hci_sock.c 31.5 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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#include <net/bluetooth/mgmt.h>

#include "mgmt_util.h"
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static LIST_HEAD(mgmt_chan_list);
static DEFINE_MUTEX(mgmt_chan_list_lock);

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static atomic_t monitor_promisc = ATOMIC_INIT(0);

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

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/* Socket info */
#define hci_pi(sk) ((struct hci_pinfo *) sk)

struct hci_pinfo {
	struct bt_sock    bt;
	struct hci_dev    *hdev;
	struct hci_filter filter;
	__u32             cmsg_mask;
	unsigned short    channel;
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	unsigned long     flags;
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};

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void hci_sock_set_flag(struct sock *sk, int nr)
{
	set_bit(nr, &hci_pi(sk)->flags);
}

void hci_sock_clear_flag(struct sock *sk, int nr)
{
	clear_bit(nr, &hci_pi(sk)->flags);
}

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int hci_sock_test_flag(struct sock *sk, int nr)
{
	return test_bit(nr, &hci_pi(sk)->flags);
}

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unsigned short hci_sock_get_channel(struct sock *sk)
{
	return hci_pi(sk)->channel;
}

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

/* Security filter */
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#define HCI_SFLT_MAX_OGF  5

struct hci_sec_filter {
	__u32 type_mask;
	__u32 event_mask[2];
	__u32 ocf_mask[HCI_SFLT_MAX_OGF + 1][4];
};

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static const struct hci_sec_filter hci_sec_filter = {
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	/* 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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}

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/* Send frame to sockets with specific channel */
void hci_send_to_channel(unsigned short channel, struct sk_buff *skb,
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			 int flag, struct sock *skip_sk)
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{
	struct sock *sk;

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

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		/* Ignore socket without the flag set */
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		if (!hci_sock_test_flag(sk, flag))
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			continue;

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

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

		if (hci_pi(sk)->channel != channel)
			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);
}

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/* Send frame to monitor socket */
void hci_send_to_monitor(struct hci_dev *hdev, struct sk_buff *skb)
{
	struct sk_buff *skb_copy = NULL;
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	struct hci_mon_hdr *hdr;
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	__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;
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	case HCI_DIAG_PKT:
		opcode = cpu_to_le16(HCI_MON_VENDOR_DIAG);
		break;
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	default:
		return;
	}

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	/* Create a private copy with headroom */
	skb_copy = __pskb_copy_fclone(skb, HCI_MON_HDR_SIZE, GFP_ATOMIC, true);
	if (!skb_copy)
		return;

	/* 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);

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	hci_send_to_channel(HCI_CHANNEL_MONITOR, skb_copy,
			    HCI_SOCK_TRUSTED, NULL);
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	kfree_skb(skb_copy);
}

static struct sk_buff *create_monitor_event(struct hci_dev *hdev, int event)
{
	struct hci_mon_hdr *hdr;
	struct hci_mon_new_index *ni;
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	struct hci_mon_index_info *ii;
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	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;

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		ni = (void *)skb_put(skb, HCI_MON_NEW_INDEX_SIZE);
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		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;

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	case HCI_DEV_UP:
		skb = bt_skb_alloc(HCI_MON_INDEX_INFO_SIZE, GFP_ATOMIC);
		if (!skb)
			return NULL;

		ii = (void *)skb_put(skb, HCI_MON_INDEX_INFO_SIZE);
		bacpy(&ii->bdaddr, &hdev->bdaddr);
		ii->manufacturer = cpu_to_le16(hdev->manufacturer);

		opcode = cpu_to_le16(HCI_MON_INDEX_INFO);
		break;

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

		opcode = cpu_to_le16(HCI_MON_OPEN_INDEX);
		break;

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

		opcode = cpu_to_le16(HCI_MON_CLOSE_INDEX);
		break;

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	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);
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		if (!test_bit(HCI_RUNNING, &hdev->flags))
			continue;

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

		if (sock_queue_rcv_skb(sk, skb))
			kfree_skb(skb);
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		if (!test_bit(HCI_UP, &hdev->flags))
			continue;

