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hci_sock.c
2066 lines (1646 loc) · 44.4 KB
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hci_sock.c
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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
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
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
SOFTWARE IS DISCLAIMED.
*/
/* Bluetooth HCI sockets. */
#include <linux/export.h>
#include <linux/utsname.h>
#include <linux/sched.h>
#include <asm/unaligned.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#include <net/bluetooth/hci_mon.h>
#include <net/bluetooth/mgmt.h>
#include "mgmt_util.h"
static LIST_HEAD(mgmt_chan_list);
static DEFINE_MUTEX(mgmt_chan_list_lock);
static DEFINE_IDA(sock_cookie_ida);
static atomic_t monitor_promisc = ATOMIC_INIT(0);
/* ----- HCI socket interface ----- */
/* 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;
unsigned long flags;
__u32 cookie;
char comm[TASK_COMM_LEN];
};
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);
}
int hci_sock_test_flag(struct sock *sk, int nr)
{
return test_bit(nr, &hci_pi(sk)->flags);
}
unsigned short hci_sock_get_channel(struct sock *sk)
{
return hci_pi(sk)->channel;
}
u32 hci_sock_get_cookie(struct sock *sk)
{
return hci_pi(sk)->cookie;
}
static bool hci_sock_gen_cookie(struct sock *sk)
{
int id = hci_pi(sk)->cookie;
if (!id) {
id = ida_simple_get(&sock_cookie_ida, 1, 0, GFP_KERNEL);
if (id < 0)
id = 0xffffffff;
hci_pi(sk)->cookie = id;
get_task_comm(hci_pi(sk)->comm, current);
return true;
}
return false;
}
static void hci_sock_free_cookie(struct sock *sk)
{
int id = hci_pi(sk)->cookie;
if (id) {
hci_pi(sk)->cookie = 0xffffffff;
ida_simple_remove(&sock_cookie_ida, id);
}
}
static inline int hci_test_bit(int nr, const void *addr)
{
return *((const __u32 *) addr + (nr >> 5)) & ((__u32) 1 << (nr & 31));
}
/* Security filter */
#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];
};
static const struct hci_sec_filter hci_sec_filter = {
/* Packet types */
0x10,
/* Events */
{ 0x1000d9fe, 0x0000b00c },
/* Commands */
{
{ 0x0 },
/* OGF_LINK_CTL */
{ 0xbe000006, 0x00000001, 0x00000000, 0x00 },
/* OGF_LINK_POLICY */
{ 0x00005200, 0x00000000, 0x00000000, 0x00 },
/* OGF_HOST_CTL */
{ 0xaab00200, 0x2b402aaa, 0x05220154, 0x00 },
/* OGF_INFO_PARAM */
{ 0x000002be, 0x00000000, 0x00000000, 0x00 },
/* OGF_STATUS_PARAM */
{ 0x000000ea, 0x00000000, 0x00000000, 0x00 }
}
};
static struct bt_sock_list hci_sk_list = {
.lock = __RW_LOCK_UNLOCKED(hci_sk_list.lock)
};
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;
flt_type = hci_skb_pkt_type(skb) & HCI_FLT_TYPE_BITS;
if (!test_bit(flt_type, &flt->type_mask))
return true;
/* Extra filter for event packets only */
if (hci_skb_pkt_type(skb) != 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;
}
/* Send frame to RAW socket */
void hci_send_to_sock(struct hci_dev *hdev, struct sk_buff *skb)
{
struct sock *sk;
struct sk_buff *skb_copy = NULL;
BT_DBG("hdev %p len %d", hdev, skb->len);
read_lock(&hci_sk_list.lock);
sk_for_each(sk, &hci_sk_list.head) {
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;
