HCI_VENDOR_PKT)
		flt_type = 0;
	else
		flt_type = bt_cb(skb)->pkt_type & HCI_FLT_TYPE_BITS;

	if (!test_bit(flt_type, &flt->type_mask))
		return true;

	/* Extra filter for event packets only */
	if (bt_cb(skb)->pkt_type != HCI_EVENT_PKT)
		return false;

	flt_event = (*(__u8 *)skb->data & HCI_FLT_EVENT_BITS);

	if (!hci_test_bit(flt_event, &flt->event_mask))
		return true;

	/* Check filter only when opcode is set */
	if (!flt->opcode)
		return false;

	if (flt_event == HCI_EV_CMD_COMPLETE &&
	    flt->opcode != get_unaligned((__le16 *)(skb->data + 3)))
		return true;

	if (flt_event == HCI_EV_CMD_STATUS &&
	    flt->opcode != get_unaligned((__le16 *)(skb->data + 4)))
		return true;

	return false;
}

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/* Send frame to RAW socket */
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void hci_send_to_sock(struct hci_dev *hdev, struct sk_buff *skb)
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{
	struct sock *sk;
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	struct sk_buff *skb_copy = NULL;
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	BT_DBG("hdev %p len %d", hdev, skb->len);

	read_lock(&hci_sk_list.lock);
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	sk_for_each(sk, &hci_sk_list.head) {
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		struct sk_buff *nskb;

		if (sk->sk_state != BT_BOUND || hci_pi(sk)->hdev != hdev)
			continue;

		/* Don't send frame to the socket it came from */
		if (skb->sk == sk)
			continue;

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		if (hci_pi(sk)->channel == HCI_CHANNEL_RAW) {
			if (is_filtered_packet(sk, skb))
				continue;
		} else if (hci_pi(sk)->channel == HCI_CHANNEL_USER) {
			if (!bt_cb(skb)->incoming)
				continue;
			if (bt_cb(skb)->pkt_type != HCI_EVENT_PKT &&
			    bt_cb(skb)->pkt_type != HCI_ACLDATA_PKT &&
			    bt_cb(skb)->pkt_type != HCI_SCODATA_PKT)
				continue;
		} else {
			/* Don't send frame to other channel types */
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			continue;
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		}
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		if (!skb_copy) {
			/* Create a private copy with headroom */
			skb_copy = __pskb_copy(skb, 1, GFP_ATOMIC);
			if (!skb_copy)
				continue;

			/* Put type byte before the data */
			memcpy(skb_push(skb_copy, 1), &bt_cb(skb)->pkt_type, 1);
		}

		nskb = skb_clone(skb_copy, GFP_ATOMIC);
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		if (!nskb)
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			continue;

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		if (sock_queue_rcv_skb(sk, nskb))
			kfree_skb(nskb);
	}

	read_unlock(&hci_sk_list.lock);
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	kfree_skb(skb_copy);
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}

/* Send frame to control socket */
void hci_send_to_control(struct sk_buff *skb, struct sock *skip_sk)
{
	struct sock *sk;

	BT_DBG("len %d", skb->len);

	read_lock(&hci_sk_list.lock);

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	sk_for_each(sk, &hci_sk_list.head) {
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		struct sk_buff *nskb;

		/* Skip the original socket */
		if (sk == skip_sk)
			continue;

		if (sk->sk_state != BT_BOUND)
			continue;

		if (hci_pi(sk)->channel != HCI_CHANNEL_CONTROL)
			continue;

		nskb = skb_clone(skb, GFP_ATOMIC);
		if (!nskb)
			continue;
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		if (sock_queue_rcv_skb(sk, nskb))
			kfree_skb(nskb);
	}
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	read_unlock(&hci_sk_list.lock);
}

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/* Send frame to monitor socket */
void hci_send_to_monitor(struct hci_dev *hdev, struct sk_buff *skb)
{
	struct sock *sk;
	struct sk_buff *skb_copy = NULL;
	__le16 opcode;

	if (!atomic_read(&monitor_promisc))
		return;

