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hci_core.c
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hci_core.c
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/*
BlueZ - Bluetooth protocol stack for Linux
Copyright (C) 2000-2001 Qualcomm Incorporated
Copyright (C) 2011 ProFUSION Embedded Systems
Written 2000,2001 by Maxim Krasnyansky <[email protected]>
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 core. */
#include <linux/export.h>
#include <linux/idr.h>
#include <linux/rfkill.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
static void hci_rx_work(struct work_struct *work);
static void hci_cmd_work(struct work_struct *work);
static void hci_tx_work(struct work_struct *work);
/* HCI device list */
LIST_HEAD(hci_dev_list);
DEFINE_RWLOCK(hci_dev_list_lock);
/* HCI callback list */
LIST_HEAD(hci_cb_list);
DEFINE_RWLOCK(hci_cb_list_lock);
/* HCI ID Numbering */
static DEFINE_IDA(hci_index_ida);
/* ---- HCI notifications ---- */
static void hci_notify(struct hci_dev *hdev, int event)
{
hci_sock_dev_event(hdev, event);
}
/* ---- HCI requests ---- */
static void hci_req_sync_complete(struct hci_dev *hdev, u8 result)
{
BT_DBG("%s result 0x%2.2x", hdev->name, result);
if (hdev->req_status == HCI_REQ_PEND) {
hdev->req_result = result;
hdev->req_status = HCI_REQ_DONE;
wake_up_interruptible(&hdev->req_wait_q);
}
}
static void hci_req_cancel(struct hci_dev *hdev, int err)
{
BT_DBG("%s err 0x%2.2x", hdev->name, err);
if (hdev->req_status == HCI_REQ_PEND) {
hdev->req_result = err;
hdev->req_status = HCI_REQ_CANCELED;
wake_up_interruptible(&hdev->req_wait_q);
}
}
static struct sk_buff *hci_get_cmd_complete(struct hci_dev *hdev, u16 opcode,
u8 event)
{
struct hci_ev_cmd_complete *ev;
struct hci_event_hdr *hdr;
struct sk_buff *skb;
hci_dev_lock(hdev);
skb = hdev->recv_evt;
hdev->recv_evt = NULL;
hci_dev_unlock(hdev);
if (!skb)
return ERR_PTR(-ENODATA);
if (skb->len < sizeof(*hdr)) {
BT_ERR("Too short HCI event");
goto failed;
}
hdr = (void *) skb->data;
skb_pull(skb, HCI_EVENT_HDR_SIZE);
if (event) {
if (hdr->evt != event)
goto failed;
return skb;
}
if (hdr->evt != HCI_EV_CMD_COMPLETE) {
BT_DBG("Last event is not cmd complete (0x%2.2x)", hdr->evt);
goto failed;
}
if (skb->len < sizeof(*ev)) {
BT_ERR("Too short cmd_complete event");
goto failed;
}
ev = (void *) skb->data;
skb_pull(skb, sizeof(*ev));
if (opcode == __le16_to_cpu(ev->opcode))
return skb;
BT_DBG("opcode doesn't match (0x%2.2x != 0x%2.2x)", opcode,
__le16_to_cpu(ev->opcode));
failed:
kfree_skb(skb);
return ERR_PTR(-ENODATA);
}
struct sk_buff *__hci_cmd_sync_ev(struct hci_dev *hdev, u16 opcode, u32 plen,
const void *param, u8 event, u32 timeout)
{
DECLARE_WAITQUEUE(wait, current);
struct hci_request req;
int err = 0;
BT_DBG("%s", hdev->name);
hci_req_init(&req, hdev);
hci_req_add_ev(&req, opcode, plen, param, event);
hdev->req_status = HCI_REQ_PEND;
err = hci_req_run(&req, hci_req_sync_complete);
if (err < 0)
return ERR_PTR(err);
add_wait_queue(&hdev->req_wait_q, &wait);
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(timeout);
remove_wait_queue(&hdev->req_wait_q, &wait);
if (signal_pending(current))
return ERR_PTR(-EINTR);
switch (hdev->req_status) {
case HCI_REQ_DONE:
err = -bt_to_errno(hdev->req_result);
break;
case HCI_REQ_CANCELED:
err = -hdev->req_result;
break;
default:
err = -ETIMEDOUT;
break;
}
hdev->req_status = hdev->req_result = 0;
BT_DBG("%s end: err %d", hdev->name, err);
if (err < 0)
return ERR_PTR(err);
return hci_get_cmd_complete(hdev, opcode, event);
}
EXPORT_SYMBOL(__hci_cmd_sync_ev);
struct sk_buff *__hci_cmd_sync(struct hci_dev *hdev, u16 opcode, u32 plen,
const void *param, u32 timeout)
{
return __hci_cmd_sync_ev(hdev, opcode, plen, param, 0, timeout);
}
EXPORT_SYMBOL(__hci_cmd_sync);
/* Execute request and wait for completion. */
static int __hci_req_sync(struct hci_dev *hdev,
void (*func)(struct hci_request *req,
unsigned long opt),
unsigned long opt, __u32 timeout)
{
struct hci_request req;
DECLARE_WAITQUEUE(wait, current);
int err = 0;
BT_DBG("%s start", hdev->name);
hci_req_init(&req, hdev);
hdev->req_status = HCI_REQ_PEND;
func(&req, opt);
err = hci_req_run(&req, hci_req_sync_complete);
if (err < 0) {
hdev->req_status = 0;
/* ENODATA means the HCI request command queue is empty.