if (hci_pi(sk)->channel == HCI_CHANNEL_RAW) {
if (hci_skb_pkt_type(skb) != HCI_COMMAND_PKT &&
hci_skb_pkt_type(skb) != HCI_EVENT_PKT &&
hci_skb_pkt_type(skb) != HCI_ACLDATA_PKT &&
hci_skb_pkt_type(skb) != HCI_SCODATA_PKT)
continue;
if (is_filtered_packet(sk, skb))
continue;
} else if (hci_pi(sk)->channel == HCI_CHANNEL_USER) {
if (!bt_cb(skb)->incoming)
continue;
if (hci_skb_pkt_type(skb) != HCI_EVENT_PKT &&
hci_skb_pkt_type(skb) != HCI_ACLDATA_PKT &&
hci_skb_pkt_type(skb) != HCI_SCODATA_PKT)
continue;
} else {
/* Don't send frame to other channel types */
continue;
}
if (!skb_copy) {
/* Create a private copy with headroom */
skb_copy = __pskb_copy_fclone(skb, 1, GFP_ATOMIC, true);
if (!skb_copy)
continue;
/* Put type byte before the data */
memcpy(skb_push(skb_copy, 1), &hci_skb_pkt_type(skb), 1);
}
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);
}
/* Send frame to sockets with specific channel */
static void __hci_send_to_channel(unsigned short channel, struct sk_buff *skb,
int flag, struct sock *skip_sk)
{
struct sock *sk;
BT_DBG("channel %u len %d", channel, skb->len);
sk_for_each(sk, &hci_sk_list.head) {
struct sk_buff *nskb;
/* Ignore socket without the flag set */
if (!hci_sock_test_flag(sk, flag))
continue;
/* Skip the original socket */
if (sk == skip_sk)
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);
}
}
void hci_send_to_channel(unsigned short channel, struct sk_buff *skb,
int flag, struct sock *skip_sk)
{
read_lock(&hci_sk_list.lock);
__hci_send_to_channel(channel, skb, flag, skip_sk);
read_unlock(&hci_sk_list.lock);
}
/* Send frame to monitor socket */
void hci_send_to_monitor(struct hci_dev *hdev, struct sk_buff *skb)
{
struct sk_buff *skb_copy = NULL;
struct hci_mon_hdr *hdr;
__le16 opcode;
if (!atomic_read(&monitor_promisc))
return;
BT_DBG("hdev %p len %d", hdev, skb->len);
switch (hci_skb_pkt_type(skb)) {
case HCI_COMMAND_PKT:
opcode = cpu_to_le16(HCI_MON_COMMAND_PKT);
break;
case HCI_EVENT_PKT:
opcode = cpu_to_le16(HCI_MON_EVENT_PKT);
break;
case HCI_ACLDATA_PKT:
if (bt_cb(skb)->incoming)
opcode = cpu_to_le16(HCI_MON_ACL_RX_PKT);
else
opcode = cpu_to_le16(HCI_MON_ACL_TX_PKT);
break;
case HCI_SCODATA_PKT:
if (bt_cb(skb)->incoming)
opcode = cpu_to_le16(HCI_MON_SCO_RX_PKT);
else
opcode = cpu_to_le16(HCI_MON_SCO_TX_PKT);
break;
case HCI_DIAG_PKT:
opcode = cpu_to_le16(HCI_MON_VENDOR_DIAG);
break;
default:
return;
}
/* 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 = 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);
hci_send_to_channel(HCI_CHANNEL_MONITOR, skb_copy,
HCI_SOCK_TRUSTED, NULL);
kfree_skb(skb_copy);
}
void hci_send_monitor_ctrl_event(struct hci_dev *hdev, u16 event,
void *data, u16 data_len, ktime_t tstamp,
int flag, struct sock *skip_sk)
{
struct sock *sk;
__le16 index;
if (hdev)
index = cpu_to_le16(hdev->id);
else
index = cpu_to_le16(MGMT_INDEX_NONE);
read_lock(&hci_sk_list.lock);
sk_for_each(sk, &hci_sk_list.head) {
struct hci_mon_hdr *hdr;
struct sk_buff *skb;
if (hci_pi(sk)->channel != HCI_CHANNEL_CONTROL)
continue;
/* Ignore socket without the flag set */
if (!hci_sock_test_flag(sk, flag))
continue;
/* Skip the original socket */
if (sk == skip_sk)
continue;
