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Message-Id: <20220518225531.558008-8-sdf@google.com>
Date: Wed, 18 May 2022 15:55:27 -0700
From: Stanislav Fomichev <sdf@...gle.com>
To: netdev@...r.kernel.org, bpf@...r.kernel.org
Cc: ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
Stanislav Fomichev <sdf@...gle.com>
Subject: [PATCH bpf-next v7 07/11] libbpf: implement bpf_prog_query_opts
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
Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
---
tools/include/uapi/linux/bpf.h | 5 ++++
tools/lib/bpf/bpf.c | 42 +++++++++++++++++++++++++++-------
tools/lib/bpf/bpf.h | 15 ++++++++++++
tools/lib/bpf/libbpf.map | 1 +
4 files changed, 55 insertions(+), 8 deletions(-)
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index b9d2d6de63a7..432fc5f49567 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -1432,6 +1432,7 @@ union bpf_attr {
__u32 attach_flags;
__aligned_u64 prog_ids;
__u32 prog_cnt;
+ __aligned_u64 prog_attach_flags; /* output: per-program attach_flags */
} query;
struct { /* anonymous struct used by BPF_RAW_TRACEPOINT_OPEN command */
@@ -5911,6 +5912,10 @@ struct bpf_prog_info {
__u64 run_cnt;
__u64 recursion_misses;
__u32 verified_insns;
+ /* BTF ID of the function to attach to within BTF object identified
+ * by btf_id.
+ */
+ __u32 attach_btf_func_id;
} __attribute__((aligned(8)));
struct bpf_map_info {
diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
index 4677644d80f4..f0c2c2ea5a93 100644
--- a/tools/lib/bpf/bpf.c
+++ b/tools/lib/bpf/bpf.c
@@ -968,28 +968,54 @@ 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;
memset(&attr, 0, sizeof(attr));
+
+ if (!OPTS_VALID(opts, bpf_prog_query_opts))
+ return libbpf_err(-EINVAL);
+
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));
- if (attach_flags)
- *attach_flags = attr.query.attach_flags;
- *prog_cnt = attr.query.prog_cnt;
+ if (OPTS_HAS(opts, prog_cnt))
+ opts->prog_cnt = attr.query.prog_cnt;
+ if (OPTS_HAS(opts, attach_flags))
+ opts->attach_flags = attr.query.attach_flags;
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, p);
+ int ret;
+
+ p.query_flags = query_flags;
+ p.prog_ids = prog_ids;
+ p.prog_cnt = *prog_cnt;
+
+ ret = bpf_prog_query_opts(target_fd, type, &p);
+
+ if (attach_flags)
+ *attach_flags = p.attach_flags;
+ *prog_cnt = p.prog_cnt;
+
+ return ret;
+}
+
int bpf_prog_test_run(int prog_fd, int repeat, void *data, __u32 size,
void *data_out, __u32 *size_out, __u32 *retval,
__u32 *duration)
diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h
index 2e0d3731e4c0..11ffbed99637 100644
--- a/tools/lib/bpf/bpf.h
+++ b/tools/lib/bpf/bpf.h
@@ -484,9 +484,24 @@ 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,
diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
index 6b36f46ab5d8..24f7a5147bf2 100644
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -452,6 +452,7 @@ LIBBPF_0.8.0 {
bpf_map_delete_elem_flags;
bpf_object__destroy_subskeleton;
bpf_object__open_subskeleton;
+ bpf_prog_query_opts;
bpf_program__attach_kprobe_multi_opts;
bpf_program__attach_trace_opts;
bpf_program__attach_usdt;
--
2.36.1.124.g0e6072fb45-goog
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