From: Aloisio Almeida Jr <aloisio.almeida@xxxxxxxxxxxxx>
This command will enable or disable observer mode.
If LE_ENABLED is set the HCI_OP_LE_SET_SCAN_PARAMS and HCI_OP_LE_SET_SCAN_ENABLE
commands will be sent. Observer will perform a passive scan with no timeout.
If discovery is required when observer is enabled, le scan is restarted in
active mode.
If observer is enabled when discovery finishes, passive le scan
is enabled.
If observer mode is required when discovery is on going, the le scan mode does
not change until the end of discovery process.
Some changes on device lock are needed. Moving hci_dev_lock from
mgmt_interleaved_discovery to hci_cc_le_set_scan_enable.
Signed-off-by: Aloisio Almeida Jr <aloisio.almeida@xxxxxxxxxxxxx>
---
include/net/bluetooth/hci.h | 1 +
include/net/bluetooth/hci_core.h | 5 ++
include/net/bluetooth/mgmt.h | 3 +
net/bluetooth/hci_core.c | 18 ++++-
net/bluetooth/hci_event.c | 50 +++++++-------
net/bluetooth/mgmt.c | 137 ++++++++++++++++++++++++++++++++++++---
6 files changed, 179 insertions(+), 35 deletions(-)
diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index efbdd3d..c17bb9a 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -122,6 +122,7 @@ enum {
HCI_PENDING_CLASS,
HCI_PERIODIC_INQ,
HCI_BROADCASTER,
+ HCI_OBSERVER,
};
/* HCI ioctl defines */
diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 8731add..a82d6be 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -55,6 +55,8 @@ struct inquiry_entry {
struct inquiry_data data;
};
+#define hdev_is_in_discovery(hdev) (hdev->discovery.state != DISCOVERY_STOPPED)
+
struct discovery_state {
int type;
enum {
@@ -125,7 +127,9 @@ struct le_scan_params {
};
enum {
+ LE_SCAN_REQ_REASON_RESET,
LE_SCAN_REQ_REASON_DISCOVERY,
+ LE_SCAN_REQ_REASON_OBSERVER,
};
struct broadcast_data {
@@ -1136,6 +1140,7 @@ int mgmt_read_local_oob_data_reply_complete(struct hci_dev *hdev, u8 *hash,
int mgmt_le_enable_complete(struct hci_dev *hdev, u8 enable, u8 status);
int mgmt_set_broadcaster_complete(struct hci_dev *hdev, bool changed,
u8 status);
+int mgmt_set_observer_complete(struct hci_dev *hdev, u8 enable, u8 status);
int mgmt_device_found(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
u8 addr_type, u8 *dev_class, s8 rssi, u8 cfm_name,
u8 ssp, u8 *eir, u16 eir_len);
diff --git a/include/net/bluetooth/mgmt.h b/include/net/bluetooth/mgmt.h
index bd64816..13936ab 100644
--- a/include/net/bluetooth/mgmt.h
+++ b/include/net/bluetooth/mgmt.h
@@ -93,6 +93,7 @@ struct mgmt_rp_read_index_list {
#define MGMT_SETTING_HS 0x00000100
#define MGMT_SETTING_LE 0x00000200
#define MGMT_SETTING_BROADCASTER 0x00000400
+#define MGMT_SETTING_OBSERVER 0x00000800
#define MGMT_OP_READ_INFO 0x0004
#define MGMT_READ_INFO_SIZE 0
@@ -368,6 +369,8 @@ struct mgmt_cp_unset_controller_data {
#define MGMT_OP_SET_BROADCASTER 0x002B
+#define MGMT_OP_SET_OBSERVER 0x002C
+
#define MGMT_EV_CMD_COMPLETE 0x0001
struct mgmt_ev_cmd_complete {
__le16 opcode;
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 9b6c9e4..32bf2eb 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -1672,14 +1672,28 @@ static int hci_do_le_scan(struct hci_dev *hdev, u8 type, u16 interval,
