xref: /linux-6.15/include/linux/bpf-cgroup.h (revision 0fd67c1c)
1 #ifndef _BPF_CGROUP_H
2 #define _BPF_CGROUP_H
3 
4 #include <linux/jump_label.h>
5 #include <uapi/linux/bpf.h>
6 
7 struct sock;
8 struct cgroup;
9 struct sk_buff;
10 
11 #ifdef CONFIG_CGROUP_BPF
12 
13 extern struct static_key_false cgroup_bpf_enabled_key;
14 #define cgroup_bpf_enabled static_branch_unlikely(&cgroup_bpf_enabled_key)
15 
16 struct 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 };
25 
26 void cgroup_bpf_put(struct cgroup *cgrp);
27 void cgroup_bpf_inherit(struct cgroup *cgrp, struct cgroup *parent);
28 
29 void __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 */
35 void cgroup_bpf_update(struct cgroup *cgrp,
36 		       struct bpf_prog *prog,
37 		       enum bpf_attach_type type);
38 
39 int __cgroup_bpf_run_filter_skb(struct sock *sk,
40 				struct sk_buff *skb,
41 				enum bpf_attach_type type);
42 
43 int __cgroup_bpf_run_filter_sk(struct sock *sk,
44 			       enum bpf_attach_type type);
45 
46 /* Wrappers for __cgroup_bpf_run_filter_skb() guarded by cgroup_bpf_enabled. */
47 #define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb)			      \
48 ({									      \
49 	int __ret = 0;							      \
50 	if (cgroup_bpf_enabled)						      \
51 		__ret = __cgroup_bpf_run_filter_skb(sk, skb,		      \
52 						    BPF_CGROUP_INET_INGRESS); \
53 									      \
54 	__ret;								      \
55 })
56 
57 #define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk, skb)			       \
58 ({									       \
59 	int __ret = 0;							       \
60 	if (cgroup_bpf_enabled && sk && sk == skb->sk) {		       \
61 		typeof(sk) __sk = sk_to_full_sk(sk);			       \
62 		if (sk_fullsock(__sk))					       \
63 			__ret = __cgroup_bpf_run_filter_skb(__sk, skb,	       \
64 						      BPF_CGROUP_INET_EGRESS); \
65 	}								       \
66 	__ret;								       \
67 })
68 
69 #define BPF_CGROUP_RUN_PROG_INET_SOCK(sk)				       \
70 ({									       \
71 	int __ret = 0;							       \
72 	if (cgroup_bpf_enabled && sk) {					       \
73 		__ret = __cgroup_bpf_run_filter_sk(sk,			       \
74 						 BPF_CGROUP_INET_SOCK_CREATE); \
75 	}								       \
76 	__ret;								       \
77 })
78 
79 #else
80 
81 struct cgroup_bpf {};
82 static inline void cgroup_bpf_put(struct cgroup *cgrp) {}
83 static inline void cgroup_bpf_inherit(struct cgroup *cgrp,
84 				      struct cgroup *parent) {}
85 
86 #define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk,skb) ({ 0; })
87 #define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk,skb) ({ 0; })
88 #define BPF_CGROUP_RUN_PROG_INET_SOCK(sk) ({ 0; })
89 
90 #endif /* CONFIG_CGROUP_BPF */
91 
92 #endif /* _BPF_CGROUP_H */
93