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;

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

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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;
	}

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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) {
666 667 668 669
			err = -EINVAL;
			goto done;
		}

670 671 672 673 674
		if (!capable(CAP_NET_ADMIN)) {
			err = -EPERM;
			goto done;
		}

675 676
		break;

677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692
	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;

693 694 695
	default:
		err = -EINVAL;
		goto done;
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	}

698

699
	hci_pi(sk)->channel = haddr.hci_channel;
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	sk->sk_state = BT_BOUND;

done:
	release_sock(sk);
	return err;
}

707 708
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;
712 713
	struct hci_dev *hdev;
	int err = 0;
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	BT_DBG("sock %p sk %p", sock, sk);

717 718 719
	if (peer)
		return -EOPNOTSUPP;

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	lock_sock(sk);

722 723 724 725 726 727
	hdev = hci_pi(sk)->hdev;
	if (!hdev) {
		err = -EBADFD;
		goto done;
	}

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	*addr_len = sizeof(*haddr);
	haddr->hci_family = AF_BLUETOOTH;
730
	haddr->hci_dev    = hdev->id;
731
	haddr->hci_channel= hci_pi(sk)->channel;
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732

733
done:
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734
	release_sock(sk);
735
	return err;
L
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}

738 739
static void hci_sock_cmsg(struct sock *sk, struct msghdr *msg,
			  struct sk_buff *skb)
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{
	__u32 mask = hci_pi(sk)->cmsg_mask;

743 744
	if (mask & HCI_CMSG_DIR) {
		int incoming = bt_cb(skb)->incoming;
745 746
		put_cmsg(msg, SOL_HCI, HCI_CMSG_DIR, sizeof(incoming),
			 &incoming);
747
	}
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748

749
	if (mask & HCI_CMSG_TSTAMP) {
750 751 752
#ifdef CONFIG_COMPAT
		struct compat_timeval ctv;
#endif
753
		struct timeval tv;
754 755
		void *data;
		int len;
756 757

		skb_get_timestamp(skb, &tv);
758

759 760 761
		data = &tv;
		len = sizeof(tv);
#ifdef CONFIG_COMPAT
762 763
		if (!COMPAT_USE_64BIT_TIME &&
		    (msg->msg_flags & MSG_CMSG_COMPAT)) {
764 765 766 767 768
			ctv.tv_sec = tv.tv_sec;
			ctv.tv_usec = tv.tv_usec;
			data = &ctv;
			len = sizeof(ctv);
		}
769
#endif
770 771

		put_cmsg(msg, SOL_HCI, HCI_CMSG_TSTAMP, len, data);
772
	}
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}
774 775

static int hci_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
776
			    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;

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;
	}

803
	skb_reset_transport_header(skb);
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	err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);

806 807 808 809
	switch (hci_pi(sk)->channel) {
	case HCI_CHANNEL_RAW:
		hci_sock_cmsg(sk, msg, skb);
		break;
810
	case HCI_CHANNEL_CONTROL:
811 812 813
	case HCI_CHANNEL_MONITOR:
		sock_recv_timestamp(msg, sk, skb);
		break;
814
	}
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	skb_free_datagram(sk, skb);

	return err ? : copied;
}

821
static int hci_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
L
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822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841
			    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);

842 843 844 845 846 847
	switch (hci_pi(sk)->channel) {
	case HCI_CHANNEL_RAW:
		break;
	case HCI_CHANNEL_CONTROL:
		err = mgmt_control(sk, msg, len);
		goto done;
848 849 850
	case HCI_CHANNEL_MONITOR:
		err = -EOPNOTSUPP;
		goto done;
851 852 853 854 855
	default:
		err = -EINVAL;
		goto done;
	}

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

862 863 864 865 866
	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;
	}

876
	bt_cb(skb)->pkt_type = *((unsigned char *) skb->data);
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	skb_pull(skb, 1);
	skb->dev = (void *) hdev;

880
	if (bt_cb(skb)->pkt_type == HCI_COMMAND_PKT) {
881
		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) ||
886 887 888
		     !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;
		}

893
		if (test_bit(HCI_RAW, &hdev->flags) || (ogf == 0x3f)) {
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			skb_queue_tail(&hdev->raw_q, skb);
895
			queue_work(hdev->workqueue, &hdev->tx_work);
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		} else {
897 898 899 900 901
			/* 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);
903
			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);
912
		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;
}

926 927
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);

937
	if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
938
		err = -EBADFD;
939 940 941
		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:
968 969 970 971 972 973 974 975 976
		{
			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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977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996
		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];
		}
997
		break;
L
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	default:
		err = -ENOPROTOOPT;
		break;
	}

1004
done:
L
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1005 1006 1007 1008
	release_sock(sk);
	return err;
}

1009 1010
static int hci_sock_getsockopt(struct socket *sock, int level, int optname,
			       char __user *optval, int __user *optlen)
L
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1011 1012 1013
{
	struct hci_ufilter uf;
	struct sock *sk = sock->sk;
1014 1015 1016
	int len, opt, err = 0;

	BT_DBG("sk %p, opt %d", sk, optname);
L
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1017 1018 1019 1020

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

1021 1022 1023
	lock_sock(sk);

	if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
1024
		err = -EBADFD;
1025 1026 1027
		goto done;
	}

L
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1028 1029 1030 1031
	switch (optname) {
	case HCI_DATA_DIR:
		if (hci_pi(sk)->cmsg_mask & HCI_CMSG_DIR)
			opt = 1;
1032
		else
L
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1033 1034 1035
			opt = 0;

		if (put_user(opt, optval))
1036
			err = -EFAULT;
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1037 1038 1039 1040 1041
		break;

	case HCI_TIME_STAMP:
		if (hci_pi(sk)->cmsg_mask & HCI_CMSG_TSTAMP)
			opt = 1;
1042
		else
L
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1043 1044 1045
			opt = 0;

		if (put_user(opt, optval))
1046
			err = -EFAULT;
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1047 1048 1049 1050 1051 1052
		break;

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

1053
			memset(&uf, 0, sizeof(uf));
L
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1054 1055 1056 1057 1058 1059 1060 1061
			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))
1062
			err = -EFAULT;
L
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1063 1064 1065
		break;

	default:
1066
		err = -ENOPROTOOPT;
L
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1067 1068 1069
		break;
	}

1070 1071 1072
done:
	release_sock(sk);
	return err;
L
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1073 1074
}

1075
static const struct proto_ops hci_sock_ops = {
L
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1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100
	.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)
};

1101 1102
static int hci_sock_create(struct net *net, struct socket *sock, int protocol,
			   int kern)
L
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1103 1104 1105 1106 1107 1108 1109 1110 1111 1112
{
	struct sock *sk;

	BT_DBG("sock %p", sock);

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

	sock->ops = &hci_sock_ops;

1113
	sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &hci_sk_proto);
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1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129
	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;
}

1130
static const struct net_proto_family hci_sock_family_ops = {
L
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1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144
	.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);
1145 1146
	if (err < 0) {
		BT_ERR("HCI socket registration failed");
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1147
		goto error;
1148 1149
	}

1150
	err = bt_procfs_init(&init_net, "hci", &hci_sk_list, NULL);
1151 1152 1153 1154 1155
	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;
}

1166
void hci_sock_cleanup(void)
L
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{
1168
	bt_procfs_cleanup(&init_net, "hci");
1169
	bt_sock_unregister(BTPROTO_HCI);
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	proto_unregister(&hci_sk_proto);
}