From: Frédéric Dalleau Date: Mon, 19 Aug 2013 12:24:01 +0000 (+0200) Subject: Bluetooth: Prevent transparent SCO on older devices X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=79dc0087c33f06a8c35d8c9e37ea6307b790bc4c;p=linux-beck.git Bluetooth: Prevent transparent SCO on older devices Older Bluetooth devices may not support Setup Synchronous Connection or SCO transparent data. This is indicated by the corresponding LMP feature bits. It is not possible to know if the adapter support these features before setting BT_VOICE option since the socket is not bound to an adapter. An adapter can also be added after the socket is created. The socket can be bound to an address before adapter is plugged in. Thus, on a such adapters, if user request BT_VOICE_TRANSPARENT, outgoing connections fail on connect() and returns -EOPNOTSUPP. Incoming connections do not fail. However, they should only be allowed depending on what was specified in Write_Voice_Settings command. EOPNOTSUPP is choosen because connect() system call is failing after selecting route but before any connection attempt. Signed-off-by: Frédéric Dalleau Signed-off-by: Johan Hedberg Acked-by: Marcel Holtmann Signed-off-by: Gustavo Padovan --- diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c index ed581b41e034..96bd388d93a4 100644 --- a/net/bluetooth/sco.c +++ b/net/bluetooth/sco.c @@ -176,6 +176,12 @@ static int sco_connect(struct sock *sk) else type = SCO_LINK; + if (sco_pi(sk)->setting == BT_VOICE_TRANSPARENT && + (!lmp_transp_capable(hdev) || !lmp_esco_capable(hdev))) { + err = -EOPNOTSUPP; + goto done; + } + hcon = hci_connect_sco(hdev, type, dst, sco_pi(sk)->setting); if (IS_ERR(hcon)) { err = PTR_ERR(hcon);