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Subject: RE: RE: Re: Mesh Key Refreshment procedure from Config client
Reply-To: anupam.r@samsung.com
From:   Anupam Roy <anupam.r@samsung.com>
To:     "Stotland, Inga" <inga.stotland@intel.com>
CC:     "linux-bluetooth@vger.kernel.org" <linux-bluetooth@vger.kernel.org>,
        Dohyun Pyun <dh79.pyun@samsung.com>,
        Semun Lee <semun.lee@samsung.com>,
        AMIT KUMAR JAISWAL <amit.jaiswal@samsung.com>,
        Nitin Jhanwar <nitin.j@samsung.com>
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Date:   Fri, 27 Mar 2020 19:17:42 +0530
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Hi Inga,

>--------- Original Message ---------
>Sender : Anupam Roy <anupam.r@samsung.com> Staff Engineer/Application S/W Group /SRI-Delhi/Samsung Electronics
>Date : 2020-03-27 11:07 (GMT+5:30)
>Title : RE: Re: Mesh Key Refreshment procedure from Config client
> 
>Hi Inga,
> 
>> 
>>Hi Anupam,
>> 
>>On Thu, 2020-03-26 at 20:22 +0530, Anupam Roy wrote:
>>> Hi ,
>>>  Presently, I am trying to check *Key Refreshment Procedure* from Mesh Config client.
>>> 
>>> For checking the operation, I did following steps
>>>  - Create Subnet in Config client at Net index 1
>>>  - Add SubNetKey to Local Node at Net Index 1
>>>  - Add SubNetKey to Remote Node at Net Index 1
>>> 
>> 
>>Please try to add two steps more here:
>>   - Update Subnet 1 (subnet-update command in main menu)
>I missed mentioning above step in my email. Actually, before updating netkey to remote, I did update local subnet.
>But yes, I missed out below step (Updating netkey to local node). Will give it a try now. Much thanks!
>

After updating the Netkey to the local node(config client) and then to the remote node, I monitored the beaconing key used by local config client.
Please note that since, only two netkeys are at presently configured in both the nodes, therefore, the key ID's are 1 (for primary netkey at index 0), 2(For Netkey at index 1) & 3(For new NetKey at index 1).

After NetKey update, The KR phase in both sides are set to 1, but it seems, the new key id (which is 3 in this case) is still *NOT used for beaconing, by the 'Config Client node'
Config Client still keeps on beaconing with key ID 1 & 2. Sharing a bit of logs for your reference.

During NetKey Update-
mesh/cfgmod-server.c:cfg_srv_pkt() CONFIG-SRV-opcode 0x8045 size 18 idx 000
key refresh phase 1: Key ID 3

Beacon Keys after NetKey update on remote Node -
mesh/net-keys.c:snb_timeout() beacon 2 for 1 nodes, period 30, obs 2, exp 3
mesh/net-keys.c:snb_timeout() beacon 1 for 1 nodes, period 20, obs 2, exp 2

Please share your opinion to check the issue further. Thank You
 
>>   - Update NetKey 1 for a local node (switch to config menu)
>> 
>>>  - Update Netkey to remote Node in Net index 1
>>> 
>>> After updating the Netkey, I believe, config client has to either send out SNB with KeyRefreshment(KR) Flag=1 & secured with updated NetKey (i.e by subnet->net_key_upd id)
>>> or send out "Config Key Refresh Phase Set" with transition parameter, set to 2. I could not find the later provision in cfgclient menu.
>>> However, Config Client seems to be not sending out Secure Network Beacon as well. So KR procedure seems to be not progressing at my setup at present.
>>> 
>>> Any hint of what could be missing will be really helpful! Thank You.
>>> 
>> 
>>Best Regards,
>>Inga

BR,
-Anupam Roy