On 2019-08-12, at 12:57:40 +0100, Jeremy Sowden wrote:
> v3.3 of xtables-addons does not compile against v5.2 of the kernel
> owing to a couple of kernel API changes.  These two patches update the
> broken extensions to work with the new API's.
>
> Jeremy Sowden (2):
>   xt_pknock, xt_SYSRQ: don't set shash_desc::flags.
>   xt_DHCPMAC: replaced skb_make_writable with skb_ensure_writable.

Turns out that there is already a merge-request open against the
xtables-addons git repo for the shash_desc::flags fix.  I've created
another one for the skb_ensure_writable fix.

J.