Re: MPPE in kernel?

Paul Mackerras (paulus@samba.org)
Mon, 12 May 2003 22:36:29 +1000


Frank Cusack writes:

> What are the chances of getting MPPE (PPP encryption) into the 2.4.21
> and/or 2.5.x kernels?

First, are there any patent issues that you are aware of?

> I'm not so concerned about getting any of that included though; what
> I really want is for the changes to ppp_generic.c to be included.
> It's not so much fun to have to maintain patches. The changes required
> are generic, don't require crypto, and are generally uneventful. Getting
> the crypto bits and the mppe compressor itself included would just be
> a bonus.

The fundamental problem is that MPPE is misusing CCP (compression
control protocol) for something for which it was never intended. The
specific place where this is a problem is that the compression code in
ppp_generic doesn't guarantee that it will never send a packet out
uncompressed, but MPPE requires that. How do you get around that
problem?

Regards,
Paul.
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