skb = bt_skb_alloc(6 + data_len, GFP_ATOMIC);
if (!skb)
continue;
put_unaligned_le32(hci_pi(sk)->cookie, skb_put(skb, 4));
put_unaligned_le16(event, skb_put(skb, 2));
if (data)
skb_put_data(skb, data, data_len);
skb->tstamp = tstamp;
hdr = skb_push(skb, HCI_MON_HDR_SIZE);
hdr->opcode = cpu_to_le16(HCI_MON_CTRL_EVENT);
hdr->index = index;
hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
__hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
HCI_SOCK_TRUSTED, NULL);
kfree_skb(skb);
}
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 hci_mon_index_info *ii;
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 = 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 = cpu_to_le16(HCI_MON_NEW_INDEX);
break;
case HCI_DEV_UNREG:
skb = bt_skb_alloc(0, GFP_ATOMIC);
if (!skb)
return NULL;
opcode = cpu_to_le16(HCI_MON_DEL_INDEX);
break;
case HCI_DEV_SETUP:
if (hdev->manufacturer == 0xffff)
return NULL;
/* fall through */
case HCI_DEV_UP:
skb = bt_skb_alloc(HCI_MON_INDEX_INFO_SIZE, GFP_ATOMIC);
if (!skb)
return NULL;
ii = 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;
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;
default:
return NULL;
}
__net_timestamp(skb);
hdr = 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 struct sk_buff *create_monitor_ctrl_open(struct sock *sk)
{
struct hci_mon_hdr *hdr;
struct sk_buff *skb;
u16 format;
u8 ver[3];
u32 flags;
/* No message needed when cookie is not present */
if (!hci_pi(sk)->cookie)
return NULL;
switch (hci_pi(sk)->channel) {
case HCI_CHANNEL_RAW:
format = 0x0000;
ver[0] = BT_SUBSYS_VERSION;
put_unaligned_le16(BT_SUBSYS_REVISION, ver + 1);
break;
case HCI_CHANNEL_USER:
format = 0x0001;
ver[0] = BT_SUBSYS_VERSION;
put_unaligned_le16(BT_SUBSYS_REVISION, ver + 1);
break;
case HCI_CHANNEL_CONTROL:
format = 0x0002;
mgmt_fill_version_info(ver);
break;
default:
/* No message for unsupported format */
return NULL;
}
skb = bt_skb_alloc(14 + TASK_COMM_LEN , GFP_ATOMIC);
if (!skb)
return NULL;
flags = hci_sock_test_flag(sk, HCI_SOCK_TRUSTED) ? 0x1 : 0x0;
put_unaligned_le32(hci_pi(sk)->cookie, skb_put(skb, 4));
put_unaligned_le16(format, skb_put(skb, 2));
skb_put_data(skb, ver, sizeof(ver));
put_unaligned_le32(flags, skb_put(skb, 4));
skb_put_u8(skb, TASK_COMM_LEN);
skb_put_data(skb, hci_pi(sk)->comm, TASK_COMM_LEN);
__net_timestamp(skb);
hdr = skb_push(skb, HCI_MON_HDR_SIZE);
hdr->opcode = cpu_to_le16(HCI_MON_CTRL_OPEN);
if (hci_pi(sk)->hdev)
hdr->index = cpu_to_le16(hci_pi(sk)->hdev->id);
else
hdr->index = cpu_to_le16(HCI_DEV_NONE);
hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
return skb;
}
static struct sk_buff *create_monitor_ctrl_close(struct sock *sk)
{
struct hci_mon_hdr *hdr;
struct sk_buff *skb;
/* No message needed when cookie is not present */
if (!hci_pi(sk)->cookie)
return NULL;
switch (hci_pi(sk)->channel) {
case HCI_CHANNEL_RAW:
case HCI_CHANNEL_USER:
case HCI_CHANNEL_CONTROL:
break;
default:
/* No message for unsupported format */
return NULL;
}
skb = bt_skb_alloc(4, GFP_ATOMIC);
if (!skb)
return NULL;
put_unaligned_le32(hci_pi(sk)->cookie, skb_put(skb, 4));
__net_timestamp(skb);
hdr = skb_push(skb, HCI_MON_HDR_SIZE);
hdr->opcode = cpu_to_le16(HCI_MON_CTRL_CLOSE);
