Commit 24b4f38f authored by Arman Uguray's avatar Arman Uguray Committed by Marcel Holtmann
Browse files

Bluetooth: Implement the Add Advertising command 



This patch adds the most basic implementation for the
"Add Advertisement" command. All state updates between the
various HCI settings (POWERED, ADVERTISING, ADVERTISING_INSTANCE,
and LE_ENABLED) has been implemented. The command currently
supports only setting the advertising data fields, with no flags
and no scan response data.

Signed-off-by: default avatarArman Uguray <armansito@chromium.org>
Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
parent 203fea01

net/bluetooth/mgmt.c

+273 −10
Original line number Diff line number Diff line
@@ -100,6 +100,7 @@ static const u16 mgmt_commands[] = { 
	MGMT_OP_READ_LOCAL_OOB_EXT_DATA,

	MGMT_OP_READ_EXT_INDEX_LIST,

	MGMT_OP_READ_ADV_FEATURES,

	MGMT_OP_ADD_ADVERTISING,

};



static const u16 mgmt_events[] = {
@@ -135,6 +136,8 @@ static const u16 mgmt_events[] = { 
	MGMT_EV_EXT_INDEX_ADDED,

	MGMT_EV_EXT_INDEX_REMOVED,

	MGMT_EV_LOCAL_OOB_DATA_UPDATED,

	MGMT_EV_ADVERTISING_ADDED,

	MGMT_EV_ADVERTISING_REMOVED,

};



#define CACHE_TIMEOUT	msecs_to_jiffies(2 * 1000)
@@ -864,7 +867,7 @@ static u8 get_adv_discov_flags(struct hci_dev *hdev) 
	return 0;

}



static u8 create_adv_data(struct hci_dev *hdev, u8 *ptr)

static u8 create_default_adv_data(struct hci_dev *hdev, u8 *ptr)

{

	u8 ad_len = 0, flags = 0;
@@ -896,7 +899,18 @@ static u8 create_adv_data(struct hci_dev *hdev, u8 *ptr) 
	return ad_len;

}



static void update_adv_data(struct hci_request *req)

static u8 create_instance_adv_data(struct hci_dev *hdev, u8 *ptr)

{

	/* TODO: Set the appropriate entries based on advertising instance flags

	 * here once flags other than 0 are supported.

	 */

	memcpy(ptr, hdev->adv_instance.adv_data,

	       hdev->adv_instance.adv_data_len);



	return hdev->adv_instance.adv_data_len;

}



static void update_adv_data_for_instance(struct hci_request *req, u8 instance)

{

	struct hci_dev *hdev = req->hdev;

	struct hci_cp_le_set_adv_data cp;
@@ -907,8 +921,12 @@ static void update_adv_data(struct hci_request *req) 


	memset(&cp, 0, sizeof(cp));



	len = create_adv_data(hdev, cp.data);

	if (instance)

		len = create_instance_adv_data(hdev, cp.data);

	else

		len = create_default_adv_data(hdev, cp.data);



	/* There's nothing to do if the data hasn't changed */

	if (hdev->adv_data_len == len &&

	    memcmp(cp.data, hdev->adv_data, len) == 0)

		return;
@@ -921,6 +939,25 @@ static void update_adv_data(struct hci_request *req) 
	hci_req_add(req, HCI_OP_LE_SET_ADV_DATA, sizeof(cp), &cp);

}



static void update_adv_data(struct hci_request *req)

{

	struct hci_dev *hdev = req->hdev;

	u8 instance;



	/* The "Set Advertising" setting supersedes the "Add Advertising"

	 * setting. Here we set the advertising data based on which

	 * setting was set. When neither apply, default to the global settings,

	 * represented by instance "0".

	 */

	if (hci_dev_test_flag(hdev, HCI_ADVERTISING_INSTANCE) &&

	    !hci_dev_test_flag(hdev, HCI_ADVERTISING))

		instance = 0x01;

	else

		instance = 0x00;



	update_adv_data_for_instance(req, instance);

}



int mgmt_update_adv_data(struct hci_dev *hdev)

{

	struct hci_request req;
@@ -4374,10 +4411,17 @@ static int set_device_id(struct sock *sk, struct hci_dev *hdev, void *data, 
	return err;

}



static void enable_advertising_instance(struct hci_dev *hdev, u8 status,

					u16 opcode)

{

	BT_DBG("status %d", status);

}



static void set_advertising_complete(struct hci_dev *hdev, u8 status,

				     u16 opcode)

{

	struct cmd_lookup match = { NULL, hdev };

	struct hci_request req;



	hci_dev_lock(hdev);
@@ -4402,6 +4446,21 @@ static void set_advertising_complete(struct hci_dev *hdev, u8 status, 
	if (match.sk)

		sock_put(match.sk);



	/* If "Set Advertising" was just disabled and instance advertising was

	 * set up earlier, then enable the advertising instance.

