This patch introduces start service discovery method. The reason
behind that is to enable users to find specific services in range
by UUID. Whole filtering is done in mgmt_device_found.
Signed-off-by: Jakub Pawlowski <jpawlowski@xxxxxxxxxx>
---
include/net/bluetooth/hci.h | 1 +
include/net/bluetooth/hci_core.h | 6 +
include/net/bluetooth/mgmt.h | 9 ++
net/bluetooth/hci_core.c | 1 +
net/bluetooth/mgmt.c | 277 +++++++++++++++++++++++++++++++++++----
5 files changed, 267 insertions(+), 27 deletions(-)
diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index a8784e6..a88acee 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -211,6 +211,7 @@ enum {
*/
enum {
HCI_LE_SCAN_RESTARTING,
+ HCI_SERVICE_FILTER,
};
/* A mask for the flags that are supposed to remain when a reset happens
diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 7e10308..8017808 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -76,6 +76,11 @@ struct discovery_state {
u8 last_adv_data[HCI_MAX_AD_LENGTH];
u8 last_adv_data_len;
unsigned long flags;
+
+ /* sd prefix stands for service discovery related properties */
+ s8 sd_rssi;
+ u16 sd_num_uuid;
+ u8 (*sd_uuid)[16];
};
struct hci_conn_hash {
@@ -1396,6 +1401,7 @@ void mgmt_new_conn_param(struct hci_dev *hdev, bdaddr_t *bdaddr,
u16 max_interval, u16 latency, u16 timeout);
void mgmt_reenable_advertising(struct hci_dev *hdev);
void mgmt_smp_complete(struct hci_conn *conn, bool complete);
+void mgmt_clean_up_service_discovery(struct hci_dev *hdev);
u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency,
u16 to_multiplier);
diff --git a/include/net/bluetooth/mgmt.h b/include/net/bluetooth/mgmt.h
index b391fd6..dc21a5a 100644
--- a/include/net/bluetooth/mgmt.h
+++ b/include/net/bluetooth/mgmt.h
@@ -495,6 +495,15 @@ struct mgmt_cp_set_public_address {
} __packed;
#define MGMT_SET_PUBLIC_ADDRESS_SIZE 6
+#define MGMT_OP_START_SERVICE_DISCOVERY 0x003A
+struct mgmt_cp_start_service_discovery {
+ __u8 type;
+ __s8 rssi_threshold;
+ __le16 num_uuid;
+ __u8 uuid[0][16];
+} __packed;
+#define MGMT_START_SERVICE_DISCOVERY_SIZE 4
+
#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 688e2ca..f585364 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -3853,6 +3853,7 @@ static void le_scan_disable_work(struct work_struct *work)
BT_DBG("%s", hdev->name);
cancel_delayed_work_sync(&hdev->le_scan_restart);
+ mgmt_clean_up_service_discovery(hdev);
hci_req_init(&req, hdev);
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 3e2ba4c..f6d9da7 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -93,6 +93,7 @@ static const u16 mgmt_commands[] = {
MGMT_OP_READ_CONFIG_INFO,
MGMT_OP_SET_EXTERNAL_CONFIG,
MGMT_OP_SET_PUBLIC_ADDRESS,
+ MGMT_OP_START_SERVICE_DISCOVERY,
};
static const u16 mgmt_events[] = {
@@ -1258,6 +1259,18 @@ static void clean_up_hci_complete(struct hci_dev *hdev, u8 status)
}
}
