[mirror_ubuntu-artful-kernel.git] / include / linux / bpf-cgroup.h

#ifndef _BPF_CGROUP_H
#define _BPF_CGROUP_H

#include <linux/jump_label.h>
#include <uapi/linux/bpf.h>

struct sock;
struct cgroup;
struct sk_buff;
struct bpf_sock_ops_kern;

#ifdef CONFIG_CGROUP_BPF

extern struct static_key_false cgroup_bpf_enabled_key;
#define cgroup_bpf_enabled static_branch_unlikely(&cgroup_bpf_enabled_key)

struct cgroup_bpf {
	/*
	 * Store two sets of bpf_prog pointers, one for programs that are
	 * pinned directly to this cgroup, and one for those that are effective
	 * when this cgroup is accessed.
	 */
	struct bpf_prog *prog[MAX_BPF_ATTACH_TYPE];
	struct bpf_prog __rcu *effective[MAX_BPF_ATTACH_TYPE];
	bool disallow_override[MAX_BPF_ATTACH_TYPE];
};

void cgroup_bpf_put(struct cgroup *cgrp);
void cgroup_bpf_inherit(struct cgroup *cgrp, struct cgroup *parent);

int __cgroup_bpf_update(struct cgroup *cgrp, struct cgroup *parent,
			struct bpf_prog *prog, enum bpf_attach_type type,
			bool overridable);

/* Wrapper for __cgroup_bpf_update() protected by cgroup_mutex */
int cgroup_bpf_update(struct cgroup *cgrp, struct bpf_prog *prog,
		      enum bpf_attach_type type, bool overridable);

int __cgroup_bpf_run_filter_skb(struct sock *sk,
				struct sk_buff *skb,
				enum bpf_attach_type type);

int __cgroup_bpf_run_filter_sk(struct sock *sk,
			       enum bpf_attach_type type);

int __cgroup_bpf_run_filter_sock_ops(struct sock *sk,
				     struct bpf_sock_ops_kern *sock_ops,
				     enum bpf_attach_type type);

/* Wrappers for __cgroup_bpf_run_filter_skb() guarded by cgroup_bpf_enabled. */
#define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb)			      \
({									      \
	int __ret = 0;							      \
	if (cgroup_bpf_enabled)						      \
		__ret = __cgroup_bpf_run_filter_skb(sk, skb,		      \
						    BPF_CGROUP_INET_INGRESS); \
									      \
	__ret;								      \
})

#define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk, skb)			       \
({									       \
	int __ret = 0;							       \
	if (cgroup_bpf_enabled && sk && sk == skb->sk) {		       \
		typeof(sk) __sk = sk_to_full_sk(sk);			       \
		if (sk_fullsock(__sk))					       \
			__ret = __cgroup_bpf_run_filter_skb(__sk, skb,	       \
						      BPF_CGROUP_INET_EGRESS); \
	}								       \
	__ret;								       \
})

#define BPF_CGROUP_RUN_PROG_INET_SOCK(sk)				       \
({									       \
	int __ret = 0;							       \
	if (cgroup_bpf_enabled && sk) {					       \
		__ret = __cgroup_bpf_run_filter_sk(sk,			       \
						 BPF_CGROUP_INET_SOCK_CREATE); \
	}								       \
	__ret;								       \
})

#define BPF_CGROUP_RUN_PROG_SOCK_OPS(sock_ops)				       \
({									       \
	int __ret = 0;							       \
	if (cgroup_bpf_enabled && (sock_ops)->sk) {	       \
		typeof(sk) __sk = sk_to_full_sk((sock_ops)->sk);	       \
		if (__sk && sk_fullsock(__sk))				       \
			__ret = __cgroup_bpf_run_filter_sock_ops(__sk,	       \
								 sock_ops,     \
							 BPF_CGROUP_SOCK_OPS); \
	}								       \
	__ret;								       \
})
#else

struct cgroup_bpf {};
static inline void cgroup_bpf_put(struct cgroup *cgrp) {}
static inline void cgroup_bpf_inherit(struct cgroup *cgrp,
				      struct cgroup *parent) {}

#define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk,skb) ({ 0; })
#define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk,skb) ({ 0; })
#define BPF_CGROUP_RUN_PROG_INET_SOCK(sk) ({ 0; })
#define BPF_CGROUP_RUN_PROG_SOCK_OPS(sock_ops) ({ 0; })