	BT_DBG("hdev %p len %d", hdev, skb->len);

	switch (bt_cb(skb)->pkt_type) {
	case HCI_COMMAND_PKT:
		opcode = __constant_cpu_to_le16(HCI_MON_COMMAND_PKT);
		break;
	case HCI_EVENT_PKT:
		opcode = __constant_cpu_to_le16(HCI_MON_EVENT_PKT);
		break;
	case HCI_ACLDATA_PKT:
		if (bt_cb(skb)->incoming)
			opcode = __constant_cpu_to_le16(HCI_MON_ACL_RX_PKT);
		else
			opcode = __constant_cpu_to_le16(HCI_MON_ACL_TX_PKT);
		break;
	case HCI_SCODATA_PKT:
		if (bt_cb(skb)->incoming)
			opcode = __constant_cpu_to_le16(HCI_MON_SCO_RX_PKT);
		else
			opcode = __constant_cpu_to_le16(HCI_MON_SCO_TX_PKT);
		break;
	default:
		return;
	}

	read_lock(&hci_sk_list.lock);

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	sk_for_each(sk, &hci_sk_list.head) {
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		struct sk_buff *nskb;

		if (sk->sk_state != BT_BOUND)
			continue;

		if (hci_pi(sk)->channel != HCI_CHANNEL_MONITOR)
			continue;

		if (!skb_copy) {
			struct hci_mon_hdr *hdr;

			/* Create a private copy with headroom */
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			skb_copy = __pskb_copy(skb, HCI_MON_HDR_SIZE,
					       GFP_ATOMIC);
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			if (!skb_copy)
				continue;

			/* Put header before the data */
			hdr = (void *) skb_push(skb_copy, HCI_MON_HDR_SIZE);
			hdr->opcode = opcode;
			hdr->index = cpu_to_le16(hdev->id);
			hdr->len = cpu_to_le16(skb->len);
		}

		nskb = skb_clone(skb_copy, GFP_ATOMIC);
		if (!nskb)
			continue;

		if (sock_queue_rcv_skb(sk, nskb))
			kfree_skb(nskb);
	}

	read_unlock(&hci_sk_list.lock);

	kfree_skb(skb_copy);
}

static void send_monitor_event(struct sk_buff *skb)
{
	struct sock *sk;

	BT_DBG("len %d", skb->len);

	read_lock(&hci_sk_list.lock);

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	sk_for_each(sk, &hci_sk_list.head) {
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		struct sk_buff *nskb;

		if (sk->sk_state != BT_BOUND)
			continue;

		if (hci_pi(sk)->channel != HCI_CHANNEL_MONITOR)
			continue;

		nskb = skb_clone(skb, GFP_ATOMIC);
		if (!nskb)
			continue;

		if (sock_queue_rcv_skb(sk, nskb))
			kfree_skb(nskb);
	}

	read_unlock(&hci_sk_list.lock);
}

static struct sk_buff *create_monitor_event(struct hci_dev *hdev, int event)
{
	struct hci_mon_hdr *hdr;
	struct hci_mon_new_index *ni;
	struct sk_buff *skb;
	__le16 opcode;

	switch (event) {
	case HCI_DEV_REG:
		skb = bt_skb_alloc(HCI_MON_NEW_INDEX_SIZE, GFP_ATOMIC);
		if (!skb)
			return NULL;

		ni = (void *) skb_put(skb, HCI_MON_NEW_INDEX_SIZE);
		ni->type = hdev->dev_type;
		ni->bus = hdev->bus;
		bacpy(&ni->bdaddr, &hdev->bdaddr);
		memcpy(ni->name, hdev->name, 8);

		opcode = __constant_cpu_to_le16(HCI_MON_NEW_INDEX);
		break;

	case HCI_DEV_UNREG:
		skb = bt_skb_alloc(0, GFP_ATOMIC);
		if (!skb)
			return NULL;

		opcode = __constant_cpu_to_le16(HCI_MON_DEL_INDEX);
		break;

	default:
		return NULL;
	}

	__net_timestamp(skb);

	hdr = (void *) skb_push(skb, HCI_MON_HDR_SIZE);
	hdr->opcode = opcode;
	hdr->index = cpu_to_le16(hdev->id);
	hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);

	return skb;
}

static void send_monitor_replay(struct sock *sk)
{
	struct hci_dev *hdev;

	read_lock(&hci_dev_list_lock);

	list_for_each_entry(hdev, &hci_dev_list, list) {
		struct sk_buff *skb;

		skb = create_monitor_event(hdev, HCI_DEV_REG);
		if (!skb)
			continue;

		if (sock_queue_rcv_skb(sk, skb))
			kfree_skb(skb);
	}

	read_unlock(&hci_dev_list_lock);
}

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/* Generate internal stack event */
static void hci_si_event(struct hci_dev *hdev, int type, int dlen, void *data)
{
	struct hci_event_hdr *hdr;
	struct hci_ev_stack_internal *ev;
	struct sk_buff *skb;