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

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

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

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	if (atomic_read(&monitor_promisc)) {
		struct sk_buff *skb;

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		/* Send event to monitor */
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		skb = create_monitor_event(hdev, event);
		if (skb) {
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			hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
					    HCI_SOCK_TRUSTED, NULL);
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			kfree_skb(skb);
		}
	}

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	if (event <= HCI_DEV_DOWN) {
		struct hci_ev_si_device ev;

		/* Send event to sockets */
		ev.event  = event;
		ev.dev_id = hdev->id;
		hci_si_event(NULL, HCI_EV_SI_DEVICE, sizeof(ev), &ev);
	}
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	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 struct hci_mgmt_chan *__hci_mgmt_chan_find(unsigned short channel)
{
	struct hci_mgmt_chan *c;

	list_for_each_entry(c, &mgmt_chan_list, list) {
		if (c->channel == channel)
			return c;
	}

	return NULL;
}

static struct hci_mgmt_chan *hci_mgmt_chan_find(unsigned short channel)
{
	struct hci_mgmt_chan *c;

	mutex_lock(&mgmt_chan_list_lock);
	c = __hci_mgmt_chan_find(channel);
	mutex_unlock(&mgmt_chan_list_lock);

	return c;
}

int hci_mgmt_chan_register(struct hci_mgmt_chan *c)
{
	if (c->channel < HCI_CHANNEL_CONTROL)
		return -EINVAL;

	mutex_lock(&mgmt_chan_list_lock);
	if (__hci_mgmt_chan_find(c->channel)) {
		mutex_unlock(&mgmt_chan_list_lock);
		return -EALREADY;
	}

	list_add_tail(&c->list, &mgmt_chan_list);

	mutex_unlock(&mgmt_chan_list_lock);

	return 0;
}
EXPORT_SYMBOL(hci_mgmt_chan_register);

void hci_mgmt_chan_unregister(struct hci_mgmt_chan *c)
{
	mutex_lock(&mgmt_chan_list_lock);
	list_del(&c->list);
	mutex_unlock(&mgmt_chan_list_lock);
}
EXPORT_SYMBOL(hci_mgmt_chan_unregister);

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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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			/* When releasing an user channel exclusive access,
			 * call hci_dev_do_close directly instead of calling
			 * hci_dev_close to ensure the exclusive access will
			 * be released and the controller brought back down.
			 *
			 * The checking of HCI_AUTO_OFF is not needed in this
			 * case since it will have been cleared already when
			 * opening the user channel.
			 */
			hci_dev_do_close(hdev);
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			hci_dev_clear_flag(hdev, HCI_USER_CHANNEL);
			mgmt_index_added(hdev);
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		}

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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_bdaddr_list_add(&hdev->blacklist, &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_bdaddr_list_del(&hdev->blacklist, &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 (hci_dev_test_flag(hdev, HCI_USER_CHANNEL))
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		return -EBUSY;

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	if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED))
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		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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Linus Torvalds 已提交
650

651 652
	case HCIBLOCKADDR:
		if (!capable(CAP_NET_ADMIN))
653
			return -EPERM;
654
		return hci_sock_blacklist_add(hdev, (void __user *) arg);
655 656 657

	case HCIUNBLOCKADDR:
		if (!capable(CAP_NET_ADMIN))
658
			return -EPERM;
659
		return hci_sock_blacklist_del(hdev, (void __user *) arg);
L
Linus Torvalds 已提交
660
	}
661

662
	return -ENOIOCTLCMD;
L
Linus Torvalds 已提交
663 664
}

665 666
static int hci_sock_ioctl(struct socket *sock, unsigned int cmd,
			  unsigned long arg)
L
Linus Torvalds 已提交
667
{
668
	void __user *argp = (void __user *) arg;
669
	struct sock *sk = sock->sk;
L
Linus Torvalds 已提交
670 671 672 673
	int err;

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

674 675 676 677 678 679 680 681 682
	lock_sock(sk);

