From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0B60EC4363D for ; Wed, 7 Oct 2020 23:22:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B77F22053B for ; Wed, 7 Oct 2020 23:22:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727261AbgJGXW2 (ORCPT ); Wed, 7 Oct 2020 19:22:28 -0400 Received: from correo.us.es ([193.147.175.20]:46820 "EHLO mail.us.es" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726219AbgJGXW2 (ORCPT ); Wed, 7 Oct 2020 19:22:28 -0400 Received: from antivirus1-rhel7.int (unknown [192.168.2.11]) by mail.us.es (Postfix) with ESMTP id 91A4AE4B89 for ; Thu, 8 Oct 2020 01:22:26 +0200 (CEST) Received: from antivirus1-rhel7.int (localhost [127.0.0.1]) by antivirus1-rhel7.int (Postfix) with ESMTP id 81D42DA722 for ; Thu, 8 Oct 2020 01:22:26 +0200 (CEST) Received: by antivirus1-rhel7.int (Postfix, from userid 99) id 777E2DA704; Thu, 8 Oct 2020 01:22:26 +0200 (CEST) Received: from antivirus1-rhel7.int (localhost [127.0.0.1]) by antivirus1-rhel7.int (Postfix) with ESMTP id 65EB3DA722 for ; Thu, 8 Oct 2020 01:22:24 +0200 (CEST) Received: from 192.168.1.97 (192.168.1.97) by antivirus1-rhel7.int (F-Secure/fsigk_smtp/550/antivirus1-rhel7.int); Thu, 08 Oct 2020 01:22:24 +0200 (CEST) X-Virus-Status: clean(F-Secure/fsigk_smtp/550/antivirus1-rhel7.int) Received: from us.es (unknown [90.77.255.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: 1984lsi) by entrada.int (Postfix) with ESMTPSA id 47B7642EF42A for ; Thu, 8 Oct 2020 01:22:24 +0200 (CEST) Date: Thu, 8 Oct 2020 01:22:23 +0200 X-SMTPAUTHUS: auth mail.us.es From: Pablo Neira Ayuso To: netfilter-devel@vger.kernel.org Subject: Re: [PATCH nf-next 0/4] Add nf_tables ingress hook for the inet family Message-ID: <20201007232223.GA27414@salvia> References: <20201007231448.27346-1-pablo@netfilter.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20201007231448.27346-1-pablo@netfilter.org> User-Agent: Mutt/1.10.1 (2018-07-13) X-Virus-Scanned: ClamAV using ClamSMTP Precedence: bulk List-ID: X-Mailing-List: netfilter-devel@vger.kernel.org On Thu, Oct 08, 2020 at 01:14:44AM +0200, Pablo Neira Ayuso wrote: > Hi, > > The following patchset adds support for the inet ingress hook: > > Patch #1 adds nf_static_key_inc() and nf_static_key_dec() helper functions. > Patch #2 adds nf_ingress_hook() helper function. > Patch #3 adds inet ingress hook support to the core. > Patch #4 adds inet ingress hook support for nf_tables. > > The following example shows how to place offenders into the 'blackhole' > set. Offenders in this case are those that connect to the local SSH port > over the specified rate limit. The inet ingress chain is used to > shortcircuit the evaluation of the traffic coming from the offender at > early stage in the packet processing receive path. > > table inet filter { > set blackhole { > type ipv4_addr > size 65535 > flags dynamic,timeout > timeout 5m > } > > chain input { > type filter hook input priority filter; policy accept; > ct state new tcp dport 22 update @blackhole { ip saddr limit rate over 4/minute } counter packets 0 bytes 0 Actually, this should be: ct state new tcp dport 22 limit rate over 4/minute update @blackhole { ip saddr } counter packets 0 bytes 0 maybe this example is not that useful... ... But the overall idea is to share sets with the ingress hook, which was not possible so far :-) > } > > chain ingress { > type filter hook unknown device "enp0s25" priority filter; policy accept; > ip saddr @blackhole counter packets 0 bytes 0 drop > } > } > > Pablo Neira Ayuso (4): > netfilter: add nf_static_key_{inc,dec} > netfilter: add nf_ingress_hook() helper function > netfilter: add inet ingress support > netfilter: nf_tables: add inet ingress support > > include/net/netfilter/nf_tables.h | 6 ++ > include/net/netfilter/nf_tables_ipv4.h | 33 +++++++ > include/net/netfilter/nf_tables_ipv6.h | 46 +++++++++ > include/uapi/linux/netfilter.h | 1 + > net/netfilter/core.c | 127 ++++++++++++++++++++----- > net/netfilter/nf_tables_api.c | 14 +-- > net/netfilter/nft_chain_filter.c | 35 ++++++- > 7 files changed, 228 insertions(+), 34 deletions(-) > > -- > 2.20.1 >