Re: [Bluez-devel] Link Mode

[Marcel Holtmann <marcel@holtmann.org>]

Hi Iain,

>    I am trying to write a compatible equivalent to the Link Mode socket
> options API for NetBSD, and I wonder if somebody can clarify some things
> for me since I can't find any documentation about this.
> 
> I assume that RFCOMM_LM and L2CAP_LM are essentially the same, the
> following bits are defined:

from a bitwise perspective they are even the same as HCI_LM. The
different prefix is only exists to make the programs more cleanly.

> _LM_MASTER
> 	means we prefer to be master of the baseband link

It actually comes down to the HCI_Create_Connection command. This one
has a flag to indicate if a role-switch is allowed or not.

> _LM_AUTH
> 	means we want the baseband link to be authenticated

It means that a HCI_Authentication_Requested must succeed.

> _LM_ENCRYPT
> 	means we want the baseband link to be encrypted

It means that a HCI_Set_Encryption must be used to enable the
encryption.

> _LM_TRUSTED
> 	this seems unused, is there an intention?

Actually I can't remember what this was supposed to do. I think it
should be indicate that the device must be marked as trusted before
allowing a connection. However there is no way at the moment to mark a
device as trusted.

> _LM_RELIABLE
> 	signal error on unreliable link (means disconnect?)

It is basically only used in L2CAP to detect wrong ACL packets. This was
needed for the Bluetooth qualification testing.

> _LM_SECURE
> 	is this somehow different than (_LM_AUTH | _LM_ENCRYPT)?

It is authentication + encryption and on a successful connect at that
protocol level, it will also issue a HCI_Change_Connection_Link_Key.

Regards

Marcel



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