Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 80a1e1db authored by Johan Hedberg's avatar Johan Hedberg Committed by Gustavo Padovan
Browse files

Bluetooth: Add local Extended Inquiry Response (EIR) support 



This patch adds automated creation of the local EIR data based on what
16-bit UUIDs are registered and what the device name is. This should
cover the majority use cases, however things like 32/128-bit UUIDs, TX
power and Device ID will need to be added later to be on par with what
bluetoothd is capable of doing (without the Management interface).

Signed-off-by: default avatarJohan Hedberg <johan.hedberg@nokia.com>
Signed-off-by: default avatarGustavo F. Padovan <padovan@profusion.mobi>
parent e90165be

include/net/bluetooth/hci.h

+8 −0
Original line number Diff line number Diff line
@@ -614,6 +614,14 @@ struct hci_cp_host_buffer_size { 


#define HCI_OP_WRITE_INQUIRY_MODE	0x0c45



#define HCI_MAX_EIR_LENGTH		240



#define HCI_OP_WRITE_EIR		0x0c52

struct hci_cp_write_eir {

	uint8_t		fec;

	uint8_t		data[HCI_MAX_EIR_LENGTH];

} __packed;



#define HCI_OP_READ_SSP_MODE		0x0c55

struct hci_rp_read_ssp_mode {

	__u8     status;

include/net/bluetooth/hci_core.h

+1 −0
Original line number Diff line number Diff line
@@ -102,6 +102,7 @@ struct hci_dev { 
	__u8		dev_type;

	bdaddr_t	bdaddr;

	__u8		dev_name[HCI_MAX_NAME_LENGTH];

	__u8		eir[HCI_MAX_EIR_LENGTH];

	__u8		dev_class[3];

	__u8		major_class;

	__u8		minor_class;

net/bluetooth/mgmt.c

+163 −0
Original line number Diff line number Diff line
@@ -544,6 +544,150 @@ static int set_pairable(struct sock *sk, u16 index, unsigned char *data, 
	return err;

}



#define EIR_FLAGS		0x01 /* flags */

#define EIR_UUID16_SOME		0x02 /* 16-bit UUID, more available */

#define EIR_UUID16_ALL		0x03 /* 16-bit UUID, all listed */

#define EIR_UUID32_SOME		0x04 /* 32-bit UUID, more available */

#define EIR_UUID32_ALL		0x05 /* 32-bit UUID, all listed */

#define EIR_UUID128_SOME	0x06 /* 128-bit UUID, more available */

#define EIR_UUID128_ALL		0x07 /* 128-bit UUID, all listed */

#define EIR_NAME_SHORT		0x08 /* shortened local name */

#define EIR_NAME_COMPLETE	0x09 /* complete local name */

#define EIR_TX_POWER		0x0A /* transmit power level */

#define EIR_DEVICE_ID		0x10 /* device ID */



#define PNP_INFO_SVCLASS_ID		0x1200



static u8 bluetooth_base_uuid[] = {

			0xFB, 0x34, 0x9B, 0x5F, 0x80, 0x00, 0x00, 0x80,

			0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

};



static u16 get_uuid16(u8 *uuid128)

{

	u32 val;

	int i;



	for (i = 0; i < 12; i++) {

		if (bluetooth_base_uuid[i] != uuid128[i])

			return 0;

	}



	memcpy(&val, &uuid128[12], 4);



	val = le32_to_cpu(val);

	if (val > 0xffff)

		return 0;



	return (u16) val;

}



static void create_eir(struct hci_dev *hdev, u8 *data)

{

	u8 *ptr = data;

	u16 eir_len = 0;

	u16 uuid16_list[HCI_MAX_EIR_LENGTH / sizeof(u16)];

	int i, truncated = 0;

	struct list_head *p;

	size_t name_len;



	name_len = strlen(hdev->dev_name);



	if (name_len > 0) {

		/* EIR Data type */

		if (name_len > 48) {

			name_len = 48;

			ptr[1] = EIR_NAME_SHORT;

		} else

			ptr[1] = EIR_NAME_COMPLETE;



		/* EIR Data length */

		ptr[0] = name_len + 1;



		memcpy(ptr + 2, hdev->dev_name, name_len);



		eir_len += (name_len + 2);

		ptr += (name_len + 2);

