hci_sock.c 22.5 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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};

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

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		if (!test_bit((bt_cb(skb)->pkt_type == HCI_VENDOR_PKT) ?
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			      0 : (bt_cb(skb)->pkt_type & HCI_FLT_TYPE_BITS),
			      &flt->type_mask))
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			continue;

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		if (bt_cb(skb)->pkt_type == HCI_EVENT_PKT) {
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			int evt = (*(__u8 *)skb->data & HCI_FLT_EVENT_BITS);
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			if (!hci_test_bit(evt, &flt->event_mask))
				continue;

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			if (flt->opcode &&
			    ((evt == HCI_EV_CMD_COMPLETE &&
			      flt->opcode !=
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			      get_unaligned((__le16 *)(skb->data + 3))) ||
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			     (evt == HCI_EV_CMD_STATUS &&
			      flt->opcode !=
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			      get_unaligned((__le16 *)(skb->data + 4)))))
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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);

	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);

	default:
		lock_sock(sk);
		err = hci_sock_bound_ioctl(sk, cmd, arg);
		release_sock(sk);
		return err;
	}
}

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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;
		}

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		break;

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	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;

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	default:
		err = -EINVAL;
		goto done;
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	}

666

667
	hci_pi(sk)->channel = haddr.hci_channel;
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	sk->sk_state = BT_BOUND;

done:
	release_sock(sk);
	return err;
}

675 676
static int hci_sock_getname(struct socket *sock, struct sockaddr *addr,
			    int *addr_len, int peer)
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{
	struct sockaddr_hci *haddr = (struct sockaddr_hci *) addr;
	struct sock *sk = sock->sk;
680
	struct hci_dev *hdev = hci_pi(sk)->hdev;
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	BT_DBG("sock %p sk %p", sock, sk);

684 685 686
	if (!hdev)
		return -EBADFD;

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	lock_sock(sk);

	*addr_len = sizeof(*haddr);
	haddr->hci_family = AF_BLUETOOTH;
691
	haddr->hci_dev    = hdev->id;
692
	haddr->hci_channel= 0;
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	release_sock(sk);
	return 0;
}

698 699
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;

703 704
	if (mask & HCI_CMSG_DIR) {
		int incoming = bt_cb(skb)->incoming;
705 706
		put_cmsg(msg, SOL_HCI, HCI_CMSG_DIR, sizeof(incoming),
			 &incoming);
707
	}
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709
	if (mask & HCI_CMSG_TSTAMP) {
710 711 712
#ifdef CONFIG_COMPAT
		struct compat_timeval ctv;
#endif
713
		struct timeval tv;
714 715
		void *data;
		int len;
716 717

		skb_get_timestamp(skb, &tv);
718

719 720 721
		data = &tv;
		len = sizeof(tv);
#ifdef CONFIG_COMPAT
722 723
		if (!COMPAT_USE_64BIT_TIME &&
		    (msg->msg_flags & MSG_CMSG_COMPAT)) {
724 725 726 727 728
			ctv.tv_sec = tv.tv_sec;
			ctv.tv_usec = tv.tv_usec;
			data = &ctv;
			len = sizeof(ctv);
		}
729
#endif
730 731

		put_cmsg(msg, SOL_HCI, HCI_CMSG_TSTAMP, len, data);
732
	}
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}
734 735

static int hci_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
736
			    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;
	}

763
	skb_reset_transport_header(skb);
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	err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);

766 767 768 769
	switch (hci_pi(sk)->channel) {
	case HCI_CHANNEL_RAW:
		hci_sock_cmsg(sk, msg, skb);
		break;
770
	case HCI_CHANNEL_CONTROL:
771 772 773
	case HCI_CHANNEL_MONITOR:
		sock_recv_timestamp(msg, sk, skb);
		break;
774
	}
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	skb_free_datagram(sk, skb);

	return err ? : copied;
}

781
static int hci_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
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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);

