hci_sock.c 24.9 KB
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/*
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   BlueZ - Bluetooth protocol stack for Linux
   Copyright (C) 2000-2001 Qualcomm Incorporated

   Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License version 2 as
   published by the Free Software Foundation;

   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
   IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
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   CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
   WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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   OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

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

/* Bluetooth HCI sockets. */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	return false;
}

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

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

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

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

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		if (hci_pi(sk)->channel == HCI_CHANNEL_RAW) {
			if (is_filtered_packet(sk, skb))
				continue;
		} else if (hci_pi(sk)->channel == HCI_CHANNEL_USER) {
			if (!bt_cb(skb)->incoming)
				continue;
			if (bt_cb(skb)->pkt_type != HCI_EVENT_PKT &&
			    bt_cb(skb)->pkt_type != HCI_ACLDATA_PKT &&
			    bt_cb(skb)->pkt_type != HCI_SCODATA_PKT)
				continue;
		} else {
			/* Don't send frame to other channel types */
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			continue;
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		}
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		if (!skb_copy) {
			/* Create a private copy with headroom */
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			skb_copy = __pskb_copy_fclone(skb, 1, GFP_ATOMIC, true);
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			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:
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		opcode = cpu_to_le16(HCI_MON_COMMAND_PKT);
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		break;
	case HCI_EVENT_PKT:
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		opcode = cpu_to_le16(HCI_MON_EVENT_PKT);
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		break;
	case HCI_ACLDATA_PKT:
		if (bt_cb(skb)->incoming)
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			opcode = cpu_to_le16(HCI_MON_ACL_RX_PKT);
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		else
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			opcode = cpu_to_le16(HCI_MON_ACL_TX_PKT);
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		break;
	case HCI_SCODATA_PKT:
		if (bt_cb(skb)->incoming)
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			opcode = cpu_to_le16(HCI_MON_SCO_RX_PKT);
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		else
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			opcode = cpu_to_le16(HCI_MON_SCO_TX_PKT);
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		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_fclone(skb, HCI_MON_HDR_SIZE,
						      GFP_ATOMIC, true);
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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);

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		opcode = cpu_to_le16(HCI_MON_NEW_INDEX);
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		break;

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

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		opcode = cpu_to_le16(HCI_MON_DEL_INDEX);
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		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;
	hci_send_to_sock(hdev, skb);
	kfree_skb(skb);
}

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

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

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

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

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

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

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

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

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

	if (!sk)
		return 0;

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	hdev = hci_pi(sk)->hdev;

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

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	bt_sock_unlink(&hci_sk_list, sk);

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

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

	sock_orphan(sk);

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

	sock_put(sk);
	return 0;
}

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

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

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

	if (!hdev)
		return -EBADFD;

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

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	if (test_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks))
		return -EOPNOTSUPP;

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

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	switch (cmd) {
	case HCISETRAW:
		if (!capable(CAP_NET_ADMIN))
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			return -EPERM;
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		return -EOPNOTSUPP;
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	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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	return -ENOIOCTLCMD;
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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;
	}

653 654 655 656
	switch (haddr.hci_channel) {
	case HCI_CHANNEL_RAW:
		if (hci_pi(sk)->hdev) {
			err = -EALREADY;
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			goto done;
		}

660 661 662 663 664 665 666 667 668 669 670 671 672
		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;

673 674 675 676 677 678 679 680 681 682 683
	case HCI_CHANNEL_USER:
		if (hci_pi(sk)->hdev) {
			err = -EALREADY;
			goto done;
		}

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

684
		if (!capable(CAP_NET_ADMIN)) {
685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708
			err = -EPERM;
			goto done;
		}

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

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

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

709 710
		if (!test_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks))
			mgmt_index_removed(hdev);
711 712 713 714

		err = hci_dev_open(hdev->id);
		if (err) {
			clear_bit(HCI_USER_CHANNEL, &hdev->dev_flags);
715 716
			if (!test_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks))
				mgmt_index_added(hdev);
717 718 719 720 721 722 723 724 725
			hci_dev_put(hdev);
			goto done;
		}

		atomic_inc(&hdev->promisc);

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

726
	case HCI_CHANNEL_CONTROL:
727
		if (haddr.hci_dev != HCI_DEV_NONE) {
728 729 730 731
			err = -EINVAL;
			goto done;
		}

