From patchwork Fri Aug 26 19:58:51 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Mack X-Patchwork-Id: 663226 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 3sLX222lqlz9sRB for ; Sat, 27 Aug 2016 05:59:38 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753674AbcHZT7F (ORCPT ); Fri, 26 Aug 2016 15:59:05 -0400 Received: from svenfoo.org ([82.94.215.22]:37921 "EHLO mail.zonque.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753398AbcHZT7D (ORCPT ); Fri, 26 Aug 2016 15:59:03 -0400 Received: from localhost (localhost [127.0.0.1]) by mail.zonque.de (Postfix) with ESMTP id 2821EC02B4; Fri, 26 Aug 2016 21:59:02 +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 e5tAG0Fgi3uW; Fri, 26 Aug 2016 21:59:02 +0200 (CEST) Received: from rabotti.localdomain (p5DDC6FE7.dip0.t-ipconnect.de [93.220.111.231]) (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 85FBEC02A9; Fri, 26 Aug 2016 21:59:01 +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, Daniel Mack Subject: [PATCH v3 5/6] net: core: run cgroup eBPF egress programs Date: Fri, 26 Aug 2016 21:58:51 +0200 Message-Id: <1472241532-11682-6-git-send-email-daniel@zonque.org> X-Mailer: git-send-email 2.5.5 In-Reply-To: <1472241532-11682-1-git-send-email-daniel@zonque.org> References: <1472241532-11682-1-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 __dev_queue_xmit(). 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 full skb, including the MAC headers. 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/dev.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/net/core/dev.c b/net/core/dev.c index a75df86..17484e6 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -141,6 +141,7 @@ #include #include #include +#include #include "net-sysfs.h" @@ -3329,6 +3330,11 @@ static int __dev_queue_xmit(struct sk_buff *skb, void *accel_priv) if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_SCHED_TSTAMP)) __skb_tstamp_tx(skb, NULL, skb->sk, SCM_TSTAMP_SCHED); + rc = cgroup_bpf_run_filter(skb->sk, skb, + BPF_ATTACH_TYPE_CGROUP_INET_EGRESS); + if (rc) + return rc; + /* Disable soft irqs for various locks below. Also * stops preemption for RCU. */