From patchwork Wed Sep 16 15:42:58 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Mack X-Patchwork-Id: 518466 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id F0C4A1400A0 for ; Thu, 17 Sep 2015 01:51:24 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753561AbbIPPu6 (ORCPT ); Wed, 16 Sep 2015 11:50:58 -0400 Received: from svenfoo.org ([82.94.215.22]:47601 "EHLO mail.zonque.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752239AbbIPPu4 (ORCPT ); Wed, 16 Sep 2015 11:50:56 -0400 Received: from localhost (localhost [127.0.0.1]) by mail.zonque.de (Postfix) with ESMTP id 88D31C02AF; Wed, 16 Sep 2015 17:43:08 +0200 (CEST) Received: from mail.zonque.de ([127.0.0.1]) by localhost (rambrand.bugwerft.de [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0mE4Pq3TLWn9; Wed, 16 Sep 2015 17:43:08 +0200 (CEST) Received: from cacofonix.fritz.box (p54AF492D.dip0.t-ipconnect.de [84.175.73.45]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.zonque.de (Postfix) with ESMTPSA id 15A63C02AE; Wed, 16 Sep 2015 17:43:08 +0200 (CEST) From: Daniel Mack To: pablo@netfilter.org Cc: daniel@iogearbox.net, netfilter-devel@vger.kernel.org, netdev@vger.kernel.org, fw@strlen.de, balazs.scheidler@balabit.com, Daniel Mack Subject: [PATCH RFC 1/3] netfilter: add socket to struct nft_pktinfo Date: Wed, 16 Sep 2015 17:42:58 +0200 Message-Id: <1442418180-14322-2-git-send-email-daniel@zonque.org> X-Mailer: git-send-email 2.5.0 In-Reply-To: <1442418180-14322-1-git-send-email-daniel@zonque.org> References: <1442418180-14322-1-git-send-email-daniel@zonque.org> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org The high-level netfilter hook API already enables users to pass a socket, but that information is lost when the chains are walked. In order to let internal eval callbacks use the passed filter rather than skb->sk, add a pointer of type 'struct sock' to 'struct nft_pktinfo' and set that field via nft_set_pktinfo(). This allows us to run filter chains from situations where skb->sk is unset. Fall back to skb->sk in case state->sk is NULL, so filter callbacks can be written in a generic way. Signed-off-by: Daniel Mack --- include/net/netfilter/nf_tables.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h index aa8bee7..05e97ed 100644 --- a/include/net/netfilter/nf_tables.h +++ b/include/net/netfilter/nf_tables.h @@ -13,6 +13,7 @@ #define NFT_JUMP_STACK_SIZE 16 struct nft_pktinfo { + struct sock *sk; struct sk_buff *skb; const struct net_device *in; const struct net_device *out; @@ -29,6 +30,7 @@ static inline void nft_set_pktinfo(struct nft_pktinfo *pkt, struct sk_buff *skb, const struct nf_hook_state *state) { + pkt->sk = state->sk ?: skb->sk; pkt->skb = skb; pkt->in = pkt->xt.in = state->in; pkt->out = pkt->xt.out = state->out;