Bluetooth: Remove LTK re-encryption procedure
Due to several devices being unable to handle this procedure reliably
(resulting in forced disconnections before pairing completes) it's
better to remove it altogether.
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c
index b952041..10a8e62 100644
--- a/net/bluetooth/smp.c
+++ b/net/bluetooth/smp.c
@@ -556,20 +556,6 @@
smp_failure(conn, reason);
}
-static void smp_reencrypt(struct work_struct *work)
-{
- struct smp_chan *smp = container_of(work, struct smp_chan,
- reencrypt.work);
- struct l2cap_conn *conn = smp->conn;
- struct hci_conn *hcon = conn->hcon;
- struct smp_ltk *ltk = smp->ltk;
-
- BT_DBG("");
-
- hci_le_start_enc(hcon, ltk->ediv, ltk->rand, ltk->val);
- hcon->enc_key_size = ltk->enc_size;
-}
-
static struct smp_chan *smp_chan_create(struct l2cap_conn *conn)
{
struct smp_chan *smp;
@@ -580,7 +566,6 @@
INIT_WORK(&smp->confirm, confirm_work);
INIT_WORK(&smp->random, random_work);
- INIT_DELAYED_WORK(&smp->reencrypt, smp_reencrypt);
smp->conn = conn;
conn->smp_chan = smp;
@@ -598,8 +583,6 @@
BUG_ON(!smp);
- cancel_delayed_work_sync(&smp->reencrypt);
-
complete = test_bit(SMP_FLAG_COMPLETE, &smp->smp_flags);
mgmt_smp_complete(conn->hcon, complete);
@@ -1276,7 +1259,6 @@
struct smp_chan *smp = conn->smp_chan;
struct hci_conn *hcon = conn->hcon;
struct hci_dev *hdev = hcon->hdev;
- bool ltk_encrypt;
__u8 *keydist;
BT_DBG("conn %p", conn);
@@ -1376,32 +1358,12 @@
if ((smp->remote_key_dist & 0x07))
return 0;
- /* Check if we should try to re-encrypt the link with the LTK.
- * SMP_FLAG_LTK_ENCRYPT flag is used to track whether we've
- * already tried this (in which case we shouldn't try again).
- *
- * The request will trigger an encryption key refresh event
- * which will cause a call to auth_cfm and eventually lead to
- * l2cap_core.c calling this smp_distribute_keys function again
- * and thereby completing the process.
- */
- if (smp->ltk)
- ltk_encrypt = !test_and_set_bit(SMP_FLAG_LTK_ENCRYPT,
- &smp->smp_flags);
- else
- ltk_encrypt = false;
+ clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags);
+ cancel_delayed_work_sync(&conn->security_timer);
+ set_bit(SMP_FLAG_COMPLETE, &smp->smp_flags);
+ smp_notify_keys(conn);
- /* Re-encrypt the link with LTK if possible */
- if (ltk_encrypt && hcon->out) {
- queue_delayed_work(hdev->req_workqueue, &smp->reencrypt,
- SMP_REENCRYPT_TIMEOUT);
- } else {
- clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags);
- cancel_delayed_work_sync(&conn->security_timer);
- set_bit(SMP_FLAG_COMPLETE, &smp->smp_flags);
- smp_notify_keys(conn);
- smp_chan_destroy(conn);
- }
+ smp_chan_destroy(conn);
return 0;
}