+/* cleans up the state set up by the start_service_discovery function. */
+void mgmt_clean_up_service_discovery(struct hci_dev *hdev)
+{
+ if (!test_and_clear_bit(HCI_SERVICE_FILTER, &hdev->discovery.flags))
+ return;
+
+ cancel_delayed_work_sync(&hdev->le_scan_restart);
+ if (hdev->discovery.sd_num_uuid > 0)
+ kfree(hdev->discovery.sd_uuid);
+ hdev->discovery.sd_num_uuid = 0;
+}
+
static bool hci_stop_discovery(struct hci_request *req)
{
struct hci_dev *hdev = req->hdev;
@@ -1270,6 +1283,7 @@ static bool hci_stop_discovery(struct hci_request *req)
hci_req_add(req, HCI_OP_INQUIRY_CANCEL, 0, NULL);
} else {
cancel_delayed_work(&hdev->le_scan_disable);
+ mgmt_clean_up_service_discovery(hdev);
hci_req_add_le_scan_disable(req);
}
@@ -3737,42 +3751,83 @@ static void start_discovery_complete(struct hci_dev *hdev, u8 status)
queue_delayed_work(hdev->workqueue, &hdev->le_scan_disable, timeout);
}
+static int init_service_discovery(struct hci_dev *hdev, s8 rssi, u16 num_uuid,
+ u8 (*uuid)[16])
+{
+ hdev->discovery.sd_rssi = rssi;
+ hdev->discovery.sd_num_uuid = num_uuid;
+
+ if (num_uuid > 0) {
+ hdev->discovery.sd_uuid = kmalloc(16 * num_uuid, GFP_KERNEL);
+ if (!hdev->discovery.sd_uuid)
+ return -ENOMEM;
+ memcpy(hdev->discovery.sd_uuid, uuid, 16 * num_uuid);
+ }
+
+ set_bit(HCI_SERVICE_FILTER, &hdev->discovery.flags);
+ return 0;
+}
+
static int generic_start_discovery(struct sock *sk, struct hci_dev *hdev,
void *data, u16 len, u16 opcode)
{
- struct mgmt_cp_start_discovery *cp = data;
struct pending_cmd *cmd;
struct hci_cp_le_set_scan_param param_cp;
struct hci_cp_le_set_scan_enable enable_cp;
struct hci_cp_inquiry inq_cp;
struct hci_request req;
/* General inquiry access code (GIAC) */
+ s8 sd_rssi = 0;
u8 lap[3] = { 0x33, 0x8b, 0x9e };
- u8 status, own_addr_type;
+ u8 status, own_addr_type, type;
+ u8 (*sd_uuid)[16] = NULL;
+ u16 sd_num_uuid = 0;
int err;
BT_DBG("%s", hdev->name);
+ if (opcode == MGMT_OP_START_SERVICE_DISCOVERY) {
+ struct mgmt_cp_start_service_discovery *cp = data;
+ u16 expected_len, num_uuid_tmp;
+
+ type = cp->type;
+ num_uuid_tmp = __le16_to_cpu(cp->num_uuid);
+ expected_len = sizeof(*cp) + num_uuid_tmp * 16;
+
+ if (expected_len != len) {
+ return cmd_complete(sk, hdev->id, opcode,
+ MGMT_STATUS_INVALID_PARAMS, &type,
+ sizeof(type));
+ }
+
+ sd_rssi = cp->rssi_threshold;
+ sd_num_uuid = num_uuid_tmp;
+ if (sd_num_uuid > 0)
+ sd_uuid = cp->uuid;
+ } else {
+ struct mgmt_cp_start_discovery *cp = data;
+
+ type = cp->type;
+ }
+
hci_dev_lock(hdev);
if (!hdev_is_powered(hdev)) {
err = cmd_complete(sk, hdev->id, opcode,
- MGMT_STATUS_NOT_POWERED,
- &cp->type, sizeof(cp->type));
+ MGMT_STATUS_NOT_POWERED, &type,
+ sizeof(type));
goto failed;
}
if (test_bit(HCI_PERIODIC_INQ, &hdev->dev_flags)) {
err = cmd_complete(sk, hdev->id, opcode,
- MGMT_STATUS_BUSY, &cp->type,
- sizeof(cp->type));
