Re: [PATCH v2 08/12] Bluetooth: Use the stored LTK for restabilishing security

["Gustavo F. Padovan" <padovan@profusion.mobi>]

* Vinicius Costa Gomes <vinicius.gomes@openbossa.org> [2011-07-01 16:07:43 -0300]:

> 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 <vinicius.gomes@openbossa.org>
> ---
>  net/bluetooth/smp.c |   15 +++++++++++++++
>  1 files changed, 15 insertions(+), 0 deletions(-)
> 
> diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c
> index 34d236d..191aaec 100644
> --- a/net/bluetooth/smp.c
> +++ b/net/bluetooth/smp.c
> @@ -476,6 +476,20 @@ int smp_conn_security(struct l2cap_conn *conn, __u8 sec_level)
>  	authreq = seclevel_to_authreq(sec_level);
>  
>  	if (hcon->link_mode & HCI_LM_MASTER) {
> +		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;
> +		}
> +	}
> +
> +	if (hcon->link_mode & HCI_LM_MASTER) {

hey, why do you need this if? it is the same comparison as above.

	Gustavo