From patchwork Mon Sep 19 16:43:59 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Mack X-Patchwork-Id: 671847 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 3sdBYx5NLNz9sC7 for ; Tue, 20 Sep 2016 02:44:37 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932235AbcISQo3 (ORCPT ); Mon, 19 Sep 2016 12:44:29 -0400 Received: from svenfoo.org ([82.94.215.22]:33563 "EHLO mail.zonque.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752151AbcISQoL (ORCPT ); Mon, 19 Sep 2016 12:44:11 -0400 Received: from localhost (localhost [127.0.0.1]) by mail.zonque.de (Postfix) with ESMTP id BD663B8224; Mon, 19 Sep 2016 18:44:09 +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 tNHNE9CERze0; Mon, 19 Sep 2016 18:44:09 +0200 (CEST) Received: from rabotti.localdomain (p5DDC731A.dip0.t-ipconnect.de [93.220.115.26]) (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 1D858B8220; Mon, 19 Sep 2016 18:44:09 +0200 (CEST) From: Daniel Mack To: htejun@fb.com, daniel@iogearbox.net, ast@fb.com Cc: davem@davemloft.net, kafai@fb.com, fw@strlen.de, pablo@netfilter.org, harald@redhat.com, netdev@vger.kernel.org, sargun@sargun.me, cgroups@vger.kernel.org, Daniel Mack Subject: [PATCH v6 4/6] net: filter: run cgroup eBPF ingress programs Date: Mon, 19 Sep 2016 18:43:59 +0200 Message-Id: <1474303441-3745-5-git-send-email-daniel@zonque.org> X-Mailer: git-send-email 2.5.5 In-Reply-To: <1474303441-3745-1-git-send-email-daniel@zonque.org> References: <1474303441-3745-1-git-send-email-daniel@zonque.org> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org If the cgroup associated with the receiving socket has an eBPF programs installed, run them from sk_filter_trim_cap(). eBPF programs used in this context are expected to either return 1 to let the packet pass, or != 1 to drop them. The programs have access to the skb through bpf_skb_load_bytes(), and the payload starts at the network headers (L3). Note that cgroup_bpf_run_filter() is stubbed out as static inline nop for !CONFIG_CGROUP_BPF, and is otherwise guarded by a static key if the feature is unused. Signed-off-by: Daniel Mack --- net/core/filter.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/core/filter.c b/net/core/filter.c index e46c98e..ce6e527 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -78,6 +78,10 @@ int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap) if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC)) return -ENOMEM; + err = cgroup_bpf_run_filter(sk, skb, BPF_CGROUP_INET_INGRESS); + if (err) + return err; + err = security_sock_rcv_skb(sk, skb); if (err) return err;