	skb = bt_skb_alloc(HCI_EVENT_HDR_SIZE + sizeof(*ev) + dlen, GFP_ATOMIC);
	if (!skb)
		return;

	hdr = (void *) skb_put(skb, HCI_EVENT_HDR_SIZE);
	hdr->evt  = HCI_EV_STACK_INTERNAL;
	hdr->plen = sizeof(*ev) + dlen;

	ev  = (void *) skb_put(skb, sizeof(*ev) + dlen);
	ev->type = type;
	memcpy(ev->data, data, dlen);

	bt_cb(skb)->incoming = 1;
	__net_timestamp(skb);

	bt_cb(skb)->pkt_type = HCI_EVENT_PKT;
	skb->dev = (void *) hdev;
	hci_send_to_sock(hdev, skb);
	kfree_skb(skb);
}

void hci_sock_dev_event(struct hci_dev *hdev, int event)
{
	struct hci_ev_si_device ev;

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

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	/* Send event to monitor */
	if (atomic_read(&monitor_promisc)) {
		struct sk_buff *skb;

		skb = create_monitor_event(hdev, event);
		if (skb) {
			send_monitor_event(skb);
			kfree_skb(skb);
		}
	}

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	/* Send event to sockets */
	ev.event  = event;
	ev.dev_id = hdev->id;
	hci_si_event(NULL, HCI_EV_SI_DEVICE, sizeof(ev), &ev);

	if (event == HCI_DEV_UNREG) {
		struct sock *sk;

		/* Detach sockets from device */
		read_lock(&hci_sk_list.lock);
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		sk_for_each(sk, &hci_sk_list.head) {
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			bh_lock_sock_nested(sk);
			if (hci_pi(sk)->hdev == hdev) {
				hci_pi(sk)->hdev = NULL;
				sk->sk_err = EPIPE;
				sk->sk_state = BT_OPEN;
				sk->sk_state_change(sk);

				hci_dev_put(hdev);
			}
			bh_unlock_sock(sk);
		}
		read_unlock(&hci_sk_list.lock);
	}
}

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static int hci_sock_release(struct socket *sock)
{
	struct sock *sk = sock->sk;
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	struct hci_dev *hdev;
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	BT_DBG("sock %p sk %p", sock, sk);

	if (!sk)
		return 0;

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	hdev = hci_pi(sk)->hdev;

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	if (hci_pi(sk)->channel == HCI_CHANNEL_MONITOR)
		atomic_dec(&monitor_promisc);

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	bt_sock_unlink(&hci_sk_list, sk);

	if (hdev) {
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		if (hci_pi(sk)->channel == HCI_CHANNEL_USER) {
			mgmt_index_added(hdev);
			clear_bit(HCI_USER_CHANNEL, &hdev->dev_flags);
			hci_dev_close(hdev->id);
		}

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		atomic_dec(&hdev->promisc);
		hci_dev_put(hdev);
	}

	sock_orphan(sk);

	skb_queue_purge(&sk->sk_receive_queue);
	skb_queue_purge(&sk->sk_write_queue);

	sock_put(sk);
	return 0;
}

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static int hci_sock_blacklist_add(struct hci_dev *hdev, void __user *arg)
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{
	bdaddr_t bdaddr;
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	int err;
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	if (copy_from_user(&bdaddr, arg, sizeof(bdaddr)))
		return -EFAULT;

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	hci_dev_lock(hdev);
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	err = hci_blacklist_add(hdev, &bdaddr, 0);
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	hci_dev_unlock(hdev);
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	return err;
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}

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static int hci_sock_blacklist_del(struct hci_dev *hdev, void __user *arg)
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{
	bdaddr_t bdaddr;
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	int err;
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	if (copy_from_user(&bdaddr, arg, sizeof(bdaddr)))
		return -EFAULT;

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	hci_dev_lock(hdev);
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	err = hci_blacklist_del(hdev, &bdaddr, 0);
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	hci_dev_unlock(hdev);
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	return err;
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}

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/* Ioctls that require bound socket */
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static int hci_sock_bound_ioctl(struct sock *sk, unsigned int cmd,
				unsigned long arg)
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{
	struct hci_dev *hdev = hci_pi(sk)->hdev;

	if (!hdev)
		return -EBADFD;

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	if (test_bit(HCI_USER_CHANNEL, &hdev->dev_flags))
		return -EBUSY;

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	if (hdev->dev_type != HCI_BREDR)
		return -EOPNOTSUPP;