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

	release_sock(sk);

L
Linus Torvalds 已提交
683 684 685 686 687 688 689 690 691 692 693 694
	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))
695
			return -EPERM;
L
Linus Torvalds 已提交
696 697 698 699
		return hci_dev_open(arg);

	case HCIDEVDOWN:
		if (!capable(CAP_NET_ADMIN))
700
			return -EPERM;
L
Linus Torvalds 已提交
701 702 703 704
		return hci_dev_close(arg);

	case HCIDEVRESET:
		if (!capable(CAP_NET_ADMIN))
705
			return -EPERM;
L
Linus Torvalds 已提交
706 707 708 709
		return hci_dev_reset(arg);

	case HCIDEVRESTAT:
		if (!capable(CAP_NET_ADMIN))
710
			return -EPERM;
L
Linus Torvalds 已提交
711 712 713 714 715 716 717 718 719 720 721
		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))
722
			return -EPERM;
L
Linus Torvalds 已提交
723 724 725 726 727
		return hci_dev_cmd(cmd, argp);

	case HCIINQUIRY:
		return hci_inquiry(argp);
	}
728 729 730 731 732 733 734 735

	lock_sock(sk);

	err = hci_sock_bound_ioctl(sk, cmd, arg);

done:
	release_sock(sk);
	return err;
L
Linus Torvalds 已提交
736 737
}

738 739
static int hci_sock_bind(struct socket *sock, struct sockaddr *addr,
			 int addr_len)
L
Linus Torvalds 已提交
740
{
741
	struct sockaddr_hci haddr;
L
Linus Torvalds 已提交
742 743
	struct sock *sk = sock->sk;
	struct hci_dev *hdev = NULL;
744
	int len, err = 0;
L
Linus Torvalds 已提交
745 746 747

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

748 749 750 751 752 753 754 755 756 757
	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;

L
Linus Torvalds 已提交
758 759
	lock_sock(sk);

760
	if (sk->sk_state == BT_BOUND) {
L
Linus Torvalds 已提交
761 762 763 764
		err = -EALREADY;
		goto done;
	}

765 766 767 768
	switch (haddr.hci_channel) {
	case HCI_CHANNEL_RAW:
		if (hci_pi(sk)->hdev) {
			err = -EALREADY;
L
Linus Torvalds 已提交
769 770 771
			goto done;
		}

772 773 774 775 776 777 778 779 780 781 782 783 784
		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;

785 786 787 788 789 790 791 792 793 794 795
	case HCI_CHANNEL_USER:
		if (hci_pi(sk)->hdev) {
			err = -EALREADY;
			goto done;
		}

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

796
		if (!capable(CAP_NET_ADMIN)) {
797 798 799 800 801 802 803 804 805 806
			err = -EPERM;
			goto done;
		}

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

807
		if (test_bit(HCI_INIT, &hdev->flags) ||
808
		    hci_dev_test_flag(hdev, HCI_SETUP) ||
809 810 811
		    hci_dev_test_flag(hdev, HCI_CONFIG) ||
		    (!hci_dev_test_flag(hdev, HCI_AUTO_OFF) &&
		     test_bit(HCI_UP, &hdev->flags))) {
812 813 814 815 816
			err = -EBUSY;
			hci_dev_put(hdev);
			goto done;
		}

817
		if (hci_dev_test_and_set_flag(hdev, HCI_USER_CHANNEL)) {
818 819 820 821 822
			err = -EUSERS;
			hci_dev_put(hdev);
			goto done;
		}

823
		mgmt_index_removed(hdev);
824 825 826

		err = hci_dev_open(hdev->id);
		if (err) {
827 828 829 830 831 832 833 834 835 836 837 838 839 840 841
			if (err == -EALREADY) {
				/* In case the transport is already up and
				 * running, clear the error here.
				 *
				 * This can happen when opening an user
				 * channel and HCI_AUTO_OFF grace period
				 * is still active.
				 */
				err = 0;
			} else {
				hci_dev_clear_flag(hdev, HCI_USER_CHANNEL);
				mgmt_index_added(hdev);
				hci_dev_put(hdev);
				goto done;
			}
842 843 844 845 846 847 848
		}

		atomic_inc(&hdev->promisc);

