Bluetooth: Add initial code for distributing local IRK

This code adds a HCI_PRIVACY flag to track whether Privacy support is
enabled (meaning we have a local IRK) and makes sure the IRK is
distributed during SMP key distribution in case this flag is set.

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

3 files changed, 7 insertions, 2 deletions

diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index fe4b06bfc150..5ff885ff29df 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -126,6 +126,7 @@ enum {
         HCI_SSP_ENABLED,
         HCI_SC_ENABLED,
         HCI_SC_ONLY,
+        HCI_PRIVACY,
         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 c0fcc041fbb5..68bbcabdd9fd 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -303,6 +303,8 @@ struct hci_dev {
         __u8                    scan_rsp_data[HCI_MAX_AD_LENGTH];
         __u8                    scan_rsp_data_len;
 
+        __u8                    irk[16];
+
         int (*open)(struct hci_dev *hdev);
         int (*close)(struct hci_dev *hdev);
         int (*flush)(struct hci_dev *hdev);
diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c
index 6355a460e9d0..8ef50c790b96 100644
--- a/net/bluetooth/smp.c
+++ b/net/bluetooth/smp.c
@@ -265,6 +265,9 @@ static void build_pairing_cmd(struct l2cap_conn *conn,
         if (test_bit(HCI_RPA_RESOLVING, &hdev->dev_flags))
                 remote_dist |= SMP_DIST_ID_KEY;
 
+        if (test_bit(HCI_PRIVACY, &hdev->dev_flags))
+                local_dist |= SMP_DIST_ID_KEY;
+
         if (rsp == NULL) {
                 req->io_capability = conn->hcon->io_capability;
                 req->oob_flag = SMP_OOB_NOT_PRESENT;
@@ -1189,8 +1192,7 @@ int smp_distribute_keys(struct l2cap_conn *conn, __u8 force)
                 struct smp_cmd_ident_addr_info addrinfo;
                 struct smp_cmd_ident_info idinfo;
 
-                /* Send a dummy key */
-                get_random_bytes(idinfo.irk, sizeof(idinfo.irk));
+                memcpy(idinfo.irk, hdev->irk, sizeof(idinfo.irk));
 
                 smp_send_cmd(conn, SMP_CMD_IDENT_INFO, sizeof(idinfo), &idinfo);