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libbpf: implement bpf_prog_query_opts

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Implement bpf_prog_query_opts as a more expendable version of
bpf_prog_query. Expose new prog_attach_flags and attach_btf_func_id as
well:

* prog_attach_flags is a per-program attach_type; relevant only for
  lsm cgroup program which might have different attach_flags
  per attach_btf_id
* attach_btf_func_id is a new field expose for prog_query which
  specifies real btf function id for lsm cgroup attachments

Acked-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/r/20220628174314.1216643-10-sdf@google.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Stanislav Fomichev
2022-06-28 10:43:12 -07:00
committed by Andrii Nakryiko
parent f9f7f2d30a
commit 812a95fdf7
3 changed files with 47 additions and 7 deletions
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15
src/bpf.h
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@@ -359,9 +359,24 @@ LIBBPF_API int bpf_map_get_fd_by_id(__u32 id);
LIBBPF_API int bpf_btf_get_fd_by_id(__u32 id);
LIBBPF_API int bpf_link_get_fd_by_id(__u32 id);
LIBBPF_API int bpf_obj_get_info_by_fd(int bpf_fd, void *info, __u32 *info_len);
struct bpf_prog_query_opts {
size_t sz; /* size of this struct for forward/backward compatibility */
__u32 query_flags;
__u32 attach_flags; /* output argument */
__u32 *prog_ids;
__u32 prog_cnt; /* input+output argument */
__u32 *prog_attach_flags;
};
#define bpf_prog_query_opts__last_field prog_attach_flags
LIBBPF_API int bpf_prog_query_opts(int target_fd,
enum bpf_attach_type type,
struct bpf_prog_query_opts *opts);
LIBBPF_API int bpf_prog_query(int target_fd, enum bpf_attach_type type,
__u32 query_flags, __u32 *attach_flags,
__u32 *prog_ids, __u32 *prog_cnt);
LIBBPF_API int bpf_raw_tracepoint_open(const char *name, int prog_fd);
LIBBPF_API int bpf_task_fd_query(int pid, int fd, __u32 flags, char *buf,
__u32 *buf_len, __u32 *prog_id, __u32 *fd_type,