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

849 850 851 852 853 854 855 856 857 858 859
	case HCI_CHANNEL_MONITOR:
		if (haddr.hci_dev != HCI_DEV_NONE) {
			err = -EINVAL;
			goto done;
		}

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

860 861 862 863 864
		/* The monitor interface is restricted to CAP_NET_RAW
		 * capabilities and with that implicitly trusted.
		 */
		hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);

865 866 867 868 869
		send_monitor_replay(sk);

		atomic_inc(&monitor_promisc);
		break;

870
	default:
871 872 873 874 875 876 877 878 879 880
		if (!hci_mgmt_chan_find(haddr.hci_channel)) {
			err = -EINVAL;
			goto done;
		}

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

881 882 883 884
		/* Users with CAP_NET_ADMIN capabilities are allowed
		 * access to all management commands and events. For
		 * untrusted users the interface is restricted and
		 * also only untrusted events are sent.
885
		 */
886 887
		if (capable(CAP_NET_ADMIN))
			hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
888

889 890 891 892 893
		/* At the moment the index and unconfigured index events
		 * are enabled unconditionally. Setting them on each
		 * socket when binding keeps this functionality. They
		 * however might be cleared later and then sending of these
		 * events will be disabled, but that is then intentional.
894 895 896 897
		 *
		 * This also enables generic events that are safe to be
		 * received by untrusted users. Example for such events
		 * are changes to settings, class of device, name etc.
898 899 900 901
		 */
		if (haddr.hci_channel == HCI_CHANNEL_CONTROL) {
			hci_sock_set_flag(sk, HCI_MGMT_INDEX_EVENTS);
			hci_sock_set_flag(sk, HCI_MGMT_UNCONF_INDEX_EVENTS);
902
			hci_sock_set_flag(sk, HCI_MGMT_GENERIC_EVENTS);
903
		}
904
		break;
L
Linus Torvalds 已提交
905 906
	}

907

908
	hci_pi(sk)->channel = haddr.hci_channel;
L
Linus Torvalds 已提交
909 910 911 912 913 914 915
	sk->sk_state = BT_BOUND;

done:
	release_sock(sk);
	return err;
}

916 917
static int hci_sock_getname(struct socket *sock, struct sockaddr *addr,
			    int *addr_len, int peer)
L
Linus Torvalds 已提交
918 919 920
{
	struct sockaddr_hci *haddr = (struct sockaddr_hci *) addr;
	struct sock *sk = sock->sk;
921 922
	struct hci_dev *hdev;
	int err = 0;
L
Linus Torvalds 已提交
923 924 925

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

926 927 928
	if (peer)
		return -EOPNOTSUPP;

L
Linus Torvalds 已提交
929 930
	lock_sock(sk);

931 932 933 934 935 936
	hdev = hci_pi(sk)->hdev;
	if (!hdev) {
		err = -EBADFD;
		goto done;
	}

L
Linus Torvalds 已提交
937 938
	*addr_len = sizeof(*haddr);
	haddr->hci_family = AF_BLUETOOTH;
939
	haddr->hci_dev    = hdev->id;
940
	haddr->hci_channel= hci_pi(sk)->channel;
L
Linus Torvalds 已提交
941

942
done:
L
Linus Torvalds 已提交
943
	release_sock(sk);
944
	return err;
L
Linus Torvalds 已提交
945 946
}

947 948
static void hci_sock_cmsg(struct sock *sk, struct msghdr *msg,
			  struct sk_buff *skb)
L
Linus Torvalds 已提交
949 950 951
{
	__u32 mask = hci_pi(sk)->cmsg_mask;

952 953
	if (mask & HCI_CMSG_DIR) {
		int incoming = bt_cb(skb)->incoming;
954 955
		put_cmsg(msg, SOL_HCI, HCI_CMSG_DIR, sizeof(incoming),
			 &incoming);
956
	}
L
Linus Torvalds 已提交
957