732 733 734 735 736
		if (!capable(CAP_NET_ADMIN)) {
			err = -EPERM;
			goto done;
		}

737 738
		break;

739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754
	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;

755 756 757
	default:
		err = -EINVAL;
		goto done;
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	}

760

761
	hci_pi(sk)->channel = haddr.hci_channel;
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	sk->sk_state = BT_BOUND;

done:
	release_sock(sk);
	return err;
}

769 770
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;
774 775
	struct hci_dev *hdev;
	int err = 0;
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	BT_DBG("sock %p sk %p", sock, sk);

779 780 781
	if (peer)
		return -EOPNOTSUPP;

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	lock_sock(sk);

784 785 786 787 788 789
	hdev = hci_pi(sk)->hdev;
	if (!hdev) {
		err = -EBADFD;
		goto done;
	}

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	*addr_len = sizeof(*haddr);
	haddr->hci_family = AF_BLUETOOTH;
792
	haddr->hci_dev    = hdev->id;
793
	haddr->hci_channel= hci_pi(sk)->channel;
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795
done:
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796
	release_sock(sk);
797
	return err;
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}

800 801
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;

805 806
	if (mask & HCI_CMSG_DIR) {
		int incoming = bt_cb(skb)->incoming;
807 808
		put_cmsg(msg, SOL_HCI, HCI_CMSG_DIR, sizeof(incoming),
			 &incoming);
809
	}
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810

811
	if (mask & HCI_CMSG_TSTAMP) {
812 813 814
#ifdef CONFIG_COMPAT
		struct compat_timeval ctv;
#endif
815
		struct timeval tv;
816 817
		void *data;
		int len;
818 819

		skb_get_timestamp(skb, &tv);
820

821 822 823
		data = &tv;
		len = sizeof(tv);
#ifdef CONFIG_COMPAT
824 825
		if (!COMPAT_USE_64BIT_TIME &&
		    (msg->msg_flags & MSG_CMSG_COMPAT)) {
826 827 828 829 830
			ctv.tv_sec = tv.tv_sec;
			ctv.tv_usec = tv.tv_usec;
			data = &ctv;
			len = sizeof(ctv);
		}
831
#endif
832 833

		put_cmsg(msg, SOL_HCI, HCI_CMSG_TSTAMP, len, data);
834
	}
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}
836 837

static int hci_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
838
			    struct msghdr *msg, size_t len, int flags)
L
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839 840 841 842 843 844 845 846 847 848 849 850 851 852
{
	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;

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

863
	skb_reset_transport_header(skb);
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	err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);

866 867 868 869
	switch (hci_pi(sk)->channel) {
	case HCI_CHANNEL_RAW:
		hci_sock_cmsg(sk, msg, skb);
		break;
870
	case HCI_CHANNEL_USER:
871
	case HCI_CHANNEL_CONTROL:
872 873 874
	case HCI_CHANNEL_MONITOR:
		sock_recv_timestamp(msg, sk, skb);
		break;
875
	}
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	skb_free_datagram(sk, skb);

	return err ? : copied;
}

882
static int hci_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
L
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883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902
			    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);

903 904
	switch (hci_pi(sk)->channel) {
	case HCI_CHANNEL_RAW:
905
	case HCI_CHANNEL_USER:
906 907 908 909
		break;
	case HCI_CHANNEL_CONTROL:
		err = mgmt_control(sk, msg, len);
		goto done;
910 911 912
	case HCI_CHANNEL_MONITOR:
		err = -EOPNOTSUPP;
		goto done;
913 914 915 916 917
	default:
		err = -EINVAL;
		goto done;
	}

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

924 925 926 927 928
	if (!test_bit(HCI_UP, &hdev->flags)) {
		err = -ENETDOWN;
		goto done;
	}

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

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

938
	bt_cb(skb)->pkt_type = *((unsigned char *) skb->data);
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	skb_pull(skb, 1);

