From: Florian Westphal <fw@strlen.de>
To: Pablo Neira Ayuso <pablo@netfilter.org>
Cc: Florian Westphal <fw@strlen.de>, Phil Sutter <phil@nwl.cc>,
netfilter-devel@vger.kernel.org
Subject: Re: [nf PATCH v2 8/8] netfilter: nf_tables: Add locking for NFT_MSG_GETSETELEM_RESET requests
Date: Thu, 28 Sep 2023 21:21:27 +0200 [thread overview]
Message-ID: <20230928192127.GH19098@breakpoint.cc> (raw)
In-Reply-To: <ZRXOIrxtu5JPN4jA@calendula>
Pablo Neira Ayuso <pablo@netfilter.org> wrote:
> > I'd say its semantically the same thing, we alter state.
> >
> > We even emit audit records to tell userspace that there is state
> > change.
>
> This is a netlink event, how does the mutex help in that regard?
It will prevent two concurrent 'reset dumps' from messing
up internal state of counters, quota, etc.
> > Also, are you sure spinlock is appropriate here?
> >
> > For full-ruleset resets we might be doing quite some
> > traverals.
>
> I said several times, we grab and release this for each
> netlink_recvmsg(), commit_mutex helps us in no way to fix the "two
> concurrent dump-and-reset problem".
It does, any lock prevents the 'concurrent reset problem'.
next prev parent reply other threads:[~2023-09-28 19:21 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-28 16:52 [nf PATCH v2 0/8] Introduce locking for reset requests Phil Sutter
2023-09-28 16:52 ` [nf PATCH v2 1/8] netfilter: nf_tables: Don't allocate nft_rule_dump_ctx Phil Sutter
2023-09-28 18:49 ` Pablo Neira Ayuso
2023-09-29 10:15 ` Phil Sutter
2023-09-28 19:00 ` Florian Westphal
2023-09-29 10:13 ` Phil Sutter
2023-09-28 16:52 ` [nf PATCH v2 2/8] netfilter: nf_tables: Introduce nf_tables_getrule_single() Phil Sutter
2023-09-28 16:52 ` [nf PATCH v2 3/8] netfilter: nf_tables: Add locking for NFT_MSG_GETRULE_RESET requests Phil Sutter
2023-09-28 16:52 ` [nf PATCH v2 4/8] netfilter: nf_tables: Introduce struct nft_obj_dump_ctx Phil Sutter
2023-09-28 16:52 ` [nf PATCH v2 5/8] netfilter: nf_tables: Introduce nf_tables_getobj_single Phil Sutter
2023-09-28 16:52 ` [nf PATCH v2 6/8] netfilter: nf_tables: Add locking for NFT_MSG_GETOBJ_RESET requests Phil Sutter
2023-09-28 16:52 ` [nf PATCH v2 7/8] netfilter: nf_tables: Pass reset bit in nft_set_dump_ctx Phil Sutter
2023-09-28 18:53 ` Pablo Neira Ayuso
2023-09-29 10:08 ` Phil Sutter
2023-09-29 10:15 ` Pablo Neira Ayuso
2023-09-29 10:18 ` Phil Sutter
2023-09-29 10:56 ` Pablo Neira Ayuso
2023-09-29 11:12 ` Phil Sutter
2023-09-28 16:52 ` [nf PATCH v2 8/8] netfilter: nf_tables: Add locking for NFT_MSG_GETSETELEM_RESET requests Phil Sutter
2023-09-28 17:46 ` Florian Westphal
2023-09-28 18:47 ` Pablo Neira Ayuso
2023-09-28 18:57 ` Florian Westphal
2023-09-28 19:04 ` Pablo Neira Ayuso
2023-09-28 19:21 ` Florian Westphal [this message]
2023-09-28 20:07 ` Florian Westphal
2023-09-29 11:25 ` Phil Sutter
2023-09-29 11:30 ` Florian Westphal
2023-09-29 11:45 ` Phil Sutter
2023-09-28 19:39 ` Jozsef Kadlecsik
2023-09-28 20:09 ` Florian Westphal
2023-09-28 20:25 ` Jozsef Kadlecsik
2023-09-29 11:03 ` Phil Sutter
2023-09-28 18:51 ` Pablo Neira Ayuso
2023-09-29 10:28 ` Phil Sutter
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20230928192127.GH19098@breakpoint.cc \
--to=fw@strlen.de \
--cc=netfilter-devel@vger.kernel.org \
--cc=pablo@netfilter.org \
--cc=phil@nwl.cc \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).