netdev - [PATCH v3 5/6] net: core: run cgroup eBPF egress programs

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Message-Id: <1472241532-11682-6-git-send-email-daniel@zonque.org>
Date:   Fri, 26 Aug 2016 21:58:51 +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 5/6] net: core: run cgroup eBPF egress programs

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 <daniel@...que.org>
---
 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 <linux/netfilter_ingress.h>
 #include <linux/sctp.h>
 #include <linux/crash_dump.h>
+#include <linux/bpf-cgroup.h>
 
 #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.
 	 */
-- 
2.5.5