Commit 639ecd7d authored by Andrii Nakryiko's avatar Andrii Nakryiko Committed by Alexei Starovoitov
Browse files

libbpf: Add bpf_token_create() API 



Add low-level wrapper API for BPF_TOKEN_CREATE command in bpf() syscall.

Signed-off-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20240124022127.2379740-13-andrii@kernel.org
parent f568a3d4

tools/lib/bpf/bpf.c

+17 −0
Original line number Diff line number Diff line
@@ -1289,3 +1289,20 @@ int bpf_prog_bind_map(int prog_fd, int map_fd, 
	ret = sys_bpf(BPF_PROG_BIND_MAP, &attr, attr_sz);

	return libbpf_err_errno(ret);

}



int bpf_token_create(int bpffs_fd, struct bpf_token_create_opts *opts)

{

	const size_t attr_sz = offsetofend(union bpf_attr, token_create);

	union bpf_attr attr;

	int fd;



	if (!OPTS_VALID(opts, bpf_token_create_opts))

		return libbpf_err(-EINVAL);



	memset(&attr, 0, attr_sz);

	attr.token_create.bpffs_fd = bpffs_fd;

	attr.token_create.flags = OPTS_GET(opts, flags, 0);



	fd = sys_bpf_fd(BPF_TOKEN_CREATE, &attr, attr_sz);

	return libbpf_err_errno(fd);

}

tools/lib/bpf/bpf.h

+24 −0
Original line number Diff line number Diff line
@@ -642,6 +642,30 @@ struct bpf_test_run_opts { 
LIBBPF_API int bpf_prog_test_run_opts(int prog_fd,

				      struct bpf_test_run_opts *opts);



struct bpf_token_create_opts {

	size_t sz; /* size of this struct for forward/backward compatibility */

	__u32 flags;

	size_t :0;

};

#define bpf_token_create_opts__last_field flags



/**

 * @brief **bpf_token_create()** creates a new instance of BPF token derived

 * from specified BPF FS mount point.

 *

 * BPF token created with this API can be passed to bpf() syscall for

 * commands like BPF_PROG_LOAD, BPF_MAP_CREATE, etc.

 *

 * @param bpffs_fd FD for BPF FS instance from which to derive a BPF token

 * instance.

 * @param opts optional BPF token creation options, can be NULL

 *

 * @return BPF token FD > 0, on success; negative error code, otherwise (errno

 * is also set to the error code)

 */

LIBBPF_API int bpf_token_create(int bpffs_fd,

				struct bpf_token_create_opts *opts);



#ifdef __cplusplus

} /* extern "C" */

#endif

tools/lib/bpf/libbpf.map

+1 −0
Original line number Diff line number Diff line
@@ -411,4 +411,5 @@ LIBBPF_1.3.0 { 
} LIBBPF_1.2.0;



LIBBPF_1.4.0 {

		bpf_token_create;

} LIBBPF_1.3.0;