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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
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51
net/bluetooth/hci_request.c
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@@ -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;