From: Simon Horman <simon.hor...@netronome.com> Date: Wed, 27 Sep 2017 10:16:32 +0200
> Users of options: > > * There are eBPF hooks to allow getting on and setting tunnel metadata: > bpf_skb_set_tunnel_opt, bpf_skb_get_tunnel_opt. > > * Open vSwitch is able to match and set Geneve and VXLAN-GBP options. > > Neither of the above appear to assume any structure for the data. I really worry about this. These metadata option blobs are internal kernel datastructure which we could change at any point in time. They are not exported to userspace as a UAPI. It's kinda OK for eBPF programs to access this stuff since they are expected to cope with changes to internal data-structures. But for anything user facing, this really doesn't work.
