Re: [PATCH BlueZ] mesh: test AEAD at startup to check kernel support

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On Fri, 2019-08-30 at 20:23 +0200, Michał Lowas-Rzechonek wrote:
> Brian,
> 
> On 08/30, Brian Gix wrote:
> > One time test at startup to ensure either kernel version v4.9 or later,
> > *or* that required AES-CCM support has been back-ported. If support not
> > there, daemon will run without providing D-Bus service or attaching to
> > controllers (prevents systemd thrashing).
> 
> By the way - I have a patch that implements all required cryptographic
> operations using libcrypto, enabled by ./configure --with-openssl
> (disabled by default).
> 
> I know that last time we've talked about this, the consensus was that the
> vendor should patch meshd to work on older kernels, so we did exactly
> that - but maybe having this available in the mainline would be
> interesting?

Yeah, we have talked internally about how much "old kernel support" cruft can be removed, which is one of the
things Marcel would want before doing a "Major Version Number Release" like "BlueZ-6.0", where we could say
that v6.0 requires a minimum kernel version of v4.9 or something...  As opposed to a minor version release like
"BlueZ-5.51" which has support for most v4.X kernels.  Perhaps something like openssl could be *suggested* in a
README as one of a few possible work-arounds a vendor could use to run on an older kernel, but there is no
support for adding an openssl dependancy into the BlueZ mainline tip.






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