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Bluetooth: Change eir_has_data_type() to more generic eir_get_data()

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To make the EIR parsing helper more general purpose, make it return
the found data and its length rather than just saying whether the data
was present or not.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Johan Hedberg 2016-01-05 13:19:31 +02:00 committed by Marcel Holtmann
parent 29663b0cc1
commit 0d3b7f64c8
3 changed files with 25 additions and 14 deletions
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30
include/net/bluetooth/hci_core.h
View File

@ -1283,31 +1283,41 @@ static inline void hci_role_switch_cfm(struct hci_conn *conn, __u8 status,
mutex_unlock(&hci_cb_list_lock);
}
static inline bool eir_has_data_type(u8 *data, size_t data_len, u8 type)
static inline void *eir_get_data(u8 *eir, size_t eir_len, u8 type,
size_t *data_len)
{
size_t parsed = 0;
if (data_len < 2)
return false;
if (eir_len < 2)
return NULL;
while (parsed < data_len - 1) {
u8 field_len = data[0];
while (parsed < eir_len - 1) {
u8 field_len = eir[0];
if (field_len == 0)
break;
parsed += field_len + 1;
if (parsed > data_len)
if (parsed > eir_len)
break;
if (data[1] == type)
return true;
if (eir[1] != type) {
eir += field_len + 1;
continue;
}
data += field_len + 1;
/* Zero length data */
if (field_len == 1)
return NULL;
if (data_len)
*data_len = field_len - 1;
return &eir[2];
}
return false;
return NULL;
}
static inline bool hci_bdaddr_is_rpa(bdaddr_t *bdaddr, u8 addr_type)

6
net/bluetooth/hci_event.c
View File

@ -3833,9 +3833,9 @@ static void hci_extended_inquiry_result_evt(struct hci_dev *hdev,
data.ssp_mode = 0x01;
if (hci_dev_test_flag(hdev, HCI_MGMT))
name_known = eir_has_data_type(info->data,
sizeof(info->data),
EIR_NAME_COMPLETE);
name_known = eir_get_data(info->data,
sizeof(info->data),
EIR_NAME_COMPLETE, NULL);
else
name_known = true;

3
net/bluetooth/mgmt.c
View File

@ -7266,7 +7266,8 @@ void mgmt_device_found(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
/* Copy EIR or advertising data into event */
memcpy(ev->eir, eir, eir_len);
if (dev_class && !eir_has_data_type(ev->eir, eir_len, EIR_CLASS_OF_DEV))
if (dev_class && !eir_get_data(ev->eir, eir_len, EIR_CLASS_OF_DEV,
NULL))
eir_len = eir_append_data(ev->eir, eir_len, EIR_CLASS_OF_DEV,
dev_class, 3);