Helper function bpf_skb_get_tunnel_opt
Definition
Copyright (c) 2015 The Libbpf Authors. All rights reserved.
Retrieve tunnel options metadata for the packet associated to skb, and store the raw tunnel option data to the buffer opt of size.
This helper can be used with encapsulation devices that can operate in "collect metadata" mode (please refer to the related note in the description of bpf_skb_get_tunnel_key() for more details). A particular example where this can be used is in combination with the Geneve encapsulation protocol, where it allows for pushing (with bpf_skb_get_tunnel_opt() helper) and retrieving arbitrary TLVs (Type-Length-Value headers) from the eBPF program. This allows for full customization of these headers.
Returns
The size of the option data retrieved.
static long (* const bpf_skb_get_tunnel_opt)(struct __sk_buff *skb, void *opt, __u32 size) = (void *) 29;
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