summaryrefslogtreecommitdiffstats
path: root/tools/include/uapi
diff options
context:
space:
mode:
authorJoanne Koong <joannelkoong@gmail.com>2022-05-23 14:07:10 -0700
committerAndrii Nakryiko <andrii@kernel.org>2022-05-23 14:31:28 -0700
commit13bbbfbea7598ea9f8d9c3d73bf053bb57f9c4b2 (patch)
tree418774726bb3e4a88cd5ce4b75f5360e73d90b9f /tools/include/uapi
parentbc34dee65a65e9c920c420005b8a43f2a721a458 (diff)
downloadlinux-stable-13bbbfbea7598ea9f8d9c3d73bf053bb57f9c4b2.tar.gz
linux-stable-13bbbfbea7598ea9f8d9c3d73bf053bb57f9c4b2.tar.bz2
linux-stable-13bbbfbea7598ea9f8d9c3d73bf053bb57f9c4b2.zip
bpf: Add bpf_dynptr_read and bpf_dynptr_write
This patch adds two helper functions, bpf_dynptr_read and bpf_dynptr_write: long bpf_dynptr_read(void *dst, u32 len, struct bpf_dynptr *src, u32 offset); long bpf_dynptr_write(struct bpf_dynptr *dst, u32 offset, void *src, u32 len); The dynptr passed into these functions must be valid dynptrs that have been initialized. Signed-off-by: Joanne Koong <joannelkoong@gmail.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20220523210712.3641569-5-joannelkoong@gmail.com
Diffstat (limited to 'tools/include/uapi')
-rw-r--r--tools/include/uapi/linux/bpf.h19
1 files changed, 19 insertions, 0 deletions
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index 081a55540aa5..efe2505650e6 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -5221,6 +5221,23 @@ union bpf_attr {
* 'bpf_ringbuf_discard'.
* Return
* Nothing. Always succeeds.
+ *
+ * long bpf_dynptr_read(void *dst, u32 len, struct bpf_dynptr *src, u32 offset)
+ * Description
+ * Read *len* bytes from *src* into *dst*, starting from *offset*
+ * into *src*.
+ * Return
+ * 0 on success, -E2BIG if *offset* + *len* exceeds the length
+ * of *src*'s data, -EINVAL if *src* is an invalid dynptr.
+ *
+ * long bpf_dynptr_write(struct bpf_dynptr *dst, u32 offset, void *src, u32 len)
+ * Description
+ * Write *len* bytes from *src* into *dst*, starting from *offset*
+ * into *dst*.
+ * Return
+ * 0 on success, -E2BIG if *offset* + *len* exceeds the length
+ * of *dst*'s data, -EINVAL if *dst* is an invalid dynptr or if *dst*
+ * is a read-only dynptr.
*/
#define __BPF_FUNC_MAPPER(FN) \
FN(unspec), \
@@ -5424,6 +5441,8 @@ union bpf_attr {
FN(ringbuf_reserve_dynptr), \
FN(ringbuf_submit_dynptr), \
FN(ringbuf_discard_dynptr), \
+ FN(dynptr_read), \
+ FN(dynptr_write), \
/* */
/* integer value in 'imm' field of BPF_CALL instruction selects which helper