Bluetooth: Add management command for setting static address

On dual-mode BR/EDR/LE and LE only controllers it is possible
to configure a random address. There are two types or random
addresses, one is static and the other private. Since the
random private addresses require special privacy feature to
be supported, the configuration of these two are kept separate.

This command allows for setting the static random address. It is
only supported on controllers with LE support. The static random
address is suppose to be valid for the lifetime of the controller
or at least until the next power cycle. To ensure such behavior,
setting of the address is limited to when the controller is
powered off.

The special BDADDR_ANY address (00:00:00:00:00:00) can be used to
disable the static address. This is also the default value.

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

4 files changed, 58 insertions, 0 deletions

diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index 4fa08d7b997d..d7fd825ed2ce 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -978,6 +978,8 @@ struct hci_rp_le_read_local_features {
         __u8     features[8];
 } __packed;
 
+#define HCI_OP_LE_SET_RANDOM_ADDR       0x2005
+
 #define HCI_OP_LE_READ_ADV_TX_POWER     0x2007
 struct hci_rp_le_read_adv_tx_power {
         __u8    status;
diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 26cc9f7858cd..e09c30577b3a 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -140,6 +140,7 @@ struct hci_dev {
         __u8            bus;
         __u8            dev_type;
         bdaddr_t        bdaddr;
+        bdaddr_t        static_addr;
         __u8            dev_name[HCI_MAX_NAME_LENGTH];
         __u8            short_name[HCI_MAX_SHORT_NAME_LENGTH];
         __u8            eir[HCI_MAX_EIR_LENGTH];
diff --git a/include/net/bluetooth/mgmt.h b/include/net/bluetooth/mgmt.h
index 7347df800a2e..2ad433bb9a2e 100644
--- a/include/net/bluetooth/mgmt.h
+++ b/include/net/bluetooth/mgmt.h
@@ -356,6 +356,12 @@ struct mgmt_cp_set_device_id {
 
 #define MGMT_OP_SET_BREDR               0x002A
 
+#define MGMT_OP_SET_STATIC_ADDRESS      0x002B
+struct mgmt_cp_set_static_address {
+        bdaddr_t bdaddr;
+} __packed;
+#define MGMT_SET_STATIC_ADDRESS_SIZE    6
+
 #define MGMT_EV_CMD_COMPLETE            0x0001
 struct mgmt_ev_cmd_complete {
         __le16  opcode;
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 4ac31695946b..b87163238c10 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -76,6 +76,7 @@ static const u16 mgmt_commands[] = {
         MGMT_OP_SET_DEVICE_ID,
         MGMT_OP_SET_ADVERTISING,
         MGMT_OP_SET_BREDR,
+        MGMT_OP_SET_STATIC_ADDRESS,
 };
 
 static const u16 mgmt_events[] = {
@@ -3247,6 +3248,46 @@ unlock:
         return err;
 }
 
+static int set_static_address(struct sock *sk, struct hci_dev *hdev,
+                              void *data, u16 len)
+{
+        struct mgmt_cp_set_static_address *cp = data;
+        int err;
+
+        BT_DBG("%s", hdev->name);
+
+        if (!lmp_le_capable(hdev))
+                return cmd_status(sk, hdev->id, MGMT_OP_SET_STATIC_ADDRESS,
+                                  MGMT_STATUS_NOT_SUPPORTED);
+
+        if (hdev_is_powered(hdev))
+                return cmd_status(sk, hdev->id, MGMT_OP_SET_STATIC_ADDRESS,
+                                  MGMT_STATUS_REJECTED);
+
+        if (bacmp(&cp->bdaddr, BDADDR_ANY)) {
+                if (!bacmp(&cp->bdaddr, BDADDR_NONE))
+                        return cmd_status(sk, hdev->id,
+                                          MGMT_OP_SET_STATIC_ADDRESS,
+                                          MGMT_STATUS_INVALID_PARAMS);
+
+                /* Two most significant bits shall be set */
+                if ((cp->bdaddr.b[5] & 0xc0) != 0xc0)
+                        return cmd_status(sk, hdev->id,
+                                          MGMT_OP_SET_STATIC_ADDRESS,
+                                          MGMT_STATUS_INVALID_PARAMS);
+        }
+
+        hci_dev_lock(hdev);
+
+        bacpy(&hdev->static_addr, &cp->bdaddr);
+
+        err = cmd_complete(sk, hdev->id, MGMT_OP_SET_STATIC_ADDRESS, 0, NULL, 0);
+
+        hci_dev_unlock(hdev);
+
+        return err;
+}
+
 static void fast_connectable_complete(struct hci_dev *hdev, u8 status)
 {
         struct pending_cmd *cmd;
@@ -3576,6 +3617,7 @@ static const struct mgmt_handler {
         { set_device_id,          false, MGMT_SET_DEVICE_ID_SIZE },
         { set_advertising,        false, MGMT_SETTING_SIZE },
         { set_bredr,              false, MGMT_SETTING_SIZE },
+        { set_static_address,     false, MGMT_SET_STATIC_ADDRESS_SIZE },
 };
 
 
@@ -3762,6 +3804,13 @@ static int powered_update_hci(struct hci_dev *hdev)
                 hci_update_ad(&req);
         }
 
+        if (lmp_le_capable(hdev)) {
+                /* Set random address to static address if configured */
+                if (bacmp(&hdev->static_addr, BDADDR_ANY))
+                        hci_req_add(&req, HCI_OP_LE_SET_RANDOM_ADDR, 6,
+                                    &hdev->static_addr);
+        }
+
         if (test_bit(HCI_LE_PERIPHERAL, &hdev->dev_flags)) {
                 u8 adv = 0x01;