Helper function bpf_msg_push_data
Definition
Copyright (c) 2015 The Libbpf Authors. All rights reserved.
For socket policies, insert len bytes into msg at offset start.
If a program of type BPF_PROG_TYPE_SK_MSG is run on a msg it may want to insert metadata or options into the msg. This can later be read and used by any of the lower layer BPF hooks.
This helper may fail if under memory pressure (a malloc fails) in these cases BPF programs will get an appropriate error and BPF programs will need to handle them.
Returns
0 on success, or a negative error in case of failure.
static long (* const bpf_msg_push_data)(struct sk_msg_md *msg, __u32 start, __u32 len, __u64 flags) = (void *) 90;
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