From: Florian Westphal <fw@strlen.de>
To: Pablo Neira Ayuso <pablo@netfilter.org>
Cc: Florian Westphal <fw@strlen.de>, Quan Tian <tianquan23@gmail.com>,
netfilter-devel@vger.kernel.org, kadlec@netfilter.org
Subject: Re: [PATCH v3 nf-next 2/2] netfilter: nf_tables: support updating userdata for nft_table
Date: Tue, 12 Mar 2024 14:01:34 +0100 [thread overview]
Message-ID: <20240312130134.GC2899@breakpoint.cc> (raw)
In-Reply-To: <ZfBO8JSzsdeDpLrR@calendula>
Pablo Neira Ayuso <pablo@netfilter.org> wrote:
> > AFAICS this means that if the table as udata attached, and userspace
> > makes an update request without a UDATA netlink attribute, we will
> > delete the existing udata.
> >
> > Is that right?
> >
> > My question is, should we instead leave the existing udata as-is and not
> > support removal, only replace?
>
> I would leave it in place too if no _USERDATA is specified.
>
> One more question is if the memcmp() with old and new udata makes
> sense considering two consecutive requests for _USERDATA update in one
> batch.
Great point, any second udata change request in the same batch must fail.
We learned this the hard way with flag updates :(
next prev parent reply other threads:[~2024-03-12 13:01 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-11 14:14 [PATCH v3 nf-next 1/2] netfilter: nf_tables: use struct nlattr * to store userdata for nft_table Quan Tian
2024-03-11 14:14 ` [PATCH v3 nf-next 2/2] netfilter: nf_tables: support updating " Quan Tian
2024-03-12 12:27 ` Florian Westphal
2024-03-12 12:49 ` Pablo Neira Ayuso
2024-03-12 13:01 ` Florian Westphal [this message]
2024-03-12 14:26 ` Quan Tian
2024-03-12 14:33 ` Florian Westphal
2024-03-12 22:23 ` Pablo Neira Ayuso
2024-03-13 1:35 ` Quan Tian
2024-03-13 9:40 ` Pablo Neira Ayuso
2024-03-13 17:08 ` Quan Tian
2024-03-12 14:36 ` Pablo Neira Ayuso
2024-03-12 13:49 ` Pablo Neira Ayuso
2024-03-12 14:02 ` Florian Westphal
2024-03-12 14:10 ` Florian Westphal
2024-03-12 14:30 ` Quan Tian
2024-03-12 14:05 ` [PATCH v3 nf-next 1/2] netfilter: nf_tables: use struct nlattr * to store " Florian Westphal
2024-03-12 14:17 ` Pablo Neira Ayuso
2024-03-12 14:34 ` Florian Westphal
2024-03-12 15:03 ` Quan Tian
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