	 */

	if (hci_dev_test_flag(hdev, HCI_ADVERTISING) ||

	    !hci_dev_test_flag(hdev, HCI_ADVERTISING_INSTANCE))

		goto unlock;



	hci_req_init(&req, hdev);



	update_adv_data(&req);

	enable_advertising(&req);



	if (hci_req_run(&req, enable_advertising_instance) < 0)

		BT_ERR("Failed to re-configure advertising");



unlock:

	hci_dev_unlock(hdev);

}
@@ -4484,10 +4543,13 @@ static int set_advertising(struct sock *sk, struct hci_dev *hdev, void *data, 
	else

		hci_dev_clear_flag(hdev, HCI_ADVERTISING_CONNECTABLE);



	if (val)

	if (val) {

		/* Switch to instance "0" for the Set Advertising setting. */

		update_adv_data_for_instance(&req, 0);

		enable_advertising(&req);

	else

	} else {

		disable_advertising(&req);

	}



	err = hci_req_run(&req, set_advertising_complete);

	if (err < 0)
@@ -6299,12 +6361,21 @@ static int read_adv_features(struct sock *sk, struct hci_dev *hdev, 
	struct mgmt_rp_read_adv_features *rp;

	size_t rp_len;

	int err;

	bool instance;



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



	hci_dev_lock(hdev);



	rp_len = sizeof(*rp);



	/* Currently only one instance is supported, so just add 1 to the

	 * response length.

	 */

	instance = hci_dev_test_flag(hdev, HCI_ADVERTISING_INSTANCE);

	if (instance)

		rp_len++;



	rp = kmalloc(rp_len, GFP_ATOMIC);

	if (!rp) {

		hci_dev_unlock(hdev);
@@ -6314,8 +6385,17 @@ static int read_adv_features(struct sock *sk, struct hci_dev *hdev, 
	rp->supported_flags = cpu_to_le32(0);

	rp->max_adv_data_len = HCI_MAX_AD_LENGTH;

	rp->max_scan_rsp_len = HCI_MAX_AD_LENGTH;

	rp->max_instances = 0;

	rp->max_instances = 1;



	/* Currently only one instance is supported, so simply return the

	 * current instance number.

	 */

	if (instance) {

		rp->num_instances = 1;

		rp->instance[0] = 1;

	} else {

		rp->num_instances = 0;

	}



	hci_dev_unlock(hdev);
@@ -6327,6 +6407,179 @@ static int read_adv_features(struct sock *sk, struct hci_dev *hdev, 
	return err;

}



static bool adv_data_is_valid(struct hci_dev *hdev, u32 adv_flags, u8 *adv_data,

			      u8 adv_data_len)

{

	u8 max_adv_len = HCI_MAX_AD_LENGTH;

	int i, cur_len;



	/* TODO: Correctly reduce adv_len based on adv_flags. */



	if (adv_data_len > max_adv_len)

		return false;



	/* Make sure that adv_data is correctly formatted. */

	for (i = 0, cur_len = 0; i < adv_data_len; i += (cur_len + 1)) {

		cur_len = adv_data[i];



		/* If the current field length would exceed the total data

		 * length, then it's invalid.

		 */

		if (i + cur_len >= adv_data_len)

			return false;

	}



	return true;

}



static void advertising_added(struct sock *sk, struct hci_dev *hdev,

			      u8 instance)

{

	struct mgmt_ev_advertising_added ev;



	ev.instance = instance;



	mgmt_event(MGMT_EV_ADVERTISING_ADDED, hdev, &ev, sizeof(ev), sk);

}



static void advertising_removed(struct sock *sk, struct hci_dev *hdev,

				u8 instance)

{

	struct mgmt_ev_advertising_removed ev;



	ev.instance = instance;



	mgmt_event(MGMT_EV_ADVERTISING_REMOVED, hdev, &ev, sizeof(ev), sk);

}



static void add_advertising_complete(struct hci_dev *hdev, u8 status,

				     u16 opcode)

{

	struct mgmt_pending_cmd *cmd;

	struct mgmt_rp_add_advertising rp;



	BT_DBG("status %d", status);



	hci_dev_lock(hdev);



	cmd = pending_find(MGMT_OP_ADD_ADVERTISING, hdev);



	if (status) {

		hci_dev_clear_flag(hdev, HCI_ADVERTISING_INSTANCE);

		memset(&hdev->adv_instance, 0, sizeof(hdev->adv_instance));

		advertising_removed(cmd ? cmd->sk : NULL, hdev, 1);

	}



	if (!cmd)

		goto unlock;



	rp.instance = 0x01;



	if (status)

		mgmt_cmd_status(cmd->sk, cmd->index, cmd->opcode,

				mgmt_status(status));

	else

		mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode,

				  mgmt_status(status), &rp, sizeof(rp));



	mgmt_pending_remove(cmd);



unlock:

	hci_dev_unlock(hdev);

}



static int add_advertising(struct sock *sk, struct hci_dev *hdev,

			   void *data, u16 data_len)

{

	struct mgmt_cp_add_advertising *cp = data;

	struct mgmt_rp_add_advertising rp;

	u32 flags;

	u8 status;

	int err;

	struct mgmt_pending_cmd *cmd;

	struct hci_request req;



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



	status = mgmt_le_support(hdev);

	if (status)

		return mgmt_cmd_status(sk, hdev->id, MGMT_OP_ADD_ADVERTISING,

				       status);



	flags = __le32_to_cpu(cp->flags);



	/* The current implementation only supports adding one instance and

	 * doesn't support flags.