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	switch (cmd) {
	case HCISETRAW:
		if (!capable(CAP_NET_ADMIN))
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			return -EPERM;
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		if (test_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks))
			return -EPERM;

		if (arg)
			set_bit(HCI_RAW, &hdev->flags);
		else
			clear_bit(HCI_RAW, &hdev->flags);

		return 0;

	case HCIGETCONNINFO:
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		return hci_get_conn_info(hdev, (void __user *) arg);

	case HCIGETAUTHINFO:
		return hci_get_auth_info(hdev, (void __user *) arg);
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	case HCIBLOCKADDR:
		if (!capable(CAP_NET_ADMIN))
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			return -EPERM;
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		return hci_sock_blacklist_add(hdev, (void __user *) arg);
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	case HCIUNBLOCKADDR:
		if (!capable(CAP_NET_ADMIN))
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			return -EPERM;
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		return hci_sock_blacklist_del(hdev, (void __user *) arg);
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	}
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	if (hdev->ioctl)
		return hdev->ioctl(hdev, cmd, arg);

	return -EINVAL;
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}

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static int hci_sock_ioctl(struct socket *sock, unsigned int cmd,
			  unsigned long arg)
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{
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	void __user *argp = (void __user *) arg;
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	struct sock *sk = sock->sk;
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	int err;

	BT_DBG("cmd %x arg %lx", cmd, arg);

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	lock_sock(sk);

	if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
		err = -EBADFD;
		goto done;
	}

	release_sock(sk);

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	switch (cmd) {
	case HCIGETDEVLIST:
		return hci_get_dev_list(argp);

	case HCIGETDEVINFO:
		return hci_get_dev_info(argp);

	case HCIGETCONNLIST:
		return hci_get_conn_list(argp);

	case HCIDEVUP:
		if (!capable(CAP_NET_ADMIN))
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			return -EPERM;
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		return hci_dev_open(arg);

	case HCIDEVDOWN:
		if (!capable(CAP_NET_ADMIN))
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			return -EPERM;
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		return hci_dev_close(arg);

	case HCIDEVRESET:
		if (!capable(CAP_NET_ADMIN))
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			return -EPERM;
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		return hci_dev_reset(arg);

	case HCIDEVRESTAT:
		if (!capable(CAP_NET_ADMIN))
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			return -EPERM;
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		return hci_dev_reset_stat(arg);

	case HCISETSCAN:
	case HCISETAUTH:
	case HCISETENCRYPT:
	case HCISETPTYPE:
	case HCISETLINKPOL:
	case HCISETLINKMODE:
	case HCISETACLMTU:
	case HCISETSCOMTU:
		if (!capable(CAP_NET_ADMIN))
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			return -EPERM;
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		return hci_dev_cmd(cmd, argp);

	case HCIINQUIRY:
		return hci_inquiry(argp);
	}
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	lock_sock(sk);

	err = hci_sock_bound_ioctl(sk, cmd, arg);

done:
	release_sock(sk);
	return err;
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}

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static int hci_sock_bind(struct socket *sock, struct sockaddr *addr,
			 int addr_len)
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{
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	struct sockaddr_hci haddr;
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	struct sock *sk = sock->sk;
	struct hci_dev *hdev = NULL;
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	int len, err = 0;
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	BT_DBG("sock %p sk %p", sock, sk);

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	if (!addr)
		return -EINVAL;

	memset(&haddr, 0, sizeof(haddr));
	len = min_t(unsigned int, sizeof(haddr), addr_len);
	memcpy(&haddr, addr, len);

	if (haddr.hci_family != AF_BLUETOOTH)
		return -EINVAL;

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	lock_sock(sk);

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	if (sk->sk_state == BT_BOUND) {
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		err = -EALREADY;
		goto done;
	}

662 663 664 665
	switch (haddr.hci_channel) {
	case HCI_CHANNEL_RAW:
		if (hci_pi(sk)->hdev) {
			err = -EALREADY;
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			goto done;
		}

669 670 671 672 673 674 675 676 677 678 679 680 681
		if (haddr.hci_dev != HCI_DEV_NONE) {
			hdev = hci_dev_get(haddr.hci_dev);
			if (!hdev) {
				err = -ENODEV;
				goto done;
			}

			atomic_inc(&hdev->promisc);
		}

		hci_pi(sk)->hdev = hdev;
		break;

