Re: [PATCH v10 net-next 2/2] net: filter: split filter.h and expose eBPF to user space

On Thu, Sep 04, 2014 at 10:17:18PM -0700, Alexei Starovoitov wrote:

allow user space to generate eBPF programs

uapi/linux/bpf.h: eBPF instruction set definition

linux/filter.h: the rest

This patch only moves macro definitions, but practically it freezes existing
eBPF instruction set, though new instructions can still be added in the future.

These eBPF definitions cannot go into uapi/linux/filter.h, since the names
may conflict with existing applications.

Full eBPF ISA description is in Documentation/networking/filter.txt

I think you need to have at least one single interface using this
before you can expose it to userspace. So this should come in the
small batch that introduces the first interface of your ebpf code in
userspace. AFAIK, this has been the policy so far.