* This can happen when a request with conditionals doesn't
* trigger any commands to be sent. This is normal behavior
* and should not trigger an error return.
*/
if (err == -ENODATA)
return 0;
return err;
}
add_wait_queue(&hdev->req_wait_q, &wait);
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(timeout);
remove_wait_queue(&hdev->req_wait_q, &wait);
if (signal_pending(current))
return -EINTR;
switch (hdev->req_status) {
case HCI_REQ_DONE:
err = -bt_to_errno(hdev->req_result);
break;
case HCI_REQ_CANCELED:
err = -hdev->req_result;
break;
default:
err = -ETIMEDOUT;
break;
}
hdev->req_status = hdev->req_result = 0;
BT_DBG("%s end: err %d", hdev->name, err);
return err;
}
static int hci_req_sync(struct hci_dev *hdev,
void (*req)(struct hci_request *req,
unsigned long opt),
unsigned long opt, __u32 timeout)
{
int ret;
if (!test_bit(HCI_UP, &hdev->flags))
return -ENETDOWN;
/* Serialize all requests */
hci_req_lock(hdev);
ret = __hci_req_sync(hdev, req, opt, timeout);
hci_req_unlock(hdev);
return ret;
}
static void hci_reset_req(struct hci_request *req, unsigned long opt)
{
BT_DBG("%s %ld", req->hdev->name, opt);
/* Reset device */
set_bit(HCI_RESET, &req->hdev->flags);
hci_req_add(req, HCI_OP_RESET, 0, NULL);
}
static void bredr_init(struct hci_request *req)
{
req->hdev->flow_ctl_mode = HCI_FLOW_CTL_MODE_PACKET_BASED;
/* Read Local Supported Features */
hci_req_add(req, HCI_OP_READ_LOCAL_FEATURES, 0, NULL);
/* Read Local Version */
hci_req_add(req, HCI_OP_READ_LOCAL_VERSION, 0, NULL);
/* Read BD Address */
hci_req_add(req, HCI_OP_READ_BD_ADDR, 0, NULL);
}
static void amp_init(struct hci_request *req)
{
req->hdev->flow_ctl_mode = HCI_FLOW_CTL_MODE_BLOCK_BASED;
/* Read Local Version */
hci_req_add(req, HCI_OP_READ_LOCAL_VERSION, 0, NULL);
/* Read Local AMP Info */
hci_req_add(req, HCI_OP_READ_LOCAL_AMP_INFO, 0, NULL);
/* Read Data Blk size */
hci_req_add(req, HCI_OP_READ_DATA_BLOCK_SIZE, 0, NULL);
}
static void hci_init1_req(struct hci_request *req, unsigned long opt)
{
struct hci_dev *hdev = req->hdev;
BT_DBG("%s %ld", hdev->name, opt);
/* Reset */
if (!test_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks))
hci_reset_req(req, 0);
switch (hdev->dev_type) {
case HCI_BREDR:
bredr_init(req);
break;
case HCI_AMP:
amp_init(req);
break;
default:
BT_ERR("Unknown device type %d", hdev->dev_type);
break;
}
}
static void bredr_setup(struct hci_request *req)
{
struct hci_cp_delete_stored_link_key cp;
__le16 param;
__u8 flt_type;
/* Read Buffer Size (ACL mtu, max pkt, etc.) */