682 683 684 685 686 687 688 689 690 691 692
	case HCI_CHANNEL_USER:
		if (hci_pi(sk)->hdev) {
			err = -EALREADY;
			goto done;
		}

		if (haddr.hci_dev == HCI_DEV_NONE) {
			err = -EINVAL;
			goto done;
		}

693
		if (!capable(CAP_NET_ADMIN)) {
694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731
			err = -EPERM;
			goto done;
		}

		hdev = hci_dev_get(haddr.hci_dev);
		if (!hdev) {
			err = -ENODEV;
			goto done;
		}

		if (test_bit(HCI_UP, &hdev->flags) ||
		    test_bit(HCI_INIT, &hdev->flags) ||
		    test_bit(HCI_SETUP, &hdev->dev_flags)) {
			err = -EBUSY;
			hci_dev_put(hdev);
			goto done;
		}

		if (test_and_set_bit(HCI_USER_CHANNEL, &hdev->dev_flags)) {
			err = -EUSERS;
			hci_dev_put(hdev);
			goto done;
		}

		mgmt_index_removed(hdev);

		err = hci_dev_open(hdev->id);
		if (err) {
			clear_bit(HCI_USER_CHANNEL, &hdev->dev_flags);
			hci_dev_put(hdev);
			goto done;
		}

		atomic_inc(&hdev->promisc);

		hci_pi(sk)->hdev = hdev;
		break;

732
	case HCI_CHANNEL_CONTROL:
733
		if (haddr.hci_dev != HCI_DEV_NONE) {
734 735 736 737
			err = -EINVAL;
			goto done;
		}

738 739 740 741 742
		if (!capable(CAP_NET_ADMIN)) {
			err = -EPERM;
			goto done;
		}

743 744
		break;

745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760
	case HCI_CHANNEL_MONITOR:
		if (haddr.hci_dev != HCI_DEV_NONE) {
			err = -EINVAL;
			goto done;
		}

		if (!capable(CAP_NET_RAW)) {
			err = -EPERM;
			goto done;
		}

		send_monitor_replay(sk);

		atomic_inc(&monitor_promisc);
		break;

761 762 763
	default:
		err = -EINVAL;
		goto done;
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	}

766

767
	hci_pi(sk)->channel = haddr.hci_channel;
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	sk->sk_state = BT_BOUND;

done:
	release_sock(sk);
	return err;
}

775 776
static int hci_sock_getname(struct socket *sock, struct sockaddr *addr,
			    int *addr_len, int peer)
L
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{
	struct sockaddr_hci *haddr = (struct sockaddr_hci *) addr;
	struct sock *sk = sock->sk;
780 781
	struct hci_dev *hdev;
	int err = 0;
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	BT_DBG("sock %p sk %p", sock, sk);

785 786 787
	if (peer)
		return -EOPNOTSUPP;

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	lock_sock(sk);

790 791 792 793 794 795
	hdev = hci_pi(sk)->hdev;
	if (!hdev) {
		err = -EBADFD;
		goto done;
	}

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	*addr_len = sizeof(*haddr);
	haddr->hci_family = AF_BLUETOOTH;
798
	haddr->hci_dev    = hdev->id;
799
	haddr->hci_channel= hci_pi(sk)->channel;
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800

801
done:
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802
	release_sock(sk);
803
	return err;
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}

806 807
static void hci_sock_cmsg(struct sock *sk, struct msghdr *msg,
			  struct sk_buff *skb)
L
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{
	__u32 mask = hci_pi(sk)->cmsg_mask;

811 812
	if (mask & HCI_CMSG_DIR) {
		int incoming = bt_cb(skb)->incoming;
813 814
		put_cmsg(msg, SOL_HCI, HCI_CMSG_DIR, sizeof(incoming),
			 &incoming);
815
	}
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816

817
	if (mask & HCI_CMSG_TSTAMP) {
818 819 820
#ifdef CONFIG_COMPAT
		struct compat_timeval ctv;
#endif
821
		struct timeval tv;
822 823
		void *data;
		int len;
824 825

		skb_get_timestamp(skb, &tv);
826

827 828 829
		data = &tv;
		len = sizeof(tv);
#ifdef CONFIG_COMPAT
830 831
		if (!COMPAT_USE_64BIT_TIME &&
		    (msg->msg_flags & MSG_CMSG_COMPAT)) {
832 833 834 835 836
			ctv.tv_sec = tv.tv_sec;
			ctv.tv_usec = tv.tv_usec;
			data = &ctv;
			len = sizeof(ctv);
		}
837
#endif
838 839

		put_cmsg(msg, SOL_HCI, HCI_CMSG_TSTAMP, len, data);
840
	}
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}
842 843

static int hci_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
844
			    struct msghdr *msg, size_t len, int flags)
L
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845 846 847 848 849 850 851 852 853 854 855 856 857 858
{
	int noblock = flags & MSG_DONTWAIT;
	struct sock *sk = sock->sk;
	struct sk_buff *skb;
	int copied, err;