#endif /* CONFIG_CGROUP_BPF */

#endif /* _BPF_CGROUP_H */
Commit	Line	Data
30070984 DM	1	#ifndef _BPF_CGROUP_H
	2	#define _BPF_CGROUP_H
	3
30070984 DM	4	#include <linux/jump_label.h>
	5	#include <uapi/linux/bpf.h>
	6
	7	struct sock;
	8	struct cgroup;
	9	struct sk_buff;
40304b2a	10	struct bpf_sock_ops_kern;
30070984 DM	11
	12	#ifdef CONFIG_CGROUP_BPF
	13
	14	extern struct static_key_false cgroup_bpf_enabled_key;
	15	#define cgroup_bpf_enabled static_branch_unlikely(&cgroup_bpf_enabled_key)
	16
	17	struct cgroup_bpf {
	18	/*
	19	* Store two sets of bpf_prog pointers, one for programs that are
	20	* pinned directly to this cgroup, and one for those that are effective
	21	* when this cgroup is accessed.
	22	*/
	23	struct bpf_prog *prog[MAX_BPF_ATTACH_TYPE];
dcdc43d6	24	struct bpf_prog __rcu *effective[MAX_BPF_ATTACH_TYPE];
7f677633	25	bool disallow_override[MAX_BPF_ATTACH_TYPE];
30070984 DM	26	};
	27
	28	void cgroup_bpf_put(struct cgroup *cgrp);
	29	void cgroup_bpf_inherit(struct cgroup cgrp, struct cgroup parent);
	30
7f677633 AS	31	int __cgroup_bpf_update(struct cgroup cgrp, struct cgroup parent,
	32	struct bpf_prog *prog, enum bpf_attach_type type,
	33	bool overridable);
30070984 DM	34
30070984 DM	35	/* Wrapper for __cgroup_bpf_update() protected by cgroup_mutex */
7f677633 AS	36	int cgroup_bpf_update(struct cgroup cgrp, struct bpf_prog prog,
7f677633 AS	37	enum bpf_attach_type type, bool overridable);
30070984	38
b2cd1257 DA	39	int __cgroup_bpf_run_filter_skb(struct sock *sk,
	40	struct sk_buff *skb,
	41	enum bpf_attach_type type);
	42
61023658 DA	43	int __cgroup_bpf_run_filter_sk(struct sock *sk,
	44	enum bpf_attach_type type);
	45
40304b2a LB	46	int __cgroup_bpf_run_filter_sock_ops(struct sock *sk,
	47	struct bpf_sock_ops_kern *sock_ops,
	48	enum bpf_attach_type type);
	49
b2cd1257 DA	50	/* Wrappers for __cgroup_bpf_run_filter_skb() guarded by cgroup_bpf_enabled. */
	51	#define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb) \
	52	({ \
	53	int __ret = 0; \
	54	if (cgroup_bpf_enabled) \
	55	__ret = __cgroup_bpf_run_filter_skb(sk, skb, \
	56	BPF_CGROUP_INET_INGRESS); \
	57	\
	58	__ret; \
30070984 DM	59	})
30070984 DM	60
b2cd1257 DA	61	#define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk, skb) \
	62	({ \
	63	int __ret = 0; \
	64	if (cgroup_bpf_enabled && sk && sk == skb->sk) { \
	65	typeof(sk) __sk = sk_to_full_sk(sk); \
	66	if (sk_fullsock(__sk)) \
	67	__ret = __cgroup_bpf_run_filter_skb(__sk, skb, \
	68	BPF_CGROUP_INET_EGRESS); \
	69	} \
	70	__ret; \
30070984 DM	71	})
30070984 DM	72
61023658 DA	73	#define BPF_CGROUP_RUN_PROG_INET_SOCK(sk) \
	74	({ \
	75	int __ret = 0; \
	76	if (cgroup_bpf_enabled && sk) { \
	77	__ret = __cgroup_bpf_run_filter_sk(sk, \
	78	BPF_CGROUP_INET_SOCK_CREATE); \
	79	} \
	80	__ret; \
	81	})
	82
40304b2a LB	83	#define BPF_CGROUP_RUN_PROG_SOCK_OPS(sock_ops) \
	84	({ \
	85	int __ret = 0; \
	86	if (cgroup_bpf_enabled && (sock_ops)->sk) { \
	87	typeof(sk) __sk = sk_to_full_sk((sock_ops)->sk); \
df39a9f1	88	if (__sk && sk_fullsock(__sk)) \
40304b2a LB	89	__ret = __cgroup_bpf_run_filter_sock_ops(__sk, \
	90	sock_ops, \
	91	BPF_CGROUP_SOCK_OPS); \
	92	} \
	93	__ret; \
	94	})
30070984 DM	95	#else
	96
	97	struct cgroup_bpf {};
	98	static inline void cgroup_bpf_put(struct cgroup *cgrp) {}
	99	static inline void cgroup_bpf_inherit(struct cgroup *cgrp,
	100	struct cgroup *parent) {}
	101
	102	#define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk,skb) ({ 0; })
	103	#define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk,skb) ({ 0; })
61023658	104	#define BPF_CGROUP_RUN_PROG_INET_SOCK(sk) ({ 0; })
40304b2a	105	#define BPF_CGROUP_RUN_PROG_SOCK_OPS(sock_ops) ({ 0; })
30070984 DM	106
	107	#endif /* CONFIG_CGROUP_BPF */
	108
	109	#endif /* _BPF_CGROUP_H */