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Helper function bpf_dynptr_write

v5.19

Definition

Copyright (c) 2015 The Libbpf Authors. All rights reserved.

Write len bytes from src into dst, starting from offset into dst.

flags must be 0 except for skb-type dynptrs.

For skb-type dynptrs: _ All data slices of the dynptr are automatically invalidated after bpf_dynptr_write(). This is because writing may pull the skb and change the underlying packet buffer.

_  For _flags_, please see the flags accepted by        **bpf_skb_store_bytes**().

Returns

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 or if flags is not correct. For skb-type dynptrs, other errors correspond to errors returned by bpf_skb_store_bytes().

static long (* const bpf_dynptr_write)(const struct bpf_dynptr *dst, __u32 offset, void *src, __u32 len, __u64 flags) = (void *) 202;

Usage

Docs could be improved

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

Program types

This helper call can be used in the following program types:

Example

Docs could be improved

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