BT_DBG("%s", hdev->name);
- if (test_bit(HCI_LE_SCAN, &hdev->dev_flags))
+ if (test_bit(HCI_LE_SCAN, &hdev->dev_flags) &&
+ reason == LE_SCAN_REQ_REASON_OBSERVER)
return -EINPROGRESS;
+ memset(&cp, 0, sizeof(cp));
+
+ if (test_bit(HCI_LE_SCAN, &hdev->dev_flags) &&
+ reason == LE_SCAN_REQ_REASON_DISCOVERY) {
+ hci_dev_lock(hdev);
+ hdev->le_scan_req_reason = LE_SCAN_REQ_REASON_RESET;
+ hci_dev_unlock(hdev);
+
+ err = hci_request(hdev, le_scan_enable_req, (unsigned long) &cp,
+ timeo);
+ if (err)
+ return err;
+ }
+
param.type = type;
param.interval = interval;
param.window = window;
- memset(&cp, 0, sizeof(cp));
cp.enable = 1;
if (reason == LE_SCAN_REQ_REASON_DISCOVERY)
cp.filter_dup = 1;
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index b5eb89a..ede0b78 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -1277,42 +1277,42 @@ static void hci_cc_le_set_scan_enable(struct hci_dev *hdev,
if (!cp)
return;
- switch (cp->enable) {
- case LE_SCANNING_ENABLED:
- hci_req_complete(hdev, HCI_OP_LE_SET_SCAN_ENABLE, status);
+ hci_dev_lock(hdev);
- if (status) {
- hci_dev_lock(hdev);
- mgmt_start_discovery_failed(hdev, status);
- hci_dev_unlock(hdev);
- return;
- }
+ if (!status) {
+ if (cp->enable)
+ set_bit(HCI_LE_SCAN, &hdev->dev_flags);
+ else
+ clear_bit(HCI_LE_SCAN, &hdev->dev_flags);
+ }
- set_bit(HCI_LE_SCAN, &hdev->dev_flags);
+ if (hdev->le_scan_req_reason == LE_SCAN_REQ_REASON_RESET)
+ goto unlock;
- hci_dev_lock(hdev);
- hci_discovery_set_state(hdev, DISCOVERY_FINDING);
- hci_dev_unlock(hdev);
+ if (hdev->le_scan_req_reason == LE_SCAN_REQ_REASON_OBSERVER) {
+ mgmt_set_observer_complete(hdev, cp->enable, status);
+ goto unlock;
+ }
+
+ switch (cp->enable) {
+ case LE_SCANNING_ENABLED:
+ if (status)
+ mgmt_start_discovery_failed(hdev, status);
+ else
+ hci_discovery_set_state(hdev, DISCOVERY_FINDING);
break;
case LE_SCANNING_DISABLED:
if (status) {
- hci_dev_lock(hdev);
mgmt_stop_discovery_failed(hdev, status);
- hci_dev_unlock(hdev);
- return;
+ goto unlock;
}
- clear_bit(HCI_LE_SCAN, &hdev->dev_flags);
-
if (hdev->discovery.type == DISCOV_TYPE_INTERLEAVED &&
- hdev->discovery.state == DISCOVERY_FINDING) {
+ hdev->discovery.state == DISCOVERY_FINDING)
mgmt_interleaved_discovery(hdev);
- } else {
- hci_dev_lock(hdev);
+ else
hci_discovery_set_state(hdev, DISCOVERY_STOPPED);
- hci_dev_unlock(hdev);
- }
break;
@@ -1320,6 +1320,10 @@ static void hci_cc_le_set_scan_enable(struct hci_dev *hdev,
BT_ERR("Used reserved LE_Scan_Enable param %d", cp->enable);
break;
}
+
+unlock:
+ hci_req_complete(hdev, HCI_OP_LE_SET_SCAN_ENABLE, status);
+ hci_dev_unlock(hdev);
}
static void hci_cc_le_ltk_reply(struct hci_dev *hdev, struct sk_buff *skb)
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index bed28e4..e960da2 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -106,11 +106,13 @@ static const u16 mgmt_events[] = {
* These LE scan and inquiry parameters were chosen according to LE General
* Discovery Procedure specification.