	BT_DBG("sock %p, sk %p", sock, sk);

	if (flags & (MSG_OOB))
		return -EOPNOTSUPP;

	if (sk->sk_state == BT_CLOSED)
		return 0;

A
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	skb = skb_recv_datagram(sk, flags, noblock, &err);
	if (!skb)
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		return err;

	msg->msg_namelen = 0;

	copied = skb->len;
	if (len < copied) {
		msg->msg_flags |= MSG_TRUNC;
		copied = len;
	}

871
	skb_reset_transport_header(skb);
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	err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);

874 875 876 877
	switch (hci_pi(sk)->channel) {
	case HCI_CHANNEL_RAW:
		hci_sock_cmsg(sk, msg, skb);
		break;
878
	case HCI_CHANNEL_USER:
879
	case HCI_CHANNEL_CONTROL:
880 881 882
	case HCI_CHANNEL_MONITOR:
		sock_recv_timestamp(msg, sk, skb);
		break;
883
	}
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884 885 886 887 888 889

	skb_free_datagram(sk, skb);

	return err ? : copied;
}

890
static int hci_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
L
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891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910
			    struct msghdr *msg, size_t len)
{
	struct sock *sk = sock->sk;
	struct hci_dev *hdev;
	struct sk_buff *skb;
	int err;

	BT_DBG("sock %p sk %p", sock, sk);

	if (msg->msg_flags & MSG_OOB)
		return -EOPNOTSUPP;

	if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_NOSIGNAL|MSG_ERRQUEUE))
		return -EINVAL;

	if (len < 4 || len > HCI_MAX_FRAME_SIZE)
		return -EINVAL;

	lock_sock(sk);

911 912
	switch (hci_pi(sk)->channel) {
	case HCI_CHANNEL_RAW:
913
	case HCI_CHANNEL_USER:
914 915 916 917
		break;
	case HCI_CHANNEL_CONTROL:
		err = mgmt_control(sk, msg, len);
		goto done;
918 919 920
	case HCI_CHANNEL_MONITOR:
		err = -EOPNOTSUPP;
		goto done;
921 922 923 924 925
	default:
		err = -EINVAL;
		goto done;
	}

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Andrei Emeltchenko 已提交
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	hdev = hci_pi(sk)->hdev;
	if (!hdev) {
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		err = -EBADFD;
		goto done;
	}

932 933 934 935 936
	if (!test_bit(HCI_UP, &hdev->flags)) {
		err = -ENETDOWN;
		goto done;
	}

A
Andrei Emeltchenko 已提交
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	skb = bt_skb_send_alloc(sk, len, msg->msg_flags & MSG_DONTWAIT, &err);
	if (!skb)
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		goto done;

	if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
		err = -EFAULT;
		goto drop;
	}

946
	bt_cb(skb)->pkt_type = *((unsigned char *) skb->data);
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	skb_pull(skb, 1);
	skb->dev = (void *) hdev;

950 951
	if (hci_pi(sk)->channel == HCI_CHANNEL_RAW &&
	    bt_cb(skb)->pkt_type == HCI_COMMAND_PKT) {
952
		u16 opcode = get_unaligned_le16(skb->data);
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		u16 ogf = hci_opcode_ogf(opcode);
		u16 ocf = hci_opcode_ocf(opcode);

		if (((ogf > HCI_SFLT_MAX_OGF) ||
957 958 959
		     !hci_test_bit(ocf & HCI_FLT_OCF_BITS,
				   &hci_sec_filter.ocf_mask[ogf])) &&
		    !capable(CAP_NET_RAW)) {
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			err = -EPERM;
			goto drop;
		}

964
		if (test_bit(HCI_RAW, &hdev->flags) || (ogf == 0x3f)) {
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			skb_queue_tail(&hdev->raw_q, skb);
966
			queue_work(hdev->workqueue, &hdev->tx_work);
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		} else {
968 969 970 971 972
			/* Stand-alone HCI commands must be flaged as
			 * single-command requests.
			 */
			bt_cb(skb)->req.start = true;

