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Bluetooth: Fix append max 11 bytes of name to scan rsp data

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Append maximum of 10 + 1 bytes of name to scan response data.
Complete name is appended only if exists and is <= 10 characters.
Else append short name if exists or shorten complete name if not.
This makes sure name is consistent across multiple advertising
instances.

Signed-off-by: Michał Narajowski <michal.narajowski@codecoup.pl>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Michał Narajowski 2016-10-19 10:20:27 +02:00 committed by Marcel Holtmann
parent 5e2bd93b8f
commit f61851f64b
3 changed files with 43 additions and 36 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

51
net/bluetooth/hci_request.c
View file

@ -969,41 +969,38 @@ void __hci_req_enable_advertising(struct hci_request *req)
hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable), &enable);
}
static u8 append_local_name(struct hci_dev *hdev, u8 *ptr, u8 ad_len)
u8 append_local_name(struct hci_dev *hdev, u8 *ptr, u8 ad_len)
{
size_t complete_len;
size_t short_len;
int max_len;
size_t complete_len;
max_len = HCI_MAX_AD_LENGTH - ad_len - 2;
/* no space left for name (+ NULL + type + len) */
if ((HCI_MAX_AD_LENGTH - ad_len) < HCI_MAX_SHORT_NAME_LENGTH + 3)
return ad_len;
/* use complete name if present and fits */
complete_len = strlen(hdev->dev_name);
short_len = strlen(hdev->short_name);
/* no space left for name */
if (max_len < 1)
return ad_len;
/* no name set */
if (!complete_len)
return ad_len;
/* complete name fits and is eq to max short name len or smaller */
if (complete_len <= max_len &&
complete_len <= HCI_MAX_SHORT_NAME_LENGTH) {
if (complete_len && complete_len <= HCI_MAX_SHORT_NAME_LENGTH)
return eir_append_data(ptr, ad_len, EIR_NAME_COMPLETE,
hdev->dev_name, complete_len);
}
hdev->dev_name, complete_len + 1);
/* short name set and fits */
if (short_len && short_len <= max_len) {
/* use short name if present */
short_len = strlen(hdev->short_name);
if (short_len)
return eir_append_data(ptr, ad_len, EIR_NAME_SHORT,
hdev->short_name, short_len);
}
hdev->short_name, short_len + 1);
/* no short name set so shorten complete name */
if (!short_len) {
return eir_append_data(ptr, ad_len, EIR_NAME_SHORT,
hdev->dev_name, max_len);
/* use shortened full name if present, we already know that name
* is longer then HCI_MAX_SHORT_NAME_LENGTH
*/
if (complete_len) {
u8 name[HCI_MAX_SHORT_NAME_LENGTH + 1];
memcpy(name, hdev->dev_name, HCI_MAX_SHORT_NAME_LENGTH);
name[HCI_MAX_SHORT_NAME_LENGTH] = '\0';
return eir_append_data(ptr, ad_len, EIR_NAME_SHORT, name,
sizeof(name));
}
return ad_len;

2
net/bluetooth/hci_request.h
View file

@ -106,6 +106,8 @@ static inline void hci_update_background_scan(struct hci_dev *hdev)
void hci_request_setup(struct hci_dev *hdev);
void hci_request_cancel_all(struct hci_dev *hdev);
u8 append_local_name(struct hci_dev *hdev, u8 *ptr, u8 ad_len);
static inline u16 eir_append_data(u8 *eir, u16 eir_len, u8 type,
u8 *data, u8 data_len)
{

26
net/bluetooth/mgmt.c
View file

@ -6017,7 +6017,15 @@ static int read_adv_features(struct sock *sk, struct hci_dev *hdev,
return err;
}
static u8 tlv_data_max_len(u32 adv_flags, bool is_adv_data)
static u8 calculate_name_len(struct hci_dev *hdev)
{
u8 buf[HCI_MAX_SHORT_NAME_LENGTH + 3];
return append_local_name(hdev, buf, 0);
}
static u8 tlv_data_max_len(struct hci_dev *hdev, u32 adv_flags,
bool is_adv_data)
{
u8 max_len = HCI_MAX_AD_LENGTH;
@ -6030,9 +6038,8 @@ static u8 tlv_data_max_len(u32 adv_flags, bool is_adv_data)
if (adv_flags & MGMT_ADV_FLAG_TX_POWER)
max_len -= 3;
} else {
/* at least 1 byte of name should fit in */
if (adv_flags & MGMT_ADV_FLAG_LOCAL_NAME)
max_len -= 3;
max_len -= calculate_name_len(hdev);
if (adv_flags & (MGMT_ADV_FLAG_APPEARANCE))
max_len -= 4;
@ -6063,12 +6070,13 @@ static bool appearance_managed(u32 adv_flags)
return adv_flags & MGMT_ADV_FLAG_APPEARANCE;
}
static bool tlv_data_is_valid(u32 adv_flags, u8 *data, u8 len, bool is_adv_data)
static bool tlv_data_is_valid(struct hci_dev *hdev, u32 adv_flags, u8 *data,
u8 len, bool is_adv_data)
{
int i, cur_len;
u8 max_len;
max_len = tlv_data_max_len(adv_flags, is_adv_data);
max_len = tlv_data_max_len(hdev, adv_flags, is_adv_data);
if (len > max_len)
return false;
@ -6215,8 +6223,8 @@ static int add_advertising(struct sock *sk, struct hci_dev *hdev,
goto unlock;
}
if (!tlv_data_is_valid(flags, cp->data, cp->adv_data_len, true) ||
!tlv_data_is_valid(flags, cp->data + cp->adv_data_len,
if (!tlv_data_is_valid(hdev, flags, cp->data, cp->adv_data_len, true) ||
!tlv_data_is_valid(hdev, flags, cp->data + cp->adv_data_len,
cp->scan_rsp_len, false)) {
err = mgmt_cmd_status(sk, hdev->id, MGMT_OP_ADD_ADVERTISING,
MGMT_STATUS_INVALID_PARAMS);
@ -6429,8 +6437,8 @@ static int get_adv_size_info(struct sock *sk, struct hci_dev *hdev,
rp.instance = cp->instance;
rp.flags = cp->flags;
rp.max_adv_data_len = tlv_data_max_len(flags, true);
rp.max_scan_rsp_len = tlv_data_max_len(flags, false);
rp.max_adv_data_len = tlv_data_max_len(hdev, flags, true);
rp.max_scan_rsp_len = tlv_data_max_len(hdev, flags, false);
err = mgmt_cmd_complete(sk, hdev->id, MGMT_OP_GET_ADV_SIZE_INFO,
MGMT_STATUS_SUCCESS, &rp, sizeof(rp));