blob: af2ca8b432c07b387775e0f2c3ea276914318589 [file] [log] [blame]
Daniel Mack30070982016-11-23 16:52:26 +01001#ifndef _BPF_CGROUP_H
2#define _BPF_CGROUP_H
3
Daniel Mack30070982016-11-23 16:52:26 +01004#include <linux/jump_label.h>
5#include <uapi/linux/bpf.h>
6
7struct sock;
8struct cgroup;
9struct sk_buff;
10
11#ifdef CONFIG_CGROUP_BPF
12
13extern struct static_key_false cgroup_bpf_enabled_key;
14#define cgroup_bpf_enabled static_branch_unlikely(&cgroup_bpf_enabled_key)
15
16struct cgroup_bpf {
17 /*
18 * Store two sets of bpf_prog pointers, one for programs that are
19 * pinned directly to this cgroup, and one for those that are effective
20 * when this cgroup is accessed.
21 */
22 struct bpf_prog *prog[MAX_BPF_ATTACH_TYPE];
23 struct bpf_prog *effective[MAX_BPF_ATTACH_TYPE];
24};
25
26void cgroup_bpf_put(struct cgroup *cgrp);
27void cgroup_bpf_inherit(struct cgroup *cgrp, struct cgroup *parent);
28
29void __cgroup_bpf_update(struct cgroup *cgrp,
30 struct cgroup *parent,
31 struct bpf_prog *prog,
32 enum bpf_attach_type type);
33
34/* Wrapper for __cgroup_bpf_update() protected by cgroup_mutex */
35void cgroup_bpf_update(struct cgroup *cgrp,
36 struct bpf_prog *prog,
37 enum bpf_attach_type type);
38
David Ahernb2cd1252016-12-01 08:48:03 -080039int __cgroup_bpf_run_filter_skb(struct sock *sk,
40 struct sk_buff *skb,
41 enum bpf_attach_type type);
Daniel Mack30070982016-11-23 16:52:26 +010042
David Ahernb2cd1252016-12-01 08:48:03 -080043/* Wrappers for __cgroup_bpf_run_filter_skb() guarded by cgroup_bpf_enabled. */
44#define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb) \
45({ \
46 int __ret = 0; \
47 if (cgroup_bpf_enabled) \
48 __ret = __cgroup_bpf_run_filter_skb(sk, skb, \
49 BPF_CGROUP_INET_INGRESS); \
50 \
51 __ret; \
Daniel Mack30070982016-11-23 16:52:26 +010052})
53
David Ahernb2cd1252016-12-01 08:48:03 -080054#define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk, skb) \
55({ \
56 int __ret = 0; \
57 if (cgroup_bpf_enabled && sk && sk == skb->sk) { \
58 typeof(sk) __sk = sk_to_full_sk(sk); \
59 if (sk_fullsock(__sk)) \
60 __ret = __cgroup_bpf_run_filter_skb(__sk, skb, \
61 BPF_CGROUP_INET_EGRESS); \
62 } \
63 __ret; \
Daniel Mack30070982016-11-23 16:52:26 +010064})
65
66#else
67
68struct cgroup_bpf {};
69static inline void cgroup_bpf_put(struct cgroup *cgrp) {}
70static inline void cgroup_bpf_inherit(struct cgroup *cgrp,
71 struct cgroup *parent) {}
72
73#define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk,skb) ({ 0; })
74#define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk,skb) ({ 0; })
75
76#endif /* CONFIG_CGROUP_BPF */
77
78#endif /* _BPF_CGROUP_H */