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			skb_queue_tail(&hdev->cmd_q, skb);
974
			queue_work(hdev->workqueue, &hdev->cmd_work);
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		}
	} else {
		if (!capable(CAP_NET_RAW)) {
			err = -EPERM;
			goto drop;
		}

982 983 984 985 986 987 988 989
		if (hci_pi(sk)->channel == HCI_CHANNEL_USER &&
		    bt_cb(skb)->pkt_type != HCI_COMMAND_PKT &&
		    bt_cb(skb)->pkt_type != HCI_ACLDATA_PKT &&
		    bt_cb(skb)->pkt_type != HCI_SCODATA_PKT) {
			err = -EINVAL;
			goto drop;
		}

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		skb_queue_tail(&hdev->raw_q, skb);
991
		queue_work(hdev->workqueue, &hdev->tx_work);
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	}

	err = len;

done:
	release_sock(sk);
	return err;

drop:
	kfree_skb(skb);
	goto done;
}

1005 1006
static int hci_sock_setsockopt(struct socket *sock, int level, int optname,
			       char __user *optval, unsigned int len)
L
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{
	struct hci_ufilter uf = { .opcode = 0 };
	struct sock *sk = sock->sk;
	int err = 0, opt = 0;

	BT_DBG("sk %p, opt %d", sk, optname);

	lock_sock(sk);

1016
	if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
1017
		err = -EBADFD;
1018 1019 1020
		goto done;
	}

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1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046
	switch (optname) {
	case HCI_DATA_DIR:
		if (get_user(opt, (int __user *)optval)) {
			err = -EFAULT;
			break;
		}

		if (opt)
			hci_pi(sk)->cmsg_mask |= HCI_CMSG_DIR;
		else
			hci_pi(sk)->cmsg_mask &= ~HCI_CMSG_DIR;
		break;

	case HCI_TIME_STAMP:
		if (get_user(opt, (int __user *)optval)) {
			err = -EFAULT;
			break;
		}

		if (opt)
			hci_pi(sk)->cmsg_mask |= HCI_CMSG_TSTAMP;
		else
			hci_pi(sk)->cmsg_mask &= ~HCI_CMSG_TSTAMP;
		break;

	case HCI_FILTER:
1047 1048 1049 1050 1051 1052 1053 1054 1055
		{
			struct hci_filter *f = &hci_pi(sk)->filter;

			uf.type_mask = f->type_mask;
			uf.opcode    = f->opcode;
			uf.event_mask[0] = *((u32 *) f->event_mask + 0);
			uf.event_mask[1] = *((u32 *) f->event_mask + 1);
		}

L
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1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075
		len = min_t(unsigned int, len, sizeof(uf));
		if (copy_from_user(&uf, optval, len)) {
			err = -EFAULT;
			break;
		}

		if (!capable(CAP_NET_RAW)) {
			uf.type_mask &= hci_sec_filter.type_mask;
			uf.event_mask[0] &= *((u32 *) hci_sec_filter.event_mask + 0);
			uf.event_mask[1] &= *((u32 *) hci_sec_filter.event_mask + 1);
		}

		{
			struct hci_filter *f = &hci_pi(sk)->filter;

			f->type_mask = uf.type_mask;
			f->opcode    = uf.opcode;
			*((u32 *) f->event_mask + 0) = uf.event_mask[0];
			*((u32 *) f->event_mask + 1) = uf.event_mask[1];
		}
1076
		break;
L
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1077 1078 1079 1080 1081 1082

	default:
		err = -ENOPROTOOPT;
		break;
	}

1083
done:
L
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1084 1085 1086 1087
	release_sock(sk);
	return err;
}

1088 1089
static int hci_sock_getsockopt(struct socket *sock, int level, int optname,
			       char __user *optval, int __user *optlen)
L
Linus Torvalds 已提交
1090 1091 1092
{
	struct hci_ufilter uf;
	struct sock *sk = sock->sk;
1093 1094 1095
	int len, opt, err = 0;

	BT_DBG("sk %p, opt %d", sk, optname);
L
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1096 1097 1098 1099

	if (get_user(len, optlen))
		return -EFAULT;

1100 1101 1102
	lock_sock(sk);

	if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
1103
		err = -EBADFD;
1104 1105 1106
		goto done;
	}

