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1#ifndef _BPF_CGROUP_H
2#define _BPF_CGROUP_H
3
4#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 __rcu *effective[MAX_BPF_ATTACH_TYPE];
24 bool disallow_override[MAX_BPF_ATTACH_TYPE];
25};
26
27void cgroup_bpf_put(struct cgroup *cgrp);
28void cgroup_bpf_inherit(struct cgroup *cgrp, struct cgroup *parent);
29
30int __cgroup_bpf_update(struct cgroup *cgrp, struct cgroup *parent,
31 struct bpf_prog *prog, enum bpf_attach_type type,
32 bool overridable);
33
34/* Wrapper for __cgroup_bpf_update() protected by cgroup_mutex */
35int cgroup_bpf_update(struct cgroup *cgrp, struct bpf_prog *prog,
36 enum bpf_attach_type type, bool overridable);
37
38int __cgroup_bpf_run_filter_skb(struct sock *sk,
39 struct sk_buff *skb,
40 enum bpf_attach_type type);
41
42int __cgroup_bpf_run_filter_sk(struct sock *sk,
43 enum bpf_attach_type type);
44
45/* Wrappers for __cgroup_bpf_run_filter_skb() guarded by cgroup_bpf_enabled. */
46#define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb) \
47({ \
48 int __ret = 0; \
49 if (cgroup_bpf_enabled) \
50 __ret = __cgroup_bpf_run_filter_skb(sk, skb, \
51 BPF_CGROUP_INET_INGRESS); \
52 \
53 __ret; \
54})
55
56#define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk, skb) \
57({ \
58 int __ret = 0; \
59 if (cgroup_bpf_enabled && sk && sk == skb->sk) { \
60 typeof(sk) __sk = sk_to_full_sk(sk); \
61 if (sk_fullsock(__sk)) \
62 __ret = __cgroup_bpf_run_filter_skb(__sk, skb, \
63 BPF_CGROUP_INET_EGRESS); \
64 } \
65 __ret; \
66})
67
68#define BPF_CGROUP_RUN_PROG_INET_SOCK(sk) \
69({ \
70 int __ret = 0; \
71 if (cgroup_bpf_enabled && sk) { \
72 __ret = __cgroup_bpf_run_filter_sk(sk, \
73 BPF_CGROUP_INET_SOCK_CREATE); \
74 } \
75 __ret; \
76})
77
78#else
79
80struct cgroup_bpf {};
81static inline void cgroup_bpf_put(struct cgroup *cgrp) {}
82static inline void cgroup_bpf_inherit(struct cgroup *cgrp,
83 struct cgroup *parent) {}
84
85#define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk,skb) ({ 0; })
86#define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk,skb) ({ 0; })
87#define BPF_CGROUP_RUN_PROG_INET_SOCK(sk) ({ 0; })
88
89#endif /* CONFIG_CGROUP_BPF */
90
91#endif /* _BPF_CGROUP_H */