Bluetooth: Add smp_ltk_sec_level() helper function

There are several places that need to determine the security level that
an LTK can provide. This patch adds a convenience function for this to
help make the code more readable.

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

3 files changed, 10 insertions, 5 deletions

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 3a8381ab992f..603a17cc52ac 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -4506,10 +4506,7 @@ static void hci_le_ltk_request_evt(struct hci_dev *hdev, struct sk_buff *skb)
         memcpy(cp.ltk, ltk->val, sizeof(ltk->val));
         cp.handle = cpu_to_le16(conn->handle);
 
-        if (ltk->authenticated)
-                conn->pending_sec_level = BT_SECURITY_HIGH;
-        else
-                conn->pending_sec_level = BT_SECURITY_MEDIUM;
+        conn->pending_sec_level = smp_ltk_sec_level(ltk);
 
         conn->enc_key_size = ltk->enc_size;
 
diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c
index a08b077cb725..3700dd8d9d0b 100644
--- a/net/bluetooth/smp.c
+++ b/net/bluetooth/smp.c
@@ -1114,7 +1114,7 @@ static bool smp_ltk_encrypt(struct l2cap_conn *conn, u8 sec_level)
         if (!key)
                 return false;
 
-        if (sec_level > BT_SECURITY_MEDIUM && !key->authenticated)
+        if (smp_ltk_sec_level(key) < sec_level)
                 return false;
 
         if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags))
diff --git a/net/bluetooth/smp.h b/net/bluetooth/smp.h
index 5240537efde3..86a683a8b491 100644
--- a/net/bluetooth/smp.h
+++ b/net/bluetooth/smp.h
@@ -125,6 +125,14 @@ enum {
         SMP_LTK_SLAVE,
 };
 
+static inline u8 smp_ltk_sec_level(struct smp_ltk *key)
+{
+        if (key->authenticated)
+                return BT_SECURITY_HIGH;
+
+        return BT_SECURITY_MEDIUM;
+}
+
 /* SMP Commands */
 bool smp_sufficient_security(struct hci_conn *hcon, u8 sec_level);
 int smp_conn_security(struct hci_conn *hcon, __u8 sec_level);