if (hci_pi(sk)->hdev)
hdr->index = cpu_to_le16(hci_pi(sk)->hdev->id);
else
hdr->index = cpu_to_le16(HCI_DEV_NONE);
hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
return skb;
}
static struct sk_buff *create_monitor_ctrl_command(struct sock *sk, u16 index,
u16 opcode, u16 len,
const void *buf)
{
struct hci_mon_hdr *hdr;
struct sk_buff *skb;
skb = bt_skb_alloc(6 + len, GFP_ATOMIC);
if (!skb)
return NULL;
put_unaligned_le32(hci_pi(sk)->cookie, skb_put(skb, 4));
put_unaligned_le16(opcode, skb_put(skb, 2));
if (buf)
skb_put_data(skb, buf, len);
__net_timestamp(skb);
hdr = skb_push(skb, HCI_MON_HDR_SIZE);
hdr->opcode = cpu_to_le16(HCI_MON_CTRL_COMMAND);
hdr->index = cpu_to_le16(index);
hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
return skb;
}
static void __printf(2, 3)
send_monitor_note(struct sock *sk, const char *fmt, ...)
{
size_t len;
struct hci_mon_hdr *hdr;
struct sk_buff *skb;
va_list args;
va_start(args, fmt);
len = vsnprintf(NULL, 0, fmt, args);
va_end(args);
skb = bt_skb_alloc(len + 1, GFP_ATOMIC);
if (!skb)
return;
va_start(args, fmt);
vsprintf(skb_put(skb, len), fmt, args);
*(u8 *)skb_put(skb, 1) = 0;
va_end(args);
__net_timestamp(skb);
hdr = (void *)skb_push(skb, HCI_MON_HDR_SIZE);
hdr->opcode = cpu_to_le16(HCI_MON_SYSTEM_NOTE);
hdr->index = cpu_to_le16(HCI_DEV_NONE);
hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
if (sock_queue_rcv_skb(sk, skb))
kfree_skb(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);
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);
if (test_bit(HCI_UP, &hdev->flags))
skb = create_monitor_event(hdev, HCI_DEV_UP);
else if (hci_dev_test_flag(hdev, HCI_SETUP))
skb = create_monitor_event(hdev, HCI_DEV_SETUP);
else
skb = NULL;
if (skb) {
if (sock_queue_rcv_skb(sk, skb))
kfree_skb(skb);
}
}
read_unlock(&hci_dev_list_lock);
}
static void send_monitor_control_replay(struct sock *mon_sk)
{
struct sock *sk;
read_lock(&hci_sk_list.lock);
sk_for_each(sk, &hci_sk_list.head) {
struct sk_buff *skb;
skb = create_monitor_ctrl_open(sk);
if (!skb)
continue;
if (sock_queue_rcv_skb(mon_sk, skb))
kfree_skb(skb);
}
read_unlock(&hci_sk_list.lock);
}
/* 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 = skb_put(skb, HCI_EVENT_HDR_SIZE);
hdr->evt = HCI_EV_STACK_INTERNAL;
hdr->plen = sizeof(*ev) + dlen;
ev = skb_put(skb, sizeof(*ev) + dlen);
ev->type = type;
memcpy(ev->data, data, dlen);
bt_cb(skb)->incoming = 1;
__net_timestamp(skb);
hci_skb_pkt_type(skb) = 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);
if (atomic_read(&monitor_promisc)) {
struct sk_buff *skb;
/* Send event to monitor */
skb = create_monitor_event(hdev, event);
if (skb) {
hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
HCI_SOCK_TRUSTED, NULL);
kfree_skb(skb);
}
}
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);
}
if (event == HCI_DEV_UNREG) {
struct sock *sk;
/* Detach sockets from device */
read_lock(&hci_sk_list.lock);
sk_for_each(sk, &hci_sk_list.head) {
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);
}
}
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);
static int hci_sock_release(struct socket *sock)
{
struct sock *sk = sock->sk;
