linux-kernel - Re: [PATCH v1] Bluetooth: send proper config param to unknown config request

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Date:   Fri, 25 Sep 2020 18:11:27 +0200
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Archie Pusaka <apusaka@...gle.com>
Cc:     linux-bluetooth <linux-bluetooth@...r.kernel.org>,
        CrosBT Upstreaming <chromeos-bluetooth-upstreaming@...omium.org>,
        Archie Pusaka <apusaka@...omium.org>,
        Alain Michaud <alainm@...omium.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        open list <linux-kernel@...r.kernel.org>,
        netdev@...r.kernel.org
Subject: Re: [PATCH v1] Bluetooth: send proper config param to unknown config
 request

Hi Archie,

> When receiving an L2CAP_CONFIGURATION_REQ with an unknown config
> type, currently we will reply with L2CAP_CONFIGURATION_RSP with
> a list of unknown types as the config param. However, this is not
> a correct format of config param.
> 
> As described in the bluetooth spec v5.2, Vol 3, Part A, Sec 5,
> the config param should consists of type, length, and optionally
> data.
> 
> This patch copies the length and data from the received
> L2CAP_CONFIGURATION_REQ and also appends them to the config param
> of the corresponding L2CAP_CONFIGURATION_RSP to match the format
> of the config param according to the spec.

any chance you could add btmon traces to the commit message to show the wrong behavior?

Regards

Marcel