proper 5.4.y backport of wireguard

[Andy Whitcroft]

On Wed, 24 Feb 2021 at 21:31, Jason A. Donenfeld <Jason at zx2c4.com> wrote:

> Hi,
>
> This is a summary of a conversation with apw on IRC.
>
> wireguard-linux-compat is ugly compat code. It gets the job done. But if
> you have something better, you should use something better.
>
> Fortunately, I've ported upstream's wireguard to 5.4.y in a Greg
> KH-style commit-by-commit backport, following the stable kernel 1:1
> conventions. It's in use by Oracle, SUSE, Google, and others, and
> long-term will be better supported than wireguard-linux-compat. And it's
> easier to maintain, since it's just a series of patches. So, apw and I
> thought that switching to it for focal and for bionic-hwe would be
> beneficial.
>
> The backport lives at:
> https://git.zx2c4.com/wireguard-linux/log/?h=backport-5.4.y
> This tree is rebased always on top of Greg KH's latest 5.4.y stable.
> You currently are missing two patches from Greg's latest, so you apply
> those, and then apply that backport. I've done a trial of it locally
> with success. You can make yourself a functional WireGuard focal kernel
> via:
>
> $ git clone
> https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal
> $ cd focal
> $ git cherry-pick aa350dbe3a1ee5e062228f8f5ebd2ffb6e58709c
> b41352a93c163afafd29f56bb18fd3c0fef1120c
> $ curl '
> https://git.zx2c4.com/wireguard-linux/patch/?id2=gregkh/stable-5.4.y&id=backport-5.4.y'
> | git am -s
>
> The whole series should apply cleanly. Afterwards, simply enable
> CONFIG_WIREGUARD=y and you're good to go.
>
> Applying:
> https://usercontent.irccloud-cdn.com/file/LDuAMzOz/easywgeeze.gif
> Running the tests:
> https://usercontent.irccloud-cdn.com/file/nWpzQBDG/wgtestsuitebuntu.gif
>
> Let me know if you have any questions.
>
> Thanks,
> Jason
>

Thanks for the write up.  Will look into the benefits we discussed.

-apw
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