+ MGMT_STATUS_BUSY, &type, sizeof(type));
goto failed;
}
if (hdev->discovery.state != DISCOVERY_STOPPED) {
err = cmd_complete(sk, hdev->id, opcode,
- MGMT_STATUS_BUSY, &cp->type,
- sizeof(cp->type));
+ MGMT_STATUS_BUSY, &type, sizeof(type));
goto failed;
}
@@ -3782,7 +3837,7 @@ static int generic_start_discovery(struct sock *sk, struct hci_dev *hdev,
goto failed;
}
- hdev->discovery.type = cp->type;
+ hdev->discovery.type = type;
hci_req_init(&req, hdev);
@@ -3790,16 +3845,16 @@ static int generic_start_discovery(struct sock *sk, struct hci_dev *hdev,
case DISCOV_TYPE_BREDR:
status = mgmt_bredr_support(hdev);
if (status) {
- err = cmd_complete(sk, hdev->id, opcode, status,
- &cp->type, sizeof(cp->type));
+ err = cmd_complete(sk, hdev->id, opcode, status, &type,
+ sizeof(type));
mgmt_pending_remove(cmd);
goto failed;
}
if (test_bit(HCI_INQUIRY, &hdev->flags)) {
err = cmd_complete(sk, hdev->id, opcode,
- MGMT_STATUS_BUSY, &cp->type,
- sizeof(cp->type));
+ MGMT_STATUS_BUSY, &type,
+ sizeof(type));
mgmt_pending_remove(cmd);
goto failed;
}
@@ -3816,8 +3871,8 @@ static int generic_start_discovery(struct sock *sk, struct hci_dev *hdev,
case DISCOV_TYPE_INTERLEAVED:
status = mgmt_le_support(hdev);
if (status) {
- err = cmd_complete(sk, hdev->id, opcode, status,
- &cp->type, sizeof(cp->type));
+ err = cmd_complete(sk, hdev->id, opcode, status, &type,
+ sizeof(type));
mgmt_pending_remove(cmd);
goto failed;
}
@@ -3825,8 +3880,8 @@ static int generic_start_discovery(struct sock *sk, struct hci_dev *hdev,
if (hdev->discovery.type == DISCOV_TYPE_INTERLEAVED &&
!test_bit(HCI_BREDR_ENABLED, &hdev->dev_flags)) {
err = cmd_complete(sk, hdev->id, opcode,
- MGMT_STATUS_NOT_SUPPORTED,
- &cp->type, sizeof(cp->type));
+ MGMT_STATUS_NOT_SUPPORTED, &type,
+ sizeof(type));
mgmt_pending_remove(cmd);
goto failed;
}
@@ -3839,9 +3894,8 @@ static int generic_start_discovery(struct sock *sk, struct hci_dev *hdev,
if (hci_conn_hash_lookup_state(hdev, LE_LINK,
BT_CONNECT)) {
err = cmd_complete(sk, hdev->id, opcode,
- MGMT_STATUS_REJECTED,
- &cp->type,
- sizeof(cp->type));
+ MGMT_STATUS_REJECTED, &type,
+ sizeof(type));
mgmt_pending_remove(cmd);
goto failed;
}
@@ -3865,8 +3919,8 @@ static int generic_start_discovery(struct sock *sk, struct hci_dev *hdev,
err = hci_update_random_address(&req, true, &own_addr_type);
if (err < 0) {
err = cmd_complete(sk, hdev->id, opcode,
- MGMT_STATUS_FAILED,
- &cp->type, sizeof(cp->type));
+ MGMT_STATUS_FAILED, &type,
+ sizeof(type));
mgmt_pending_remove(cmd);
goto failed;
}
@@ -3887,13 +3941,21 @@ static int generic_start_discovery(struct sock *sk, struct hci_dev *hdev,
default:
err = cmd_complete(sk, hdev->id, opcode,
- MGMT_STATUS_INVALID_PARAMS,
- &cp->type, sizeof(cp->type));
+ MGMT_STATUS_INVALID_PARAMS, &type,
+ sizeof(type));
mgmt_pending_remove(cmd);
goto failed;
}
+ if (opcode == MGMT_OP_START_SERVICE_DISCOVERY) {