L
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1107 1108 1109 1110
	switch (optname) {
	case HCI_DATA_DIR:
		if (hci_pi(sk)->cmsg_mask & HCI_CMSG_DIR)
			opt = 1;
1111
		else
L
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1112 1113 1114
			opt = 0;

		if (put_user(opt, optval))
1115
			err = -EFAULT;
L
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1116 1117 1118 1119 1120
		break;

	case HCI_TIME_STAMP:
		if (hci_pi(sk)->cmsg_mask & HCI_CMSG_TSTAMP)
			opt = 1;
1121
		else
L
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1122 1123 1124
			opt = 0;

		if (put_user(opt, optval))
1125
			err = -EFAULT;
L
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1126 1127 1128 1129 1130 1131
		break;

	case HCI_FILTER:
		{
			struct hci_filter *f = &hci_pi(sk)->filter;

1132
			memset(&uf, 0, sizeof(uf));
L
Linus Torvalds 已提交
1133 1134 1135 1136 1137 1138 1139 1140
			uf.type_mask = f->type_mask;
			uf.opcode    = f->opcode;
			uf.event_mask[0] = *((u32 *) f->event_mask + 0);
			uf.event_mask[1] = *((u32 *) f->event_mask + 1);
		}

		len = min_t(unsigned int, len, sizeof(uf));
		if (copy_to_user(optval, &uf, len))
1141
			err = -EFAULT;
L
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1142 1143 1144
		break;

	default:
1145
		err = -ENOPROTOOPT;
L
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1146 1147 1148
		break;
	}

1149 1150 1151
done:
	release_sock(sk);
	return err;
L
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1152 1153
}

1154
static const struct proto_ops hci_sock_ops = {
L
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1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179
	.family		= PF_BLUETOOTH,
	.owner		= THIS_MODULE,
	.release	= hci_sock_release,
	.bind		= hci_sock_bind,
	.getname	= hci_sock_getname,
	.sendmsg	= hci_sock_sendmsg,
	.recvmsg	= hci_sock_recvmsg,
	.ioctl		= hci_sock_ioctl,
	.poll		= datagram_poll,
	.listen		= sock_no_listen,
	.shutdown	= sock_no_shutdown,
	.setsockopt	= hci_sock_setsockopt,
	.getsockopt	= hci_sock_getsockopt,
	.connect	= sock_no_connect,
	.socketpair	= sock_no_socketpair,
	.accept		= sock_no_accept,
	.mmap		= sock_no_mmap
};

static struct proto hci_sk_proto = {
	.name		= "HCI",
	.owner		= THIS_MODULE,
	.obj_size	= sizeof(struct hci_pinfo)
};

1180 1181
static int hci_sock_create(struct net *net, struct socket *sock, int protocol,
			   int kern)
L
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1182 1183 1184 1185 1186 1187 1188 1189 1190 1191
{
	struct sock *sk;

	BT_DBG("sock %p", sock);

	if (sock->type != SOCK_RAW)
		return -ESOCKTNOSUPPORT;

	sock->ops = &hci_sock_ops;

1192
	sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &hci_sk_proto);
L
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1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208
	if (!sk)
		return -ENOMEM;

	sock_init_data(sock, sk);

	sock_reset_flag(sk, SOCK_ZAPPED);

	sk->sk_protocol = protocol;

	sock->state = SS_UNCONNECTED;
	sk->sk_state = BT_OPEN;

	bt_sock_link(&hci_sk_list, sk);
	return 0;
}

1209
static const struct net_proto_family hci_sock_family_ops = {
L
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	.family	= PF_BLUETOOTH,
	.owner	= THIS_MODULE,
	.create	= hci_sock_create,
};

int __init hci_sock_init(void)
{
	int err;

	err = proto_register(&hci_sk_proto, 0);
	if (err < 0)
		return err;

	err = bt_sock_register(BTPROTO_HCI, &hci_sock_family_ops);
1224 1225
	if (err < 0) {
		BT_ERR("HCI socket registration failed");
L
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1226
		goto error;
1227 1228
	}

1229
	err = bt_procfs_init(&init_net, "hci", &hci_sk_list, NULL);
1230 1231 1232 1233 1234
	if (err < 0) {
		BT_ERR("Failed to create HCI proc file");
		bt_sock_unregister(BTPROTO_HCI);
		goto error;
	}
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	BT_INFO("HCI socket layer initialized");

	return 0;

error:
	proto_unregister(&hci_sk_proto);
	return err;
}

1245
void hci_sock_cleanup(void)
L
Linus Torvalds 已提交
1246
{
1247
	bt_procfs_cleanup(&init_net, "hci");
1248
	bt_sock_unregister(BTPROTO_HCI);
L
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1249 1250
	proto_unregister(&hci_sk_proto);
}