From cecbf3e932c1fa6df45fd6cc4fc8081a4cb45bcd Mon Sep 17 00:00:00 2001
From: Michał Narajowski <michal.narajowski@codecoup.pl>
Date: Wed, 5 Oct 2016 12:28:25 +0200
Subject: Bluetooth: Fix local name in scan rsp
MIME-Version: 1.0
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Use complete name if it fits. If not and there is short name
check if it fits. If not then use shortened name as prefix
of complete name.
Signed-off-by: Michał Narajowski <michal.narajowski@codecoup.pl>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
---
net/bluetooth/hci_request.c | 47 +++++++++++++++++++++++++++++++++------------
1 file changed, 35 insertions(+), 12 deletions(-)
(limited to 'net/bluetooth/hci_request.c')
diff --git a/net/bluetooth/hci_request.c b/net/bluetooth/hci_request.c
index c8135680c43e..fd6406df8a07 100644
--- a/net/bluetooth/hci_request.c
+++ b/net/bluetooth/hci_request.c
@@ -973,25 +973,48 @@ void __hci_req_enable_advertising(struct hci_request *req)
static u8 append_local_name(struct hci_dev *hdev, u8 *ptr, u8 ad_len)
{
- size_t name_len;
+ size_t complete_len;
+ size_t short_len;
int max_len;
max_len = HCI_MAX_AD_LENGTH - ad_len - 2;
- name_len = strlen(hdev->dev_name);
- if (name_len > 0 && max_len > 0) {
+ complete_len = strlen(hdev->dev_name);
+ short_len = strlen(hdev->short_name);
- if (name_len > max_len) {
- name_len = max_len;
- ptr[1] = EIR_NAME_SHORT;
- } else
- ptr[1] = EIR_NAME_COMPLETE;
+ /* no space left for name */
+ if (max_len < 1)
+ return ad_len;
- ptr[0] = name_len + 1;
+ /* no name set */
+ if (!complete_len)
+ return ad_len;
- memcpy(ptr + 2, hdev->dev_name, name_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) {
+ ptr[0] = complete_len + 1;
+ ptr[1] = EIR_NAME_COMPLETE;
+ memcpy(ptr + 2, hdev->dev_name, complete_len);
- ad_len += (name_len + 2);
- ptr += (name_len + 2);
+ return ad_len + complete_len + 2;
+ }
+
+ /* short name set and fits */
+ if (short_len && short_len <= max_len) {
+ ptr[0] = short_len + 1;
+ ptr[1] = EIR_NAME_SHORT;
+ memcpy(ptr + 2, hdev->short_name, short_len);
+
+ return ad_len + short_len + 2;
+ }
+
+ /* no short name set so shorten complete name */
+ if (!short_len) {
+ ptr[0] = max_len + 1;
+ ptr[1] = EIR_NAME_SHORT;
+ memcpy(ptr + 2, hdev->dev_name, max_len);
+
+ return ad_len + max_len + 2;
}
return ad_len;
--
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