Re: ppp

[Ryan Raasch <ryan.raasch@gmail.com>]

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Denis Kenzior wrote:
> Hi Ryan,
> 
>> Hello,
>>
>> We need a ppp interface for our modem. I was told on the chat forum that
>> a tap/tun device was to be used. Has anyone else started with this or
>> thought how to implement this?
> 
> We're currently working on a userspace ppp implementation that will integrate 
> with GAtChat.  The goal here is to make it integrate well with the current 
> multiplexed channel capability in GAtMux/GatChat and not need to involve an 
> external daemon.
> 

Wow. So ofono will not use the kernel space ppp and implement the ppp 
stack in userspace?

>> After reading briefly the code from pppd, the implementation, for a
>> first draft, is pretty straight forward (w/o encryption, etc. in
>> userspace). "Just" dial the apn, and hand over the tty fd to ppp via ioctl.
>>
> 
> Unfortunately it is not that simple.  pppd requires a proper kernel file 
> descriptor to hand off to the kernel ppp line discipline.  In our userspace 
> implementation that is not the case.  1 kernel file descriptor is shared by 
> potentially many GAtChat channels using a multiplexing protocol.  Hence why we 
> can't reuse the kernel implementation.
> 

Yea. That's right.

> Regards,
> -Denis
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