+ err = init_service_discovery(hdev, sd_rssi, sd_num_uuid,
+ sd_uuid);
+ if (err)
+ goto failed;
+ }
+
err = hci_req_run(&req, start_discovery_complete);
+
if (err < 0)
mgmt_pending_remove(cmd);
else
@@ -5685,6 +5747,13 @@ unlock:
return err;
}
+static int start_service_discovery(struct sock *sk, struct hci_dev *hdev,
+ void *data, u16 len)
+{
+ return generic_start_discovery(sk, hdev, data, len,
+ MGMT_OP_START_SERVICE_DISCOVERY);
+}
+
static const struct mgmt_handler {
int (*func) (struct sock *sk, struct hci_dev *hdev, void *data,
u16 data_len);
@@ -5749,6 +5818,7 @@ static const struct mgmt_handler {
{ read_config_info, false, MGMT_READ_CONFIG_INFO_SIZE },
{ set_external_config, false, MGMT_SET_EXTERNAL_CONFIG_SIZE },
{ set_public_address, false, MGMT_SET_PUBLIC_ADDRESS_SIZE },
+ { start_service_discovery, true, MGMT_START_SERVICE_DISCOVERY_SIZE },
};
int mgmt_control(struct sock *sk, struct msghdr *msg, size_t msglen)
@@ -6815,6 +6885,127 @@ void mgmt_read_local_oob_data_complete(struct hci_dev *hdev, u8 *hash192,
mgmt_pending_remove(cmd);
}
+struct parsed_uuid {
+ struct list_head list;
+ u8 uuid[16];
+};
+
+/* this is reversed hex representation of bluetooth base uuid. We need it for
+ * service uuid parsing in eir.
+ */
+static const u8 reverse_base_uuid[] = {
+ 0xfb, 0x34, 0x9b, 0x5f, 0x80, 0x00, 0x00, 0x80,
+ 0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+};
+
+static int add_uuid_to_list(struct list_head *uuids, u8 *uuid)
+{
+ struct parsed_uuid *tmp_uuid;
+
+ tmp_uuid = kmalloc(sizeof(*tmp_uuid), GFP_KERNEL);
+ if (tmp_uuid == NULL)
+ return -ENOMEM;
+
+ memcpy(tmp_uuid->uuid, uuid, 16);
+ INIT_LIST_HEAD(&tmp_uuid->list);
+ list_add(&tmp_uuid->list, uuids);
+ return 0;
+}
+
+static void free_uuids_list(struct list_head *uuids)
+{
+ struct parsed_uuid *uuid, *tmp;
+
+ list_for_each_entry_safe(uuid, tmp, uuids, list) {
+ __list_del_entry(&uuid->list);
+ kfree(uuid);
+ }
+}
+
+static int eir_parse(u8 *eir, u8 eir_len, struct list_head *uuids)
+{
+ size_t offset;
+ u8 uuid[16];
+ int i, ret;
+
+ offset = 0;
+ while (offset < eir_len) {
+ uint8_t field_len = eir[0];
+
+ /* Check for the end of EIR */
+ if (field_len == 0)
+ break;
+
+ if (offset + field_len > eir_len)
+ return -EINVAL;
+
+ switch (eir[1]) {
+ case EIR_UUID16_ALL:
+ case EIR_UUID16_SOME:
+ for (i = 0; i + 3 <= field_len; i += 2) {
+ memcpy(uuid, reverse_base_uuid, 16);
+ uuid[13] = eir[i + 3];
+ uuid[12] = eir[i + 2];
+ ret = add_uuid_to_list(uuids, uuid);
+ if (ret)
+ return ret;
+ }
+ break;
+ case EIR_UUID32_ALL:
+ case EIR_UUID32_SOME:
+ for (i = 0; i + 5 <= field_len; i += 4) {
+ memcpy(uuid, reverse_base_uuid, 16);
+ uuid[15] = eir[i + 5];
+ uuid[14] = eir[i + 4];
+ uuid[13] = eir[i + 3];
+ uuid[12] = eir[i + 2];
+ ret = add_uuid_to_list(uuids, uuid);
+ if (ret)
+ return ret;
+ }
+ break;
+ case EIR_UUID128_ALL:
+ case EIR_UUID128_SOME:
