[PATCH v8 4/6] net: filter: run cgroup eBPF ingress programs
From: Daniel Mack <daniel@zonque.org>
Date: 2016-11-17 18:27:24
Also in:
cgroups
Subsystem:
bpf [general] (safe dynamic programs and tools), bpf [networking] (tcx & tc bpf, sock_addr), networking [general], the rest · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Martin KaFai Lau, "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 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 skb through bpf_skb_load_bytes(), and the payload starts at the network headers (L3). 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@zonque.org> Acked-by: Alexei Starovoitov <ast@kernel.org> --- net/core/filter.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/net/core/filter.c b/net/core/filter.c
index e3813d6..474b486 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c@@ -78,6 +78,10 @@ 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 = BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb); + if (err) + return err; + err = security_sock_rcv_skb(sk, skb); if (err) return err;
--
2.7.4