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@xxxxxxxxxx> --- net/core/dev.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/net/core/dev.c b/net/core/dev.c index 34b5322..eb2bd20 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 +3330,10 @@ 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. */ @@ -3414,8 +3419,8 @@ recursion_alert: rc = -ENETDOWN; rcu_read_unlock_bh(); - atomic_long_inc(&dev->tx_dropped); +free_skb_list: kfree_skb_list(skb); return rc; out: -- 2.5.5 -- To unsubscribe from this list: send the line "unsubscribe cgroups" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
