From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Mack Subject: [PATCH v7 4/6] net: filter: run cgroup eBPF ingress programs Date: Tue, 25 Oct 2016 12:14:12 +0200 Message-ID: <1477390454-12553-5-git-send-email-daniel@zonque.org> References: <1477390454-12553-1-git-send-email-daniel@zonque.org> 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 To: htejun@fb.com, daniel@iogearbox.net, ast@fb.com Return-path: Received: from svenfoo.org ([82.94.215.22]:44991 "EHLO mail.zonque.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S935171AbcJYKOY (ORCPT ); Tue, 25 Oct 2016 06:14:24 -0400 In-Reply-To: <1477390454-12553-1-git-send-email-daniel@zonque.org> Sender: netdev-owner@vger.kernel.org List-ID: 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 Acked-by: Alexei Starovoitov --- net/core/filter.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/core/filter.c b/net/core/filter.c index e3813d6..bd6eebe 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; -- 2.7.4