From 5192d30114771ac5956d750ec506dc574411cc70 Mon Sep 17 00:00:00 2001 From: Marcel Holtmann Date: Wed, 19 Feb 2014 17:11:58 -0800 Subject: [PATCH] Bluetooth: Add comment explainging store hint for long term keys The code itself is not descriptive on what store hint is used for long term keys and why. So add some extensive comment here. Similar to what has already been done for identity resolving key store hint. Signed-off-by: Marcel Holtmann Signed-off-by: Johan Hedberg --- net/bluetooth/mgmt.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c index e8b9d2f..5f5e388 100644 --- a/net/bluetooth/mgmt.c +++ b/net/bluetooth/mgmt.c @@ -4771,6 +4771,17 @@ void mgmt_new_ltk(struct hci_dev *hdev, struct smp_ltk *key) memset(&ev, 0, sizeof(ev)); + /* Devices using resolvable or non-resolvable random addresses + * without providing an indentity resolving key don't require + * to store long term keys. Their addresses will change the + * next time around. + * + * Only when a remote device provides an identity address + * make sure the long term key is stored. If the remote + * identity is known, the long term keys are internally + * mapped to the identity address. So allow static random + * and public addresses here. + */ if (key->bdaddr_type == ADDR_LE_DEV_RANDOM && (key->bdaddr.b[5] & 0xc0) != 0xc0) ev.store_hint = 0x00; -- 2.7.4