hci_sock.c 23.1 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)
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			continue;

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		if (is_filtered_packet(sk, skb))
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			continue;

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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) {
		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;

	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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	default:
		if (hdev->ioctl)
			return hdev->ioctl(hdev, cmd, arg);
		return -EINVAL;
	}
}

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

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

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		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;

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

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

672 673
		break;

674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689
	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;

690 691 692
	default:
		err = -EINVAL;
		goto done;
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	}

695

696
	hci_pi(sk)->channel = haddr.hci_channel;
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	sk->sk_state = BT_BOUND;

done:
	release_sock(sk);
	return err;
}

704 705
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;
709 710
	struct hci_dev *hdev;
	int err = 0;
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	BT_DBG("sock %p sk %p", sock, sk);

714 715 716
	if (peer)
		return -EOPNOTSUPP;

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	lock_sock(sk);

719 720 721 722 723 724
	hdev = hci_pi(sk)->hdev;
	if (!hdev) {
		err = -EBADFD;
		goto done;
	}

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	*addr_len = sizeof(*haddr);
	haddr->hci_family = AF_BLUETOOTH;
727
	haddr->hci_dev    = hdev->id;
728
	haddr->hci_channel= hci_pi(sk)->channel;
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730
done:
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	release_sock(sk);
732
	return err;
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}

735 736
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;

740 741
	if (mask & HCI_CMSG_DIR) {
		int incoming = bt_cb(skb)->incoming;
742 743
		put_cmsg(msg, SOL_HCI, HCI_CMSG_DIR, sizeof(incoming),
			 &incoming);
744
	}
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745

746
	if (mask & HCI_CMSG_TSTAMP) {
747 748 749
#ifdef CONFIG_COMPAT
		struct compat_timeval ctv;
#endif
750
		struct timeval tv;
751 752
		void *data;
		int len;
753 754

		skb_get_timestamp(skb, &tv);
755

756 757 758
		data = &tv;
		len = sizeof(tv);
#ifdef CONFIG_COMPAT
759 760
		if (!COMPAT_USE_64BIT_TIME &&
		    (msg->msg_flags & MSG_CMSG_COMPAT)) {
761 762 763 764 765
			ctv.tv_sec = tv.tv_sec;
			ctv.tv_usec = tv.tv_usec;
			data = &ctv;
			len = sizeof(ctv);
		}
766
#endif
767 768

		put_cmsg(msg, SOL_HCI, HCI_CMSG_TSTAMP, len, data);
769
	}
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}
771 772

static int hci_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
773
			    struct msghdr *msg, size_t len, int flags)
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{
	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;

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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;
	}

800
	skb_reset_transport_header(skb);
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	err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);

803 804 805 806
	switch (hci_pi(sk)->channel) {
	case HCI_CHANNEL_RAW:
		hci_sock_cmsg(sk, msg, skb);
		break;
807
	case HCI_CHANNEL_CONTROL:
808 809 810
	case HCI_CHANNEL_MONITOR:
		sock_recv_timestamp(msg, sk, skb);
		break;
811
	}
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	skb_free_datagram(sk, skb);

	return err ? : copied;
}

818
static int hci_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
L
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			    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);

839 840 841 842 843 844
	switch (hci_pi(sk)->channel) {
	case HCI_CHANNEL_RAW:
		break;
	case HCI_CHANNEL_CONTROL:
		err = mgmt_control(sk, msg, len);
		goto done;
845 846 847
	case HCI_CHANNEL_MONITOR:
		err = -EOPNOTSUPP;
		goto done;
848 849 850 851 852
	default:
		err = -EINVAL;
		goto done;
	}

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

859 860 861 862 863
	if (!test_bit(HCI_UP, &hdev->flags)) {
		err = -ENETDOWN;
		goto done;
	}

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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;
	}

873
	bt_cb(skb)->pkt_type = *((unsigned char *) skb->data);
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	skb_pull(skb, 1);
	skb->dev = (void *) hdev;

