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bpf: Add bpf_dynptr_read and bpf_dynptr_write

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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
This commit is contained in:
Joanne Koong
2022-05-23 14:07:10 -07:00
committed by Andrii Nakryiko
parent 1a0f5d1c87
commit 7ed5bf8f4c
1 changed files with 19 additions and 0 deletions
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19
include/uapi/linux/bpf.h
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@@ -5221,6 +5221,23 @@ union bpf_attr {
* 'bpf_ringbuf_discard'. * 'bpf_ringbuf_discard'.
* Return * Return
* Nothing. Always succeeds. * 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) \ #define __BPF_FUNC_MAPPER(FN) \
FN(unspec), \ FN(unspec), \
@@ -5424,6 +5441,8 @@ union bpf_attr {
FN(ringbuf_reserve_dynptr), \ FN(ringbuf_reserve_dynptr), \
FN(ringbuf_submit_dynptr), \ FN(ringbuf_submit_dynptr), \
FN(ringbuf_discard_dynptr), \ FN(ringbuf_discard_dynptr), \
FN(dynptr_read), \
FN(dynptr_write), \
/* */ /* */
/* integer value in 'imm' field of BPF_CALL instruction selects which helper /* integer value in 'imm' field of BPF_CALL instruction selects which helper