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

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Joanne Koong 2022-05-23 14:07:10 -07:00 • committed by Andrii Nakryiko

parent bc34dee65a

commit 13bbbfbea7

3 changed files with 116 additions and 0 deletions

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tools/include/uapi/linux/bpf.h

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