802 803 804 805 806 807
	switch (hci_pi(sk)->channel) {
	case HCI_CHANNEL_RAW:
		break;
	case HCI_CHANNEL_CONTROL:
		err = mgmt_control(sk, msg, len);
		goto done;
808 809 810
	case HCI_CHANNEL_MONITOR:
		err = -EOPNOTSUPP;
		goto done;
811 812 813 814 815
	default:
		err = -EINVAL;
		goto done;
	}

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

822 823 824 825 826
	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;
	}

836
	bt_cb(skb)->pkt_type = *((unsigned char *) skb->data);
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	skb_pull(skb, 1);
	skb->dev = (void *) hdev;

840
	if (bt_cb(skb)->pkt_type == HCI_COMMAND_PKT) {
841
		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) ||
846 847 848
		     !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;
		}

853
		if (test_bit(HCI_RAW, &hdev->flags) || (ogf == 0x3f)) {
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			skb_queue_tail(&hdev->raw_q, skb);
855
			queue_work(hdev->workqueue, &hdev->tx_work);
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		} else {
			skb_queue_tail(&hdev->cmd_q, skb);
858
			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);
867
		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;
}

881 882
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);

892 893 894 895 896
	if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
		err = -EINVAL;
		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:
923 924 925 926 927 928 929 930 931
		{
			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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		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];
		}
952
		break;
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	default:
		err = -ENOPROTOOPT;
		break;
	}

959
done:
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	release_sock(sk);
	return err;
}

964 965
static int hci_sock_getsockopt(struct socket *sock, int level, int optname,
			       char __user *optval, int __user *optlen)
L
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{
	struct hci_ufilter uf;
	struct sock *sk = sock->sk;
969 970 971
	int len, opt, err = 0;

	BT_DBG("sk %p, opt %d", sk, optname);
L
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	if (get_user(len, optlen))
		return -EFAULT;

976 977 978 979 980 981 982
	lock_sock(sk);

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

L
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	switch (optname) {
	case HCI_DATA_DIR:
		if (hci_pi(sk)->cmsg_mask & HCI_CMSG_DIR)
			opt = 1;
987
		else
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			opt = 0;

		if (put_user(opt, optval))
991
			err = -EFAULT;
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		break;

	case HCI_TIME_STAMP:
		if (hci_pi(sk)->cmsg_mask & HCI_CMSG_TSTAMP)
			opt = 1;
997
		else
L
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			opt = 0;

		if (put_user(opt, optval))
1001
			err = -EFAULT;
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		break;

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

1008
			memset(&uf, 0, sizeof(uf));
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1009 1010 1011 1012 1013 1014 1015 1016
			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))
1017
			err = -EFAULT;
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1018 1019 1020
		break;

	default:
1021
		err = -ENOPROTOOPT;
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1022 1023 1024
		break;
	}

1025 1026 1027
done:
	release_sock(sk);
	return err;
L
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}

1030
static const struct proto_ops hci_sock_ops = {
L
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	.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)
};

1056 1057
static int hci_sock_create(struct net *net, struct socket *sock, int protocol,
			   int kern)
L
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{
	struct sock *sk;

	BT_DBG("sock %p", sock);

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

	sock->ops = &hci_sock_ops;

1068
	sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &hci_sk_proto);
L
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1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084
	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;
}

1085
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);
1100 1101
	if (err < 0) {
		BT_ERR("HCI socket registration failed");
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		goto error;
1103 1104 1105 1106 1107 1108 1109 1110
	}

	err = bt_procfs_init(THIS_MODULE, &init_net, "hci", &hci_sk_list, NULL);
	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;
}

1121
void hci_sock_cleanup(void)
L
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{
1123
	bt_procfs_cleanup(&init_net, "hci");
1124
	bt_sock_unregister(BTPROTO_HCI);
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	proto_unregister(&hci_sk_proto);
}