From: Kerin Millar <kfm@plushkava.net>
To: Edward Dickson <edickson@hudson-trading.com>
Cc: netfilter@vger.kernel.org
Subject: Re: [nftables] Multiple reject withs in a single rule
Date: Thu, 1 Feb 2024 17:24:55 +0000 [thread overview]
Message-ID: <20240201172455.dbcd6ff0da8e545e06106e93@plushkava.net> (raw)
In-Reply-To: <CALqmkGz7HqTeAvyZwJDTcZsuSUVi6usAD8P6XwTnfMxzBSs=Fw@mail.gmail.com>
On Fri, 24 Nov 2023 14:57:09 +0000
Edward Dickson <edickson@hudson-trading.com> wrote:
> Hello,
>
> I am running nftables v0.9.8 and am aiming to create a single
> rejection rule which specifies multiple rejection types for different
> protocols.
>
> Something like: "reject with tcp reset with icmpx type admin-prohibited".
>
> However when I've tried this, nftables throws an error:
> Error: syntax error, unexpected with, expecting end of file or newline
> or semicolon
> add rule inet filter output reject with tcp reset with icmpx type
> admin-prohibited
>
> ^^^^ (under the second with)
>
> Error: Statement after terminal statement has no effect
> add rule inet filter output reject with tcp reset reject with icmpx
> type admin-prohibited
> ~~~~~~ (under first reject)
> ^^^^^^ (under the second reject)
>
>
> I am currently using two rules which covers TCP, ICMP and anything
> else, but would be better as a single rule:
> add rule inet filter output meta l4proto tcp reject with tcp reset
> add rule inet filter output reject with icmpx type admin-prohibited
>
> But this would be better as a single rule, as the duplicate similar
> rules create complexity and duplication.
>
> Is there a way to specify multiple rejection types in a single nftables rule?
A chain would handle this perfectly adequately.
chain prohibit {
meta l4proto tcp reject with tcp reset
meta l4proto udp reject
reject with icmpx type admin-prohibited
}
Then, simply employ "goto prohibit" as a target in your rules.
--
Kerin Millar
prev parent reply other threads:[~2024-02-01 17:24 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-24 14:57 [nftables] Multiple reject withs in a single rule Edward Dickson
2023-11-24 17:03 ` Reindl Harald
2024-02-01 17:24 ` Kerin Millar [this message]
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=20240201172455.dbcd6ff0da8e545e06106e93@plushkava.net \
--to=kfm@plushkava.net \
--cc=edickson@hudson-trading.com \
--cc=netfilter@vger.kernel.org \
/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 read-only IMAP folder(s) and NNTP newsgroup(s).