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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 Alexei Starovoitov
parent bffcf34878
commit a4b2f3cf69
3 changed files with 47 additions and 7 deletions
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38
tools/lib/bpf/bpf.c
View File

@ -795,24 +795,48 @@ int bpf_iter_create(int link_fd)
return libbpf_err_errno(fd);
}
int bpf_prog_query(int target_fd, enum bpf_attach_type type, __u32 query_flags,
__u32 *attach_flags, __u32 *prog_ids, __u32 *prog_cnt)
int bpf_prog_query_opts(int target_fd,
enum bpf_attach_type type,
struct bpf_prog_query_opts *opts)
{
union bpf_attr attr;
int ret;
if (!OPTS_VALID(opts, bpf_prog_query_opts))
return libbpf_err(-EINVAL);
memset(&attr, 0, sizeof(attr));
attr.query.target_fd = target_fd;
attr.query.attach_type = type;
attr.query.query_flags = query_flags;
attr.query.prog_cnt = *prog_cnt;
attr.query.prog_ids = ptr_to_u64(prog_ids);
attr.query.query_flags = OPTS_GET(opts, query_flags, 0);
attr.query.prog_cnt = OPTS_GET(opts, prog_cnt, 0);
attr.query.prog_ids = ptr_to_u64(OPTS_GET(opts, prog_ids, NULL));
attr.query.prog_attach_flags = ptr_to_u64(OPTS_GET(opts, prog_attach_flags, NULL));
ret = sys_bpf(BPF_PROG_QUERY, &attr, sizeof(attr));
OPTS_SET(opts, attach_flags, attr.query.attach_flags);
OPTS_SET(opts, prog_cnt, attr.query.prog_cnt);
return libbpf_err_errno(ret);
}
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_OPTS(bpf_prog_query_opts, opts);
int ret;
opts.query_flags = query_flags;
opts.prog_ids = prog_ids;
opts.prog_cnt = *prog_cnt;
ret = bpf_prog_query_opts(target_fd, type, &opts);
if (attach_flags)
*attach_flags = attr.query.attach_flags;
*prog_cnt = attr.query.prog_cnt;
*attach_flags = opts.attach_flags;
*prog_cnt = opts.prog_cnt;
return libbpf_err_errno(ret);
}

15
tools/lib/bpf/bpf.h
View File

@ -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,

1
tools/lib/bpf/libbpf.map
View File

@ -355,6 +355,7 @@ LIBBPF_0.8.0 {
LIBBPF_1.0.0 {
global:
bpf_prog_query_opts;
btf__add_enum64;
btf__add_enum64_value;
libbpf_bpf_attach_type_str;