	}



	memset(uuid16_list, 0, sizeof(uuid16_list));



	/* Group all UUID16 types */

	list_for_each(p, &hdev->uuids) {

		struct bt_uuid *uuid = list_entry(p, struct bt_uuid, list);

		u16 uuid16;



		uuid16 = get_uuid16(uuid->uuid);

		if (uuid16 == 0)

			return;



		if (uuid16 < 0x1100)

			continue;



		if (uuid16 == PNP_INFO_SVCLASS_ID)

			continue;



		/* Stop if not enough space to put next UUID */

		if (eir_len + 2 + sizeof(u16) > HCI_MAX_EIR_LENGTH) {

			truncated = 1;

			break;

		}



		/* Check for duplicates */

		for (i = 0; uuid16_list[i] != 0; i++)

			if (uuid16_list[i] == uuid16)

				break;



		if (uuid16_list[i] == 0) {

			uuid16_list[i] = uuid16;

			eir_len += sizeof(u16);

		}

	}



	if (uuid16_list[0] != 0) {

		u8 *length = ptr;



		/* EIR Data type */

		ptr[1] = truncated ? EIR_UUID16_SOME : EIR_UUID16_ALL;



		ptr += 2;

		eir_len += 2;



		for (i = 0; uuid16_list[i] != 0; i++) {

			*ptr++ = (uuid16_list[i] & 0x00ff);

			*ptr++ = (uuid16_list[i] & 0xff00) >> 8;

		}



		/* EIR Data length */

		*length = (i * sizeof(u16)) + 1;

	}

}



static int update_eir(struct hci_dev *hdev)

{

	struct hci_cp_write_eir cp;



	if (!(hdev->features[6] & LMP_EXT_INQ))

		return 0;



	if (hdev->ssp_mode == 0)

		return 0;



	if (test_bit(HCI_SERVICE_CACHE, &hdev->flags))

		return 0;



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



	create_eir(hdev, cp.data);



	if (memcmp(cp.data, hdev->eir, sizeof(cp.data)) == 0)

		return 0;



	memcpy(hdev->eir, cp.data, sizeof(cp.data));



	return hci_send_cmd(hdev, HCI_OP_WRITE_EIR, sizeof(cp), &cp);

}



static u8 get_service_classes(struct hci_dev *hdev)

{

	struct list_head *p;
@@ -612,6 +756,10 @@ static int add_uuid(struct sock *sk, u16 index, unsigned char *data, u16 len) 
	if (err < 0)

		goto failed;



	err = update_eir(hdev);

	if (err < 0)

		goto failed;



	err = cmd_complete(sk, index, MGMT_OP_ADD_UUID, NULL, 0);



failed:
@@ -668,6 +816,10 @@ static int remove_uuid(struct sock *sk, u16 index, unsigned char *data, u16 len) 
	if (err < 0)

		goto unlock;



	err = update_eir(hdev);

	if (err < 0)

		goto unlock;



	err = cmd_complete(sk, index, MGMT_OP_REMOVE_UUID, NULL, 0);



unlock:
@@ -737,6 +889,8 @@ static int set_service_cache(struct sock *sk, u16 index, unsigned char *data, 
	} else {

		clear_bit(HCI_SERVICE_CACHE, &hdev->flags);

		err = update_class(hdev);

		if (err == 0)

			err = update_eir(hdev);

	}



	if (err == 0)
@@ -1822,6 +1976,7 @@ int mgmt_auth_failed(u16 index, bdaddr_t *bdaddr, u8 status) 
int mgmt_set_local_name_complete(u16 index, u8 *name, u8 status)

{

	struct pending_cmd *cmd;

	struct hci_dev *hdev;

	struct mgmt_cp_set_local_name ev;

	int err;
@@ -1837,6 +1992,14 @@ int mgmt_set_local_name_complete(u16 index, u8 *name, u8 status) 
		goto failed;

	}



	hdev = hci_dev_get(index);

	if (hdev) {

		hci_dev_lock_bh(hdev);

		update_eir(hdev);

		hci_dev_unlock_bh(hdev);

		hci_dev_put(hdev);

	}



	err = cmd_complete(cmd->sk, index, MGMT_OP_SET_LOCAL_NAME, &ev,

								sizeof(ev));

	if (err < 0)