958
	if (mask & HCI_CMSG_TSTAMP) {
959 960 961
#ifdef CONFIG_COMPAT
		struct compat_timeval ctv;
#endif
962
		struct timeval tv;
963 964
		void *data;
		int len;
965 966

		skb_get_timestamp(skb, &tv);
967

968 969 970
		data = &tv;
		len = sizeof(tv);
#ifdef CONFIG_COMPAT
971 972
		if (!COMPAT_USE_64BIT_TIME &&
		    (msg->msg_flags & MSG_CMSG_COMPAT)) {
973 974 975 976 977
			ctv.tv_sec = tv.tv_sec;
			ctv.tv_usec = tv.tv_usec;
			data = &ctv;
			len = sizeof(ctv);
		}
978
#endif
979 980

		put_cmsg(msg, SOL_HCI, HCI_CMSG_TSTAMP, len, data);
981
	}
L
Linus Torvalds 已提交
982
}
983

984 985
static int hci_sock_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
			    int flags)
L
Linus Torvalds 已提交
986 987 988 989 990 991 992 993 994 995 996 997 998 999
{
	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
Andrei Emeltchenko 已提交
1000 1001
	skb = skb_recv_datagram(sk, flags, noblock, &err);
	if (!skb)
L
Linus Torvalds 已提交
1002 1003 1004 1005 1006 1007 1008 1009
		return err;

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

1010
	skb_reset_transport_header(skb);
1011
	err = skb_copy_datagram_msg(skb, 0, msg, copied);
L
Linus Torvalds 已提交
1012

1013 1014 1015 1016
	switch (hci_pi(sk)->channel) {
	case HCI_CHANNEL_RAW:
		hci_sock_cmsg(sk, msg, skb);
		break;
1017
	case HCI_CHANNEL_USER:
1018 1019 1020
	case HCI_CHANNEL_MONITOR:
		sock_recv_timestamp(msg, sk, skb);
		break;
1021 1022 1023 1024
	default:
		if (hci_mgmt_chan_find(hci_pi(sk)->channel))
			sock_recv_timestamp(msg, sk, skb);
		break;
1025
	}
L
Linus Torvalds 已提交
1026 1027 1028 1029 1030 1031

	skb_free_datagram(sk, skb);

	return err ? : copied;
}

1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142
static int hci_mgmt_cmd(struct hci_mgmt_chan *chan, struct sock *sk,
			struct msghdr *msg, size_t msglen)
{
	void *buf;
	u8 *cp;
	struct mgmt_hdr *hdr;
	u16 opcode, index, len;
	struct hci_dev *hdev = NULL;
	const struct hci_mgmt_handler *handler;
	bool var_len, no_hdev;
	int err;

	BT_DBG("got %zu bytes", msglen);

	if (msglen < sizeof(*hdr))
		return -EINVAL;

	buf = kmalloc(msglen, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	if (memcpy_from_msg(buf, msg, msglen)) {
		err = -EFAULT;
		goto done;
	}

	hdr = buf;
	opcode = __le16_to_cpu(hdr->opcode);
	index = __le16_to_cpu(hdr->index);
	len = __le16_to_cpu(hdr->len);

	if (len != msglen - sizeof(*hdr)) {
		err = -EINVAL;
		goto done;
	}

	if (opcode >= chan->handler_count ||
	    chan->handlers[opcode].func == NULL) {
		BT_DBG("Unknown op %u", opcode);
		err = mgmt_cmd_status(sk, index, opcode,
				      MGMT_STATUS_UNKNOWN_COMMAND);
		goto done;
	}

	handler = &chan->handlers[opcode];

	if (!hci_sock_test_flag(sk, HCI_SOCK_TRUSTED) &&
	    !(handler->flags & HCI_MGMT_UNTRUSTED)) {
		err = mgmt_cmd_status(sk, index, opcode,
				      MGMT_STATUS_PERMISSION_DENIED);
		goto done;
	}