	 */

	if (cp->instance != 0x01 || flags)

		return mgmt_cmd_status(sk, hdev->id, MGMT_OP_ADD_ADVERTISING,

				       MGMT_STATUS_INVALID_PARAMS);



	hci_dev_lock(hdev);



	if (pending_find(MGMT_OP_ADD_ADVERTISING, hdev) ||

	    pending_find(MGMT_OP_SET_LE, hdev)) {

		err = mgmt_cmd_status(sk, hdev->id, MGMT_OP_ADD_ADVERTISING,

				      MGMT_STATUS_BUSY);

		goto unlock;

	}



	if (!adv_data_is_valid(hdev, flags, cp->data, cp->adv_data_len)) {

		err = mgmt_cmd_status(sk, hdev->id, MGMT_OP_ADD_ADVERTISING,

				      MGMT_STATUS_INVALID_PARAMS);

		goto unlock;

	}



	hdev->adv_instance.flags = flags;

	hdev->adv_instance.adv_data_len = cp->adv_data_len;

	hdev->adv_instance.scan_rsp_len = cp->scan_rsp_len;



	if (cp->adv_data_len)

		memcpy(hdev->adv_instance.adv_data, cp->data, cp->adv_data_len);



	if (cp->scan_rsp_len)

		memcpy(hdev->adv_instance.scan_rsp_data,

		       cp->data + cp->adv_data_len, cp->scan_rsp_len);



	if (!hci_dev_test_and_set_flag(hdev, HCI_ADVERTISING_INSTANCE))

		advertising_added(sk, hdev, 1);



	/* If the HCI_ADVERTISING flag is set or the device isn't powered then

	 * we have no HCI communication to make. Simply return.

	 */

	if (!hdev_is_powered(hdev) ||

	    hci_dev_test_flag(hdev, HCI_ADVERTISING)) {

		rp.instance = 0x01;

		err = mgmt_cmd_complete(sk, hdev->id, MGMT_OP_ADD_ADVERTISING,

					MGMT_STATUS_SUCCESS, &rp, sizeof(rp));

		goto unlock;

	}



	/* We're good to go, update advertising data, parameters, and start

	 * advertising.

	 */

	cmd = mgmt_pending_add(sk, MGMT_OP_ADD_ADVERTISING, hdev, data,

			       data_len);

	if (!cmd) {

		err = -ENOMEM;

		goto unlock;

	}



	hci_req_init(&req, hdev);



	update_adv_data(&req);

	enable_advertising(&req);



	err = hci_req_run(&req, add_advertising_complete);

	if (err < 0)

		mgmt_pending_remove(cmd);



unlock:

	hci_dev_unlock(hdev);



	return err;

}



static const struct hci_mgmt_handler mgmt_handlers[] = {

	{ NULL }, /* 0x0000 (no command) */

	{ read_version,            MGMT_READ_VERSION_SIZE,
@@ -6411,6 +6664,8 @@ static const struct hci_mgmt_handler mgmt_handlers[] = { 
						HCI_MGMT_NO_HDEV |

						HCI_MGMT_UNTRUSTED },

	{ read_adv_features,       MGMT_READ_ADV_FEATURES_SIZE },

	{ add_advertising,	   MGMT_ADD_ADVERTISING_SIZE,

						HCI_MGMT_VAR_LEN },

};



void mgmt_index_added(struct hci_dev *hdev)
@@ -6582,7 +6837,8 @@ static int powered_update_hci(struct hci_dev *hdev) 
			update_scan_rsp_data(&req);

		}



		if (hci_dev_test_flag(hdev, HCI_ADVERTISING))

		if (hci_dev_test_flag(hdev, HCI_ADVERTISING) ||

		    hci_dev_test_flag(hdev, HCI_ADVERTISING_INSTANCE))

			enable_advertising(&req);



		restart_le_actions(&req);
@@ -6694,7 +6950,13 @@ void mgmt_discoverable_timeout(struct hci_dev *hdev) 
			    sizeof(scan), &scan);

	}

	update_class(&req);



	/* Advertising instances don't use the global discoverable setting, so

	 * only update AD if advertising was enabled using Set Advertising.

	 */

	if (hci_dev_test_flag(hdev, HCI_ADVERTISING))

		update_adv_data(&req);



	hci_req_run(&req, NULL);



	hdev->discov_timeout = 0;
@@ -7595,7 +7857,8 @@ void mgmt_reenable_advertising(struct hci_dev *hdev) 
{

	struct hci_request req;



	if (!hci_dev_test_flag(hdev, HCI_ADVERTISING))

	if (!hci_dev_test_flag(hdev, HCI_ADVERTISING) &&

	    !hci_dev_test_flag(hdev, HCI_ADVERTISING_INSTANCE))

		return;



	hci_req_init(&req, hdev);

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