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Bluetooth: Add local Extended Inquiry Response (EIR) support

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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: Johan Hedberg <johan.hedberg@nokia.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
This commit is contained in:
Johan Hedberg 2011-03-28 14:07:23 +03:00 committed by Gustavo F. Padovan
parent e90165be9a
commit 80a1e1dbf6
3 changed files with 172 additions and 0 deletions
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8
include/net/bluetooth/hci.h
View file

@ -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;

1
include/net/bluetooth/hci_core.h
View file

@ -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;

163
net/bluetooth/mgmt.c
View file

@ -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)