	if (index != MGMT_INDEX_NONE) {
		hdev = hci_dev_get(index);
		if (!hdev) {
			err = mgmt_cmd_status(sk, index, opcode,
					      MGMT_STATUS_INVALID_INDEX);
			goto done;
		}

		if (hci_dev_test_flag(hdev, HCI_SETUP) ||
		    hci_dev_test_flag(hdev, HCI_CONFIG) ||
		    hci_dev_test_flag(hdev, HCI_USER_CHANNEL)) {
			err = mgmt_cmd_status(sk, index, opcode,
					      MGMT_STATUS_INVALID_INDEX);
			goto done;
		}

		if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED) &&
		    !(handler->flags & HCI_MGMT_UNCONFIGURED)) {
			err = mgmt_cmd_status(sk, index, opcode,
					      MGMT_STATUS_INVALID_INDEX);
			goto done;
		}
	}

	no_hdev = (handler->flags & HCI_MGMT_NO_HDEV);
	if (no_hdev != !hdev) {
		err = mgmt_cmd_status(sk, index, opcode,
				      MGMT_STATUS_INVALID_INDEX);
		goto done;
	}

	var_len = (handler->flags & HCI_MGMT_VAR_LEN);
	if ((var_len && len < handler->data_len) ||
	    (!var_len && len != handler->data_len)) {
		err = mgmt_cmd_status(sk, index, opcode,
				      MGMT_STATUS_INVALID_PARAMS);
		goto done;
	}

	if (hdev && chan->hdev_init)
		chan->hdev_init(sk, hdev);

	cp = buf + sizeof(*hdr);

	err = handler->func(sk, hdev, cp, len);
	if (err < 0)
		goto done;

	err = msglen;

done:
	if (hdev)
		hci_dev_put(hdev);

	kfree(buf);
	return err;
}

1143 1144
static int hci_sock_sendmsg(struct socket *sock, struct msghdr *msg,
			    size_t len)
L
Linus Torvalds 已提交
1145 1146
{
	struct sock *sk = sock->sk;
1147
	struct hci_mgmt_chan *chan;
L
Linus Torvalds 已提交
1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164
	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);

1165 1166
	switch (hci_pi(sk)->channel) {
	case HCI_CHANNEL_RAW:
1167
	case HCI_CHANNEL_USER:
1168
		break;
1169 1170 1171
	case HCI_CHANNEL_MONITOR:
		err = -EOPNOTSUPP;
		goto done;
1172
	default:
1173 1174 1175
		mutex_lock(&mgmt_chan_list_lock);
		chan = __hci_mgmt_chan_find(hci_pi(sk)->channel);
		if (chan)
1176
			err = hci_mgmt_cmd(chan, sk, msg, len);
1177 1178 1179 1180
		else
			err = -EINVAL;

		mutex_unlock(&mgmt_chan_list_lock);
1181 1182 1183
		goto done;
	}

A
Andrei Emeltchenko 已提交
1184 1185
	hdev = hci_pi(sk)->hdev;
	if (!hdev) {
L
Linus Torvalds 已提交
1186 1187 1188 1189
		err = -EBADFD;
		goto done;
	}

1190 1191 1192 1193 1194
	if (!test_bit(HCI_UP, &hdev->flags)) {
		err = -ENETDOWN;
		goto done;
	}

A
Andrei Emeltchenko 已提交
1195 1196
	skb = bt_skb_send_alloc(sk, len, msg->msg_flags & MSG_DONTWAIT, &err);
	if (!skb)
L
Linus Torvalds 已提交
1197 1198
		goto done;

A
Al Viro 已提交
1199
	if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
L
Linus Torvalds 已提交
1200 1201 1202 1203
		err = -EFAULT;
		goto drop;
	}

1204
	bt_cb(skb)->pkt_type = *((unsigned char *) skb->data);
L
Linus Torvalds 已提交
1205 1206
	skb_pull(skb, 1);

