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From: Phil Sutter <phil@nwl.cc>
To: Pablo Neira Ayuso <pablo@netfilter.org>
Cc: netfilter-devel@vger.kernel.org, fw@strlen.de
Subject: Re: [PATCH nft 2/5] tests: shell: cannot use handle for non-existing rule in kernel
Date: Mon, 17 Jun 2019 18:29:20 +0200	[thread overview]
Message-ID: <20190617162920.GU31548@orbyte.nwl.cc> (raw)
In-Reply-To: <20190617160657.qrl2vx5dn5zomk6l@salvia>

Hi Pablo,

On Mon, Jun 17, 2019 at 06:06:57PM +0200, Pablo Neira Ayuso wrote:
> On Mon, Jun 17, 2019 at 06:00:30PM +0200, Phil Sutter wrote:
[...]
> > My initial implementation of intra-transaction rule references made
> > this handle guessing impossible, but your single point cache
> > fetching still allowed for it (hence why I dropped my patch with a
> > similar change).
> 
> Hm. I think we should not guess the handle that the kernel assigns.
> 
> In a batch, handles do not exist. We could expose the
> intra-transaction index if needed to the user. But I don't see a
> use-case for this.
> 
> I think we should leave the handle as a reference to already existing
> rules in the kernel.

Yes, it's an ugly hack that should never have worked in the first place,
I fully agree. Yet that it stops working indicates user space starts
doing more than it has to - IMHO relying upon the kernel verifier is
desirable. At least it allows for much better handling of large
rulesets.

Cheers, Phil

  reply	other threads:[~2019-06-17 16:29 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-17 12:25 [PATCH nft 1/5] src: remove useless parameter from cache_flush() Pablo Neira Ayuso
2019-06-17 12:25 ` [PATCH nft 2/5] tests: shell: cannot use handle for non-existing rule in kernel Pablo Neira Ayuso
2019-06-17 16:00   ` Phil Sutter
2019-06-17 16:06     ` Pablo Neira Ayuso
2019-06-17 16:29       ` Phil Sutter [this message]
2019-06-17 12:25 ` [PATCH nft 3/5] src: add cache level flags Pablo Neira Ayuso
2019-06-17 15:57   ` Phil Sutter
2019-06-17 16:11   ` Phil Sutter
2019-06-17 16:28     ` Pablo Neira Ayuso
2019-06-17 16:45       ` Phil Sutter
2019-06-17 17:24         ` Pablo Neira Ayuso
2019-06-17 17:28           ` Phil Sutter
2019-06-17 17:33             ` Pablo Neira Ayuso
2019-06-17 20:37               ` Phil Sutter
2019-06-17 12:25 ` [PATCH nft 4/5] rule: skip cache population from do_command_monitor() Pablo Neira Ayuso
2019-06-17 12:25 ` [PATCH nft 5/5] netlink: remove netlink_list_table() Pablo Neira Ayuso

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