hci_req_add(req, HCI_OP_READ_BUFFER_SIZE, 0, NULL);
/* Read Class of Device */
hci_req_add(req, HCI_OP_READ_CLASS_OF_DEV, 0, NULL);
/* Read Local Name */
hci_req_add(req, HCI_OP_READ_LOCAL_NAME, 0, NULL);
/* Read Voice Setting */
hci_req_add(req, HCI_OP_READ_VOICE_SETTING, 0, NULL);
/* Clear Event Filters */
flt_type = HCI_FLT_CLEAR_ALL;
hci_req_add(req, HCI_OP_SET_EVENT_FLT, 1, &flt_type);
/* Connection accept timeout ~20 secs */
param = __constant_cpu_to_le16(0x7d00);
hci_req_add(req, HCI_OP_WRITE_CA_TIMEOUT, 2, ¶m);
bacpy(&cp.bdaddr, BDADDR_ANY);
cp.delete_all = 0x01;
hci_req_add(req, HCI_OP_DELETE_STORED_LINK_KEY, sizeof(cp), &cp);
/* Read page scan parameters */
if (req->hdev->hci_ver > BLUETOOTH_VER_1_1) {
hci_req_add(req, HCI_OP_READ_PAGE_SCAN_ACTIVITY, 0, NULL);
hci_req_add(req, HCI_OP_READ_PAGE_SCAN_TYPE, 0, NULL);
}
}
static void le_setup(struct hci_request *req)
{
struct hci_dev *hdev = req->hdev;
/* Read LE Buffer Size */
hci_req_add(req, HCI_OP_LE_READ_BUFFER_SIZE, 0, NULL);
/* Read LE Local Supported Features */
hci_req_add(req, HCI_OP_LE_READ_LOCAL_FEATURES, 0, NULL);
/* Read LE Advertising Channel TX Power */
hci_req_add(req, HCI_OP_LE_READ_ADV_TX_POWER, 0, NULL);
/* Read LE White List Size */
hci_req_add(req, HCI_OP_LE_READ_WHITE_LIST_SIZE, 0, NULL);
/* Read LE Supported States */
hci_req_add(req, HCI_OP_LE_READ_SUPPORTED_STATES, 0, NULL);
/* LE-only controllers have LE implicitly enabled */
if (!lmp_bredr_capable(hdev))
set_bit(HCI_LE_ENABLED, &hdev->dev_flags);
}
static u8 hci_get_inquiry_mode(struct hci_dev *hdev)
{
if (lmp_ext_inq_capable(hdev))
return 0x02;
if (lmp_inq_rssi_capable(hdev))
return 0x01;
if (hdev->manufacturer == 11 && hdev->hci_rev == 0x00 &&
hdev->lmp_subver == 0x0757)
return 0x01;
if (hdev->manufacturer == 15) {
if (hdev->hci_rev == 0x03 && hdev->lmp_subver == 0x6963)
return 0x01;
if (hdev->hci_rev == 0x09 && hdev->lmp_subver == 0x6963)
return 0x01;
if (hdev->hci_rev == 0x00 && hdev->lmp_subver == 0x6965)
return 0x01;
}
if (hdev->manufacturer == 31 && hdev->hci_rev == 0x2005 &&
hdev->lmp_subver == 0x1805)
return 0x01;
return 0x00;
}
static void hci_setup_inquiry_mode(struct hci_request *req)
{
u8 mode;
mode = hci_get_inquiry_mode(req->hdev);
hci_req_add(req, HCI_OP_WRITE_INQUIRY_MODE, 1, &mode);
}
static void hci_setup_event_mask(struct hci_request *req)
{
struct hci_dev *hdev = req->hdev;
/* The second byte is 0xff instead of 0x9f (two reserved bits
* disabled) since a Broadcom 1.2 dongle doesn't respond to the
* command otherwise.
