netdev - Re: [PATCH] netfilter: IDLETIMER target v1

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Date:   Tue, 31 Mar 2020 20:16:41 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Jan Engelhardt <jengelh@...i.de>
Cc:     Maciej Żenczykowski <zenczykowski@...il.com>,
        Maciej Żenczykowski <maze@...gle.com>,
        Florian Westphal <fw@...len.de>,
        Linux Network Development Mailing List 
        <netdev@...r.kernel.org>,
        Netfilter Development Mailing List 
        <netfilter-devel@...r.kernel.org>,
        Manoj Basapathi <manojbm@...eaurora.org>,
        Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>
Subject: Re: [PATCH] netfilter: IDLETIMER target v1 - match Android layout

On Tue, Mar 31, 2020 at 08:14:17PM +0200, Jan Engelhardt wrote:
> 
> On Tuesday 2020-03-31 18:35, Maciej Żenczykowski wrote:
> >Signed-off-by: Maciej Żenczykowski <maze@...gle.com>
> >---
> > include/uapi/linux/netfilter/xt_IDLETIMER.h | 1 +
> > 1 file changed, 1 insertion(+)
> >
> >diff --git a/include/uapi/linux/netfilter/xt_IDLETIMER.h b/include/uapi/linux/netfilter/xt_IDLETIMER.h
> >index 434e6506abaa..49ddcdc61c09 100644
> >--- a/include/uapi/linux/netfilter/xt_IDLETIMER.h
> >+++ b/include/uapi/linux/netfilter/xt_IDLETIMER.h
> >@@ -48,6 +48,7 @@ struct idletimer_tg_info_v1 {
> > 
> > 	char label[MAX_IDLETIMER_LABEL_SIZE];
> > 
> >+	__u8 send_nl_msg;   /* unused: for compatibility with Android */
> > 	__u8 timer_type;
> > 
> > 	/* for kernel module internal use only */
> >-- 
> 
> This breaks the ABI for law-abiding Linux users (i.e. the GNU/Linux 
> subgroup of it), which is equally terrible.
> 
> You will have to introduce a IDLETIMER v2.

IIRC, IDLETIMER v1 is in net-next, scheduled for 5.7-rc, there is no
release for this code yet.