Bluetooth: Advertising entries lifetime

This patch adds a timer to clear 'adv_entries' after three minutes.

After some amount of time, the advertising entries cached during
the last LE scan should be considered expired and they should be
removed from the advertising cache.

It was chosen a three minutes timeout as an initial attempt. This
value might change in future.

Signed-off-by: Andre Guedes <andre.guedes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

3 files changed, 21 insertions, 1 deletions

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 10dfb85ad6a1..af4b0ed173a8 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -188,6 +188,7 @@ struct hci_dev {
         struct list_head        remote_oob_data;
 
         struct list_head        adv_entries;
+        struct timer_list       adv_timer;
 
         struct hci_dev_stats    stat;
 
@@ -535,6 +536,7 @@ int hci_add_remote_oob_data(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 *hash,
                                                                 u8 *randomizer);
 int hci_remove_remote_oob_data(struct hci_dev *hdev, bdaddr_t *bdaddr);
 
+#define ADV_CLEAR_TIMEOUT (3*60*HZ) /* Three minutes */
 int hci_adv_entries_clear(struct hci_dev *hdev);
 struct adv_entry *hci_find_adv_entry(struct hci_dev *hdev, bdaddr_t *bdaddr);
 int hci_add_adv_entry(struct hci_dev *hdev,
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index cc40f221f5e7..ff6b784c58c5 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -1202,6 +1202,17 @@ int hci_add_remote_oob_data(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 *hash,
         return 0;
 }
 
+static void hci_clear_adv_cache(unsigned long arg)
+{
+        struct hci_dev *hdev = (void *) arg;
+
+        hci_dev_lock(hdev);
+
+        hci_adv_entries_clear(hdev);
+
+        hci_dev_unlock(hdev);
+}
+
 int hci_adv_entries_clear(struct hci_dev *hdev)
 {
         struct adv_entry *entry, *tmp;
@@ -1330,6 +1341,8 @@ int hci_register_dev(struct hci_dev *hdev)
         INIT_LIST_HEAD(&hdev->remote_oob_data);
 
         INIT_LIST_HEAD(&hdev->adv_entries);
+        setup_timer(&hdev->adv_timer, hci_clear_adv_cache,
+                                                (unsigned long) hdev);
 
         INIT_WORK(&hdev->power_on, hci_power_on);
         INIT_WORK(&hdev->power_off, hci_power_off);
@@ -1403,6 +1416,7 @@ int hci_unregister_dev(struct hci_dev *hdev)
         hci_unregister_sysfs(hdev);
 
         hci_del_off_timer(hdev);
+        del_timer(&hdev->adv_timer);
 
         destroy_workqueue(hdev->workqueue);
 
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 056f7b2fa02f..a90200cac11d 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -856,8 +856,12 @@ static void hci_cc_le_set_scan_enable(struct hci_dev *hdev,
 
         hci_dev_lock(hdev);
 
-        if (cp->enable == 0x01)
+        if (cp->enable == 0x01) {
+                del_timer(&hdev->adv_timer);
                 hci_adv_entries_clear(hdev);
+        } else if (cp->enable == 0x00) {
+                mod_timer(&hdev->adv_timer, jiffies + ADV_CLEAR_TIMEOUT);
+        }
 
         hci_dev_unlock(hdev);
 }