*/
-#define LE_SCAN_TYPE 0x01
+#define LE_SCAN_TYPE_PASSIVE 0x00
+#define LE_SCAN_TYPE_ACTIVE 0x01
#define LE_SCAN_WIN 0x12
#define LE_SCAN_INT 0x12
#define LE_SCAN_TIMEOUT_LE_ONLY 10240 /* TGAP(gen_disc_scan_min) */
#define LE_SCAN_TIMEOUT_BREDR_LE 5120 /* TGAP(100)/2 */
+#define LE_SCAN_NO_TIMEOUT -1 /* Observer role */
#define INQUIRY_LEN_BREDR 0x08 /* TGAP(100) */
#define INQUIRY_LEN_BREDR_LE 0x04 /* TGAP(100)/2 */
@@ -395,6 +397,7 @@ static u32 get_supported_settings(struct hci_dev *hdev)
if (lmp_le_capable(hdev)) {
settings |= MGMT_SETTING_LE;
settings |= MGMT_SETTING_BROADCASTER;
+ settings |= MGMT_SETTING_OBSERVER;
}
return settings;
@@ -425,6 +428,9 @@ static u32 get_current_settings(struct hci_dev *hdev)
if (test_bit(HCI_BROADCASTER, &hdev->dev_flags))
settings |= MGMT_SETTING_BROADCASTER;
+ if (test_bit(HCI_OBSERVER, &hdev->dev_flags))
+ settings |= MGMT_SETTING_OBSERVER;
+
if (test_bit(HCI_LINK_SECURITY, &hdev->dev_flags))
settings |= MGMT_SETTING_LINK_SECURITY;
@@ -2318,14 +2324,10 @@ int mgmt_interleaved_discovery(struct hci_dev *hdev)
BT_DBG("%s", hdev->name);
- hci_dev_lock(hdev);
-
err = hci_do_inquiry(hdev, INQUIRY_LEN_BREDR_LE);
if (err < 0)
hci_discovery_set_state(hdev, DISCOVERY_STOPPED);
- hci_dev_unlock(hdev);
-
return err;
}
@@ -2352,7 +2354,7 @@ static int start_discovery(struct sock *sk, struct hci_dev *hdev,
goto failed;
}
- if (hdev->discovery.state != DISCOVERY_STOPPED) {
+ if (hdev_is_in_discovery(hdev)) {
err = cmd_status(sk, hdev->id, MGMT_OP_START_DISCOVERY,
MGMT_STATUS_BUSY);
goto failed;
@@ -2376,8 +2378,9 @@ static int start_discovery(struct sock *sk, struct hci_dev *hdev,
case DISCOV_TYPE_LE:
if (lmp_host_le_capable(hdev))
- err = hci_le_scan(hdev, LE_SCAN_TYPE, LE_SCAN_INT,
- LE_SCAN_WIN, LE_SCAN_TIMEOUT_LE_ONLY,
+ err = hci_le_scan(hdev, LE_SCAN_TYPE_ACTIVE,
+ LE_SCAN_INT, LE_SCAN_WIN,
+ LE_SCAN_TIMEOUT_LE_ONLY,
LE_SCAN_REQ_REASON_DISCOVERY);
else
err = -ENOTSUPP;
@@ -2385,8 +2388,9 @@ static int start_discovery(struct sock *sk, struct hci_dev *hdev,
case DISCOV_TYPE_INTERLEAVED:
if (lmp_host_le_capable(hdev) && lmp_bredr_capable(hdev))
- err = hci_le_scan(hdev, LE_SCAN_TYPE, LE_SCAN_INT,
- LE_SCAN_WIN, LE_SCAN_TIMEOUT_BREDR_LE,
+ err = hci_le_scan(hdev, LE_SCAN_TYPE_ACTIVE,
+ LE_SCAN_INT, LE_SCAN_WIN,
+ LE_SCAN_TIMEOUT_BREDR_LE,
LE_SCAN_REQ_REASON_DISCOVERY);
else
err = -ENOTSUPP;
@@ -2834,6 +2838,77 @@ static int set_broadcaster(struct sock *sk, struct hci_dev *hdev, void *data,
return set_broadcaster_le(sk, hdev, cp->val);
}
+static int set_observer_le(struct sock *sk, struct hci_dev *hdev, u8 enable)
+{
+ struct pending_cmd *cmd;
+ int err;
+
+ BT_DBG("%s enable:%i", hdev->name, enable);
+
+ hci_dev_lock(hdev);
+
+ if (!hdev_is_powered(hdev)) {
+ err = cmd_status(sk, hdev->id, MGMT_OP_SET_OBSERVER,
+ MGMT_STATUS_NOT_POWERED);
+ goto unlock;
+ }
+
+ if (mgmt_pending_find(MGMT_OP_SET_OBSERVER, hdev)) {
+ err = cmd_status(sk, hdev->id, MGMT_OP_SET_OBSERVER,
+ MGMT_STATUS_BUSY);
+ goto unlock;
+ }
+