941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956
	if (hci_pi(sk)->channel == HCI_CHANNEL_USER) {
		/* No permission check is needed for user channel
		 * since that gets enforced when binding the socket.
		 *
		 * However check that the packet type is valid.
		 */
		if (bt_cb(skb)->pkt_type != HCI_COMMAND_PKT &&
		    bt_cb(skb)->pkt_type != HCI_ACLDATA_PKT &&
		    bt_cb(skb)->pkt_type != HCI_SCODATA_PKT) {
			err = -EINVAL;
			goto drop;
		}

		skb_queue_tail(&hdev->raw_q, skb);
		queue_work(hdev->workqueue, &hdev->tx_work);
	} else if (bt_cb(skb)->pkt_type == HCI_COMMAND_PKT) {
957
		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) ||
962 963 964
		     !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;
		}

969
		if (ogf == 0x3f) {
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			skb_queue_tail(&hdev->raw_q, skb);
971
			queue_work(hdev->workqueue, &hdev->tx_work);
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		} else {
973 974 975 976 977
			/* 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);
979
			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);
988
		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;
}

1002 1003
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);

1013
	if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
1014
		err = -EBADFD;
1015 1016 1017
		goto done;
	}

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1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043
	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:
1044 1045 1046 1047 1048 1049 1050 1051 1052
		{
			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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1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072
		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];
		}
1073
		break;
L
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1074 1075 1076 1077 1078 1079

	default:
		err = -ENOPROTOOPT;
		break;
	}

1080
done:
L
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1081 1082 1083 1084
	release_sock(sk);
	return err;
}

1085 1086
static int hci_sock_getsockopt(struct socket *sock, int level, int optname,
			       char __user *optval, int __user *optlen)
L
Linus Torvalds 已提交
1087 1088 1089
{
	struct hci_ufilter uf;
	struct sock *sk = sock->sk;
1090 1091 1092
	int len, opt, err = 0;

	BT_DBG("sk %p, opt %d", sk, optname);
L
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1093 1094 1095 1096

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

1097 1098 1099
	lock_sock(sk);

	if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
1100
		err = -EBADFD;
1101 1102 1103
		goto done;
	}

L
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1104 1105 1106 1107
	switch (optname) {
	case HCI_DATA_DIR:
		if (hci_pi(sk)->cmsg_mask & HCI_CMSG_DIR)
			opt = 1;
1108
		else
L
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1109 1110 1111
			opt = 0;

		if (put_user(opt, optval))
1112
			err = -EFAULT;
L
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1113 1114 1115 1116 1117
		break;

	case HCI_TIME_STAMP:
		if (hci_pi(sk)->cmsg_mask & HCI_CMSG_TSTAMP)
			opt = 1;
1118
		else
L
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1119 1120 1121
			opt = 0;

		if (put_user(opt, optval))
1122
			err = -EFAULT;
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1123 1124 1125 1126 1127 1128
		break;

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

1129
			memset(&uf, 0, sizeof(uf));
L
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1130 1131 1132 1133 1134 1135 1136 1137
			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))
1138
			err = -EFAULT;
L
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1139 1140 1141
		break;

	default:
1142
		err = -ENOPROTOOPT;
L
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1143 1144 1145
		break;
	}

1146 1147 1148
done:
	release_sock(sk);
	return err;
L
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1149 1150
}

1151
static const struct proto_ops hci_sock_ops = {
L
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1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176
	.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)
};

1177 1178
static int hci_sock_create(struct net *net, struct socket *sock, int protocol,
			   int kern)
L
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1179 1180 1181 1182 1183 1184 1185 1186 1187 1188
{
	struct sock *sk;

	BT_DBG("sock %p", sock);

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

	sock->ops = &hci_sock_ops;

1189
	sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &hci_sk_proto);
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1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205
	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;
}

1206
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);
1221 1222
	if (err < 0) {
		BT_ERR("HCI socket registration failed");
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1223
		goto error;
1224 1225
	}

1226
	err = bt_procfs_init(&init_net, "hci", &hci_sk_list, NULL);
1227 1228 1229 1230 1231
	if (err < 0) {
		BT_ERR("Failed to create HCI proc file");
		bt_sock_unregister(BTPROTO_HCI);
		goto error;
	}
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1232 1233 1234 1235 1236 1237 1238 1239 1240 1241

	BT_INFO("HCI socket layer initialized");

	return 0;

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

1242
void hci_sock_cleanup(void)
L
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1243
{
1244
	bt_procfs_cleanup(&init_net, "hci");
1245
	bt_sock_unregister(BTPROTO_HCI);
L
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1246 1247
	proto_unregister(&hci_sk_proto);
}