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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