+ if (enable == test_bit(HCI_OBSERVER, &hdev->dev_flags)) {
+ err = send_settings_rsp(sk, MGMT_OP_SET_OBSERVER, hdev);
+ goto unlock;
+ }
+
+ if (hdev_is_in_discovery(hdev)) {
+ change_bit(HCI_OBSERVER, &hdev->dev_flags);
+ err = send_settings_rsp(sk, MGMT_OP_SET_OBSERVER, hdev);
+ if (err < 0)
+ goto unlock;
+
+ err = new_settings(hdev, sk);
+ goto unlock;
+ }
+
+ cmd = mgmt_pending_add(sk, MGMT_OP_SET_OBSERVER, hdev, NULL, 0);
+ if (!cmd) {
+ err = -ENOMEM;
+ goto unlock;
+ }
+
+ if (enable)
+ err = hci_le_scan(hdev, LE_SCAN_TYPE_PASSIVE, LE_SCAN_INT,
+ LE_SCAN_WIN, LE_SCAN_NO_TIMEOUT,
+ LE_SCAN_REQ_REASON_OBSERVER);
+ else
+ err = hci_cancel_le_scan(hdev, LE_SCAN_REQ_REASON_OBSERVER);
+
+ if (err < 0)
+ mgmt_pending_remove(cmd);
+
+unlock:
+ hci_dev_unlock(hdev);
+ return err;
+}
+
+static int set_observer(struct sock *sk, struct hci_dev *hdev, void *data,
+ u16 len)
+{
+ struct mgmt_mode *cp = data;
+
+ BT_DBG("%s val:%i", hdev->name, cp->val);
+
+ if (!test_bit(HCI_LE_ENABLED, &hdev->dev_flags))
+ return cmd_status(sk, hdev->id, MGMT_OP_SET_OBSERVER,
+ MGMT_STATUS_NOT_SUPPORTED);
+
+ return set_observer_le(sk, hdev, cp->val);
+}
+
static const struct mgmt_handler {
int (*func) (struct sock *sk, struct hci_dev *hdev, void *data,
u16 data_len);
@@ -2884,6 +2959,7 @@ static const struct mgmt_handler {
{ set_controller_data, true, MGMT_SET_CONTROLLER_DATA_SIZE },
{ unset_controller_data, false, MGMT_UNSET_CONTROLLER_DATA_SIZE },
{ set_broadcaster, false, MGMT_SETTING_SIZE },
+ { set_observer, false, MGMT_SETTING_SIZE },
};
@@ -3777,6 +3853,42 @@ int mgmt_set_broadcaster_complete(struct hci_dev *hdev, bool changed, u8 status)
return err;
}
+int mgmt_set_observer_complete(struct hci_dev *hdev, u8 enable, u8 status)
+{
+ struct pending_cmd *cmd;
+ struct cmd_lookup match = { NULL, hdev };
+ bool changed = false;
+ int err = 0;
+
+ cmd = mgmt_pending_find(MGMT_OP_SET_OBSERVER, hdev);
+ if (!cmd)
+ return -ENOENT;
+
+ if (status) {
+ u8 mgmt_err = mgmt_status(status);
+ cmd_status_rsp(cmd, &mgmt_err);
+ return err;
+ }
+
+ if (enable) {
+ if (!test_and_set_bit(HCI_OBSERVER, &hdev->dev_flags))
+ changed = true;
+ } else {
+ if (test_and_clear_bit(HCI_OBSERVER, &hdev->dev_flags))
+ changed = true;
+ }
+
+ settings_rsp(cmd, &match);
+
+ if (changed)
+ err = new_settings(hdev, match.sk);
+
+ if (match.sk)
+ sock_put(match.sk);
+
+ return err;
+}
+
int mgmt_device_found(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
u8 addr_type, u8 *dev_class, s8 rssi, u8 cfm_name, u8
ssp, u8 *eir, u16 eir_len)
@@ -3893,6 +4005,11 @@ int mgmt_discovering(struct hci_dev *hdev, u8 discovering)
mgmt_pending_remove(cmd);
}
+ if (!discovering && test_bit(HCI_OBSERVER, &hdev->dev_flags))
+ hci_le_scan(hdev, LE_SCAN_TYPE_PASSIVE, LE_SCAN_INT,
+ LE_SCAN_WIN, LE_SCAN_NO_TIMEOUT,
+ LE_SCAN_REQ_REASON_OBSERVER);
+
memset(&ev, 0, sizeof(ev));
ev.type = hdev->discovery.type;
ev.discovering = discovering;
--
1.8.0.2
--
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