*/
u8 events[8] = { 0xff, 0xff, 0xfb, 0xff, 0x00, 0x00, 0x00, 0x00 };
/* CSR 1.1 dongles does not accept any bitfield so don't try to set
* any event mask for pre 1.2 devices.
*/
if (hdev->hci_ver < BLUETOOTH_VER_1_2)
return;
if (lmp_bredr_capable(hdev)) {
events[4] |= 0x01; /* Flow Specification Complete */
events[4] |= 0x02; /* Inquiry Result with RSSI */
events[4] |= 0x04; /* Read Remote Extended Features Complete */
events[5] |= 0x08; /* Synchronous Connection Complete */
events[5] |= 0x10; /* Synchronous Connection Changed */
}
if (lmp_inq_rssi_capable(hdev))
events[4] |= 0x02; /* Inquiry Result with RSSI */
if (lmp_sniffsubr_capable(hdev))
events[5] |= 0x20; /* Sniff Subrating */
if (lmp_pause_enc_capable(hdev))
events[5] |= 0x80; /* Encryption Key Refresh Complete */
if (lmp_ext_inq_capable(hdev))
events[5] |= 0x40; /* Extended Inquiry Result */
if (lmp_no_flush_capable(hdev))
events[7] |= 0x01; /* Enhanced Flush Complete */
if (lmp_lsto_capable(hdev))
events[6] |= 0x80; /* Link Supervision Timeout Changed */
if (lmp_ssp_capable(hdev)) {
events[6] |= 0x01; /* IO Capability Request */
events[6] |= 0x02; /* IO Capability Response */
events[6] |= 0x04; /* User Confirmation Request */
events[6] |= 0x08; /* User Passkey Request */
events[6] |= 0x10; /* Remote OOB Data Request */
events[6] |= 0x20; /* Simple Pairing Complete */
events[7] |= 0x04; /* User Passkey Notification */
events[7] |= 0x08; /* Keypress Notification */
events[7] |= 0x10; /* Remote Host Supported
* Features Notification
*/
}
if (lmp_le_capable(hdev))
events[7] |= 0x20; /* LE Meta-Event */
hci_req_add(req, HCI_OP_SET_EVENT_MASK, sizeof(events), events);
if (lmp_le_capable(hdev)) {
memset(events, 0, sizeof(events));
events[0] = 0x1f;
hci_req_add(req, HCI_OP_LE_SET_EVENT_MASK,
sizeof(events), events);
}
}
static void hci_init2_req(struct hci_request *req, unsigned long opt)
{
struct hci_dev *hdev = req->hdev;
if (lmp_bredr_capable(hdev))
bredr_setup(req);
if (lmp_le_capable(hdev))
le_setup(req);
hci_setup_event_mask(req);
if (hdev->hci_ver > BLUETOOTH_VER_1_1)
hci_req_add(req, HCI_OP_READ_LOCAL_COMMANDS, 0, NULL);
if (lmp_ssp_capable(hdev)) {
if (test_bit(HCI_SSP_ENABLED, &hdev->dev_flags)) {
u8 mode = 0x01;
hci_req_add(req, HCI_OP_WRITE_SSP_MODE,
sizeof(mode), &mode);
} else {
struct hci_cp_write_eir cp;
memset(hdev->eir, 0, sizeof(hdev->eir));
memset(&cp, 0, sizeof(cp));
hci_req_add(req, HCI_OP_WRITE_EIR, sizeof(cp), &cp);
}
}
if (lmp_inq_rssi_capable(hdev))
hci_setup_inquiry_mode(req);
if (lmp_inq_tx_pwr_capable(hdev))
hci_req_add(req, HCI_OP_READ_INQ_RSP_TX_POWER, 0, NULL);
if (lmp_ext_feat_capable(hdev)) {
struct hci_cp_read_local_ext_features cp;
cp.page = 0x01;
hci_req_add(req, HCI_OP_READ_LOCAL_EXT_FEATURES,
sizeof(cp), &cp);
}
if (test_bit(HCI_LINK_SECURITY, &hdev->dev_flags)) {
u8 enable = 1;
hci_req_add(req, HCI_OP_WRITE_AUTH_ENABLE, sizeof(enable),