877
	if (bt_cb(skb)->pkt_type == HCI_COMMAND_PKT) {
878
		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) ||
883 884 885
		     !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;
		}

890
		if (test_bit(HCI_RAW, &hdev->flags) || (ogf == 0x3f)) {
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			skb_queue_tail(&hdev->raw_q, skb);
892
			queue_work(hdev->workqueue, &hdev->tx_work);
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		} else {
894 895 896 897 898
			/* 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);
900
			queue_work(hdev->workqueue, &hdev->cmd_work);
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		}
	} else {
		if (!capable(CAP_NET_RAW)) {
			err = -EPERM;
			goto drop;
		}

		skb_queue_tail(&hdev->raw_q, skb);
909
		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;
}

923 924
static int hci_sock_setsockopt(struct socket *sock, int level, int optname,
			       char __user *optval, unsigned int len)
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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);

934
	if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
935
		err = -EBADFD;
936 937 938
		goto done;
	}

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	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:
965 966 967 968 969 970 971 972 973
		{
			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);
		}

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974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993
		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];
		}
994
		break;
L
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	default:
		err = -ENOPROTOOPT;
		break;
	}

1001
done:
L
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	release_sock(sk);
	return err;
}

1006 1007
static int hci_sock_getsockopt(struct socket *sock, int level, int optname,
			       char __user *optval, int __user *optlen)
L
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1008 1009 1010
{
	struct hci_ufilter uf;
	struct sock *sk = sock->sk;
1011 1012 1013
	int len, opt, err = 0;

	BT_DBG("sk %p, opt %d", sk, optname);
L
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1014 1015 1016 1017

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

1018 1019 1020
	lock_sock(sk);

	if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
1021
		err = -EBADFD;
1022 1023 1024
		goto done;
	}

L
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1025 1026 1027 1028
	switch (optname) {
	case HCI_DATA_DIR:
		if (hci_pi(sk)->cmsg_mask & HCI_CMSG_DIR)
			opt = 1;
1029
		else
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1030 1031 1032
			opt = 0;

		if (put_user(opt, optval))
1033
			err = -EFAULT;
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		break;

	case HCI_TIME_STAMP:
		if (hci_pi(sk)->cmsg_mask & HCI_CMSG_TSTAMP)
			opt = 1;
1039
		else
L
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1040 1041 1042
			opt = 0;

		if (put_user(opt, optval))
1043
			err = -EFAULT;
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1044 1045 1046 1047 1048 1049
		break;

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

1050
			memset(&uf, 0, sizeof(uf));
L
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1051 1052 1053 1054 1055 1056 1057 1058
			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))
1059
			err = -EFAULT;
L
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1060 1061 1062
		break;

	default:
1063
		err = -ENOPROTOOPT;
L
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1064 1065 1066
		break;
	}

1067 1068 1069
done:
	release_sock(sk);
	return err;
L
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1070 1071
}

1072
static const struct proto_ops hci_sock_ops = {
L
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1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097
	.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)
};

1098 1099
static int hci_sock_create(struct net *net, struct socket *sock, int protocol,
			   int kern)
L
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1100 1101 1102 1103 1104 1105 1106 1107 1108 1109
{
	struct sock *sk;

	BT_DBG("sock %p", sock);

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

	sock->ops = &hci_sock_ops;

1110
	sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &hci_sk_proto);
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1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126
	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;
}

1127
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);
1142 1143
	if (err < 0) {
		BT_ERR("HCI socket registration failed");
L
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1144
		goto error;
1145 1146
	}

1147
	err = bt_procfs_init(&init_net, "hci", &hci_sk_list, NULL);
1148 1149 1150 1151 1152
	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;
}

1163
void hci_sock_cleanup(void)
L
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{
1165
	bt_procfs_cleanup(&init_net, "hci");
1166
	bt_sock_unregister(BTPROTO_HCI);
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	proto_unregister(&hci_sk_proto);
}