From: Florian Westphal <fw@strlen.de>
To: Quan Tian <tianquan23@gmail.com>
Cc: netfilter-devel@vger.kernel.org, pablo@netfilter.org,
kadlec@netfilter.org, fw@strlen.de
Subject: Re: [PATCH v3 nf-next 2/2] netfilter: nf_tables: support updating userdata for nft_table
Date: Tue, 12 Mar 2024 15:10:46 +0100 [thread overview]
Message-ID: <20240312141046.GD1529@breakpoint.cc> (raw)
In-Reply-To: <20240311141454.31537-2-tianquan23@gmail.com>
Quan Tian <tianquan23@gmail.com> wrote:
> - trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
> + swap(trans->ctx.table->udata, nft_trans_table_udata(trans));
> + nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
I missed this in my review, as Pablo pointed out you can't use swap()
here, because table->udata is rcu protected.
Something like this should work as replacement:
nft_trans_table_udata(trans) = rcu_replace_pointer(trans->ctx.table->udata,
nft_trans_table_udata(trans),
lockdep_commit_lock_is_held(trans->ctx.net));
This will swap and ensure all stores are visible.
next prev parent reply other threads:[~2024-03-12 14:10 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
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 [this message]
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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