&enable);
}
}
static void hci_setup_link_policy(struct hci_request *req)
{
struct hci_dev *hdev = req->hdev;
struct hci_cp_write_def_link_policy cp;
u16 link_policy = 0;
if (lmp_rswitch_capable(hdev))
link_policy |= HCI_LP_RSWITCH;
if (lmp_hold_capable(hdev))
link_policy |= HCI_LP_HOLD;
if (lmp_sniff_capable(hdev))
link_policy |= HCI_LP_SNIFF;
if (lmp_park_capable(hdev))
link_policy |= HCI_LP_PARK;
cp.policy = cpu_to_le16(link_policy);
hci_req_add(req, HCI_OP_WRITE_DEF_LINK_POLICY, sizeof(cp), &cp);
}
static void hci_set_le_support(struct hci_request *req)
{
struct hci_dev *hdev = req->hdev;
struct hci_cp_write_le_host_supported cp;
/* LE-only devices do not support explicit enablement */
if (!lmp_bredr_capable(hdev))
return;
memset(&cp, 0, sizeof(cp));
if (test_bit(HCI_LE_ENABLED, &hdev->dev_flags)) {
cp.le = 0x01;
cp.simul = lmp_le_br_capable(hdev);
}
if (cp.le != lmp_host_le_capable(hdev))
hci_req_add(req, HCI_OP_WRITE_LE_HOST_SUPPORTED, sizeof(cp),
&cp);
}
static void hci_init3_req(struct hci_request *req, unsigned long opt)
{
struct hci_dev *hdev = req->hdev;
u8 p;
if (hdev->commands[5] & 0x10)
hci_setup_link_policy(req);
if (lmp_le_capable(hdev)) {
hci_set_le_support(req);
hci_update_ad(req);
}
/* Read features beyond page 1 if available */
for (p = 2; p < HCI_MAX_PAGES && p <= hdev->max_page; p++) {
struct hci_cp_read_local_ext_features cp;
cp.page = p;
hci_req_add(req, HCI_OP_READ_LOCAL_EXT_FEATURES,
sizeof(cp), &cp);
}
}
static int __hci_init(struct hci_dev *hdev)
{
int err;
err = __hci_req_sync(hdev, hci_init1_req, 0, HCI_INIT_TIMEOUT);
if (err < 0)
return err;
/* HCI_BREDR covers both single-mode LE, BR/EDR and dual-mode
* BR/EDR/LE type controllers. AMP controllers only need the
* first stage init.
*/
if (hdev->dev_type != HCI_BREDR)
return 0;
err = __hci_req_sync(hdev, hci_init2_req, 0, HCI_INIT_TIMEOUT);
if (err < 0)
return err;
return __hci_req_sync(hdev, hci_init3_req, 0, HCI_INIT_TIMEOUT);
}
static void hci_scan_req(struct hci_request *req, unsigned long opt)
{
__u8 scan = opt;
BT_DBG("%s %x", req->hdev->name, scan);
/* Inquiry and Page scans */
hci_req_add(req, HCI_OP_WRITE_SCAN_ENABLE, 1, &scan);
}
static void hci_auth_req(struct hci_request *req, unsigned long opt)
{
__u8 auth = opt;
BT_DBG("%s %x", req->hdev->name, auth);
/* Authentication */
hci_req_add(req, HCI_OP_WRITE_AUTH_ENABLE, 1, &auth);
}
static void hci_encrypt_req(struct hci_request *req, unsigned long opt)
{
__u8 encrypt = opt;
BT_DBG("%s %x", req->hdev->name, encrypt);
/* Encryption */
hci_req_add(req, HCI_OP_WRITE_ENCRYPT_MODE, 1, &encrypt);
}
static void hci_linkpol_req(struct hci_request *req, unsigned long opt)
{
__le16 policy = cpu_to_le16(opt);
BT_DBG("%s %x", req->hdev->name, policy);
/* Default link policy */
hci_req_add(req, HCI_OP_WRITE_DEF_LINK_POLICY, 2, &policy);
}
/* Get HCI device by index.
