[PATCH v5 5/6] net: core: run cgroup eBPF egress programs
From: Daniel Mack <hidden>
Date: 2016-09-12 16:12:14
Also in:
cgroups
Subsystem:
networking [general], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
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 <redacted> --- 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 <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. */
@@ -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