struct hci_dev *hdev;
struct sk_buff *skb;
BT_DBG("sock %p sk %p", sock, sk);
if (!sk)
return 0;
switch (hci_pi(sk)->channel) {
case HCI_CHANNEL_MONITOR:
atomic_dec(&monitor_promisc);
break;
case HCI_CHANNEL_RAW:
case HCI_CHANNEL_USER:
case HCI_CHANNEL_CONTROL:
/* Send event to monitor */
skb = create_monitor_ctrl_close(sk);
if (skb) {
hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
HCI_SOCK_TRUSTED, NULL);
kfree_skb(skb);
}
hci_sock_free_cookie(sk);
break;
}
bt_sock_unlink(&hci_sk_list, sk);
hdev = hci_pi(sk)->hdev;
if (hdev) {
if (hci_pi(sk)->channel == HCI_CHANNEL_USER) {
/* When releasing a 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);
hci_dev_clear_flag(hdev, HCI_USER_CHANNEL);
mgmt_index_added(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;
}
static int hci_sock_blacklist_add(struct hci_dev *hdev, void __user *arg)
{
bdaddr_t bdaddr;
int err;
if (copy_from_user(&bdaddr, arg, sizeof(bdaddr)))
return -EFAULT;
hci_dev_lock(hdev);
err = hci_bdaddr_list_add(&hdev->blacklist, &bdaddr, BDADDR_BREDR);
hci_dev_unlock(hdev);
return err;
}
static int hci_sock_blacklist_del(struct hci_dev *hdev, void __user *arg)
{
bdaddr_t bdaddr;
int err;
if (copy_from_user(&bdaddr, arg, sizeof(bdaddr)))
return -EFAULT;
hci_dev_lock(hdev);
err = hci_bdaddr_list_del(&hdev->blacklist, &bdaddr, BDADDR_BREDR);
hci_dev_unlock(hdev);
return err;
}
/* Ioctls that require bound socket */
static int hci_sock_bound_ioctl(struct sock *sk, unsigned int cmd,
unsigned long arg)
{
struct hci_dev *hdev = hci_pi(sk)->hdev;
if (!hdev)
return -EBADFD;
if (hci_dev_test_flag(hdev, HCI_USER_CHANNEL))
return -EBUSY;
if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED))
return -EOPNOTSUPP;
if (hdev->dev_type != HCI_PRIMARY)
return -EOPNOTSUPP;
switch (cmd) {
case HCISETRAW:
if (!capable(CAP_NET_ADMIN))
return -EPERM;
return -EOPNOTSUPP;
case HCIGETCONNINFO:
return hci_get_conn_info(hdev, (void __user *)arg);
case HCIGETAUTHINFO:
return hci_get_auth_info(hdev, (void __user *)arg);
case HCIBLOCKADDR:
if (!capable(CAP_NET_ADMIN))
return -EPERM;
return hci_sock_blacklist_add(hdev, (void __user *)arg);
case HCIUNBLOCKADDR:
if (!capable(CAP_NET_ADMIN))
return -EPERM;
return hci_sock_blacklist_del(hdev, (void __user *)arg);
}
return -ENOIOCTLCMD;
}
static int hci_sock_ioctl(struct socket *sock, unsigned int cmd,
unsigned long arg)
{
void __user *argp = (void __user *)arg;
struct sock *sk = sock->sk;
int err;
BT_DBG("cmd %x arg %lx", cmd, arg);
lock_sock(sk);
if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
err = -EBADFD;
goto done;
}
/* When calling an ioctl on an unbound raw socket, then ensure
* that the monitor gets informed. Ensure that the resulting event
* is only send once by checking if the cookie exists or not. The
* socket cookie will be only ever generated once for the lifetime
* of a given socket.
*/
if (hci_sock_gen_cookie(sk)) {
struct sk_buff *skb;
if (capable(CAP_NET_ADMIN))
hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
/* Send event to monitor */
skb = create_monitor_ctrl_open(sk);
if (skb) {
hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
HCI_SOCK_TRUSTED, NULL);
kfree_skb(skb);
}
}
release_sock(sk);