Bluetooth: Add timer for regenerating local RPA

This patch adds a timer for updating the local RPA periodically. The
default timeout is set to 15 minutes.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index 5ff885f..1bb45a4 100644 (file)
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -127,6 +127,7 @@ enum {
        HCI_SC_ENABLED,
        HCI_SC_ONLY,
        HCI_PRIVACY,
+       HCI_RPA_EXPIRED,
        HCI_RPA_RESOLVING,
        HCI_HS_ENABLED,
        HCI_LE_ENABLED,

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 68bbcab..6415514 100644 (file)
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -130,6 +130,9 @@ struct oob_data {
 
 #define HCI_MAX_SHORT_NAME_LENGTH      10
 
+/* Default LE RPA expiry time, 15 minutes */
+#define HCI_DEFAULT_RPA_TIMEOUT                (15 * 60)
+
 struct amp_assoc {
        __u16   len;
        __u16   offset;
@@ -304,6 +307,8 @@ struct hci_dev {
        __u8                    scan_rsp_data_len;
 
        __u8                    irk[16];
+       __u32                   rpa_timeout;
+       struct delayed_work     rpa_expired;
 
        int (*open)(struct hci_dev *hdev);
        int (*close)(struct hci_dev *hdev);

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 964aa8d..92d3581 100644 (file)
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -2102,6 +2102,7 @@ static int hci_dev_do_open(struct hci_dev *hdev)
 
        if (!ret) {
                hci_dev_hold(hdev);
+               set_bit(HCI_RPA_EXPIRED, &hdev->dev_flags);
                set_bit(HCI_UP, &hdev->flags);
                hci_notify(hdev, HCI_DEV_UP);
                if (!test_bit(HCI_SETUP, &hdev->dev_flags) &&
@@ -2199,6 +2200,7 @@ static int hci_dev_do_close(struct hci_dev *hdev)
                cancel_delayed_work(&hdev->service_cache);
 
        cancel_delayed_work_sync(&hdev->le_scan_disable);
+       cancel_delayed_work_sync(&hdev->rpa_expired);
 
        hci_dev_lock(hdev);
        hci_inquiry_cache_flush(hdev);
@@ -3300,6 +3302,8 @@ struct hci_dev *hci_alloc_dev(void)
        hdev->le_conn_min_interval = 0x0028;
        hdev->le_conn_max_interval = 0x0038;
 
+       hdev->rpa_timeout = HCI_DEFAULT_RPA_TIMEOUT;
+
        mutex_init(&hdev->lock);
        mutex_init(&hdev->req_lock);
 

diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 301b18a..4522da1 100644 (file)
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -881,12 +881,39 @@ static void service_cache_off(struct work_struct *work)
        hci_req_run(&req, NULL);
 }
 
+static void rpa_expired(struct work_struct *work)
+{
+       struct hci_dev *hdev = container_of(work, struct hci_dev,
+                                           rpa_expired.work);
+       struct hci_request req;
+
+       BT_DBG("");
+
+       set_bit(HCI_RPA_EXPIRED, &hdev->dev_flags);
+
+       if (!test_bit(HCI_ADVERTISING, &hdev->dev_flags) ||
+           hci_conn_num(hdev, LE_LINK) > 0)
+               return;
+
+       /* The generation of a new RPA and programming it into the
+        * controller happens in the enable_advertising() function.
+        */
+
+       hci_req_init(&req, hdev);
+
+       disable_advertising(&req);
+       enable_advertising(&req);
+
+       hci_req_run(&req, NULL);
+}
+
 static void mgmt_init_hdev(struct sock *sk, struct hci_dev *hdev)
 {
        if (test_and_set_bit(HCI_MGMT, &hdev->dev_flags))
                return;
 
        INIT_DELAYED_WORK(&hdev->service_cache, service_cache_off);
+       INIT_DELAYED_WORK(&hdev->rpa_expired, rpa_expired);
 
        /* Non-mgmt controlled devices get this bit set
         * implicitly so that pairing works for them, however