Commit d5bb334a authored by Marcel Holtmann's avatar Marcel Holtmann Committed by Johan Hedberg

Bluetooth: Align minimum encryption key size for LE and BR/EDR connections

The minimum encryption key size for LE connections is 56 bits and to
align LE with BR/EDR, enforce 56 bits of minimum encryption key size for
BR/EDR connections as well.
Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: default avatarJohan Hedberg <johan.hedberg@intel.com>
Cc: stable@vger.kernel.org
parent e668eb1e
...@@ -190,6 +190,9 @@ struct adv_info { ...@@ -190,6 +190,9 @@ struct adv_info {
#define HCI_MAX_SHORT_NAME_LENGTH 10 #define HCI_MAX_SHORT_NAME_LENGTH 10
/* Min encryption key size to match with SMP */
#define HCI_MIN_ENC_KEY_SIZE 7
/* Default LE RPA expiry time, 15 minutes */ /* Default LE RPA expiry time, 15 minutes */
#define HCI_DEFAULT_RPA_TIMEOUT (15 * 60) #define HCI_DEFAULT_RPA_TIMEOUT (15 * 60)
......
...@@ -1276,6 +1276,14 @@ int hci_conn_check_link_mode(struct hci_conn *conn) ...@@ -1276,6 +1276,14 @@ int hci_conn_check_link_mode(struct hci_conn *conn)
!test_bit(HCI_CONN_ENCRYPT, &conn->flags)) !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
return 0; return 0;
/* The minimum encryption key size needs to be enforced by the
* host stack before establishing any L2CAP connections. The
* specification in theory allows a minimum of 1, but to align
* BR/EDR and LE transports, a minimum of 7 is chosen.
*/
if (conn->enc_key_size < HCI_MIN_ENC_KEY_SIZE)
return 0;
return 1; return 1;
} }
......
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