* Device is held on return. */
struct hci_dev *hci_dev_get(int index)
{
struct hci_dev *hdev = NULL, *d;
BT_DBG("%d", index);
if (index < 0)
return NULL;
read_lock(&hci_dev_list_lock);
list_for_each_entry(d, &hci_dev_list, list) {
if (d->id == index) {
hdev = hci_dev_hold(d);
break;
}
}
read_unlock(&hci_dev_list_lock);
return hdev;
}
/* ---- Inquiry support ---- */
bool hci_discovery_active(struct hci_dev *hdev)
{
struct discovery_state *discov = &hdev->discovery;
switch (discov->state) {
case DISCOVERY_FINDING:
case DISCOVERY_RESOLVING:
return true;
default:
return false;
}
}
void hci_discovery_set_state(struct hci_dev *hdev, int state)
{
BT_DBG("%s state %u -> %u", hdev->name, hdev->discovery.state, state);
if (hdev->discovery.state == state)
return;
switch (state) {
case DISCOVERY_STOPPED:
if (hdev->discovery.state != DISCOVERY_STARTING)
mgmt_discovering(hdev, 0);
break;
case DISCOVERY_STARTING:
break;
case DISCOVERY_FINDING:
mgmt_discovering(hdev, 1);
break;
case DISCOVERY_RESOLVING:
break;
case DISCOVERY_STOPPING:
break;
}
hdev->discovery.state = state;
}
static void inquiry_cache_flush(struct hci_dev *hdev)
{
struct discovery_state *cache = &hdev->discovery;
struct inquiry_entry *p, *n;
list_for_each_entry_safe(p, n, &cache->all, all) {
list_del(&p->all);
kfree(p);
}
INIT_LIST_HEAD(&cache->unknown);
INIT_LIST_HEAD(&cache->resolve);
}
struct inquiry_entry *hci_inquiry_cache_lookup(struct hci_dev *hdev,
bdaddr_t *bdaddr)
{
struct discovery_state *cache = &hdev->discovery;
struct inquiry_entry *e;
BT_DBG("cache %p, %pMR", cache, bdaddr);
list_for_each_entry(e, &cache->all, all) {
if (!bacmp(&e->data.bdaddr, bdaddr))
return e;
}
return NULL;
}
struct inquiry_entry *hci_inquiry_cache_lookup_unknown(struct hci_dev *hdev,
bdaddr_t *bdaddr)
{
struct discovery_state *cache = &hdev->discovery;
struct inquiry_entry *e;
BT_DBG("cache %p, %pMR", cache, bdaddr);
list_for_each_entry(e, &cache->unknown, list) {
if (!bacmp(&e->data.bdaddr, bdaddr))
return e;
}
return NULL;
}
struct inquiry_entry *hci_inquiry_cache_lookup_resolve(struct hci_dev *hdev,
bdaddr_t *bdaddr,
int state)
{
struct discovery_state *cache = &hdev->discovery;
struct inquiry_entry *e;
BT_DBG("cache %p bdaddr %pMR state %d", cache, bdaddr, state);
list_for_each_entry(e, &cache->resolve, list) {
if (!bacmp(bdaddr, BDADDR_ANY) && e->name_state == state)
return e;
if (!bacmp(&e->data.bdaddr, bdaddr))
return e;
}
return NULL;
}
void hci_inquiry_cache_update_resolve(struct hci_dev *hdev,
struct inquiry_entry *ie)
{
struct discovery_state *cache = &hdev->discovery;
struct list_head *pos = &cache->resolve;
struct inquiry_entry *p;
list_del(&ie->list);
list_for_each_entry(p, &cache->resolve, list) {
if (p->name_state != NAME_PENDING &&
abs(p->data.rssi) >= abs(ie->data.rssi))
break;
pos = &p->list;
}
list_add(&ie->list, pos);
}
bool hci_inquiry_cache_update(struct hci_dev *hdev, struct inquiry_data *data,
bool name_known, bool *ssp)
{
struct discovery_state *cache = &hdev->discovery;
struct inquiry_entry *ie;
BT_DBG("cache %p, %pMR", cache, &data->bdaddr);
hci_remove_remote_oob_data(hdev, &data->bdaddr);
if (ssp)
*ssp = data->ssp_mode;
ie = hci_inquiry_cache_lookup(hdev, &data->bdaddr);
if (ie) {
if (ie->data.ssp_mode && ssp)
