bits 10 to 15 in OGM packets

bits 10 to 15 in OGM packets

[Rahul Bothra]

Hi,

I was going through the Internet Draft for B.A.T.M.A.N, and wanted to
confirm if the bits 10 to 15 in the OGM packet are supposed to be all
zeroes always?

Thanks

Re: bits 10 to 15 in OGM packets

[Sven Eckelmann]

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On Thursday, 25 June 2020 15:22:46 CEST Rahul Bothra wrote:
> I was going through the Internet Draft for B.A.T.M.A.N, and wanted to
> confirm if the bits 10 to 15 in the OGM packet are supposed to be all
> zeroes always?

Please don't implement the legacy draft which was never finished. This is 
really, really, really, really, really, really, really, really, really, 
really, really, really, really, really, really, really, really, really, 
really, really, really, really, really, really, really, really, really, 
really, really, really, really, really, really, really, really, really, 
really, really, really, really, really, really, really, really, really, 
really, really, really, really outdated.

But the batmand layer 3 compat version 5 handled these as reserved flags. So 
it would have been a good idea at that time not to leave them in a random 
state and just set them to 0. This would have allowed announcements of 
additional features in the future.


See https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/
include/uapi/linux/batadv_packet.h for the B.A.T.M.A.N. IV and B.A.T.M.A.N. V 
layer 2 packet definitions.

Kind regards,
	Sven

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Re: bits 10 to 15 in OGM packets

[Rahul Bothra]

Thanks, is there a published documentation / memo for B.A.T.M.A.N. V
currently present in the kernel tree?
If not, I'd be happy to join in writing one as I work on the NS-3 model.

Thanks
Rahul Bothra

On Thu, Jun 25, 2020 at 7:36 PM Sven Eckelmann <sven@narfation.org> wrote:
>
> On Thursday, 25 June 2020 15:22:46 CEST Rahul Bothra wrote:
> > I was going through the Internet Draft for B.A.T.M.A.N, and wanted to
> > confirm if the bits 10 to 15 in the OGM packet are supposed to be all
> > zeroes always?
>
> Please don't implement the legacy draft which was never finished. This is
> really, really, really, really, really, really, really, really, really,
> really, really, really, really, really, really, really, really, really,
> really, really, really, really, really, really, really, really, really,
> really, really, really, really, really, really, really, really, really,
> really, really, really, really, really, really, really, really, really,
> really, really, really, really outdated.
>
> But the batmand layer 3 compat version 5 handled these as reserved flags. So
> it would have been a good idea at that time not to leave them in a random
> state and just set them to 0. This would have allowed announcements of
> additional features in the future.
>
>
> See https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/
> include/uapi/linux/batadv_packet.h for the B.A.T.M.A.N. IV and B.A.T.M.A.N. V
> layer 2 packet definitions.
>
> Kind regards,
>         Sven

Re: bits 10 to 15 in OGM packets

[Marek Lindner]

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On Thursday, 25 June 2020 17:16:16 CEST Rahul Bothra wrote:
> Thanks, is there a published documentation / memo for B.A.T.M.A.N. V
> currently present in the kernel tree?

https://www.open-mesh.org/projects/batman-adv/wiki/BATMAN_V

Kind regards,
Marek Lindner

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Re: bits 10 to 15 in OGM packets

[Sven Eckelmann]

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On Thursday, 25 June 2020 17:16:16 CEST Rahul Bothra wrote:
> Thanks, is there a published documentation / memo for B.A.T.M.A.N. V
> currently present in the kernel tree?
> If not, I'd be happy to join in writing one as I work on the NS-3 model.

There are various documents in the wiki [1]. But the code is the most precise 
documentation at the moment. Other persons on this mailing list can also 
answer further questions and help you in situations when the wiki 
documentation doesn't match the actual implementation. At least I've found 
already various problems on the ELP page but the developers involved in the 
implementation didn't update the page(s) (yet). 

Kind regards,
	Sven

[1] https://www.open-mesh.org/projects/batman-adv/wiki/Protocol_information

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