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authorDaniel Mack <daniel@zonque.org>2016-11-23 16:52:28 +0100
committerDavid S. Miller <davem@davemloft.net>2016-11-25 22:26:04 +0100
commitc11cd3a6ec3a817c6b71b00c559e25d855f7e5b4 (patch)
tree5156c0612dd01bccfa91c89e3862b919f7ad9066 /net
parentbpf: add BPF_PROG_ATTACH and BPF_PROG_DETACH commands (diff)
downloadlinux-c11cd3a6ec3a817c6b71b00c559e25d855f7e5b4.tar.xz
linux-c11cd3a6ec3a817c6b71b00c559e25d855f7e5b4.zip
net: filter: run cgroup eBPF ingress programs
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> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/filter.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/net/core/filter.c b/net/core/filter.c
index 2de302d68038..ea315af56511 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;