netdev - Re: [PATCH netfilter] netfilter: xt_IDLETIMER: fix idletimer_tg

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Message-ID: <20210402214049.GL13699@breakpoint.cc>
Date:   Fri, 2 Apr 2021 23:40:49 +0200
From:   Florian Westphal <fw@...len.de>
To:     Maciej Żenczykowski <zenczykowski@...il.com>
Cc:     Maciej Żenczykowski <maze@...gle.com>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        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] netfilter: xt_IDLETIMER: fix
 idletimer_tg_helper non-kosher casts

Maciej Żenczykowski <zenczykowski@...il.com> wrote:
> From: Maciej Żenczykowski <maze@...gle.com>
> 
> The code is relying on the identical layout of the beginning
> of the v0 and v1 structs, but this can easily lead to code bugs
> if one were to try to extend this further...

What is the concern?  These structs are part of ABI, they
cannot be changed.