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KFunc bpf_dynptr_slice_rdwr

v6.4

Get a pointer to dynptr data up to len bytes for read write access.

Definition

If the dynptr doesn't have continuous data up to len bytes, or the dynptr is read only, return NULL.

Signature

void *bpf_dynptr_slice_rdwr(const struct bpf_dynptr *p, u64 offset, void *buffer__opt, u64 buffer__szk)

Note

The pointer returned by the kfunc may be NULL. Hence, it forces the user to do a NULL check on the pointer returned from the kfunc before making use of it (dereferencing or passing to another helper).

Note

In v6.19 the signature of this kfunc changed from u32 to u64 types for offset. This may require CO-RE logic to select the correct kfunc.

Usage

Docs could be improved

This part of the docs is incomplete, contributions are very welcome

Program types

The following program types can make use of this kfunc:

Example

Docs could be improved

This part of the docs is incomplete, contributions are very welcome