Re: [PATCH] appletalk: Pass IP-over-DDP packets through when 'ipddp0' interface is not present

On Thu, 2016-02-25 at 19:46 -0500, Adam Seering wrote:

On Thu, 2016-02-25 at 14:33 -0500, David Miller wrote:

quoted

From: Adam Seering <redacted>
Date: Tue, 23 Feb 2016 09:19:13 -0500

quoted

Let userspace programs transmit and receive raw IP-over-DDP
packets
with a kernel where "ipddp" was compiled as a module but is not

loaded

quoted

(so no "ipddp0" network interface is exposed).  This makes the

"module

quoted

is not loaded" behavior match the "module was never compiled"

behavior.

quoted

Signed-off-by: Adam Seering <redacted>

I think a better approache is to somehow autoload the module.

Could you elaborate?  Specifically: the kernel currently suppresses
packets on behalf of the module even after the module is unloaded. 
 How
would autoloading the module help with that?

I realize and appreciate that I'm not supposed to nag you folks for
feedback.  But I don't know how to proceed.  So, rather than nag you,
I've filed a bug:

https://bugzilla.kernel.org/show_bug.cgi?id=115031

I've tested my patch; I believe it to be the simplest change that
resolves this bug.  I'm happy to write something else if it would be
cleaner and/or help others, but I would need a more-detailed
explanation of what you're looking for.

I've also filed a ticket downstream:  Red Hat appears to not build the
ipddp module with their stock kernel release, so their users don't hit
this bug.  But Ubuntu does build/ship ipddp; if they likewise didn't,
that would also solve my problem:

https://bugs.launchpad.net/ubuntu/+source/linux-lts-wily/+bug/1559772

Adam