netdev - [PATCH v3 4/6] net: filter: run cgroup eBPF ingress programs

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Date:   Fri, 26 Aug 2016 21:58:50 +0200
From:   Daniel Mack <daniel@...que.org>
To:     htejun@...com, daniel@...earbox.net, ast@...com
Cc:     davem@...emloft.net, kafai@...com, fw@...len.de,
        pablo@...filter.org, harald@...hat.com, netdev@...r.kernel.org,
        sargun@...gun.me, Daniel Mack <daniel@...que.org>
Subject: [PATCH v3 4/6] net: filter: run cgroup eBPF ingress programs

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 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 <daniel@...que.org>
---
 net/core/filter.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/net/core/filter.c b/net/core/filter.c
index bc04e5c..163f75b 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -78,6 +78,11 @@ 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_ATTACH_TYPE_CGROUP_INET_INGRESS);
+	if (err)
+		return err;
+
 	err = security_sock_rcv_skb(sk, skb);
 	if (err)
 		return err;
-- 
2.5.5