From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Mack Subject: [PATCH v5 5/6] net: core: run cgroup eBPF egress programs Date: Mon, 12 Sep 2016 18:12:14 +0200 Message-ID: <1473696735-11269-6-git-send-email-daniel@zonque.org> References: <1473696735-11269-1-git-send-email-daniel@zonque.org> Cc: davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org, kafai-b10kYP2dOMg@public.gmane.org, fw-HFFVJYpyMKqzQB+pC5nmwQ@public.gmane.org, pablo-Cap9r6Oaw4JrovVCs/uTlw@public.gmane.org, harald-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, sargun-GaZTRHToo+CzQB+pC5nmwQ@public.gmane.org, cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Daniel Mack To: htejun-b10kYP2dOMg@public.gmane.org, daniel-FeC+5ew28dpmcu3hnIyYJQ@public.gmane.org, ast-b10kYP2dOMg@public.gmane.org Return-path: In-Reply-To: <1473696735-11269-1-git-send-email-daniel-cYrQPVfZoowdnm+yROfE0A@public.gmane.org> Sender: cgroups-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: 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 34b5322..f951db2 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 +3330,10 @@ 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_CGROUP_INET_EGRESS); + if (rc) + goto free_skb_list; + /* Disable soft irqs for various locks below. Also * stops preemption for RCU. */ @@ -3416,6 +3421,7 @@ recursion_alert: rcu_read_unlock_bh(); atomic_long_inc(&dev->tx_dropped); +free_skb_list: kfree_skb_list(skb); return rc; out: -- 2.5.5