*ssp = true;
if (ie->name_state == NAME_NEEDED &&
data->rssi != ie->data.rssi) {
ie->data.rssi = data->rssi;
hci_inquiry_cache_update_resolve(hdev, ie);
}
goto update;
}
/* Entry not in the cache. Add new one. */
ie = kzalloc(sizeof(struct inquiry_entry), GFP_ATOMIC);
if (!ie)
return false;
list_add(&ie->all, &cache->all);
if (name_known) {
ie->name_state = NAME_KNOWN;
} else {
ie->name_state = NAME_NOT_KNOWN;
list_add(&ie->list, &cache->unknown);
}
update:
if (name_known && ie->name_state != NAME_KNOWN &&
ie->name_state != NAME_PENDING) {
ie->name_state = NAME_KNOWN;
list_del(&ie->list);
}
memcpy(&ie->data, data, sizeof(*data));
ie->timestamp = jiffies;
cache->timestamp = jiffies;
if (ie->name_state == NAME_NOT_KNOWN)
return false;
return true;
}
static int inquiry_cache_dump(struct hci_dev *hdev, int num, __u8 *buf)
{
struct discovery_state *cache = &hdev->discovery;
struct inquiry_info *info = (struct inquiry_info *) buf;
struct inquiry_entry *e;
int copied = 0;
list_for_each_entry(e, &cache->all, all) {
struct inquiry_data *data = &e->data;
if (copied >= num)
break;
bacpy(&info->bdaddr, &data->bdaddr);
info->pscan_rep_mode = data->pscan_rep_mode;
info->pscan_period_mode = data->pscan_period_mode;
info->pscan_mode = data->pscan_mode;
memcpy(info->dev_class, data->dev_class, 3);
info->clock_offset = data->clock_offset;
info++;
copied++;
}
BT_DBG("cache %p, copied %d", cache, copied);
return copied;
}
static void hci_inq_req(struct hci_request *req, unsigned long opt)
{
struct hci_inquiry_req *ir = (struct hci_inquiry_req *) opt;
struct hci_dev *hdev = req->hdev;
struct hci_cp_inquiry cp;
BT_DBG("%s", hdev->name);
if (test_bit(HCI_INQUIRY, &hdev->flags))
return;
/* Start Inquiry */
memcpy(&cp.lap, &ir->lap, 3);
cp.length = ir->length;
cp.num_rsp = ir->num_rsp;
hci_req_add(req, HCI_OP_INQUIRY, sizeof(cp), &cp);
}
static int wait_inquiry(void *word)
{
schedule();
return signal_pending(current);
}
int hci_inquiry(void __user *arg)
{
__u8 __user *ptr = arg;
struct hci_inquiry_req ir;
struct hci_dev *hdev;
int err = 0, do_inquiry = 0, max_rsp;
long timeo;
__u8 *buf;
if (copy_from_user(&ir, ptr, sizeof(ir)))
return -EFAULT;
hdev = hci_dev_get(ir.dev_id);
if (!hdev)
return -ENODEV;
hci_dev_lock(hdev);
if (inquiry_cache_age(hdev) > INQUIRY_CACHE_AGE_MAX ||
inquiry_cache_empty(hdev) || ir.flags & IREQ_CACHE_FLUSH) {
inquiry_cache_flush(hdev);
do_inquiry = 1;
}
hci_dev_unlock(hdev);
timeo = ir.length * msecs_to_jiffies(2000);
if (do_inquiry) {
err = hci_req_sync(hdev, hci_inq_req, (unsigned long) &ir,
timeo);
if (err < 0)
goto done;
/* Wait until Inquiry procedure finishes (HCI_INQUIRY flag is
* cleared). If it is interrupted by a signal, return -EINTR.
*/
if (wait_on_bit(&hdev->flags, HCI_INQUIRY, wait_inquiry,
TASK_INTERRUPTIBLE))
return -EINTR;
}
/* for unlimited number of responses we will use buffer with
* 255 entries
*/
max_rsp = (ir.num_rsp == 0) ? 255 : ir.num_rsp;
/* cache_dump can't sleep. Therefore we allocate temp buffer and then
* copy it to the user space.
*/
buf = kmalloc(sizeof(struct inquiry_info) * max_rsp, GFP_KERNEL);
if (!buf) {
err = -ENOMEM;
goto done;
}
hci_dev_lock(hdev);
ir.num_rsp = inquiry_cache_dump(hdev, max_rsp, buf);
hci_dev_unlock(hdev);