From 5d873cafa53676fa7bf652bf653ea9dd4b14a7ed Mon Sep 17 00:00:00 2001 From: Vinicius Costa Gomes Date: Thu, 7 Jul 2011 18:59:41 -0300 Subject: [PATCH 453/696] Bluetooth: Use the stored LTK for restabilishing security Now that it's possible that the exchanged key is present in the link key list, we may be able to estabilish security with an already existing key, without need to perform any SMP procedure. Signed-off-by: Vinicius Costa Gomes Signed-off-by: Gustavo F. Padovan --- net/bluetooth/smp.c | 12 ++++++++++++ 1 files changed, 12 insertions(+), 0 deletions(-) diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c index 6df5101..5b72179 100644 --- a/net/bluetooth/smp.c +++ b/net/bluetooth/smp.c @@ -480,6 +480,17 @@ int smp_conn_security(struct l2cap_conn *conn, __u8 sec_level) if (hcon->link_mode & HCI_LM_MASTER) { struct smp_cmd_pairing cp; + struct link_key *key; + + key = hci_find_link_key_type(hcon->hdev, conn->dst, + HCI_LK_SMP_LTK); + if (key) { + struct key_master_id *master = (void *) key->data; + + hci_le_start_enc(hcon, master->ediv, master->rand, + key->val); + goto done; + } build_pairing_cmd(conn, &cp, NULL, authreq); conn->preq[0] = SMP_CMD_PAIRING_REQ; @@ -495,6 +506,7 @@ int smp_conn_security(struct l2cap_conn *conn, __u8 sec_level) smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp); } +done: hcon->pending_sec_level = sec_level; set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->pend); -- 1.7.1