Commit 6cc7d1e8 authored by Andrii Nakryiko's avatar Andrii Nakryiko Committed by Alexei Starovoitov
Browse files

bpf: Make bpf_link API available indepently of CONFIG_BPF_SYSCALL 



Similarly to bpf_prog, make bpf_link and related generic API available
unconditionally to make it easier to have bpf_link support in various parts of
the kernel. Stub out init/prime/settle/cleanup and inc/put APIs.

Reported-by: default avatarkernel test robot <lkp@intel.com>
Signed-off-by: default avatarAndrii Nakryiko <andriin@fb.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200722064603.3350758-2-andriin@fb.com
parent 2b9b305f

include/linux/bpf.h

+55 −26
Original line number Diff line number Diff line
@@ -781,6 +781,32 @@ struct bpf_array_aux { 
	struct work_struct work;

};



struct bpf_link {

	atomic64_t refcnt;

	u32 id;

	enum bpf_link_type type;

	const struct bpf_link_ops *ops;

	struct bpf_prog *prog;

	struct work_struct work;

};



struct bpf_link_ops {

	void (*release)(struct bpf_link *link);

	void (*dealloc)(struct bpf_link *link);

	int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog,

			   struct bpf_prog *old_prog);

	void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq);

	int (*fill_link_info)(const struct bpf_link *link,

			      struct bpf_link_info *info);

};



struct bpf_link_primer {

	struct bpf_link *link;

	struct file *file;

	int fd;

	u32 id;

};



struct bpf_struct_ops_value;

struct btf_type;

struct btf_member;
@@ -1164,32 +1190,6 @@ static inline bool bpf_bypass_spec_v4(void) 
int bpf_map_new_fd(struct bpf_map *map, int flags);

int bpf_prog_new_fd(struct bpf_prog *prog);



struct bpf_link {

	atomic64_t refcnt;

	u32 id;

	enum bpf_link_type type;

	const struct bpf_link_ops *ops;

	struct bpf_prog *prog;

	struct work_struct work;

};



struct bpf_link_primer {

	struct bpf_link *link;

	struct file *file;

	int fd;

	u32 id;

};



struct bpf_link_ops {

	void (*release)(struct bpf_link *link);

	void (*dealloc)(struct bpf_link *link);

	int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog,

			   struct bpf_prog *old_prog);

	void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq);

	int (*fill_link_info)(const struct bpf_link *link,

			      struct bpf_link_info *info);

};



void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,

		   const struct bpf_link_ops *ops, struct bpf_prog *prog);

int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer);
@@ -1401,6 +1401,35 @@ static inline void __bpf_prog_uncharge(struct user_struct *user, u32 pages) 
{

}



static inline void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,

				 const struct bpf_link_ops *ops,

				 struct bpf_prog *prog)

{

}



static inline int bpf_link_prime(struct bpf_link *link,

				 struct bpf_link_primer *primer)

{

	return -EOPNOTSUPP;

}



static inline int bpf_link_settle(struct bpf_link_primer *primer)

{

	return -EOPNOTSUPP;

}



static inline void bpf_link_cleanup(struct bpf_link_primer *primer)

{

}



static inline void bpf_link_inc(struct bpf_link *link)

{

}



static inline void bpf_link_put(struct bpf_link *link)

{

}



static inline int bpf_obj_get_user(const char __user *pathname, int flags)

{

	return -EOPNOTSUPP;