+ for (i = 0; i + 17 <= field_len; i += 16) {
+ memcpy(uuid, eir + i + 2, 16);
+ ret = add_uuid_to_list(uuids, uuid);
+ if (ret)
+ return ret;
+ }
+ break;
+ }
+
+ offset += field_len + 1;
+ eir += field_len + 1;
+ }
+ return 0;
+}
+
+enum {
+ NO_MATCH,
+ SERVICE_MATCH,
+ FULL_MATCH
+};
+
+static u8 find_matches(struct hci_dev *hdev, s8 rssi, struct list_head *uuids)
+{
+ struct parsed_uuid *uuidptr, *tmp_uuid;
+ int i, match_type = NO_MATCH, min_rssi = hdev->discovery.sd_rssi;
+
+ list_for_each_entry_safe(uuidptr, tmp_uuid, uuids, list) {
+ for (i = 0; i < hdev->discovery.sd_num_uuid; i++) {
+ u8 *filter_uuid = hdev->discovery.sd_uuid[i];
+
+ if (memcmp(filter_uuid, uuidptr->uuid, 16) != 0)
+ continue;
+ if (rssi >= min_rssi)
+ return FULL_MATCH;
+ match_type = SERVICE_MATCH;
+ }
+ }
+ return match_type;
+}
+
void mgmt_device_found(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
u8 addr_type, u8 *dev_class, s8 rssi, u32 flags,
u8 *eir, u16 eir_len, u8 *scan_rsp, u8 scan_rsp_len)
@@ -6822,6 +7013,9 @@ void mgmt_device_found(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
char buf[512];
struct mgmt_ev_device_found *ev = (void *) buf;
size_t ev_size;
+ LIST_HEAD(uuids);
+ int err = 0;
+ u8 match_type;
/* Don't send events for a non-kernel initiated discovery. With
* LE one exception is if we have pend_le_reports > 0 in which
@@ -6860,7 +7054,31 @@ void mgmt_device_found(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
ev->eir_len = cpu_to_le16(eir_len + scan_rsp_len);
ev_size = sizeof(*ev) + eir_len + scan_rsp_len;
- mgmt_event(MGMT_EV_DEVICE_FOUND, hdev, ev, ev_size, NULL);
+ if (!test_bit(HCI_SERVICE_FILTER, &hdev->discovery.flags) ||
+ (hdev->discovery.sd_rssi == 127 &&
+ hdev->discovery.sd_num_uuid == 0)) {
+ mgmt_event(MGMT_EV_DEVICE_FOUND, hdev, ev, ev_size, NULL);
+ return;
+ }
+
+ err = eir_parse(eir, eir_len, &uuids);
+ if (err) {
+ free_uuids_list(&uuids);
+ return;
+ }
+
+ match_type = find_matches(hdev, rssi, &uuids);
+ free_uuids_list(&uuids);
+
+ if (match_type == NO_MATCH)
+ return;
+
+ if (test_bit(HCI_QUIRK_STRICT_DUPLICATE_FILTER, &hdev->quirks))
+ hci_restart_le_scan(hdev);
+
+ if (match_type == FULL_MATCH)
+ mgmt_event(MGMT_EV_DEVICE_FOUND, hdev, ev,
+ ev_size, NULL);
}
void mgmt_remote_name(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
@@ -6893,10 +7111,15 @@ void mgmt_discovering(struct hci_dev *hdev, u8 discovering)
BT_DBG("%s discovering %u", hdev->name, discovering);
- if (discovering)
+ if (discovering) {
cmd = mgmt_pending_find(MGMT_OP_START_DISCOVERY, hdev);
- else
+ if (cmd == NULL)
+ cmd = mgmt_pending_find(MGMT_OP_START_SERVICE_DISCOVERY,
+ hdev);
+
+ } else {
cmd = mgmt_pending_find(MGMT_OP_STOP_DISCOVERY, hdev);
+ }
if (cmd != NULL) {
u8 type = hdev->discovery.type;
--
2.1.0.rc2.206.gedb03e5
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