1 files changed, 85 insertions, 10 deletions

diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
index 7a6f56b2f49d..3163330cd4f1 100644
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -269,6 +269,19 @@ static void hci_conn_idle(unsigned long arg)
         hci_conn_enter_sniff_mode(conn);
 }
 
+static void hci_conn_auto_accept(unsigned long arg)
+{
+        struct hci_conn *conn = (void *) arg;
+        struct hci_dev *hdev = conn->hdev;
+
+        hci_dev_lock(hdev);
+
+        hci_send_cmd(hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst),
+                                                                &conn->dst);
+
+        hci_dev_unlock(hdev);
+}
+
 struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst)
 {
         struct hci_conn *conn;
@@ -287,6 +300,7 @@ struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst)
         conn->auth_type = HCI_AT_GENERAL_BONDING;
         conn->io_capability = hdev->io_capability;
         conn->remote_auth = 0xff;
+        conn->key_type = 0xff;
 
         conn->power_save = 1;
         conn->disc_timeout = HCI_DISCONN_TIMEOUT;
@@ -311,6 +325,8 @@ struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst)
 
         setup_timer(&conn->disc_timer, hci_conn_timeout, (unsigned long)conn);
         setup_timer(&conn->idle_timer, hci_conn_idle, (unsigned long)conn);
+        setup_timer(&conn->auto_accept_timer, hci_conn_auto_accept,
+                                                        (unsigned long) conn);
 
         atomic_set(&conn->refcnt, 0);
 
@@ -341,6 +357,8 @@ int hci_conn_del(struct hci_conn *conn)
 
         del_timer(&conn->disc_timer);
 
+        del_timer(&conn->auto_accept_timer);
+
         if (conn->type == ACL_LINK) {
                 struct hci_conn *sco = conn->link;
                 if (sco)
@@ -535,36 +553,93 @@ static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
         return 0;
 }
 
+/* Encrypt the the link */
+static void hci_conn_encrypt(struct hci_conn *conn)
+{
+        BT_DBG("conn %p", conn);
+
+        if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->pend)) {
+                struct hci_cp_set_conn_encrypt cp;
+                cp.handle  = cpu_to_le16(conn->handle);
+                cp.encrypt = 0x01;
+                hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
+                                                                        &cp);
+        }
+}
+
 /* Enable security */
 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
 {
         BT_DBG("conn %p", conn);
 
+        /* For sdp we don't need the link key. */
         if (sec_level == BT_SECURITY_SDP)
                 return 1;
 
+        /* For non 2.1 devices and low security level we don't need the link
+           key. */
         if (sec_level == BT_SECURITY_LOW &&
                                 (!conn->ssp_mode || !conn->hdev->ssp_mode))
                 return 1;
 
-        if (conn->link_mode & HCI_LM_ENCRYPT)
-                return hci_conn_auth(conn, sec_level, auth_type);
-
+        /* For other security levels we need the link key. */
+        if (!(conn->link_mode & HCI_LM_AUTH))
+                goto auth;
+
+        /* An authenticated combination key has sufficient security for any
+           security level. */
+        if (conn->key_type == HCI_LK_AUTH_COMBINATION)
+                goto encrypt;
+
+        /* An unauthenticated combination key has sufficient security for
+           security level 1 and 2. */
+        if (conn->key_type == HCI_LK_UNAUTH_COMBINATION &&
+                        (sec_level == BT_SECURITY_MEDIUM ||
+                        sec_level == BT_SECURITY_LOW))
+                goto encrypt;
+
+        /* A combination key has always sufficient security for the security
+           levels 1 or 2. High security level requires the combination key
+           is generated using maximum PIN code length (16).
+           For pre 2.1 units. */
+        if (conn->key_type == HCI_LK_COMBINATION &&
+                        (sec_level != BT_SECURITY_HIGH ||
+                        conn->pin_length == 16))
+                goto encrypt;
+
+auth:
         if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->pend))
                 return 0;
 
-        if (hci_conn_auth(conn, sec_level, auth_type)) {
-                struct hci_cp_set_conn_encrypt cp;
-                cp.handle  = cpu_to_le16(conn->handle);
-                cp.encrypt = 1;
-                hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT,
-                                                        sizeof(cp), &cp);
-        }
+        hci_conn_auth(conn, sec_level, auth_type);
+        return 0;
+
+encrypt:
+        if (conn->link_mode & HCI_LM_ENCRYPT)
+                return 1;
 
+        hci_conn_encrypt(conn);
         return 0;
 }
 EXPORT_SYMBOL(hci_conn_security);
 
+/* Check secure link requirement */
+int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
+{
+        BT_DBG("conn %p", conn);
+
+        if (sec_level != BT_SECURITY_HIGH)
+                return 1; /* Accept if non-secure is required */
+
+        if (conn->key_type == HCI_LK_AUTH_COMBINATION ||
+                        (conn->key_type == HCI_LK_COMBINATION &&
+                        conn->pin_length == 16))
+                return 1;
+
+        return 0; /* Reject not secure link */
+}
+EXPORT_SYMBOL(hci_conn_check_secure);
+
 /* Change link key */
 int hci_conn_change_link_key(struct hci_conn *conn)
 {