1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222
	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) {
1223
		u16 opcode = get_unaligned_le16(skb->data);
L
Linus Torvalds 已提交
1224 1225 1226 1227
		u16 ogf = hci_opcode_ogf(opcode);
		u16 ocf = hci_opcode_ocf(opcode);

		if (((ogf > HCI_SFLT_MAX_OGF) ||
1228 1229 1230
		     !hci_test_bit(ocf & HCI_FLT_OCF_BITS,
				   &hci_sec_filter.ocf_mask[ogf])) &&
		    !capable(CAP_NET_RAW)) {
L
Linus Torvalds 已提交
1231 1232 1233 1234
			err = -EPERM;
			goto drop;
		}

1235
		if (ogf == 0x3f) {
L
Linus Torvalds 已提交
1236
			skb_queue_tail(&hdev->raw_q, skb);
1237
			queue_work(hdev->workqueue, &hdev->tx_work);
L
Linus Torvalds 已提交
1238
		} else {
S
Stephen Hemminger 已提交
1239
			/* Stand-alone HCI commands must be flagged as
1240 1241
			 * single-command requests.
			 */
1242
			bt_cb(skb)->req.start = true;
1243

L
Linus Torvalds 已提交
1244
			skb_queue_tail(&hdev->cmd_q, skb);
1245
			queue_work(hdev->workqueue, &hdev->cmd_work);
L
Linus Torvalds 已提交
1246 1247 1248 1249 1250 1251 1252 1253
		}
	} else {
		if (!capable(CAP_NET_RAW)) {
			err = -EPERM;
			goto drop;
		}

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

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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);

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	if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
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		err = -EBADFD;
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		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:
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		{
			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];
		}
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		break;
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	default:
		err = -ENOPROTOOPT;
		break;
	}

1346
done:
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	release_sock(sk);
	return err;
}

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

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

1363 1364 1365
	lock_sock(sk);

	if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
1366
		err = -EBADFD;
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		goto done;
	}

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	switch (optname) {
	case HCI_DATA_DIR:
		if (hci_pi(sk)->cmsg_mask & HCI_CMSG_DIR)
			opt = 1;
1374
		else
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			opt = 0;

		if (put_user(opt, optval))
1378
			err = -EFAULT;
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		break;

	case HCI_TIME_STAMP:
		if (hci_pi(sk)->cmsg_mask & HCI_CMSG_TSTAMP)
			opt = 1;
1384
		else
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			opt = 0;

		if (put_user(opt, optval))
1388
			err = -EFAULT;
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		break;

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

1395
			memset(&uf, 0, sizeof(uf));
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			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))
1404
			err = -EFAULT;
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		break;

	default:
1408
		err = -ENOPROTOOPT;
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		break;
	}

1412 1413 1414
done:
	release_sock(sk);
	return err;
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}

1417
static const struct proto_ops hci_sock_ops = {
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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)
};

1443 1444
static int hci_sock_create(struct net *net, struct socket *sock, int protocol,
			   int kern)
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{
	struct sock *sk;

	BT_DBG("sock %p", sock);

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

	sock->ops = &hci_sock_ops;

1455
	sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &hci_sk_proto, kern);
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	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;
}

1472
static const struct net_proto_family hci_sock_family_ops = {
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	.family	= PF_BLUETOOTH,
	.owner	= THIS_MODULE,
	.create	= hci_sock_create,
};

int __init hci_sock_init(void)
{
	int err;

1482 1483
	BUILD_BUG_ON(sizeof(struct sockaddr_hci) > sizeof(struct sockaddr));

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

	err = bt_sock_register(BTPROTO_HCI, &hci_sock_family_ops);
1489 1490
	if (err < 0) {
		BT_ERR("HCI socket registration failed");
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		goto error;
1492 1493
	}

1494
	err = bt_procfs_init(&init_net, "hci", &hci_sk_list, NULL);
1495 1496 1497 1498 1499
	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;
}

1510
void hci_sock_cleanup(void)
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{
1512
	bt_procfs_cleanup(&init_net, "hci");
1513
	bt_sock_unregister(BTPROTO_HCI);
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	proto_unregister(&hci_sk_proto);
}