From: Hou Tao <houtao1@xxxxxxxxxx>
Add bpf_dynptr_user_init() to initialize a bpf_dynptr,
bpf_dynptr_user_get_{data,size}() to get the address and length of
dynptr, and bpf_dynptr_user_trim() to trim size of dynptr.
Instead of exporting these symbols, simply adding these helpers as
inline functions in bpf.h.
Signed-off-by: Hou Tao <houtao1@xxxxxxxxxx>
---
tools/lib/bpf/bpf.h | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h
index 9c50beabdd14..6b91a8c2b2ae 100644
--- a/tools/lib/bpf/bpf.h
+++ b/tools/lib/bpf/bpf.h
@@ -371,6 +371,35 @@ 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);
+/* sys_bpf() will check the validity of size */
+static inline void bpf_dynptr_user_init(void *data, __u32 size,
+ struct bpf_dynptr_user *dynptr)
+{
+ /* Zero padding bytes */
+ memset(dynptr, 0, sizeof(*dynptr));
+ dynptr->data = (__u64)(unsigned long)data;
+ dynptr->size = size;
+}
+
+static inline __u32
+bpf_dynptr_user_get_size(const struct bpf_dynptr_user *dynptr)
+{
+ return dynptr->size;
+}
+
+static inline void *
+bpf_dynptr_user_get_data(const struct bpf_dynptr_user *dynptr)
+{
+ return (void *)(unsigned long)dynptr->data;
+}
+
+static inline void bpf_dynptr_user_trim(struct bpf_dynptr_user *dynptr,
+ __u32 new_size)
+{
+ if (new_size < dynptr->size)
+ dynptr->size = new_size;
+}
+
struct bpf_prog_query_opts {
size_t sz; /* size of this struct for forward/backward compatibility */
__u32 query_flags;
--
2.29.2
